JPH01192504A - Sealing method of end surface of honeycomb-like molded body - Google Patents

Abstract

PURPOSE:To seal an end surface reliably and enable, moreover, the present method to perform its operation easily, by a method wherein pressing-in of a thin film molded body having plasticity is performed as a plug material through a masking material comprised of an elastic body. CONSTITUTION:An end surface 11a of a through hole becoming an opening part is clogged with a masking material 2 comprised of an elastic body. Then the whole of the end surface of a honeycomb-like molded body is coated with a thin film molded body 3 having plasticity, pressurized on the top by making use of a pressurizing fittings 4, the masking material 2 is depressed into the through hole 11a along with a thin film molded body 3b and a part 3a of the thin film molded body 3 is pressed temporarily into the end surface 11b of the through hole becoming a sealing part. After the thin film molded body 3b of a part which has been kept coated the masking material 2 is removed along with the masking material 2, the whole of the end surface of the honeycomb-like molded body is pressurized directly by making use of the pressurizing fittings so that the same becomes a plane. The thin film molded bond 3a which has been kept pressed in temporarily is pressed completely in the end surface 11b of the through hole for formation of the sealing part.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for sealing the end face of a honeycomb-shaped molded body, and more specifically, to a method for easily and reliably sealing the end face using a thin film molded body having plasticity. The present invention relates to a sealing method capable of sealing.

(Prior art) One end surface of the through-holes of a honeycomb-shaped body having a large number of through-holes with square or triangular cross-sections connected in a honeycomb-like manner through thin porous partition walls is plugged, for example, in every vertical and horizontal direction. A honeycomb filter is made of a sintered body, which is filled with a plug material and sealed, and the other end of the through hole adjacent to the sealed through hole is filled with a plug material and sealed. It is known as an exhaust gas purification device that collects, filters, and removes particulate carbon contained in the exhaust gas of various combustion equipment.

Such honeycomb filters are made of cordierite.

Clay or an organic binder is added to fine powder of oxides such as alumina, carbides and nitrides such as silicon carbide and silicon nitride, and then a honeycomb-shaped molded product is formed by conventional methods such as extrusion molding and pipe binding. Next, both end faces of the honeycomb-shaped molded body are sealed, for example, in every row and column to form a so-called checkered pattern, and then fired and molded under predetermined conditions.

Among these, the conventional method of sealing the end faces of a honeycomb-shaped body, for example, every other side, is to attach a film impregnated with adhesive resin to one side of the honeycomb-shaped body, and then Holes are made in the film with a needle in line with the through-holes to be sealed in a checkered pattern, and the end face of the honeycomb-shaped molded body with the holes is immersed in a container containing slurry-like plugging material and vibrated with a vibrator. A method in which a step of introducing plugging material into the through-hole is performed on both end faces, and the film is peeled off after the plugging material is cured under predetermined conditions;
Alternatively, one end surface of the honeycomb-shaped molded body is immersed in a slurry to seal the entire end surface, and then compressed air is fed into the vertical and horizontal through holes from the other end surface to form a sealing portion on the one end surface. Then, after covering the entire other end surface with a thin film, compressed air is sent from the entire one end surface to open the thin film on the other end surface of the through hole opened at one end surface, and the other end surface is covered in the same manner as above. There is a method in which the thin film is immersed in a slurry, the other end of the through hole opened by compressed air is sealed, and then fired.

(Problem to be Solved by the Invention) However, in all of the above-mentioned conventional methods, when a slurry plug material is introduced into the through hole to be sealed, the thickness of the plug material differs for each through hole. Therefore, especially when the thickness of the plug material is thin, the strength of the honeycomb-shaped molded body after forming the sealing part will be poor, and the heat resistance of the plug material will also be poor. That's what happened.

As a result, there is a problem of thermal shock destruction when heating is performed to burn off fine carbon particles adhering to the partition walls.

In addition, the plugging material is usually filled in such a way as to seal the end surface of the through hole to prevent fluid that does not pass through the porous partition wall from flowing out of the molded body without being filtered. However, when sealing is performed using the slurry plug material described above, a gap may occur between the partition wall and the plug material, and in that case, there is a problem that the fluid cannot be completely filtered. be.

The present inventor proposed a method for sealing the end face of a honeycomb-shaped molded body to solve this problem. First, a mask material is brought into contact with the end face of the through hole, which will become the opening, to close it, and then the sealing is performed. Japanese Patent Application No. 62-299833 proposes a method in which a plastic thin film molded body is press-fitted into the end face of a through-hole that will become a part.

However, since this method uses metals or plastics such as aluminum, copper, polyethylene, and hard rubber as the mask material, for example, when pressure is applied with a roller, the thin film formed on the mask material There is a problem in that the thickness of the thin film molding to be press-fitted into the through hole that becomes the sealing part may not be constant because the roller may move to the through hole that becomes the sealing part. occurred.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a sealing method that can reliably seal the end face of a honeycomb-shaped molded body and that can be easily performed.

(Means for Solving the Problems) The method for sealing the end face of a honeycomb-shaped molded body according to the present invention provides a method for sealing the end face of a honeycomb-shaped molded body in which a large number of through-holes are adjacent to each other in the axial direction with a thin partition wall in between. A method of sealing an end face, in which the end face of a through hole serving as an opening is closed with a mask material made of an elastic body, and then the entire end face of the honeycomb-shaped molded body is covered with a thin film molded body having plasticity, and then, Temporarily press-fitting the plastic thin film molded body into the end face of the through hole that will become the sealing part by applying pressure to the entire upper surface of the thin film molded body with a pressure tool;
Thereafter, the mask material is removed together with the thin film molded body covering the mask material, and the entire end face of the honeycomb shaped molded body is directly pressurized by a pressing tool to press the thin film molded body into the through hole. It is characterized by being press-fitted into the end face.

Hereinafter, the sealing method of the present invention will be explained in more detail based on the drawings.

FIG. 1 is a perspective view showing an example of a honeycomb-shaped molded body. 2 to 4 are diagrams showing an embodiment of the present invention, in which FIG. 2 is a plan view showing a state in which a mask material made of an elastic body is in contact with the mask material, and FIG. 3 is a diagram showing an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view for explaining the process of sealing the end faces in FIG.

1 in the figure shows a honeycomb-shaped molded body formed from the inorganic raw material that is the base material in the present invention and has a large number of honeycomb-shaped through holes, and the honeycomb-shaped molded body is made of oxides such as cordierite, alumina, silicon carbide, etc. , clay or an organic binder is added to fine powder of carbide or nitride such as silicon nitride, and molded by a conventional method such as extrusion molding. la
indicates one end surface of the nicomb-shaped molded body, that is, one end surface of a large number of through holes, 1b indicates the other end surface, 2 indicates a mask material made of an elastic body used in the sealing method of this example, and 3 indicates a plastic mask material. This shows a thin film molded article having the following properties.

In this embodiment, as shown in FIG. 2, first, on one end surface 1a, the through-hole end surface 11a (shaded portion) serving as the opening is expressed by the following formula: a<X≦a+b (where a is a honeycomb The mask material 2 is made of an elastic body and has a width defined by X, which is the width of the through-hole of the shaped molded body, and b is the thickness of the partition wall, and has the same cross-sectional shape as the through-hole 11. They come into contact and close the through-hole end surface 11a.

Next, as shown in FIG. 3(a), a thin film molded body 3 having plasticity is laminated on the upper surface of the mask material 2 to cover the entire end surface 1a of the honeycomb-shaped molded body. Then, when pressure is applied from the upper surface of the plastic molded body 3 using a pressure tool 4 such as a roller or a hydraulic press tool, as shown in FIG. 3(b),
When the roller 4 passes over the mask material, the mask material 2 enters into the through hole 11a together with the 6I membrane molded body 3b, and then when the roller 4 passes over the mask material, as shown in FIG. C
), a portion 3a of the thin film molded body 3 is temporarily press-fitted, i.e., the thin film molded body 3a is temporarily press-fitted into the end face 11b of the through hole that will become the sealing part, that is, the through hole that is not closed with the mask material.
is press-fitted into the end surface 11b.

Next, when the mask material 2 is removed, the thin film molded body 3b covering the mask material 2 is removed together with the mask material 2, resulting in a state as shown in FIG. 3(d). .

Then, as shown in FIG. 3(e), when a pressure tool 4 such as a roller or a flat plate is used to apply direct pressure so that the entire end surface 1a of the honeycomb-shaped formed body becomes flat, the thin film that had been temporarily press-fitted is The molded body 3a is completely press-fitted into the end face 11b of the through hole to form a sealed portion.

As shown in FIG.
Thin film molded bodies 3a (shaded areas), which are plugging materials, are press-fitted vertically and horizontally into holes a.

Furthermore, the other end surface 1b of a large number of through holes is
Also, it is possible to seal the other end surface of each through hole 11 which is open at one end surface, and to seal the other end surface 1b vertically and horizontally.

Here, the mask material 2 needs to have the size and shape described above and be made of an elastic material such as soft rubber, epoxy resin, silicone resin, urethane resin, or the like. The reason for this is that when a mask material made of a metal such as aluminum is used, for example, when pressure is applied by a roller, the thin film formed on the mask material forms a sealing part as the roller moves. The thickness of the thin film molded body to be press-fitted into the through-hole that becomes the sealing part may not be constant. When used, as shown in FIG. 3, when the roller passes over the mask material, the mask material invaginates into the through holes and the thin film molded body on the mask material also invaginates. When the roller is first separated from the thin molded body to be press-fitted into the through hole that will become the sealing part, the invaginated mask material and thin film molded body are restored to their original positions, while the sealing part is This is because the constituting thin film molded body is surely press-fitted into every through hole with a constant thickness without any excess thin film molded body being press-fitted. Further, the excess thin film molded body on the mask material can be easily removed together with the mask material since it has already been separated from the part of the thin film molded body that will become the plug material at the time of press-fitting.

Note that the mask material made of such an elastic body has an elastic modulus of
5 to 50 kg/d is preferred, which is 5k
If it is less than g/crd, the mask material will fall off due to displacement when covering the end face with the mask material and when roller pressure is applied, and the thin film molded body will fall unnecessarily, and when the mask material is removed, This is because removal becomes difficult, and 50 kg/c
If it exceeds wt, a sufficient elastic effect will not be obtained and the thin film molded body will move due to the pressure, similar to the metal mask material, making it difficult to form a sealing part with a uniform thickness. .

In addition, the thickness is preferably 0.01 to 2 layers.
．． If it is less than 0.1 mm, it may burst under pressure or it will be difficult to remove the unnecessary thin film molded body together with the mask material.If it exceeds 2 mm, the elastic effect will be lost and the mask will This is because it becomes difficult to invaginate the thin film molded body that should be invaginated into the through hole together with the material.

The Al thin film molded body is made of cordierite and alumina.

This thin film molded product is made of silicon carbide, silicon nitride, etc. by extrusion molding, doctor blade method, etc., has plasticity, and preferably has a thickness of about 50mm to 2mm. If it is too thin, the strength of the honeycomb-shaped molded body after forming the sealing part by the method described above will be poor; if it is too thick, the molded body will not be smooth. This is because it will not be press-fitted into the through hole as a plug material.

5 and 6 show other embodiments of the present invention, FIG. 5 is a plan view of a mask material made of an elastic body used in this embodiment, and FIG. It is a figure for explaining the process of stopping.

In this example, as shown in FIG. In Figure 6 (a)), the following formula; 11<X≦a+b(
In the formula, a is the hole width of the through hole of the honeycomb-shaped formed body, and b
is the thickness of the septum. ) A plurality of ribbons 2°a having a width X defined by The mask material 2', which is made by crossing the mask material 2' as shown in FIG.
They come into contact as shown in Figure (b).

Next, from the upper surface of the abutted mask material 2', the entire one end surface 1a is coated with, for example, cordierite, as in the above-described embodiment.
A plastic thin film molded body (not shown) made of alumina, silicon carbide, silicon nitride, etc. is molded by a conventional method such as extrusion molding or a doctor blade method, and then the entire upper surface of the thin film molded body is covered with a roller or hydraulic press. Pressure is applied using a pressurizing tool such as the above, and a portion of the plastic thin film molded body corresponding to the end surface 11b of the open through hole is press-fitted into the open end surface 11b.

Then, when the above-mentioned mask material 2' is removed, the excess thin film molded body covering the mask material 2° is also removed together with the mask material 2'.

Next, as in the above-described embodiment, the honeycomb-shaped formed body is directly subjected to planar pressure using a pressure tool such as a rough roller or a flat plate.

Thereafter, the mask material is moved 2° in the directions of arrows pi and p2 shown in FIG. 6(c), and a thin film molded body, which is a plug material, is press-fitted into the through-hole end face 11b, which is a sealing portion, in the same manner as described above.

When the mask material 2° is removed from the one end surface 1a that it was in contact with, a thin film molded body (shaded area) serving as a plug material is formed on one end surface 1a of the many through holes as shown in FIG. 6(d). Vertical and horizontal -
It will be press-fitted every other time.

Furthermore, the other end surface 1b of a large number of through holes is
Also, it is possible to seal the other end surface of each through hole 11 which is open at one end surface, and to seal the other end surface 1b vertically and horizontally.

Therefore, according to this embodiment, unlike the above embodiments,
It is no longer necessary to close the through holes for each bond in advance, improving work efficiency.

Note that the moving direction, moving amount, and moving order of the mask material 2' in this case are merely examples. The point is that the mask material gap 2'b is aligned with the end surface 11b of the through hole to be sealed, and the thin film molded body serving as the plug material is press-fitted.

Further, the ribbon 2'a constituting the mask material 2° is made of an elastic material such as soft rubber, epoxy resin, silicone resin, or urethane resin, and is processed into a ribbon shape, that is, a short strip shape, as in the above embodiment. It is what was done.

Further, as a further embodiment of the present invention, as shown in FIG. 7, the honeycomb-shaped molded body has an area that can cover the entire end face, and has an area that corresponds to the through hole that becomes the sealing part. It is also possible to use a mask material 2'' made of an integral elastic body and having a hole 2''b having the same shape and area as the cross-sectional shape of the through hole.

In this case, not only the mask with holes 2''b provided in locations corresponding to all the sealing portions as shown in FIG. 7, but also the mask with holes provided in locations corresponding to some of the sealed portions. Similarly to the above-described embodiments, the plug material can be moved as appropriate to fill and seal the desired end of the through hole with the plug material.

Further, in each of the above-described embodiments, the shape of the through-hole is approximately square, but even if the shape of the through-hole is square or triangular, such as a rectangle or diamond, the shape of the mask material or It goes without saying that the sealing method according to the present invention can be applied if the gaps and holes in the mask material have the same shape.

(Effects of the Invention) As explained above, according to the method for sealing the end of a honeycomb-shaped molded body of the present invention, a thin film molded body having plasticity is simply press-fitted as a plug material through a mask material made of an elastic body. The ends can be sealed, making it easy to work, making it possible to keep the thickness of the plug material constant, and ensuring that it penetrates without leaving any gaps between the plug material and the partition wall. The ends of the holes can be sealed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a honeycomb-shaped molded body. 2 to 4 are diagrams showing an embodiment of the present invention, in which FIG. 2 is a plan view showing a state in which a mask material is in contact with the mask material, and FIG. FIG. 4 is a schematic cross-sectional view for explaining the stopping process, and FIG. 4 is a plan view showing a state in which the end faces of the honeycomb-shaped molded body are sealed vertically and horizontally. 5 and 6 show other embodiments of the present invention, and FIG.
The figure is a plan view of the mask material used in this example, and FIG. 6 is a diagram for explaining the process of sealing the end face in this example. FIG. 7 is a plan view of a mask material used in yet another embodiment of the present invention. Knee honeycomb shaped body, 2,2°, 2”-mask material, 3
- Thin film molded body, 4 - Pressure tool, 11 - Through hole. Figure 1 Figure 2 314 Figure 5I! I Figure 7

Claims (1)

[Claims] A method for sealing the end faces of a large number of through holes in a honeycomb-shaped molded body in which a large number of through holes are adjacent to each other in the axial direction across thin partition walls, the method comprising: After closing the end faces with a mask material made of an elastic body, the entire end face of the honeycomb-shaped molded body is covered with a thin film molded body having plasticity, and then the entire upper surface of the thin film molded body is sealed by applying pressure with a pressure tool. The plastic thin film molded body is temporarily press-fitted into the end face of the through hole that will serve as the stop, and then the mask material is removed together with the thin film molded body covering the mask material. 1. A method for sealing an end face of a honeycomb-shaped molded body, comprising applying direct plane pressure to the entire end face using a pressure tool to press fit the thin film molded body into the end face of the through hole.