JP2599741B2 - Method for sealing end face of honeycomb-shaped molded body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for sealing an end face of a honeycomb-shaped formed body,
More specifically, the present invention relates to a sealing method that can easily and surely seal the end face by using a plastic thin film molded body.

(Prior Art) One end face of a through-hole of a honeycomb-shaped formed body having a large number of square-shaped or triangular-shaped through-holes continuous in a honeycomb shape via a porous thin partition wall is plugged, for example, every other length and width. A honeycomb filter made of a sintered body in which a material is filled and sealed, and the other end surface of the through hole adjacent to the sealed through hole is similarly filled with a plug material and sealed, is used for an automobile diesel engine. BACKGROUND ART There is known an exhaust gas purifying apparatus that collects and passes through and removes fine carbon contained in exhaust gas of various types of combustion equipment.

Such a honeycomb filter is prepared by adding a clay or an organic binder to a fine powder of an oxide such as cordierite, alumina or the like, or a carbide or nitride such as silicon carbide or silicon nitride, and then extruding or pipe binding. Then, a honeycomb-shaped formed body is formed by the usual method, and then the both end faces of the honeycomb-shaped formed body are sealed, for example, every other length and width to form a so-called checkered pattern, and then fired and formed under predetermined conditions. It is manufactured by

Among them, the conventional method of sealing the end face of the honeycomb-shaped molded body, for example, every other length and width, is to paste a film impregnated with an adhesive resin on one side of the honeycomb-shaped molded body, and then Drill a hole in the film with a needle according to the through hole to be sealed so that it becomes a checkerboard pattern, immerse the end face of this drilled honeycomb-shaped molded body in a container with a slurry-like plug material, and vibrate with a vibrator to penetrate A step of introducing a plug material into the hole is performed on both end faces, and a method of peeling off the film after curing the plug material under predetermined conditions, or immersing one end face of the honeycomb-shaped formed body in slurry After sealing the entire end face, the compressed air is sent from the other end face to every other vertical and horizontal through hole to open the sealing part formed on the one end face, and thereafter, the whole other end face is covered with a thin film. One end The compressed air is sent from the body to open the thin film at the other end of the through hole that is open at one end, and the other end is immersed in the slurry as described above, and the thin film is opened by the compressed air. There is a method of sealing the other end face and firing.

(Problems to be Solved by the Invention) However, in all of the above-mentioned conventional methods, when a slurry-like plug is introduced into a through hole to be sealed, the thickness of the plug material differs for each through hole. It cannot be constant. Therefore, in particular, when the thickness of the plug material is small, the strength of the honeycomb formed body after forming the sealing portion is inferior, and the heat resistance of the plug material is also inferior, and as a result, In addition, there is a problem that thermal shock destruction occurs when heating is performed for burning and removing fine carbon particles adhering to the partition walls.

Further, it is usually required that the plug material is filled so as to seal the end face of the through hole so that a fluid that does not pass through the polynomial partition wall does not flow out of the molded body without passing through. However, when sealing with the slurry-like plug material described above, a gap may be generated between the partition wall and the plug material, and in that case, there is a problem that the fluid cannot be completely passed. is there.

The present inventor has proposed a method for sealing the end face of a honeycomb-shaped formed body that solves such a problem. First, a mask material is brought into contact with an end face of a through hole to be an opening in advance and closed, and then the sealing is performed. Japanese Patent Application No. 62-299833 proposes a method of press-fitting a plastic thin film molded article into the end face of a through hole which is a part.

However, this method uses a metal or plastic material such as aluminum, copper, polyethylene, or hard rubber as a mask material, so that when a pressure is applied by a roller, for example, a thin film formed on the mask material is formed. May move to the through hole serving as the sealing portion with the movement of the roller, and the thickness of the thin film molded article to be pressed into the through hole serving as the sealing portion may not be constant. occured.

An object of the present invention is to solve the above-mentioned problems, and to provide a sealing method capable of reliably preventing an end face of a honeycomb formed body and performing the work easily.

(Means for Solving the Problems) The method for sealing an end face of a honeycomb formed article according to the present invention is directed to a method for sealing a large number of through holes of a honeycomb formed article in which a large number of through holes are adjacent in the axial direction across a thin partition wall. In a method of sealing the end face, after closing the end face of the through hole serving as an opening with a mask material made of an elastic body, the entire end face of the honeycomb-shaped formed body is covered with a thin film formed body having plasticity, The entire upper surface of the thin-film molded body is press-fitted with a pressing tool to temporarily press-fit the plastic thin-film molded body into an end surface of a through-hole serving as a sealing portion. Thereafter, the mask material is coated with the mask material. The thin film molded body is removed together with the portion of the thin film molded body, and the front end body of the honeycomb molded body is directly flat-pressed with a pressing tool to press-fit the thin film molded body into the end face of the through hole.

Hereinafter, the sealing method of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of a honeycomb formed body. 2 to 4 are views showing an embodiment of the present invention. FIG. 2 is a plan view showing a state in which a mask material made of an elastic body is in contact with the apparatus. FIG. FIG. 4 is a schematic cross-sectional view for explaining a step of sealing an end face in FIG.
The figure is a plan view showing a state in which end faces of the honeycomb formed body are sealed every other length and width.

In the figure, reference numeral 1 denotes a honeycomb-shaped formed body formed from an inorganic raw material based on the present invention and having a large number of honeycomb-shaped through-holes. The honeycomb-shaped formed body is made of an oxide such as cordierite or alumina, or silicon carbide. A clay or an organic binder is added to a fine powder of carbide or nitride such as silicon nitride or silicon nitride, and the mixture is molded by a conventional method such as extrusion molding. 1a
Indicates one end face of the honeycomb formed body, that is, one end face of many through holes, and 1b indicates the other end face. Reference numeral 2 denotes a mask material made of an elastic material used in the sealing method of the present embodiment, and reference numeral 3 denotes a plastic thin film formed body.

In the present embodiment, as shown in FIG. 2, first, at one end face 1a, the following formula; a <x ≦ a + b (where a is a honeycomb) Is the hole width of the through hole of the shaped body, and b is the thickness of the partition wall.)
A mask member 2 made of an elastic body having a width x defined by the following formula and having the same shape as the cross-sectional shape of the through hole 11 is brought into contact therewith.
Close a.

Next, as shown in FIG. 3 (a), the entire end face 1a of the honeycomb formed body is covered so that the thin film formed body 3 having plasticity is laminated on the upper surface of the mask material 2. Then, when pressure is applied from above the plastic molded body 3 using a pressing 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 intrudes into the through hole 11a together with the thin film molded body 3b, and when the roller 4 passes over the mask material, FIG. ), The thin film molded body 3 is formed on an end face 11b of a through hole serving as a sealing portion, that is, a through hole not closed by the mask material.
Is temporarily press-fitted, that is, a part of the thin film molded body 3a is press-fitted into the end face 11b.

Next, when the mask material 2 is removed, a portion of the thin film molded body 3b which has covered the mask material 2 is removed together with the mask material 2 to obtain a state as shown in FIG. 3 (d). .
Then, as shown in FIG. 3 (e), when the entire end face 1a of the honeycomb-shaped formed body is directly pressed using a pressing tool 4 such as a roller or a flat plate, the thin film which has been temporarily press-fitted is obtained. The molded body 3a is completely pressed into the through-hole end face 11b to form a sealing portion.

Then, as shown in FIG.
The thin film molded body 3a (hatched portion) serving as a plug material is press-fitted every other length and width into 1a.

Further, the same method is applied to the other end surface 1b of the large number of through holes.
In this case, the other end surface of each through hole 11 opened at one end surface can be sealed, and the other end surface 1b can be sealed every other length and width.

Here, it is necessary that the mask material 2 has the size and shape as described above, and is made of an elastic material such as soft rubber, epoxy resin, silicon resin, urethane resin, or the like. The reason is that, for example, when a mask material made of a metal such as aluminum is used, for example, when pressed by a roller, the thin film molded body on the mask material forms a sealing portion with the movement of the roller. The thickness of the thin film molded article to be pressed into the through hole serving as the sealing portion may not be constant, whereas the mask material made of an elastic body as in the present invention may be used. If used,
As shown in FIG. 3, when the roller passes over the mask material, the mask material intrudes into the through-hole, and the thin film molded body on the mask material is thereby invaded, thereby forming a sealing portion. Separated from the thin film molded product to be pressed into the hole, and then, when the roller moves, the depressed mask material and the thin film molded product are restored to their original positions, while the thin film molded material constituting the sealing portion is extra. This is because any through-hole is surely press-fitted with a constant thickness without press-fitting a thin film molded body. Also, the removal of the excess thin film molded body on the mask material can be easily removed together with the mask material since the thin film molded body serving as the plug material has already been cut off at the time of press-fitting.

The elastic member preferably has an elastic coefficient of 5 to 50 kg / cm ² . This is 5 kg / cm ²
If less than this, the mask material may fall off due to misalignment of the mask material when the end face is covered or when the roller is pressed, and unnecessary dropping of the thin film molded body may occur, making it difficult to remove the mask material. is because the, if it exceeds 50 kg / cm ² is not sufficient elasticity effect is obtained wherein the metal mask material similar thin shaped body is moved by the pressure, forming a seal having a uniform thickness This makes it difficult to do so.

Further, the thickness is preferably 0.01 to 2 mm. 0.01mm
If it is less than 2 mm, it will be difficult to rupture by pressurization or remove unnecessary thin film moldings together with the mask material.If it exceeds 2 mm, the elastic effect will be lost and it will penetrate with the mask material. This is because it becomes difficult to make the thin-film molded body to be made to indent in the hole.

The thin film molded body 3 is made of cordierite, alumina, silicon carbide, silicon nitride, or the like, and is manufactured by an extrusion molding method, a doctor blade method, or the like, and has plasticity and a thickness of about 50 μm to 2 mm. preferable. Since this thin-film formed body serves as a plug material, if it is too thin, the strength of the honeycomb-shaped formed body after forming the sealing portion by the method described above is inferior, and if it is too thick, This is because the molded body is not smoothly pressed into the through hole as a plug material.

5 and 6 show another embodiment of the present invention.
FIG. 6 is a plan view of a mask material made of an elastic material used in the present embodiment, and FIG. 6 is a diagram for explaining a step of sealing an end face in the present embodiment.

In this embodiment, as shown in FIG. 6, first, one end face of a honeycomb-shaped formed body 1 formed to have a large number of through holes 11 having a substantially square cross section, that is, one end face 1a of a large number of through holes (first FIG. 6 (a) shows the following equation: a <x ≦ a + b (where,
a is the hole width of the through-hole of the honeycomb formed body, and b is the thickness of the partition wall. ) So that the plurality of ribbons 2′a having the width x defined by) have a gap having the same shape as the cross-sectional shape of the through-hole, that is, the gap 2′b has a substantially square shape the same as the cross-sectional shape of the through-hole. Material 2 'crossed as described above
The end face 1a of the through hole, which serves as a sealing portion, and the gap 2'b of the mask material are brought into contact with one end face 1a and are brought into contact with each other as shown in FIG. 6 (b).

Next, from the upper surface of the abutting mask member 2 ', the entire one end surface 1a is, for example, cordierite, similarly to the above-described embodiment.
Alumina, silicon carbide, silicon nitride, or the like is used as a material and covered with a plastic thin film molded body (not shown) formed by a conventional method such as an extrusion molding method or a doctor blade method. Pressing is performed using a pressing tool such as the above, and the portion of the plastic thin film molded body corresponding to the end face is press-fitted into the end face 11b of the opened through hole.

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

Next, similarly to the above-described embodiment, the honeycomb formed body is directly flat-pressed by a pressing tool such as a roller or a flat plate.

Thereafter, the mask member 2 'is moved in the directions of arrows p1 and p2 shown in FIG. 6 (c) to press-fit the thin-film molded body serving as the plug material into the through-hole end face 11b serving as the sealing portion in the same manner as described above.

When the mask material 2 'is removed from the one end face 1a where the mask material 2' is in contact, as shown in FIG. 6 (d), a thin film molded body (hatched portion) as a plug material is formed on one end face 1a of a large number of through holes. It will be press-fit every other length and width.

Further, the same method is applied to the other end surface 1b of the large number of through holes.
In this case, the other end surface of each through hole 11 opened at one end surface can be sealed, and the other end surface 1b can be sealed every other length and width.

Therefore, according to the present embodiment, unlike the above embodiment, it is not necessary to individually close the through-holes serving as the openings in advance, and the working efficiency is improved.

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

The ribbon 2'a constituting the mask material 2 'is
As in the case of the above embodiment, it is made of an elastic material such as soft rubber, epoxy resin, silicon resin, urethane resin, etc., and is processed into a ribbon shape, that is, a short shape.

Further, as still another embodiment of the present invention, as shown in FIG. 7, an area having an area capable of covering the entire end face of the honeycomb formed body is provided at a position corresponding to a through hole serving as a sealing portion. Hole 2 ″ b having the same shape and the same area as the cross-sectional shape of the through hole
An embodiment using a mask material 2 ″ made of an integral elastic body having the following may be used.

In this case, not only the holes 2 ″ b provided at the locations corresponding to all the sealing portions as shown in FIG.
It is possible to use a mask material in which a hole is perforated at a part corresponding to a part thereof, and to appropriately move and fill the end of the desired through hole with a plug material and seal the same as in the above-described embodiment. it can.

Further, in each of the above-described embodiments, the shape of the through-hole is illustrated and described as being substantially square. However, even when the shape of the through-hole is a square or a triangle such as a rectangle or a rhombus, the shape of the mask material or Needless to say, the sealing method according to the present invention can be applied if the gaps and holes of the mask material have the same shape.

(Effects of the Invention) As described above, according to the method for sealing an end face of a honeycomb-shaped formed body of the present invention, the end face can be formed only by press-fitting a plastic thin film formed body as a plug through a mask material made of an elastic body. Can be sealed, the work is easy, and
The thickness of the plug can be made constant, and the end surface of the through hole can be reliably sealed so that no gap is formed between the plug and the partition.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a honeycomb formed body. 2 to 4 are views showing an embodiment of the present invention, FIG. 2 is a plan view showing a state in which a mask material is abutted, and FIG. FIG. 4 is a schematic cross-sectional view for explaining a stopping step, and FIG. 4 is a plan view showing a state in which end faces of a honeycomb-shaped formed body are sealed every other length and width. 5 and 6 show another embodiment of the present invention.
FIG. 6 is a plan view of a mask material used in this embodiment, and FIG. 6 is a diagram for explaining a step of sealing an end face in this embodiment. FIG. 7 is a plan view of a mask material used in still another embodiment of the present invention. 1 ... honeycomb-shaped molded body, 2, 2 ', 2 "... mask material, 3
…… Thin film molded body, 4 …… Pressing tool, 11 …… Through hole.

Claims (1)

(57) [Claims] 1. A method for sealing end faces of a large number of through-holes of a honeycomb-shaped formed body in which a large number of through-holes are adjacent to each other in an axial direction with a thin partition wall therebetween. Is closed with a mask material made of an elastic body, the entire end face of the honeycomb-shaped molded body is covered with a plastic thin-film molded body, and then the entire upper surface of the thin-film molded body is sealed by pressing with a pressing tool. The plastic thin film molded body is temporarily press-fitted into the end face of the through hole serving as a part, and thereafter, the mask material is removed together with the thin film molded body covering the mask material, and further, the end face of the honeycomb-shaped molded body is removed. A method for sealing an end face of a honeycomb-shaped formed body, wherein the whole is directly flat-pressed by a pressing tool and the thin film formed body is pressed into the end face of the through-hole.