JPS6294307A - Method of reinforcing honeycomb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for strengthening the peripheral wall of a honeycomb, and a method for strengthening a honeycomb by stacking and connecting honeycombs with reinforced peripheral walls to form a large honeycomb.

<Prior art and its problems> Conventionally, honeycomb (Wonθycomb, honeycomb-shaped products) was manufactured by forming an extrusion die into a die with a thick peripheral wall and performing extrusion. However, if there is a difference in the thickness of the peripheral wall and the other inner walls (ribs), the material tends to flow toward the thicker side, and there is a problem in the die structure to prevent this and where to apply resistance. be. On the other hand, as boiler exhaust gas from thermal power plants generates a large amount of heat per unit these days, the cross-sectional area of the duct in which the catalyst is located is also large, with sides as large as 10 meters. . However, due to limitations such as the capacity of extrusion machines and extrusion pressure, it is thought that the size of a single honeycomb is limited to about 20 cm on each side. Therefore, large-scale exhaust gas treatment has been handled by a structure in which a large number of honeycombs having a small diameter at -m are positioned adjacent to each other. On the other hand, when the inner wall of the honeycomb is made thicker, the honeycomb cross-sectional area of %Qi is NO
The surface area of the passage that comes into contact with the gas containing x, etc., or the reaction surface area, is small. Therefore, there has been a strong demand for a method for producing a large-sized honeycomb with a strong peripheral wall.

<Objective of the Invention> The object of the present invention is to propose an in-honeycomb method for manufacturing a large-sized honeycomb with a reinforced peripheral wall.

<Summary of the Invention> In short, there is a method of applying the same material as the honeycomb forming material and/or a mixture of reinforcing heat-resistant fibers and the same material to the honeycomb surface before it dries to strengthen the peripheral wall, and a honeycomb with the peripheral wall reinforced. It is characterized by stacking the honeycombs to form a large honeycomb before the surface dries.

Conventionally, the method for obtaining a large beehive structure is to use a large extruded material to obtain a large beehive structure from the beginning, and as shown in FIG. Various methods have been used, such as arranging and assembling bee beam structures, and pasting them together with adhesive, but in order to perform large extrusion, large extrusion molding materials are required, which requires a very high capital investment. becomes. Furthermore, there is a natural limit to the size of the device, and the maximum size is 300 mm square to 500 mm square. In the method of arranging metal formwork around the product, the formwork must be made of high-quality material when used at high temperatures. The method of pasting together with adhesive cannot be done until the bee beam structure has completely assimilated and dried, and if the bee beam structure is not accurate, there will be gaps when stacking them, or they will become distorted if they are stacked in large numbers. There was fear.

<Example 1> FIG. 3 is a perspective view of an extruded honeycomb, and FIG. 4 is an enlarged view of section A in FIG. 3.

FIGS. 1 and 2 are enlarged views of the corners of a honeycomb according to the embodiment of the present invention.

That is, before the outer surface of the honeycomb dries, a kneaded material 5 made of a mixture of short heat-resistant fibers 4 and the same material as the honeycomb forming material is applied to the outer surface of the outermost peripheral wall 1. As a result, since the dough material of the kneaded material 5 applied during honeycomb firing and the honeycomb forming material are the same material, the difference in thermal expansion is small and there is no possibility of peeling or cracking. The adhesive is bonded before drying and will not peel off.

<Example 2> Figure 5 shows the second example, in which a thin layer of a kneaded mixture of short heat-resistant fibers was applied to the outer surface of the honeycomb before drying.
Alternatively, if necessary, heat-resistant fibers may be spread thinly, and then only the fabric material may be applied to the surface.

<Example 3> Fig. 6 shows a case in which a fabric material is first applied to the surface of a honeycomb, then a steel wire mesh is attached, and a roughening material is applied thereon.

<Example 4> To explain the present invention with reference to an example, as shown in FIG. 8 and FIG.
``......The heat-resistant fibrous material 3 is kneaded with the same material as the extruded material, sandwiched together, and honeycombs are layered to obtain a large honeycomb structure.In addition, in this method, heat-resistant fiber You may also use the product without the substances.

<Example 5> As shown in FIG. 10, a honeycomb 11 immediately after being extruded.
11', 11''..., a heat-resistant fibrous material 13 made of short fibers of a heat-resistant fibrous material 13 such as rock wool is spread, and after applying the same material as the extruded material, a plurality of bee beam structures are formed. By combining the pieces, a large bee beam structure is obtained.

In addition, in this method, the honey beam structures may be overlapped only by scattering the heat-resistant fibrous material made into short fibers.

<Effects of the Invention> By carrying out the present invention, the heat-resistant fibrous material 4 is intricately intertwined within the kneaded material 5 and is fixed after drying and firing, thereby forming the outermost wall and providing a honeycomb with improved impact resistance. did it.

According to the present invention, it is no longer necessary to extrude the outermost wall 1 of the honeycomb structure shown in FIG. 2 thicker than the other ribs 3, and it is possible to extrude the ribs in all parts with an even thickness and an average thickness.
became.

In addition, the outermost wall 1, where the rib thickness is thick, has less resistance during extrusion molding than other parts, so it is easy to extrude only the outermost wall, and it is difficult to adjust the moldability, fluidity, and viscosity of extrudable materials, making it ideal for uniform extrusion. Although there were inconveniences such as a limited range of conditions, according to the present invention, all parts are extruded under average conditions, making it possible to extrude evenly and significantly reducing the difficulty in kneading materials. Ta.

As shown in Figure 1.2.5, the heat-resistant fibers are intricately intertwined, resulting in excellent strength and impact resistance, and no cracking.

On the other hand, a method of kneading the fibers into a honeycomb extrudable material was also carried out, but it was found that the fibers were difficult to pass through the die, making it extremely difficult to press Bat L molding, and it was found to be practically impossible.

Further, by carrying out the present invention, small honeycombs can be bonded and stacked to form a large honeycomb, so the extrusion molding machine can be made small and the investment in equipment can be reduced. For example, 3
There is a price difference of several dozen times between extrusion molding machines for 5 mm square and 150 mm square. In addition, the strength is increased because the heat-resistant fiber reinforcement is stretched vertically and horizontally inside the henicam.

There is an effect that a molded article of desired size can be obtained depending on the number of pieces combined.

The price difference between 35 mm square and 150 mm square molding dies is several to several times higher.

Since the amount of raw material remaining in the extrusion molding machine when molding is interrupted varies from several times to several tens of times depending on the size of the molding machine, the raw material yield is also better in small-sized Ii.

[Brief explanation of drawings]

Fig. 1 is a partial view of a honeycomb corner according to a first embodiment of the present invention, Fig. 2 is an enlarged view of the corner of Fig. 1, Fig. 3 is a perspective view of a conventional honeycomb, and Fig. 4. is an enlarged view of the corner, No. 5
The figure is a partial view of the corner of the second embodiment, FIG. 6 is a partial view of the corner of the third embodiment, and FIG. 7 is an extrusion molded honeycomb.
The surface is not dry in the perspective view / perspective view, Figure 8 is the fourth embodiment with a large stacked honeycomb / perspective view, Figure 9 is an enlarged view of part A in Figure 8, Figure 10 is Short heat-resistant fibers are spread on the surface of the honeycomb that is not dry, and the same material as the honeycomb forming material is applied and stacked. Partially enlarged view of part 8 corresponding to part A. Figure 11 shows the conventional metal It is a perspective view of four honeycombs housed within a frame. 1... Two cam outer peripheral wall 2... Rib 3... Opening 4... Heat resistant fibrous material 5... Kneaded material 6... ...Steel wire

Claims (1)

[Claims] 1. Before the surface of the extrusion-molded honeycomb dries, the same material as that forming the honeycomb is coated to thicken the honeycomb peripheral wall and strengthen the honeycomb. How to strengthen honeycomb. 2. Claim 1, characterized in that the honeycomb is strengthened by applying a mixture of the same material forming the honeycomb and a short heat-resistant fibrous material to the honeycomb peripheral wall.
Honeycomb strengthening method described in section. 3. A patent claim characterized in that before the surface of the honeycomb peripheral wall dries, heat-resistant fibrous material of short dimensions is spread on the surface, and then the same material as the honeycomb forming material is applied to the surface to strengthen the honeycomb peripheral wall. The honeycomb strengthening method according to item 1. 4. Before the surface of the honeycomb peripheral wall dries, a metal mesh is placed on the surface, and the same material as the honeycomb forming material is applied to the surface to strengthen the honeycomb peripheral wall. How to strengthen honeycomb. 5. A plurality of honeycombs strengthened by applying the same material as the honeycomb forming material and/or a mixture of short heat-resistant fibrous material to the honeycomb peripheral wall are stacked and connected before the surface dries to form a large-sized honeycomb. A honeycomb strengthening method according to any one of claims 1 to 4, characterized in that: