JPS583619A - Production of honeycomb type filter - Google Patents

Abstract

PURPOSE:To easily produce a honeycomb structure in which the ends of every other passage are closed, by a method wherein the second ends of tubular passages having the first ends closed are stopped up with an organic binder, and the second end part is immersed into a casting slip containing an inorganic powder, followed by firing. CONSTITUTION:A honeycomb structure is molded from body prepared by kneading an inorganic powder of cordierite or the like and a binder. Then, only the first end face of the structure is immersed into a casting slip prepared by adding acetone to said body, and after taking out the structure from the casting slip, the casting slip is blown off for every other tubular passage by blowing compressed air from the second end face of the structure, and the casting slip remaining in the passages is dried. Next, the second end face of the structure is immersed into a casting slip consisting solely of an organic binder such as vinyl acetate to stop up the entire part of the second end face, and the slurry is blown off by compressed air blown from the first end face so that the binder is left only at the second ends of the passages which are closed at the first ends. After drying the binder left in the structure, the second end face of the structure is immersed in the same casting slip as that used for immersing the first end face, whereby only the second ends of the passages closed at the first ends are stopped up with the casting slip containing the inorganic powder. The structure thus obtained is dried and is fired at a temperature at which only the organic binder is pyrolyzed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple manufacturing method of a fly cam filter that effectively filters @&i fluid and granite powder.

Recently, mold particles discharged from diesel engines have become a social problem, polluting the atmosphere.As a result, one end of the honeycomb with tubular passages is closed into a pot, and the other end is closed. Patent application @ zz-ioxvta for a porous honeycomb structure in which the unclosed tubular passages on the end faces of the
6c, but it may be difficult to mass-produce it.

The present invention provides a method for easily advancing this diagonally.
It is produced by the O process as per the claims. This will be explained in detail below. - The transverse powder may be any metal, metal oxide, metal carbide, or nitride, and cordierite, Alt1 silicon carbide, silicon nitride, etc. can be used.
One grain is usually less than 10p. The binder added to this may be clay, oil or other resin, but water-cured polyurethane resin is the most effective for forming into a honeycomb structure. To do this, add a binder to the same inorganic powder as above and mix! l1t
In II-, the clay is kneaded, and this powder and binder are used for the production of the honeycomb structure.They may be the same or different from the round ones, but if the firing shrinkage etc. This closing method, which is preferably homogeneous and rounded, is disclosed in the application filed on January 29, 1939, and is known as the East method.

(In other words, the honeycomb is a tubular passage.) Take a syringe needle with a medium/narrow inner diameter, fill the 11th container of the 9th syringe with the slurry, and inject it into the entrance of each tubular passageway. Then, leave it on a flat plate with the injection port facing down, or you can put it in a centrifuge with the injection port outside. I will do it.

The injection of the slurry and clay may be carried out manually using a /TO syringe, but the syringes may be arranged in a staggered manner/rows and injected between two rows; however, in the present invention We also propose a method.

Put the above m* into the flat container S of the original painting to a depth of several square meters, dip the first end painting into it, and then blow it in a staggered manner with compressed air from #I Kodanen. Bye. The gold WiK compressed air may be sent over the honeycomb having the same end face as the end face of the honeycomb structure and closing every other honeycomb inlet. Figure 1 of the rattan is made in the manner of F-O, fL, first edge drawing, one piece of KIFI chained together, showing a perspective view of a round honeycomb willow structure.
is the honeycomb structure, J is the end face, J is the third end face, J is the tubular passage, and J is the closed part. It's a fist-like slurry of organic synthetic resin. For example, vinyl acetate or the like can be suitably used, but of course fIIIllllllllll can also be used regardless of this.

Pour the following amount of ζOx into a flat container,
Immerse the second end surface, and while it is not dry, blow it off with compressed air (this corresponds to the closed part of the first end).
Only the closed portion of the end face is opened, and the first end face is opened to form a IIJ end face opening that communicates with the round tubular passage.

Next, close the box, put it in the same flat container with a slimy bottom, and soak it in. When it dries, most of the slurry will not reach the closed part made of organic synthetic resin at both ends. At the ninth point, the first end box opens and the round tubular passage O+VS is closed.

The drying value of this powder was increased, and the temperature and time were increased to ensure that the open pores were still 7L'11 before the transverse powder was completely sintered, and that the mechanical stiffness was properly controlled by adjusting the temperature and time. do it.

Example: Hei-Aya Grain Work/Op 03 - Water-cured Polycrethane resin is mixed with Cordierite 010 by weight on a Silite guard wheel, S
Knead it to make clay, extrude it into a honeycomb structure using a well-known method, then add acetone to the same clay and knead to reduce the viscosity. Place the slurry in a flat container with a hawk face to a thickness of J. Put it in, ill
/ Dip the end face, take it out and make the first end drawing. Blow off the slurry with compressed air and dry it to form a honeycomb structure as shown in Figure 1. Put the slurry into the original picture 〇-Taishoki: J- fs, dip the first edge, and cover the entire surface with vinyl acetate mud! After immersion and closing, blow off with compressed air from the first fiii.
The vinyl acetate in the hole of the first endpiece that communicated with the ll1 endpiece O closed portion remained.

After drying, use this on the rattan/end face and dip the second end face in the same slurry as in 9. Only the first end box, which is immersed in the mouth of the rattan 1wA surface OII, will be closed with the slurry made of inorganic powder. After drying and removing heat, only the organic binder and the vinyl acetate closing agent were thermally decomposed, leaving some open pores and moderate mechanical stiffness. j& is the closed part of the first ground, 1b is the closed part of the first edge O, and the cross-sectional view along the line P P' is shown in the rattan J diagram - At -e As , As -A4
4 indicates an exhaust passage, and 4... is a round tubular passage wall that filters the exhaust gas and removes mold particles. This method is specially requested @j! −
Compared to the manufacturing method proposed in Example 1 of 10 J/J, in which the sheet is pasted at l locations to block the passage, mass production is much easier and the manufacturing man-hours are about 10%.

In this embodiment, for the sake of simplicity, a non-cam structure having a cross-sectional structure in the form of a square grid will be described.However, the present invention is not limited to this and can be applied to polygons such as triangles and hexagons!
However, even if the closed tubular passage is not limited to just one passage, but every other or more passages are closed, the efficiency is slightly reduced, but the solid particle filtering effect is still achieved. The application of the 19-piece O structure is not limited to exhaust filtration of diesel engines, but it can also be used for filtration of R bodies and image bodies, and can also be used for batteries with honeycomb partition walls of 1 m. be.

@1lII's simple 1m@111I is the 1st m1lio of the present invention with one fist closed in a crock.
FIG.

J&...jll/end face closing part, jb... J-th closing part, 4... tubular passage wall 29!1

Claims (1)

[Claims] A clay is formed by adding a binder to an inorganic powder and kneading it, and the clay is formed into a honeycomb structure in which tubular passages each having an inlet and an outlet are arranged in parallel. One end was closed with a slurry made by kneading inorganic powder with a binder, and the other end was closed with a slurry made only from an organic binder, and the first Compressed air is sent from the end to blow off the slurry (organic binder) at the end of the unclosed tubular passage, and the dry weight remains as it is without drying. Sludge Kj with added agent
A method for manufacturing a helical filter O, which is characterized by immersing and drying the ends of the scissors honeycomb structure and firing at a temperature and time such that the open pores are not lost.