JP2015090114A - Holding seal material, winding body and exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide holding seal material in which cracking caused by concentration of stress at the time of its press fitting is prevented from being generated and wind erosion is difficult to be produced.SOLUTION: This invention relates to holding seal material comprising a rectangular-shaped mat having a first long side and a second long side extending in a longitudinal direction and a first short side and a second short side. The first long side corresponds to a portion entered into a casing at first when a winding body is press fitted into the casing, the first short side has a polygonal-shaped salient, the second short side has a polygonal-shaped concavity corresponding to the aforesaid salient shape, the salient and the concavity are fitted to each other when the holding seal material is rolled up into a cylindrical shape, a first top point that is the nearest to the first long side and the first long side are connected by one straight line, an angle α positioned outside the holding seal material is in a range exceeding 105° and less than 180°, and an angle β positioned in the holding seal material is in a range exceeding 105° and less than 180°.

Description

The present invention relates to a holding sealing material, a wound body, and an exhaust gas purification device.

Conventionally, in order to purify harmful substances such as harmful gases contained in exhaust gas discharged from an internal combustion engine such as an engine, an exhaust gas purification device has been provided in the exhaust passage (exhaust pipe through which the exhaust gas flows) of the internal combustion engine. ing.
The exhaust gas purification apparatus has a structure in which a casing is provided in an exhaust passage of an internal combustion engine, and an exhaust gas treatment body is disposed in the casing. Examples of the exhaust gas treating body include a catalyst carrier or a diesel particulate filter (DPF).

A holding sealing material made of an inorganic fiber aggregate is wound around the exhaust gas treating body and disposed in the casing. This holding sealing material prevents the exhaust gas treating body from being damaged by contact with the casing covering the outer periphery due to vibrations or impacts caused by traveling of an automobile or the like, and exhaust gas from between the exhaust gas treating body and the casing. Is disposed mainly for the purpose of preventing leakage.

The exhaust gas purification device is manufactured by a method in which a wound body obtained by winding a holding seal material around an exhaust gas treatment body is press-fitted into a casing.
Patent Document 1 discloses a technique in which a holding sealing material in which a convex portion is formed at one end and a concave portion corresponding to the convex portion is formed at the other end is wound around a catalyst holding body and press-fitted into a metal pipe (casing). Has been.

JP 2001-161051 A

When the holding sealing material in which the convex part and the concave part are formed is wound around the catalyst holding body and press-fitted into the casing, the convex part is the apex of the shape constituting the convex part (rectangular in the case of Patent Document 1). Among the portions that are starting points protruding from the material, there is a problem that stress may concentrate on the starting point on the side that enters the casing first, and cracks may occur during press-fitting.

Further, when the holding sealing material is wound around the exhaust gas treating body, both ends of the holding sealing material are not completely in contact with each other, and a slight gap is generated.
In the shape of the convex part and the concave part as in Patent Document 1, the gap generated between the convex part and the concave part is parallel to the longitudinal direction of the exhaust gas treating body after the wound body is pressed into the casing to form the exhaust gas purification device. This is the same direction as the flow direction of the gas flowing into the exhaust gas purification device.
For this reason, the exhaust gas easily flows into the gap formed between the convex portion and the concave portion, and the exhaust gas that has flowed into the gap concentrates on the portion where the convex portion protrudes from the holding seal material and hits the wind erosion of this portion. There is a problem that it is easy to occur.

In the present invention, it is possible to prevent stress from concentrating at the time of press-fitting into a portion where the convex portion protrudes from the holding sealing material, and to generate a crack, and further, the convex portion serves as a starting point from which the convex portion protrudes from the holding sealing material. It is an object of the present invention to provide a holding sealing material in which wind erosion due to gas flowing into the exhaust gas purifying apparatus is unlikely to occur in a portion where the gas is present. Further, a wound body that prevents stress from concentrating at the time of press-fitting into a portion where the convex portion protrudes from the holding sealing material and prevents cracks, and a starting point from which the convex portion protrudes from the holding sealing material, An object of the present invention is to provide an exhaust gas purifying apparatus in which wind erosion due to gas flowing into the exhaust gas purifying apparatus does not easily occur.

In order to achieve the above object, the holding sealing material of the present invention has a first long side and a second long side extending in the longitudinal direction in the plan view shape, and the first long side and the second long side. It consists of a mat with a substantially rectangular shape in plan view, having a first short side and a second short side connecting the long sides, respectively, wound around the side surface of the columnar exhaust gas treatment body and press-fitted into the casing as a wound body Holding sealing material used for
The first long side is a portion that first enters the casing when press-fitting the wound body into the casing,
The first short side has a polygonal convex portion, the second short side has a polygonal concave portion corresponding to the shape of the convex portion, and the first short side When the holding sealing material is rolled into a cylindrical shape so that the side and the second short side are in contact with each other, the convex portion and the concave portion are configured to fit each other,
The first vertex that is the vertex closest to the first long side among the vertexes of the polygon that constitutes the convex portion is connected to the first long side by a single straight line,
Maintaining the angle between the straight line connecting the first vertex of the convex portion and the first long side and the side extending from the first vertex and forming a part of the outer periphery of the convex portion. The angle α located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 °. It is characterized by being less than 180 °.

In the holding sealing material of the present invention, an angle formed by a straight line connecting the first vertex of the convex portion and the first long side and a side extending from the first vertex and constituting a part of the outer periphery of the convex portion. Of these, the angle α located outside the holding sealing material is more than 105 ° and less than 180 °.
In the conventional holding sealing material in which the angle α is 90 °, stress concentrates on the first vertex of the convex portion when the wound body is press-fitted. It is presumed that the direction of stress applied to the convex portion during press-fitting is a direction parallel to the width direction of the holding sealing material. For this reason, the holding sealing material is fixed and a load in cantilever bending is applied to the first apex of the convex portion. Furthermore, since this shape has a high stress concentration factor, excessive stress is applied to the first apex of the convex portion. It is presumed that they are concentrating on.
The stress concentration factor decreases as the radius of curvature of the convex portion angle increases, and the stress concentration load decreases accordingly. When the angle α is changed in a region larger than 90 °, the stress concentration coefficient is higher than that of the holding sealing material in a region where the angle α is 105 ° or less.
Therefore, it is effective to prevent the stress α from concentrating on the first apex of the convex portion when press-fitting the wound body, and to prevent the stress from being concentrated, by making the angle α greater than 105 °. By doing so, it is possible to prevent the holding sealing material from being cracked.

Moreover, in the holding sealing material of this invention, the angle located in a holding sealing material among the angles which the straight line which connects the 1st vertex of a convex part and a 1st long side, and a 1st long side form β is greater than 105 ° and less than 180 °. If this angle β is an obtuse angle exceeding 105 °, the direction of the gap formed between the convex part and the concave part and the direction in which the exhaust gas flows are not parallel but sufficiently inclined. Exhaust gas flowing into the gap formed between them concentrates on a specific part and becomes difficult to hit, and wind erosion is prevented.
Therefore, wind erosion of the holding sealing material due to the exhaust gas flowing into the gap formed between the convex portion and the concave portion is prevented.

In the holding sealing material of the present invention, the first long side and the side extending from the first vertex and constituting a part of the outer periphery of the convex portion are parallel, and the angle α and the angle β Are desirably equal.
The exhaust gas that has flowed into the gap formed between the first short side and the second short side may leak outside without passing through the exhaust gas treating body. Therefore, the distance until the exhaust gas leaks to the outside is preferably increased. Further, since the exhaust gas continues to receive resistance from the wall surface while passing through the gap, the speed of the exhaust gas is gradually decreased, and the wind erosion impact of the exhaust gas to the specific part is reduced, which is preferable.

In the holding sealing material of the present invention, one polygon is formed from the second vertex that is the closest to the second long side among the polygonal vertices constituting the convex portion to the second long side. Connected in a straight line,
The second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex portion are parallel to each other,
Retained among angles formed by a straight line connecting the second vertex of the convex part and the second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex part. The angle γ located outside the sealing material is a right angle, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material is a right angle. Is desirable.
With the above configuration, it is possible to prevent the second short side from being bent by the friction during the press-fitting and jumping out of the casing when the wound body is press-fitted.

In the holding sealing material of the present invention, one polygon is formed from the second vertex that is the closest to the second long side among the polygonal vertices constituting the convex portion to the second long side. Connected in a straight line,
Retained among angles formed by a straight line connecting the second vertex of the convex part and the second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex part. The angle γ located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material exceeds 105 °. Desirably, it is less than 180 °.
With the above configuration, the shear stress applied to the second vertex at the time of press-fitting of the wound body is relieved, and cracks of the holding sealing material from the second vertex are suppressed.

The wound body of the present invention is
A columnar exhaust gas treatment body;
It is composed of a holding sealing material wound around the side surface of the exhaust gas treating body and having a substantially rectangular shape in plan view,
A wound body used for press-fitting in a casing,
The holding sealing material is
In the plan view shape, the first long side and the second long side that extend in the longitudinal direction, and the first short side and the second short side that connect the first long side and the second long side, respectively. It consists of a mat that has a side and a substantially rectangular shape in plan view.
The first long side is a portion that first enters the casing when press-fitting the wound body into the casing,
The first short side has a polygonal convex portion, the second short side has a polygonal concave portion corresponding to the shape of the convex portion, and the first short side When the holding sealing material is rolled into a cylindrical shape so that the side and the second short side are in contact with each other, the convex portion and the concave portion are configured to fit each other,
The first vertex that is the vertex closest to the first long side among the vertexes of the polygon that constitutes the convex portion is connected to the first long side by a single straight line,
Maintaining the angle between the straight line connecting the first vertex of the convex portion and the first long side and the side extending from the first vertex and forming a part of the outer periphery of the convex portion. The angle α located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 °. It is characterized by being less than 180 °.

In the wound body of the present invention, the straight line connecting the first vertex and the first long side of the convex portion of the holding sealing material wound around the side surface of the exhaust gas treating body, and the convex portion extending from the first vertex. Among the angles formed with the sides constituting a part of the outer periphery, the angle α located outside the holding sealing material is more than 105 ° and less than 180 °.
When such a wound body is press-fitted into the casing with the first long side of the holding sealing material as the head, stress is prevented from concentrating on the first vertex of the convex portion at the time of press-fitting, and cracks are generated. Is prevented from occurring.

In the wound body of the present invention, the first long side of the holding sealing material and the side constituting a part of the outer periphery of the convex portion extending from the first vertex are parallel, It is desirable that the angle α is equal to the angle β.
When an exhaust gas purification device is manufactured using the wound body and exhaust gas is allowed to flow, the exhaust gas flowing into the gap formed between the first short side and the second short side passes through the exhaust gas treatment body. However, since the distance between the gaps is increased, the distance until the exhaust gas leaks to the outside is preferably increased. Further, since the exhaust gas continues to receive resistance from the wall surface while passing through the gap, the speed of the exhaust gas is gradually decreased, and the wind erosion impact due to the exhaust gas is reduced, which is preferable.

In the wound body of the present invention, from the second vertex which is the vertex closest to the second long side among the vertexes of the polygon constituting the convex portion of the holding sealing material, the second length It is connected to the side with a single straight line,
The second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex portion are parallel to each other,
Retained among angles formed by a straight line connecting the second vertex of the convex part and the second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex part. The angle γ located outside the sealing material is a right angle, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material is a right angle. Is desirable.
With the above configuration, it is possible to prevent the second short side from being bent by the friction during the press-fitting and jumping out of the casing when the wound body is press-fitted.

In the wound body of the present invention, from the second vertex which is the vertex closest to the second long side among the vertexes of the polygon constituting the convex portion of the holding sealing material, the second length It is connected to the side with a single straight line,
Retained among angles formed by a straight line connecting the second vertex of the convex part and the second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex part. The angle γ located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material exceeds 105 °. Desirably, it is less than 180 °.
With the above configuration, the shear stress applied to the second vertex at the time of press-fitting of the wound body is relieved, and cracks of the holding sealing material from the second vertex are suppressed.

The exhaust gas purifying apparatus of the present invention is an exhaust gas purifying apparatus having a gas inflow side end portion into which exhaust gas flows and a gas outflow side end portion from which exhaust gas flows out, wherein the wound body of the present invention is press-fitted into a casing. ,
The first long side of the holding sealing material is located on the gas inflow side end of the exhaust gas purifying device.

In the exhaust gas purifying apparatus of the present invention, in the holding sealing material constituting the exhaust gas purifying apparatus, the first long side is located at the end of the gas inflow side of the exhaust gas purifying apparatus. Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 ° and is 180 °. Is less than. If this angle β is an obtuse angle exceeding 105 °, the direction of the gap formed between the convex part and the concave part and the direction in which the exhaust gas flows are not parallel but oblique, so that the exhaust gas flowing into the gap is in a specific part. It is difficult to concentrate on and prevent wind erosion. Therefore, wind erosion of the holding sealing material due to the exhaust gas flowing into the gap formed between the convex portion and the concave portion is prevented.

Fig.1 (a) is a perspective view which shows typically an example of the holding sealing material of this invention, and FIG.1 (b) is the top view. FIG. 2 is a perspective view schematically showing an example of a wound body of the present invention in which the holding sealing material shown in FIGS. 1 (a) and 1 (b) is wound around the side surface of the exhaust gas treating body. FIG. 3 is a perspective view schematically showing an example of the exhaust gas treating body constituting the wound body of the present invention. FIG. 4 is a perspective view schematically showing how the wound body of the present invention is press-fitted into the casing. FIG. 5 is a cross-sectional view schematically showing an example of the exhaust gas purifying apparatus of the present invention. FIG. 6 (a) is an explanatory view schematically showing the flow of exhaust gas flowing into the gap formed between the first short side and the second short side in the exhaust gas purification apparatus using the holding sealing material of the present invention. FIG. 6B is an explanatory diagram schematically showing the flow of the exhaust gas flowing into the gap formed between the first short side and the second short side when the angle β is a right angle. FIG. 7 is a plan view schematically showing another example of the holding sealing material of the present invention. FIG. 8 is a plan view schematically showing another example of the holding sealing material of the present invention. FIG. 9 is a plan view schematically showing another example of the holding sealing material of the present invention. FIG. 10A to FIG. 10E are plan views showing the shapes of test pieces used in the stress evaluation test. FIG. 11 is a perspective view schematically showing how the stress evaluation test is performed.

(Detailed description of the invention)
Hereinafter, the holding sealing material, the wound body, and the exhaust gas purification apparatus of the present invention will be specifically described. However, the present invention is not limited to the following configurations, and can be applied with appropriate modifications without departing from the scope of the present invention. Note that the present invention also includes a combination of two or more desirable configurations of the present invention described below.

First, the holding sealing material of the present invention will be described.
The holding sealing material of the present invention has a first long side and a second long side extending in the longitudinal direction and a first long side and a second long side connected in the longitudinal direction, respectively. A holding seal used for the purpose of having a short rectangular side and a second short side and having a substantially rectangular shape in a plan view, wound around a side surface of a columnar exhaust gas treatment body and press-fitted into a casing as a wound body Material,
The first long side is a portion that first enters the casing when press-fitting the wound body into the casing,
The first short side has a polygonal convex portion, the second short side has a polygonal concave portion corresponding to the shape of the convex portion, and the first short side When the holding sealing material is rolled into a cylindrical shape so that the side and the second short side are in contact with each other, the convex portion and the concave portion are configured to fit each other,
The first vertex that is the vertex closest to the first long side among the vertexes of the polygon that constitutes the convex portion is connected to the first long side by a single straight line,
Maintaining the angle between the straight line connecting the first vertex of the convex portion and the first long side and the side extending from the first vertex and forming a part of the outer periphery of the convex portion. The angle α located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 °. It is characterized by being less than 180 °.

Fig.1 (a) is a perspective view which shows typically an example of the holding sealing material of this invention, and FIG.1 (b) is the top view.
As will be described later, the holding sealing material shown in FIGS. 1A and 1B is a holding sealing material that can be used in the wound body and the exhaust gas purification apparatus of the present invention.
The holding sealing material 10 has a first long side extending in a longitudinal direction (a direction indicated by a double arrow a in FIGS. 1A and 1B) in a plan view shape (see FIG. 1B). 21 and a second long side 22, and a mat having a substantially rectangular shape in plan view, having a first short side 31 and a second short side 32 connecting the first long side 21 and the second long side 22, respectively. It is.
Both the first long side 21 and the second long side 22 are parallel to the longitudinal direction of the holding sealing material 10.

The first short side 31 is a side that connects the first long side 21 and the second long side 22, but is a side defined as an aggregate of a plurality of sides. Reference numerals 31a, 31b, 31c, The side connecting 31d and 31e is defined as a first short side 31.
The first short side 31 has a rectangular convex portion 41, and the convex portion 41 is held by three sides 31 b, 31 c, and 31 d that constitute a part of the first short side 31, and holding It is a rectangular part surrounded by a total of four sides 33 indicated by dotted lines drawn inside the sealing material. The side 33 is a side determined as a line connecting a first vertex and a second vertex, which will be described later, but is only part of the inside of the holding sealing material 10 in appearance.
The quadrangle constituting the convex portion 41 has four vertices represented by reference numerals 42a, 42b, 42c and 42d, respectively.
Of these vertices constituting the convex portion, the vertex 42a closest to the first long side 21 is called a first vertex, and the vertex 42d closest to the second long side 22 is called a second vertex. .

Of the sides constituting the first short side 31, the side represented by reference numeral 31a is the side connecting the first vertex 42a and the first long side 21, and the side represented by reference numeral 31e. Is a side connecting the second vertex 42 d and the second long side 22.

In the holding sealing material 10, a side (straight line) 31 a connecting the first vertex 42 a of the convex portion 41 and the first long side 21, and a part of the outer periphery of the convex portion 41 extending from the first vertex 42 a are configured. Of the angles formed with the side 31b, the angle positioned outside the holding sealing material 10 is an angle represented by α, and the angle α is greater than 105 ° and less than 180 °.
The angle α is desirably 120 to 165 °, and the angle α is more desirably 135 to 150 °. Within the above range, the stress relaxation effect due to the angle α can be sufficiently obtained. Further, when the holding sealing material is wound around the exhaust gas treating body, the holding sealing material can be appropriately curved so that the exhaust gas treating body can be wound. If the angle α is smaller than 120 °, the stress relaxation effect due to the angle α may not be sufficiently obtained. If the angle α is larger than 165 °, the holding sealing material may not be bent when it is wound around the exhaust gas treating body and may be broken and damaged.
Of the angles formed between the first long side 21 and the side (straight line) 31 a that connects the first vertex 42 a of the convex portion 41 and the first long side 21, the angle located in the holding sealing material Is an angle represented by β, and the angle β is more than 105 ° and less than 180 °.
The angle β is desirably 120 to 165 °, and the angle β is more desirably 135 to 150 °. Within the above range, the effect of preventing wind erosion can be sufficiently obtained. If the angle β is smaller than 120 °, the effect of preventing wind erosion may not be sufficiently obtained. If the angle β is larger than 165 °, the holding sealing material may not be bent and may be broken when wound around the exhaust gas treating body.

In the holding sealing material 10, the first long side 21 and the side 31 b that extends from the first vertex 42 a and forms a part of the outer periphery of the convex portion 41 are parallel. Therefore, the angle α and the angle β have a complex angle relationship and are the same angle.

A side (straight line) 31e connecting the second vertex 42d of the convex portion 41 of the holding sealing material 10 and the second long side 22 and a part of the outer periphery of the convex portion 41 extend from the second vertex 42d. Of the angles formed with the side 31d, the angle located outside the holding sealing material 10 is an angle represented by γ. In the holding sealing material 10, the angle γ is 90 °, but in the holding sealing material of the present invention, the angle γ is not particularly limited.
Of the angles formed by the second long side 22 and the side (straight line) 31e connecting the second vertex 42d of the convex portion 41 and the second long side 22, the angle located in the holding sealing material. Is an angle represented by δ. In the holding sealing material 10, the angle δ is 90 °, but in the holding sealing material of the present invention, the angle δ is not particularly limited.

The second short side 32 is a side that connects the first long side 21 and the second long side 22 and is located on the opposite side of the first short side 31, and the first short side 31. Similar to, it is a collection of multiple sides.
The shape of the second short side 32 matches the shape of the first short side 31 so that it fits with the first short side 31 when the holding sealing material 10 is wound around the columnar exhaust gas treatment body. And has side 32a, side 32b, side 32c, side 32d and side 32e corresponding to side 31a, side 31b, side 31c, side 31d and side 31e, respectively, constituting the first short side. ing.
The second short side 32 has a concave portion 43 configured to fit with the convex portion 41.

The holding sealing material of the present invention is made of a mat containing inorganic fibers. The inorganic fibers constituting the mat are not particularly limited, and may be alumina-silica fibers, alumina fibers, silica fibers, or the like. Moreover, glass fiber and biosoluble fiber may be sufficient. What is necessary is just to change according to the characteristics requested | required of mat | matte, such as heat resistance and wind erosion resistance, and it is preferable to use the thing of the large diameter fiber and fiber length which can adapt to the environmental regulation of each country.

Among these, low crystalline alumina inorganic fibers are desirable, and low crystalline alumina inorganic fibers having a mullite composition are more preferable. In addition, inorganic fibers containing a spinel compound are more preferable. A highly crystalline alumina material is hard and brittle, so it is not suitable for a mat used as a cushioning material.

Further, in the case of an inorganic fiber containing a low crystalline alumina material and a spinel type compound, the crystallization ratio is preferably in the range of 0.1 to 30%, and more preferably in the range of the crystallization rate of 0.4 to 20%. Mats made of inorganic fibers in this range have a high repulsive force and a high restoration surface pressure after a durability test, and have good performance. However, when the crystallization ratio is less than 0.1% or exceeds 30%, the repulsive force and the restoring surface pressure are rapidly decreased. The method for measuring the crystallization rate can be calculated from the integral intensity ratio of the mullite diffraction line (2θ = 26.4 °) and the γ-alumina diffraction line (2θ = 45.4 °).

The mat constituting the holding sealing material can be obtained by various methods. For example, the mat can be produced by a needling method or a papermaking method.
In particular, a needle mat obtained by subjecting a base mat made of inorganic fibers to needle punching is desirable. The needle punching process refers to inserting and removing fiber entanglement means such as a needle with respect to the base mat.

In order to exhibit the entangled structure, the inorganic fibers constituting the mat obtained by the needling method have a certain average fiber length, for example, the average fiber length of the inorganic fibers is preferably 1 to 150 mm, More preferably, it is 10-80 mm.
If the average fiber length of the inorganic fiber is less than 1 mm, the fiber length of the inorganic fiber is too short, so that the entanglement between the inorganic fibers becomes insufficient, the wrapping property to the exhaust gas treating body is lowered, and the holding sealing material is easily broken. Become. On the other hand, if the average fiber length of the inorganic fibers exceeds 150 mm, the fiber length of the inorganic fibers is too long, so the number of fibers constituting the holding sealing material is reduced, and the denseness of the mat is lowered. As a result, the shear strength of the holding sealing material is lowered.

The average fiber length of the inorganic fibers constituting the mat obtained by the papermaking method is preferably 0.1 to 20 mm.
When the average fiber length of the inorganic fiber is less than 0.1 mm, the fiber length of the inorganic fiber is too short, so that the characteristics as a fiber are no longer substantially exhibited. Entanglement does not occur and it becomes difficult to obtain sufficient surface pressure. In addition, when the average fiber length of the inorganic fibers exceeds 20 mm, the fiber length of the inorganic fibers is too long, so that the entanglement of the fibers in the slurry solution in which the fibers are dispersed in water in the paper making process becomes too strong. When it is set as an aggregate, the fibers are likely to be accumulated unevenly.
The fiber length is measured by using tweezers for both the needling method and the paper making method so that the fibers are not broken from the mat and the fiber length is measured using an optical microscope. Here, 300 fibers were extracted and the average of the fiber lengths was defined as the average fiber length. If the fibers cannot be pulled out without breaking the fibers from the mat, the mat is degreased, the degreased mat is put into water, and the fibers are collected so as not to break while loosening the fibers.

Further, the weight per unit area of the holding sealing material (weight per unit area) is not particularly limited, is preferably a 200~4000g / ^{m 2,} and more desirably 1000 to 3000 g / ^{m 2.} When the basis weight of the holding sealing material is less than 200 g / m ² , the holding force is not sufficient, and when the basis weight of the holding sealing material exceeds 4000 g / m ² , the bulk of the holding sealing material is difficult to decrease. Therefore, when manufacturing an exhaust gas purification apparatus using such a holding sealing material, the exhaust gas treating body is likely to drop off.
The thickness of the holding sealing material is desirably 5 to 15 mm.

Next, the wound body of the present invention will be described.
The wound body of the present invention is
A columnar exhaust gas treatment body;
It is composed of a holding sealing material wound around the side surface of the exhaust gas treating body and having a substantially rectangular shape in plan view,
A wound body used for press-fitting in a casing,
The holding sealing material is
In the plan view shape, the first long side and the second long side that extend in the longitudinal direction, and the first short side and the second short side that connect the first long side and the second long side, respectively. It consists of a mat that has a side and a substantially rectangular shape in plan view.
The first long side is a portion that first enters the casing when press-fitting the wound body into the casing,
The first short side has a polygonal convex portion, the second short side has a polygonal concave portion corresponding to the shape of the convex portion, and the first short side When the holding sealing material is rolled into a cylindrical shape so that the side and the second short side are in contact with each other, the convex portion and the concave portion are configured to fit each other,
The first vertex that is the vertex closest to the first long side among the vertexes of the polygon that constitutes the convex portion is connected to the first long side by a single straight line,
Maintaining the angle between the straight line connecting the first vertex of the convex portion and the first long side and the side extending from the first vertex and forming a part of the outer periphery of the convex portion. The angle α located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 °. It is characterized by being less than 180 °.

FIG. 2 is a perspective view schematically showing an example of a wound body of the present invention in which the holding sealing material shown in FIGS. 1 (a) and 1 (b) is wound around the side surface of the exhaust gas treating body.
The wound body 140 shown in FIG. 2 is formed by winding the holding sealing material 10 shown in FIGS. 1A and 1B around the side surface of the exhaust gas treatment body 120, and the convexity of the wound holding sealing material 10 is. The part 41 and the recessed part 43 are mutually fitted.

There is a slight gap between the first short side 31 and the second short side 32. The influence of the exhaust gas flowing into this gap will be described later.

FIG. 3 is a perspective view schematically showing an example of the exhaust gas treating body constituting the wound body of the present invention.

The exhaust gas treatment body 120 shown in FIG. 3 is a honeycomb structure made of a columnar ceramic material in which a large number of cells 125 are provided side by side with cell walls 126 therebetween. One end of each cell 125 is sealed with a sealing material 128. In addition, an outer peripheral coat layer 127 is provided on the outer periphery of the honeycomb structure for the purpose of reinforcing the outer peripheral portion of the honeycomb structure, adjusting the shape, and improving the heat insulation of the honeycomb structure.
Note that the surface on which the outer peripheral coat layer 127 is provided is the side surface of the honeycomb structure.

When either end of the cell 125 is sealed, when viewed from one end of the exhaust gas treating body 120, the cells whose end are sealed and the cells that are not sealed are alternately arranged. It is desirable that

The cross-sectional shape obtained by cutting the exhaust gas treatment body in a direction perpendicular to the longitudinal direction is not particularly limited, and may be a substantially circular shape or a substantially oval shape, or a substantially polygonal shape such as a substantially triangular shape, a substantially square shape, a substantially pentagonal shape, or a substantially hexagonal shape. May be.

The cross-sectional shape of the cell 125 constituting the exhaust gas treating body may be a substantially polygonal shape such as a substantially triangular shape, a substantially square shape, a substantially pentagonal shape, or a substantially hexagonal shape, or may be a substantially circular shape or a substantially elliptical shape. Further, the exhaust gas treating body 120 may be a combination of cells having a plurality of cross-sectional shapes.

The material constituting the exhaust gas treating body is not particularly limited, and non-oxides such as silicon carbide and silicon nitride, and oxides such as cordierite and aluminum titanate can be used. Of these, non-oxide porous fired bodies such as silicon carbide or silicon nitride are particularly desirable.
Since these porous fired bodies are brittle materials, they are easily broken by a mechanical impact or the like. However, by wrapping the holding sealing material around the side surface of the exhaust gas treatment body, it becomes easy to absorb the impact, so that it is possible to prevent the exhaust gas treatment body from being cracked by a mechanical impact or thermal shock. .

The exhaust gas treating body may carry a catalyst for purifying exhaust gas. As the catalyst to be carried, for example, a noble metal such as platinum, palladium, rhodium or the like is desirable, and among these, platinum is more desirable. In addition, as other catalysts, for example, alkali metals such as potassium and sodium, and alkaline earth metals such as barium can be used. These catalysts may be used alone or in combination of two or more. When these catalysts are supported, it is easy to burn and remove PM, and toxic exhaust gas can be purified.

The exhaust gas treatment body may be an integrally formed honeycomb structure made of cordierite or the like, or may be made of silicon carbide or the like, and a large number of through holes may be arranged in the longitudinal direction with partition walls therebetween. It may be a collective honeycomb structure formed by binding a plurality of provided columnar honeycomb fired bodies mainly through a paste containing ceramic.

In the exhaust gas treating body, the end portion of the cell may not be sealed without providing the cell with the sealing material. In this case, the exhaust gas treating body functions as a catalyst carrier that purifies harmful gas components such as CO, HC, or NOx contained in the exhaust gas by supporting a catalyst such as platinum.

FIG. 4 is a perspective view schematically showing how the wound body of the present invention is press-fitted into the casing.
When press-fitting the wound body of the present invention into the casing, the holding sealing material is press-fitted into the casing with the first long side as the head.
FIG. 4 schematically shows a state in which the wound body 140 is press-fitted into the casing 130 with the first long side 21 side of the holding sealing material 10 as the head.
When press-fitting the wound body of the present invention into the casing, press-fitting is performed with the first long side of the holding sealing material as the head.
When press-fitting, a press-fitting jig may be used. When using a press-fitting jig, prepare a press-fitting jig whose inside expands in a tapered shape from the short-diameter end to the long-diameter end, and fit the short-diameter end of the press-fitting jig into one end of the casing. And press-fitting the wound body from the long-diameter side end portion side of the press-fitting jig with the first long side of the holding sealing material as the head.

The material of the casing is not particularly limited as long as it is a metal having heat resistance, and specific examples include metals such as stainless steel, aluminum, and iron.
Moreover, as for the shape of the casing, a clamshell shape, a substantially elliptical shape, a substantially polygonal shape, etc. can be suitably used in addition to the substantially cylindrical shape.

Next, the exhaust gas purification apparatus of the present invention will be described.
FIG. 5 is a cross-sectional view schematically showing an example of the exhaust gas purifying apparatus of the present invention.
As shown in FIG. 5, the exhaust gas purification apparatus 100 of the present invention includes a casing 130, an exhaust gas treatment body 120 accommodated in the casing 130, and the holding sealing material 10 disposed between the exhaust gas treatment body 120 and the casing 130. And.
The exhaust gas treatment body 120 has a columnar shape in which a large number of cells 125 are arranged in parallel in the longitudinal direction with a cell wall 126 therebetween. Note that an end of the casing 130 is connected to an introduction pipe for introducing exhaust gas discharged from the internal combustion engine and an exhaust pipe for discharging the exhaust gas that has passed through the exhaust gas purification device to the outside, if necessary. It becomes.

The case where the exhaust gas passes through the exhaust gas purification apparatus 100 having the above-described configuration will be described below with reference to FIG.
As shown in FIG. 5, the exhaust gas discharged from the internal combustion engine and flowing into the exhaust gas purification device 100 (in FIG. 5, the exhaust gas is indicated by G and the flow of the exhaust gas is indicated by an arrow) is an exhaust gas treatment body (honeycomb filter) 120. Flows into one cell 125 opened in the exhaust gas inflow side end face 120 a and passes through the cell wall 126 separating the cells 125. At this time, PM in the exhaust gas is collected by the cell wall 126, and the exhaust gas is purified. The purified exhaust gas flows out from another cell 125 opened in the exhaust gas outflow side end face 120b and is discharged to the outside.
In the exhaust gas purification apparatus 100 shown in FIG. 5, the holding sealing material 10 is the holding sealing material of the present invention.

Most of the exhaust gas that has flowed into the exhaust gas purification apparatus flows into the cells of the exhaust gas treatment body, but some of them collide with the side surfaces of the holding sealing material. Here, as shown in FIG. 2, since there is a slight gap between the first short side and the second short side in the wound body, it is considered that the exhaust gas flows into this gap. .

FIG. 6 (a) is an explanatory view schematically showing the flow of exhaust gas flowing into the gap formed between the first short side and the second short side in the exhaust gas purification apparatus using the holding sealing material of the present invention. FIG. 6B is an explanatory diagram schematically showing the flow of the exhaust gas flowing into the gap formed between the first short side and the second short side when the angle β is a right angle.

In the exhaust gas purification apparatus using the holding sealing material of the present invention, since the angle β shown in FIG. 6A exceeds 105 °, the direction G of the gap between the direction G into which the exhaust gas flows and the side 31a and the side 32a. Becomes diagonal rather than parallel. Therefore, the exhaust gas hardly flows into the gap. The amount of the exhaust gas flowing into the gap is small, and even if the exhaust gas flows into the gap, the speed is slowed down when reaching the first vertex 42a, so that it is held near the first vertex 42a. Wind erosion of the sealing material is prevented.
On the other hand, when the angle β is a right angle as shown in FIG. 6B, the direction G of the exhaust gas flows in and the direction of the gap between the side 31a ′ and the side 32a ′ becomes parallel, so the exhaust gas flows into the gap. It reaches the first vertex 42a 'while maintaining a high speed. Therefore, wind erosion of the holding sealing material is likely to occur in the vicinity of the first vertex 42a ′. Moreover, in the form of FIG.6 (b), compared with the form of Fig.6 (a), since the distance from the point into which waste gas flows into the said gap | interval to the 1st vertex 42a 'is short, even if it is the 1st vertex Even if 42a ′ has an R corner shape, the distance does not change so much, and the exhaust gas easily leaks to the outside.

Hereinafter, an example of a method for producing the holding sealing material of the present invention will be described.
First, a mat containing inorganic fibers is produced. The mat can be obtained by various methods. For example, the mat can be produced by a needling method or a papermaking method.
In the case of the needling method, for example, it can be produced by the following method. That is, first, for example, an inorganic fiber precursor having an average fiber diameter of 3 to 10 μm is prepared by spinning a spinning mixture using a basic aluminum chloride aqueous solution and silica sol as raw materials by a blowing method. Subsequently, the inorganic fiber precursor is compressed to produce a continuous sheet-like material having a predetermined size, and the preparation of the mat is completed by performing a baking treatment. At this time, a needle punching process may be performed before the baking process.

In the case of the papermaking method, by mixing inorganic fibers such as alumina fibers and silica fibers, an inorganic binder, and water so that the content of the inorganic fibers in the raw material liquid becomes a predetermined value, and stirring with a stirrer Prepare a mixture. The mixed solution may contain a colloidal solution made of a polymer compound or a resin as necessary. Then, after pouring a liquid mixture into the molding machine with which the mesh for filtration was formed in the bottom face, the raw material sheet | seat is produced by dehydrating the water in a liquid mixture through a mesh. Thereafter, the preparation of the mat is completed by heating and compressing the raw material sheet under predetermined conditions.

If necessary, the mat may be subjected to a drying treatment by applying a binder solution containing an organic binder and / or an inorganic binder.
Examples of the organic binder include acrylic resins, acrylate latex, rubber latex, water-soluble organic polymers such as carboxymethyl cellulose or polyvinyl alcohol, thermoplastic resins such as styrene resins, thermosetting resins such as epoxy resins, and the like. .
The content of the organic binder is desirably 0.5 to 2% by weight with respect to 100% by weight of the holding sealing material.
The content of the organic binder in the holding sealing material can be obtained as a weight reduction rate before and after heating the holding sealing material at 600 ° C./1 hour.
Examples of the inorganic binder include inorganic particles as solid components obtained by removing a solvent from an inorganic particle solution such as an inorganic sol dispersion solution.
The inorganic sol dispersion solution (inorganic particle solution) is not particularly limited, and examples thereof include alumina sol and silica sol.
As the inorganic particles, alumina particles derived from alumina sol and silica particles derived from silica sol are preferable.
The amount of the inorganic binder is preferably 0.5 to 2 parts by weight with respect to 100 parts by weight of the inorganic fiber.
As the drying treatment, methods such as aeration drying and compression drying using a hot plate can be used.
If drying with a hot plate is performed, the distribution of the binder impregnated in the mat becomes uniform in the thickness direction, which is advantageous for mats for papermaking with poor formability of thickness.

Since the mat is obtained as one large sheet-like member, the holding sealing material of the present invention can be obtained by cutting the mat into the shape of the holding sealing material.
The holding sealing material can be cut using a Thomson blade, a guillotine blade, a laser, a water jet, or the like. The above cutting method may be used as appropriate depending on the situation, but a Thomson blade or a guillotine blade is preferable if mass processing is important, and a laser or a water jet is preferable if cutting accuracy is important.

Another example of the holding sealing material of the present invention will be described below.
7, 8 and 9 are plan views schematically showing another example of the holding sealing material of the present invention.
The holding sealing material 210 shown in FIG. 7 has the same shape as the holding sealing material 10 shown in FIGS. 1A and 1B except that the angle γ and the angle δ are not 90 ° but an obtuse angle. .
Specifically, a side (straight line) 231e connecting the second vertex 242d of the convex portion 241 and the second long side 222 of the holding sealing material 210, and an outer periphery of the convex portion 241 extending from the second vertex 242d. Of the angles formed with the side 231d constituting a part, the angle γ located outside the holding sealing material 210 is an obtuse angle.
Of the angles formed by the second long side 222 and the side (straight line) 231e connecting the second vertex 242d of the convex portion 241 and the second long side 222, the angle located in the holding sealing material δ is an obtuse angle.
It is desirable that the angle γ and the angle δ be greater than 105 ° and less than 180 °.
The shape of the second short side 232 matches the shape of the first short side 231 so as to be fitted to the first short side 231 when the holding sealing material 210 is wound around the columnar exhaust gas treatment body. It has a different shape.

The holding sealing material 310 shown in FIG. 8 is the same as FIG. 1A except that the first long side 321 and the side 331b that extends from the first vertex 342a and forms a part of the outer periphery of the convex portion 341 are not parallel. And it is the shape similar to the holding sealing material 10 shown in FIG.1 (b).
In the holding sealing material 310 shown in FIG. 8, the side (straight line) 331a connecting the first vertex 342a of the convex portion 341 and the first long side 321 and the outer periphery of the convex portion 341 extending from the first vertex 342a. Of the angles formed with the side 331b constituting a part, the angle α located outside the holding sealing material 310 and the side (straight line) connecting the first vertex 342a of the convex portion 341 and the first long side 321 Of the angles formed by 331a and the first long side 321, the angle β positioned in the holding sealing material is not the same angle.
The shape of the second short side 332 matches the shape of the first short side 331 so that it fits with the first short side 331 when the holding sealing material 310 is wound around the columnar exhaust gas treatment body. It has a different shape.

The holding sealing material 410 shown in FIG. 9 has the same shape as the holding sealing material 10 shown in FIGS. 1A and 1B except that the angle γ and the angle δ are not 90 ° but acute angles. .
Specifically, a side (straight line) 431e connecting the second vertex 442d and the second long side 422 of the convex portion 441 of the holding sealing material 410, and an outer periphery of the convex portion 441 extending from the second vertex 442d. Of the angles formed with the side 431d constituting a part, the angle γ located outside the holding sealing material 410 is an acute angle.
Further, of the angles formed by the side (straight line) 431e connecting the second vertex 442d of the convex portion 441 and the second long side 422 and the second long side 422, the angle located in the holding sealing material δ is an acute angle.
The shape of the second short side 432 matches the shape of the first short side 431 so that it fits with the first short side 431 when the holding sealing material 410 is wound around the columnar exhaust gas treatment body. It has a different shape.

The wound sealing material of the present invention can also be obtained by winding the holding sealing material shown in any of FIGS. 7, 8 or 9 around the side surface of the exhaust gas treating body, and the wound body is press-fitted into the casing. By doing so, the exhaust gas purifying apparatus of the present invention can be obtained. The configuration of the wound body and the exhaust gas purification device is the same as that of the wound body and the exhaust gas purification device shown in FIGS. 2 and 5 except that the configuration of the holding sealing material is different.

Below, the effect of the holding sealing material of this invention, a wound body, and an exhaust gas purification apparatus is demonstrated.

(1) In the holding sealing material of the present invention, a straight line connecting the first vertex of the convex portion and the first long side, and a side extending from the first vertex and constituting a part of the outer periphery of the convex portion Of the angles formed, the angle α located outside the holding sealing material is more than 105 ° and less than 180 °. For this reason, stress is prevented from concentrating on the first apex of the convex portion during press-fitting of the wound body of the present invention using the holding sealing material of the present invention, and cracks are prevented from occurring in the holding sealing material during press-fitting. The

(2) In the holding sealing material of the present invention, it is located in the holding sealing material among the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side. The angle β is greater than 105 ° and less than 180 °. Therefore, in the exhaust gas purifying apparatus using the holding sealing material of the present invention, the direction of the gap formed between the convex portion and the concave portion and the direction in which the exhaust gas flows are not parallel but sufficiently inclined. Exhaust gas flowing into the gap formed between them concentrates on a specific part and becomes difficult to hit, and wind erosion is prevented.
Therefore, wind erosion of the holding sealing material due to the exhaust gas flowing into the gap formed between the convex portion and the concave portion is prevented.

(Example)
Examples in which the present invention is disclosed more specifically are shown below. In addition, this invention is not limited only to these Examples.

(Matte production example)
First, a mat containing inorganic fibers was prepared by the following procedure.
A substrate mat having a composition ratio of Al ₂ O ₃ : SiO ₂ = 72: 28 (weight ratio) was prepared as an alumina fiber-based substrate mat having an alumina-silica composition. A needle processing mat having a weight per unit area of 1500 g / m ² and a thickness of about 10 mm was produced by performing a needling process on the base mat.

Separately, an acrylic latex emulsion was prepared by sufficiently dispersing acrylic latex in water, and this was used as a binder.

Next, the needle mat is cut into a total length of 1250 mm × width of 1200 mm in a plan view, and the binder needle is impregnated into the binder so that the amount of binder attached to 100% by weight of the cut needle mat is 1.0% by weight. did.

Thereafter, the needle mat impregnated with the binder was air-dried at a temperature of 140 ° C. for 6 minutes to produce a mat as one sheet.
The mat thickness was 8.0 mm.

(Stress evaluation test)
The stress applied to the convex part at the time of press-fitting was evaluated by the following procedure.
FIG. 10A to FIG. 10E are plan views showing the shapes of test pieces used in the stress evaluation test. Each test piece has a shape imitating the shape around the convex portion, and is a test piece in which the angle α is changed to 90 °, 105 °, 120 °, 135 °, and 150 °, respectively.
In FIG. 10A to FIG. 10E, the dimension of each side is indicated by (mm).
FIG. 11 is a perspective view schematically showing how the stress evaluation test is performed.

First, the mat was cut so that the plan view thereof had the shape shown in FIGS. 10 (a) to 10 (e) to prepare a test piece.
Each test piece was placed on a stand as shown in FIG. 11 and fixed by being sandwiched by heavy objects from both sides of the test piece. FIG. 11 schematically shows the state of the test when the test piece shown in FIG.
Each test piece is arranged so that the convex part protrudes from the table, and is the middle point of the side constituting the convex part (the side corresponding to the side extending from the first vertex and constituting a part of the outer periphery of the convex part) A weight fixed with a string was hung on (a point of 20 cm out of a side length of 40 cm), and a load was applied to the convex portion. The direction of the load is the direction of the force imitating the direction of the stress applied to the convex portion during press fitting.
In the stress evaluation test, each test piece was tested by changing the weight of the weight.
Examples using test pieces with an angle α of 120 °, 135 °, and 150 ° are Examples 1, 2, and 3, respectively, and examples using test pieces with an angle α of 90 ° and 105 ° are respectively compared. Examples 1 and 2.

The results of the stress evaluation test are summarized in Table 1.
The meanings of the symbols in Table 1 are as follows.
○: No breakage occurred even when a load was applied.
(Triangle | delta): The fracture | rupture occurred in the convex part after about 20 second progress.
X: The convex part was broken immediately after the load was applied.

From the results shown in Table 1, in Comparative Examples 1 and 2 in which the angle α is 90 ° or 105 °, the fracture occurred immediately when a load of 1.11 kg was applied to the convex portion, and the stress was concentrated during press-fitting. It was confirmed to do. On the other hand, in Examples 1 to 3 in which the angle α exceeds 105 °, the applied load is considered to be dispersed, and it was confirmed that the load has durability against the load.
From the above results, the holding sealing material of the present invention having a large angle α exceeding 105 ° is considered to be a holding sealing material suitable for preventing stress from concentrating on the first vertex of the convex portion during press-fitting. It is done.

Holding sealing material 10, 210, 310, 410
First long side 21,321
Second long side 22, 222, 422
First short side 31, 231, 331, 431
Straight lines 31a and 331a connecting the first vertex of the convex portion and the first long side
Sides 31b and 331b that extend from the first vertex and constitute part of the outer periphery of the convex portion
Sides 31d, 231d, and 431d that extend from the second vertex and constitute a part of the outer periphery of the convex portion
Straight lines 31e, 231e, 431e connecting the second vertex of the convex part and the second long side
Second short side 32, 232, 332, 432
Convex 41, 241, 341, 441
First vertex 42a, 342a
Second vertex 42d, 242d, 442d
Recess 43
Exhaust gas purification device 100
Exhaust gas treatment body 120
Casing 130
Wrap 140

Claims (9)

In the plan view shape, the first long side and the second long side that extend in the longitudinal direction, and the first short side and the second short side that connect the first long side and the second long side, respectively. It is a holding seal material used for an application having a side, consisting of a substantially rectangular mat in plan view, wound around a side surface of a columnar exhaust gas treatment body and press-fitted into a casing as a wound body,
The first long side is a portion that first enters the casing when press-fitting the wound body into the casing,
The first short side has a polygonal convex portion, the second short side has a polygonal concave portion corresponding to the shape of the convex portion, and the first short side The convex portion and the concave portion are configured to fit each other when the holding sealing material is rolled into a cylindrical shape so that the side and the second short side are in contact with each other,
The first vertex that is the vertex closest to the first long side among the vertexes of the polygon that forms the convex portion is connected to the first long side by a single straight line,
Retained among angles formed by a straight line connecting the first vertex of the convex portion and the first long side and a side extending from the first vertex and constituting a part of the outer periphery of the convex portion. The angle α located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 °. A holding sealing material characterized by being less than 180 °. The holding according to claim 1, wherein the first long side and a side extending from the first vertex and constituting a part of the outer periphery of the convex portion are parallel, and the angle α and the angle β are equal. Seal material. From the second vertex that is the vertex closest to the second long side among the polygonal vertices constituting the convex portion, the second long side is connected by a single straight line,
The second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex portion are parallel to each other,
Retained among angles formed by a straight line connecting the second vertex of the convex portion and the second long side and a side extending from the second vertex and forming a part of the outer periphery of the convex portion. The angle γ located outside the sealing material is a right angle, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material is a right angle. Item 3. The holding sealing material according to Item 1 or 2. From the second vertex that is the vertex closest to the second long side among the polygonal vertices constituting the convex portion, the second long side is connected by a single straight line,
Retained among angles formed by a straight line connecting the second vertex of the convex portion and the second long side and a side extending from the second vertex and forming a part of the outer periphery of the convex portion. The angle γ located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material exceeds 105 °. The holding sealing material according to claim 1 or 2, which is less than 180 °. A columnar exhaust gas treatment body;
It is composed of a holding sealing material wound around the side surface of the exhaust gas treating body and having a substantially rectangular shape in plan view,
A wound body used for press-fitting in a casing,
The holding sealing material is
In the plan view shape, the first long side and the second long side that extend in the longitudinal direction, and the first short side and the second short side that connect the first long side and the second long side, respectively. It consists of a mat that has a side and a substantially rectangular shape in plan view.
The first long side is a portion that first enters the casing when press-fitting the wound body into the casing,
The first short side has a polygonal convex portion, the second short side has a polygonal concave portion corresponding to the shape of the convex portion, and the first short side The convex portion and the concave portion are configured to fit each other when the holding sealing material is rolled into a cylindrical shape so that the side and the second short side are in contact with each other,
The first vertex that is the vertex closest to the first long side among the vertexes of the polygon that forms the convex portion is connected to the first long side by a single straight line,
Retained among angles formed by a straight line connecting the first vertex of the convex portion and the first long side and a side extending from the first vertex and constituting a part of the outer periphery of the convex portion. The angle α located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the first long side and the straight line connecting the first vertex of the convex portion and the first long side, the angle β located in the holding sealing material exceeds 105 °. A wound body characterized by being less than 180 °. The first long side of the holding sealing material and a side that extends from the first vertex and forms a part of the outer periphery of the convex portion are parallel, and the angle α and the angle β are equal. Item 6. A wound body according to Item 5. The holding sealing material is connected by a single straight line from the second vertex, which is the vertex closest to the second long side, of the polygonal vertices constituting the convex portion. Has been
The second long side and a side extending from the second vertex and constituting a part of the outer periphery of the convex portion are parallel to each other,
Retained among angles formed by a straight line connecting the second vertex of the convex portion and the second long side and a side extending from the second vertex and forming a part of the outer periphery of the convex portion. The angle γ located outside the sealing material is a right angle, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material is a right angle. Item 7. A wound body according to item 5 or 6. The holding sealing material is connected by a single straight line from the second vertex, which is the vertex closest to the second long side, of the polygonal vertices constituting the convex portion. Has been
Retained among angles formed by a straight line connecting the second vertex of the convex portion and the second long side and a side extending from the second vertex and forming a part of the outer periphery of the convex portion. The angle γ located outside the sealing material is more than 105 ° and less than 180 °, and
Of the angles formed by the second long side and the straight line connecting the second vertex of the convex portion and the second long side, the angle δ located in the holding sealing material exceeds 105 °. The wound body according to claim 5 or 6, wherein the wound body is less than 180 °. An exhaust gas purifying apparatus comprising the wound body according to any one of claims 5 to 8 press-fitted into a casing, and comprising a gas inflow side end portion into which exhaust gas flows and a gas outflow side end portion from which exhaust gas flows out. ,
The exhaust gas purifying apparatus, wherein the first long side of the holding sealing material is located on a gas inflow side end portion side of the exhaust gas purifying apparatus.

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