JP6386342B2 - Method for manufacturing exhaust gas purification device - Google Patents

Description

The present invention relates to a method for manufacturing an exhaust gas purification apparatus . In particular, a method of manufacturing an exhaust gas purifying equipment using the holding sealing material for holding the exhaust gas treating body for purifying exhaust gas discharged from an internal combustion engine such as an automobile engine.

Exhaust gas discharged from internal combustion engines such as diesel engines and gasoline engines contains PM (particulate matter), and in recent years, it has been a problem that this PM adversely affects the human body and the environment. Also, in the exhaust gas, CO, HC, since it is also contain toxic gas components such as NO _x. There are also concerns about the effects of this harmful gas component on the human body and the environment.

  Therefore, as an exhaust gas purification device that repairs PM in exhaust gas or purifies harmful gas components, an exhaust gas treatment body made of porous ceramics such as silicon carbide and cordierite, and a casing that houses the exhaust gas treatment body, Various exhaust gas purifying apparatuses composed of a holding sealing material made of an inorganic fiber aggregate disposed between an exhaust gas treating body and a casing have been proposed. 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.

  In addition, the exhaust gas purification device is required to have a heat retaining performance for keeping the exhaust gas treating body warm in order to effectively function the exhaust gas treating performance of the exhaust gas treating body. In the DPF (diesel particulate filter) for capturing PM described above, when the regeneration process for burning the PM accumulated in the filter is performed, the PDF is kept warm, so that the PM is burned effectively. be able to. Further, in the exhaust gas treating body having a catalytic function, excessive fuel injection is required to keep the temperature above the catalyst activation temperature. However, by keeping the exhaust gas treating body warm, fuel injection can be suppressed, and fuel consumption can be reduced. Can be improved.

  A holding sealing material that is disposed between the exhaust gas treating body and the casing and holds the exhaust gas treating body in the casing has been conventionally used in a flat plate-like holding sealing material in order to be wrapped around and attached to the exhaust gas treating body. In order to fit both ends, for example, as shown in Patent Document 1 or the like, a concave-convex or L-shaped fitting portion is formed at both ends. Further, the holding sealing material is wound around the exhaust gas treating body and then fixed with a tape or the like.

However, with the holding sealing material in which the concave and convex or L-shaped fitting parts are formed at both ends as described above, it is necessary to fix the fitting part with tape or the like after winding around the exhaust gas treatment body. It was. For this reason, there has been a problem that it takes time and effort to wind and attach the exhaust gas treating body and the DPF.
Further, the heat capacity of such a holding sealing material hinders the heating of the exhaust gas treating body, which is disadvantageous for the early activation of the exhaust gas treating body after the engine is started.

JP 2002-66331 A

  Therefore, the present invention provides a heat insulating performance as a holding sealing material for holding the exhaust gas treating body in the casing, has good workability without causing a shift when attached to the exhaust gas treating body, and is initially warmed up. An object of the present invention is to provide a holding sealing material having excellent heat retention.

  The holding sealing material of the present invention is composed of a woven structure in which a plurality of strip-shaped mat members containing inorganic fibers are interwoven, and the plurality of strip-shaped mat members are a first strip group extending in a first direction; The textile structure is composed of a part of the strip-shaped mat material in the first group of strips and a part of the strip-shaped mat in the group of the second strips. The material appears alternately on the surface of the woven structure.

In the holding sealing material of the present invention, the strip-shaped mat material may be needle punched.
The holding sealing material of the present invention may further contain an inorganic binder.
In the holding sealing material of the present invention, the inorganic fiber may contain alumina and / or silica.
In the holding sealing material of the present invention, a plurality of woven structures may be laminated.
In the holding sealing material of the present invention, a fiber scattering suppressing portion may be provided on at least a part of the surface of the strip-shaped mat material.

In the holding sealing material of the present invention, the woven structure may be cylindrical.
In the holding sealing material of the present invention, the width of the strip-shaped mat material may be 5 to 50 mm.
In the holding sealing material of the present invention, the strip-shaped mat material may have a thickness of 1 to 25 mm.
In the holding sealing material of the present invention, the width of the gap in which the plurality of strip-shaped mat members are adjacent to each other may be 0.5 to 30 mm.

The method for producing a holding sealing material of the present invention includes a step of producing a plurality of strip-shaped mat members containing inorganic fibers, and a plurality of strip-shaped mat materials in a second direction intersecting the first direction and the first direction. And interweaving so that some strip mat materials in the first strip group and some strip mat materials in the second strip group appear alternately on the surface. It is.
In the manufacturing method of the holding sealing material of the present invention, the step of producing the strip-shaped mat material may include a step of cutting the roll-shaped mat material into a predetermined width.

The exhaust gas purifying apparatus of the present invention includes an exhaust gas treatment body, a casing that accommodates the exhaust gas treatment body, and a holding seal material that is disposed between the exhaust gas treatment body and the casing. It may be a holding sealing material.
An exhaust gas purification apparatus manufacturing method according to the present invention includes an exhaust gas treatment body, a casing that houses the exhaust gas treatment body, and a holding sealing material that is disposed between the exhaust gas treatment body and the casing. A step of producing a plurality of strip-like mat members containing inorganic fibers, and a plurality of strip-like mat members are interwoven in a first direction and a second direction intersecting the first direction, A step of producing a holding sealing material comprising a tubular woven structure in which a part of the strip-shaped mat material in the strip group and a part of the strip-shaped mat material in the second strip group appear alternately on the surface, and exhaust gas A step of covering the treatment body with the holding sealing material, a step of pulling the holding sealing material in the longitudinal direction of the exhaust gas treatment body, and bringing the holding seal material into close contact with the exhaust gas treatment body, and the holding seal material and the exhaust gas treatment body into the casing A housing step.

  As a holding sealing material for holding the exhaust gas treating body in the casing, it is possible to provide a holding sealing material that is excellent in the mounting property to the exhaust gas treating body and is excellent in heat retention, particularly in the initial warm-up.

1A and 1B show a holding sealing material according to an embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG. 2 schematically shows a state in which the holding sealing material of one embodiment of the present invention is wound around the exhaust gas treating body, (a) shows a state before winding and before stretching, and (b) shows stretching. Shown later. FIG. 3 shows an image of a heat transfer state by the holding sealing material of one embodiment of the present invention. FIG. 4 shows a structure for fixing the end portion of the holding sealing material according to the embodiment of the present invention. (A) shows a structure using a string and (b) shows a structure using a pin. FIG. 5 shows an exhaust gas purification apparatus according to an embodiment of the present invention, (a) shows an external view of the exhaust gas purification apparatus, and (b) shows a cross-sectional view taken along line AA of FIG. FIG. 6 is a photograph of the holding sealing material according to one embodiment of the present invention, in which (a) shows a state wound around the exhaust gas treating body, and (b) shows a folded state during storage. FIG. 7 shows the shape and dimensions of the exhaust pipe used in the examples.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a plan view (a) and a sectional view (b) of the holding sealing material of the present invention. As shown to Fig.1 (a), the holding | maintenance sealing material of this embodiment is comprised from the textile fabric structure by which the several strip-shaped mat materials 11-24 containing an inorganic fiber were interwoven. In FIG. 1 (a), the plurality of strip-shaped mat members are first strip groups 11, 12, 13, and 14 extending in the first direction and second strip groups 21, 22, and 23 that intersect the first direction. , 34. As shown in FIG. 1B, a part of the strip-shaped mat members 11, 12, 13, 14 in the first strip group and a part of the strip-shaped mat member 23 in the second strip group are woven structures. It appears alternately on the surface of the body.

  A part of the strip-shaped mat means that the strip-shaped mat includes a case where the number of the strip-shaped mat is one and a plurality of the knitted rows. In FIG. 1, the strip-shaped mat in the first direction and the strip-shaped mat in the second direction are used. Is shown alternately on the surface one by one, but a plurality of parallel strip-like mats may alternately appear on the surface. As described above, the structure in which strip-like mats appear alternately on the surface of the woven structure forms irregularities on the surface, and is less likely to be displaced due to friction when the exhaust gas treating body is attached. Moreover, the woven fabric structure formed in this way has elasticity, and it becomes easy to adhere | attach and fix to an exhaust gas treatment body by extending in a longitudinal direction after winding around an exhaust gas treatment body.

  The strip-shaped mat member constituting the holding sealing material contains inorganic fibers. Although it does not specifically limit as an inorganic fiber, For example, an alumina fiber, an alumina-silica fiber, a silica fiber, a biosoluble fiber etc. are mentioned. By using such an inorganic fiber, the strip-shaped mat has excellent holding properties and excellent mechanical properties of the inorganic fiber, so that the mat is not easily cracked or crushed. Holds firmly.

  In the holding sealing material according to the embodiment of the present invention, the strip-shaped mat material can be needle punched. Needle punching means that fiber entanglement means such as a needle is inserted into and removed from the base mat. By subjecting the mat material to a needle punch treatment, entanglement of inorganic fibers occurs, and the strength of the mat is improved. Therefore, cracks and crushing are less likely to occur in the mat.

The strip-shaped mat material of one embodiment of the present invention can be manufactured using, for example, a papermaking method. The paper making method is usually called wet processing, and a holding sealing material is manufactured through fiber mixing, stirring, fiber opening, slurrying, paper making, and compression drying, as in the so-called “paper making”. It is a processing method.
First, a predetermined amount of inorganic fiber raw material and a binder are put in water and mixed. As the inorganic fiber raw material, for example, a raw cotton bulk of a mixed fiber of alumina and silica is used. However, the inorganic fiber material is not limited to this, and may be composed only of alumina or silica, for example. As the inorganic binder, for example, alumina sol and silica sol are used. Further, latex or the like can be used as the organic binder.

Next, the obtained mixture is stirred in a mixer such as a paper machine to prepare a spread slurry. Usually, the stirring and opening process is performed for about 20 seconds to 120 seconds. Thereafter, the obtained slurry is put into a molding machine to be molded into a desired shape, and further dewatered to obtain a raw mat for a strip mat material.
Furthermore, the mat material can be obtained by compressing the raw material mat using a press or the like, and heating and drying at a temperature of 90 to 150 ° C., for example. Note Usually, the compression process, the density of the holding sealing material after compression is performed such that the 0.10g ^/ cm ³ ~0.40g ^/ cm 3 order.
A strip-shaped mat material can be obtained by cutting the mat material thus manufactured.

The holding sealing material may be a single layer of the woven structure or may be configured by laminating a plurality of layers. When a plurality of layers are stacked, the positional relationship between the portion where the strip-like mat appears on the surface and the portion where it does not appear in the upper and lower layers may be shifted.
In the holding sealing material according to one embodiment of the present invention, a fiber scattering suppressing portion may be provided on at least a part of the surface of the strip-shaped mat material. When the strip mat is formed by cutting a mat material, inorganic fibers may be scattered from the end face (side face) of the cut portion. For this reason, a scattering suppression part can be provided in part or all of the surface of a strip-shaped mat. Examples of the method for forming the scattering suppression part include a method of vapor-depositing and bonding an aluminum foil on the surface of the mat material and then cutting it into a strip-shaped mat, or applying an inorganic binder to part or all of the surface of the strip-shaped mat. There are ways to do it. Examples of the inorganic binder include ordinary colloidal silica, alumina sol, titania sol and the like.

  The woven structure of the holding sealing material may be cylindrical. By weaving the strip-shaped mat material into a tubular shape, the exhaust gas treating body can be easily mounted by inserting it into the tubular woven fabric structure. Since the holding sealing material is composed of a woven fabric structure in which a plurality of strip-shaped mat members containing inorganic fibers are interwoven, it can be easily and flexibly attached to the exhaust gas treating body. As shown in FIG. 2 (a), the exhaust gas treating body 25 can be inserted into the woven fabric structure 26. After the insertion, as shown in FIG. By stretching in the axial direction of the body, it can be brought into close contact with the exhaust gas treating body.

  The woven structure of the holding sealing material may be plate-shaped. In the case of a plate shape, the woven structure may be wound around the exhaust gas treatment body. For example, after winding, the ends of the woven structure may be bonded to an adhesive or the like and then stretched, or may be stretched in the longitudinal direction and fixed with a tape or the like. However, the catalyst carrier and the DPF are increasing in size, and it is preferable to form a knitted structure that is previously knitted into a cylindrical shape because the work is troublesome when it is attached by winding.

  Although the width | variety of the strip-shaped mat material which comprises a holding sealing material, thickness, and the clearance gap between strip-shaped mats can be determined suitably, for example, a width | variety can be 5-50 mm and thickness can be 1-25 mm. The width of the strip-shaped mat may be different between the first direction and the second direction. Moreover, the width | variety of the clearance gap between strip-shaped mat materials can be 0.5-30 mm. In particular, the stretchability of the holding sealing material can be adjusted by the relationship between the width of the strip-shaped mat material and the gap between the materials. This point will be described below with reference to FIG.

The fabric structure according to an embodiment of the present invention includes a plurality of strip-shaped mat members, a first strip group 1 extending in the first direction and a second strip group 2 intersecting the first direction. However, as shown in FIG. 2A, the longitudinal direction when covering the woven fabric structure 26 on the exhaust gas treatment body 25 is the X axis, the radial direction is the Y axis, and the angle between the X axis and the first direction is Let θ. If the width of all strip mats is uniformly d and the gap between all strip mats is uniformly s, the length of one side of the parallelogram formed by connecting four adjacent intersections is d + s. And the length of the diagonal line is
Length of diagonal line in X direction 2 (d + s) cos θ (1)
Length of diagonal line in Y direction 2 (d + s) sin θ (2)
It becomes.

Since the length of the diagonal line of the formula (2) is not less than or equal to the strip width, the current extension amount of the holding sealing material is the minimum angle θ _limit when it becomes the limit elongation,
2 (d + s) × (sin θ _limit ) = d (3)
θ _limit = sin ⁻¹ (d / 2 (d + s)) (4)
When the initial θ before stretching is θ ₀ , the elongation rate in the longitudinal direction of the fabric structure (the elongation rate in the longitudinal direction of the fabric structure when the maximum length of the strip mat (maximum elongation) is ( cos θ _limit ) / (cos θ ₀ ), and the reduction ratio in the radial direction of the woven fabric structure (reduction ratio of the width of the strip-shaped mat) is expressed by (sin θ _limit ) / (sin θ ₀ ).

  From the above, it can be seen that the shorter the width d of the strip mat and the larger the gap s between the strip mats, the easier the deformation. Therefore, by adjusting the width d of the strip-shaped mat and the gap s between the strip-shaped mats according to the shape and size of the exhaust gas treatment body, it is possible to design a woven structure suitable for the exhaust gas treatment body. However, when the gap s is large, it is necessary to consider that the covering area by the holding sealing material is reduced (opening ratio is increased) and the heat insulation is impaired.

The holding sealing material of the present invention is excellent in heat insulation when used in an exhaust gas purification device by using a woven structure. FIG. 3 shows an image of a heat transfer state when the woven structure holding sealing material is used in an exhaust gas purification device. The heat generated by the exhaust gas passing through the exhaust gas treating body 31 is transmitted from the exhaust gas treating body to the casing 33 through the woven structure 32 of the holding sealing material. As shown in FIG. 3, the woven fabric structure 32 has a smaller contact area with the exhaust gas treating body 31 and fewer contacts for heat to escape. In addition, the heat transfer from the intersection of the strip mats to the intersection increases. It becomes difficult to transfer heat. Here, if the width d of the strip mat and the gap s between the strip mats shown in FIG. 2 are used, the area ratio of the contact point between the exhaust gas treating body 31 and the holding sealing material 32 is d ² / (s + d) ² . By increasing the gap s, the contact area ratio can be reduced. Therefore, for example, in an exhaust gas purification apparatus for an automobile, the amount of heat taken away by the holding sealing material at the time of initial warm-up can be reduced.

The angle (the above θ ₀ ) with respect to the longitudinal direction of the tubular structure made of metal in the first direction and the second direction of the strip-shaped mat constituting the holding sealing material may be 45 °. Further, the same angle (the above θ ₀ ) may be less than 45 ° or may exceed 45 °.
The method for producing the holding sealing material includes a step of producing a plurality of strip-shaped mat members containing inorganic fibers, and a step of weaving the plurality of strip-shaped mat materials in a first direction and a second direction intersecting the first direction. And have. At this time, weaving is performed so that a part of the strip-shaped mat members in the first strip group and a part of the strip-shaped mat members in the second strip group appear alternately on the surface. A part of the strip-shaped mat means that the strip-shaped mat includes a single strip-shaped mat and a plurality of knitted rows. For example, the strip-shaped mat in the first direction and the strip-shaped mat in the second direction are combined. They may be woven so that they appear alternately on the surface one by one, or may be woven so that a plurality of parallel strip-like mats appear alternately on the surface. The step of producing the strip-shaped mat material may be produced by producing a mat material having a large area by the above-described method and cutting the mat material, or may be produced from the beginning in the shape of a strip-like mat. .

  A hook portion capable of fastening the fabric structure at the end portion may be provided in advance at the end portion of the fabric structure as the holding sealing material. As the hook portion, as shown in FIG. 4A, a string is inserted into the end 41 of the fabric structure. After the exhaust gas treatment body is inserted, the tubular fabric structure is inserted along the string. There is a method of fixing the exhaust gas treatment body by shrinking the end. In this case, the string 42 is not fixed to the end of the woven structure, but is movable in the longitudinal direction of the string.

  Further, the end portions of the strip-shaped mat constituting the woven structure may be separated from each other, and the string 41 shown in FIG. 4A is connected to the woven structure body in order to fix the end portions of the strip-shaped mat. You may form by fixing to the edge part 41 of (strip-shaped mat) with an adhesive agent etc. Alternatively, as shown in FIG. 4 (b), it may be fixed by a fastener (pin) 43 made of metal or the like. The end of the strip mat that constitutes the woven structure (end of the holding sealing material) may be disposed so as to protrude from the end of the exhaust gas treating body.

The holding sealing material may be provided with a structure that supplements the holding function. For example, a structure such as a wire mesh and a normal holding sealing material can be provided.
The holding sealing material can be disposed on a part or the entire surface of the exhaust gas treating body. Fig.5 (a) is a perspective view which shows typically an example of an exhaust gas purification apparatus. FIG.5 (b) is AA sectional view taken on the line of the exhaust gas purification apparatus 50 shown by Fig.5 (a). As shown in FIG. 5 (b), the exhaust gas purification device 50 includes an exhaust gas treatment body 51, a casing 52 that houses the exhaust gas treatment body 51, and a holding sealing material that is disposed between the exhaust gas treatment body 51 and the casing 52. 53 is a catalytic converter.
The holding sealing material 53 is wound around the exhaust gas processing body 51, and the exhaust gas processing body 51 is held in the casing 52 by the holding sealing material 53. An end of the casing 52 is connected to an introduction pipe for introducing the exhaust gas discharged from the internal combustion engine and a discharge pipe (not shown) from which the exhaust gas that has passed through the exhaust gas treatment body 51 is discharged to the outside as necessary. The

  The exhaust gas treating body 51 is usually mainly made of porous ceramic and has a substantially cylindrical shape. Further, the exhaust gas treating body 51 is a structure in which a large number of through holes are provided in the longitudinal direction with a partition wall therebetween. In the exhaust gas treating body 51, a catalyst for purifying harmful gas components such as CO, HC, NOx contained in the exhaust gas is supported on the partition walls of the honeycomb structure. As the catalyst, platinum or the like is used.

  The casing 52 constituting the exhaust gas purification device is usually made of a metal such as stainless steel and has a substantially cylindrical shape. The casing 52 may be provided with a hole (not shown) for penetrating the sensor. The inner diameter of the casing 52 is slightly shorter than the total length of the diameter of the end face of the exhaust gas treatment body 51 and the thickness of the holding sealing material wound around the exhaust gas treatment body. The length of the casing may be slightly longer than the length in the longitudinal direction of the exhaust gas treatment body, or may be substantially the same as the length in the longitudinal direction of the exhaust gas treatment body.

A method for manufacturing the exhaust gas purification apparatus will be described. The exhaust gas purifying apparatus includes an exhaust gas treatment body and a holding sealing material disposed on a part or all of the outside of the exhaust gas treatment body. The exhaust gas treating body wound around the holding sealing material is accommodated in the outer casing. The casing can be made of a metal such as stainless steel.
First, a plurality of strip-like mat members containing inorganic fibers are produced. In order to produce a strip-shaped mat material, it may be produced by producing a mat material having a large area by the above-described method and cutting the mat material, or may be produced in the shape of a strip-like mat from the beginning. .

  Next, a plurality of strip-shaped mat members are woven in a first direction and a second direction intersecting the first direction, and a part of the strip-shaped mat members in the first strip group and the second strip group A holding sealing material made of a cylindrical woven fabric structure in which some of the strip-shaped mat members appear alternately on the surface is prepared. At this time, weaving is performed so that a part of the strip-shaped mat members in the first strip group and a part of the strip-shaped mat members in the second strip group appear alternately on the surface. A part of the strip-shaped mat means that the strip-shaped mat includes a single strip-shaped mat and a plurality of knitted rows. For example, the strip-shaped mat in the first direction and the strip-shaped mat in the second direction are combined. They may be woven so that they appear alternately on the surface one by one, or may be woven so that a plurality of parallel strip-like mats appear alternately on the surface.

  Next, for example, after the exhaust gas treating body is covered with the holding sealing material, the holding sealing material is pulled in the longitudinal direction of the exhaust gas treating body, and the holding sealing material is brought into close contact with the exhaust gas treating body. Thereby, the holding sealing material can be fixed to the exhaust gas treating body. Then, the exhaust gas purification device can be obtained by housing the exhaust gas treating body in close contact with the holding sealing material in the casing.

Hereinafter, embodiments of the present invention will be described in detail based on examples.
A substrate mat having a composition ratio of Al ₂ O ₃ : SiO ₂ = 72: 28 was prepared as an alumina fiber substrate having an alumina-silica composition. This needle mat was subjected to a needling treatment to produce a needle-treated mat having a bulk density of 0.15 g / cm ³ and a basis weight of 430 g / cm ² . Next, the needle processing mat was cut into a total length of 900 mm and a width of 20 mm to obtain a strip-shaped mat.

In Example 1, a woven structure having a cylindrical structure with a diameter of 105 mm and a length of 110 mm was obtained by weaving the gap between the strip-like mats as 5 mm. In Examples 2-5, the same strip-shaped mats were used, and the woven fabric structure having a cylindrical structure with a diameter of 105 mm and a length of 100 mm with gaps between the strip-shaped mats being 10 mm, 20 mm, 50 mm, and 60 mm, respectively. Obtained. FIG. 6A shows a photograph of a normal woven fabric structure obtained in Example 2. Since this tubular woven structure is flattened as shown in FIG. 6B during packing or transportation, the stackability is good. For Example 6, two woven structures obtained in Example 1 were laminated and used as a holding sealing material.
In Comparative Example 1, a blanket (thickness 6 mm) cut into a rectangle (length 338 mm × width 117 mm) was used.

  The holding sealing materials of Examples 1 to 6 and Comparative Example 1 were mounted on an exhaust gas treating body composed of a cylindrical cordierite three-way catalyst having a diameter of 101.6 mm and a length of 127 mm, and the mounting properties were evaluated. Then, it installed in the exhaust pipe which has a cylindrical part and cone part shown by FIG. 7, and evaluated temperature rising property. The results are shown in Table 1. In Table 1, based on each evaluation index, ◎ indicates very high evaluation, ◯ indicates high evaluation, Δ indicates normal, and x indicates low evaluation.

(1) Wearability at the time of assembling The wear time at the time of attachment to the exhaust gas treatment body was evaluated as wearability. The time (mounting time) required from the start of mounting to mounting and fixing to the exhaust gas treatment body was measured and used as an evaluation index for mounting properties. The wearing time is less than 5 seconds, 、 ５ is 5 seconds or more and less than 10 seconds, ◯ is 10 seconds or more but less than 15 seconds, and 15 seconds or more are x.

(2) Temperature rise property A gas having a predetermined temperature of 600 ° C. flows into the assembled exhaust pipe, the temperature of the gas discharged from the exhaust pipe is measured, and the exhaust gas 30 seconds after the gas inflow (initial warm-up) The temperature was evaluated as the temperature rise property. The exhaust gas temperature during initial warm-up was 345 ° C. or higher, ◎, 340 ° C. or higher and lower than 345 ° C., 335 ° C. or higher and lower than 340 ° C.

As shown in Table 1, Examples 1 to 6 are highly evaluated for both wearability and temperature rise during initial warm-up, and in Examples 4 to 6 are particularly excellent in heat retention during initial warm-up. It was.
On the other hand, in the comparative example 1, the wearability was normal, and the evaluation of the temperature rise during initial warm-up was low.

DESCRIPTION OF SYMBOLS 1 1st strip group 2 2nd strip group 11 Strip-like mat of 1st strip group 12 Strip-like mat of 1st strip group 13 Strip-like mat of 1st strip group 14 Strip of 1st strip group -Like mat 22 Strip-like mat of second strip group 23 Strip-like mat of second strip group 24 Strip-like mat of second strip group 25 Exhaust gas treatment body 26 Textile structure (holding seal material)
31 Tubular structure made of metal (exhaust gas pipe)
32 Insulation (textile structure)
41 Strip mat 42 String 43 Pin 50 Exhaust gas purification device 51 Exhaust gas treatment body 52 Casing 53 Holding seal material s Gap between strip mats d Width of strip mat θ ₀ Angle between X axis and first direction (before stretching)
θ Angle between X axis and first direction (after stretching)

Claims (1)

An exhaust gas purification device comprising: an exhaust gas treatment body; a casing that houses the exhaust gas treatment body; and a holding sealing material that is disposed between the exhaust gas treatment body and the casing,
Producing a plurality of strip-like mat materials containing inorganic fibers;
The strip-shaped mat members in the first strip group and the second strip are woven by weaving the plurality of strip-shaped mat members in a first direction and a second direction intersecting the first direction. A step of producing a holding sealing material composed of a tubular woven structure in which some strip-shaped mat members in the group appear alternately on the surface;
Covering the exhaust gas treating body with the holding sealing material;
Pulling the holding sealing material in the longitudinal direction of the exhaust gas treating body, and bringing the holding sealing material into close contact with the exhaust gas treating body;
A method for manufacturing an exhaust gas purifying apparatus, comprising the step of housing the holding sealing material and the exhaust gas treating body in the casing.