JP4618547B2 - Film for sealing, and method for manufacturing honeycomb filter using the same - Google Patents

Description

  The present invention relates to a sealing film for sealing a channel end of a honeycomb structure and a method for manufacturing a honeycomb filter using the same.

  FIG. 6 is a schematic view of an example of a honeycomb filter that collects particulates in the exhaust gas of an automobile, where (a) is a front view and (b) is a cross-sectional view including a storage container. 6 (a) and 6 (b), the honeycomb filter 60 is made of porous ceramic, and has a plurality of flow paths 61c formed by an outer peripheral wall 61a and cell walls 61b orthogonal to each other inside the outer peripheral wall 61a. The honeycomb structure 61, the inflow side channel end 61d of the honeycomb structure 61, and the outflow side channel end 61e are alternately sealed with the sealing materials 62d and 62e. Further, the outer peripheral wall 61a of the honeycomb structure 61 is gripped so as not to move during use by gripping members 63a to 63c formed of a metal mesh or a ceramic mat, and is disposed in the metal storage container 64. .

  In the honeycomb filter 60 of FIG. 6, purification of exhaust gas is performed as follows. The exhaust gas 65a flows in from the flow path 61c opened to the flow path end 61d on the inflow side. Particulates contained in the exhaust gas 65a are captured when passing through the cell wall 61b (65b), and the purified exhaust gas 65c flows into the flow path 61c opened in the flow path end 61e on the outflow side. Spilled from the atmosphere and released into the atmosphere. On the other hand, when the particulate matter trapped in the cell wall 61b exceeds a certain amount, the honeycomb filter 60 is clogged. Therefore, the honeycomb filter 60 is burned by a burner or an electric heater, and the honeycomb filter 60 is regenerated.

  When the particulate matter captured by the honeycomb filter 60 is burned and regenerated, if the combustion heat is dissipated from the metal storage container 64, the regeneration of the honeycomb filter 60 may be difficult. In order to prevent this, as shown in FIGS. 5A and 5B, the inflow side flow path end 51d and the outflow side flow path end 51e are alternately sealed with the sealing materials 52d and 52e. In addition, a honeycomb filter 50 is proposed in which the same flow path 51c in the vicinity of the outer peripheral wall 51a is sealed with sealing materials 55d and 55e, and the sealed flow path 51c is used as a heat retaining space 55 (for example, Patent Document 1 ( JP, 5-118211, A). In addition, 51 is a honeycomb structure, 51b is a cell wall, D51 shows the outer diameter of the flow-path edge part 51f (51g).

  As shown in FIGS. 5 (a) and 5 (b), the applicant of the present invention also discloses, as Patent Document 2 (Japanese Patent Laid-Open No. 2003-126629), both end portions 51d and 51e of the flow path 51c in the vicinity of the outer peripheral wall 51a. 55d and 55e are sealed, and the length (L55) of the sealing material 55d and 55e from the end face of the honeycomb filter 50 is 8.2% or less of the total length (L51) of the honeycomb filter 50, and the outer peripheral wall 51a. A honeycomb filter 50 is proposed in which the flow path 51c sealing both ends in the vicinity has a length (B55) of 5 × (partition wall pitch) at the maximum from the outer peripheral wall 51a toward the center. According to Patent Document 2 of the present applicant, the length (L55) of the sealing materials 55d and 55e from the end face of the honeycomb filter 50 is 8.2% or less of the total length (L51) of the honeycomb filter 50, preferably By setting it as 3.3% or less, it can suppress that the combustion heat of a particulate is dissipated to a metal storage container, and can reduce the unburned residue of the collected particulate. Furthermore, the flow path sealed at both ends is directed from the outer peripheral wall of the honeycomb filter end face toward the center at a length (B55) of a maximum of 5 × (partition wall pitch), preferably a maximum of 3 × (partition wall pitch). By setting the length (B55), the ratio of cell walls having a filter function can be relatively increased, and the pressure loss of the honeycomb filter can be minimized.

Here, the method described in Patent Document 3 is used as the method of sealing both end portions 51d and 51e of the flow path 51c in the vicinity of the outer peripheral wall 51a of the honeycomb filter 50 shown in FIG. 5 with the sealing materials 55d and 55e, respectively. It can be done as follows. For example, a honeycomb structure 51 is made of a ceramic material forming cordierite, and a flow path end 51d of the honeycomb structure 51 is shown in a perspective view of the honeycomb structure 51 and the sealing film 30 shown in FIG. (51e) is covered with the sealing film 30 and adhered. Then, a plurality of through holes 30a and 30b are melted by heat such as a laser into a checkered pattern and a flow path in the vicinity of the outer peripheral wall 51a in the sealing film 30 and a flow path to be sealed at the flow path end 51d (51e). Form.
Next, although not shown, the flow path end 51d (51e) of the honeycomb structure 51 is immersed in the slurry contained in the sealing material, and the slurry is passed through the through holes 30a and 30b of the sealing film 30. It penetrates into the flow path 51c of the part 51d (51e). Then, the slurry is cured and the sealing film 30 is removed. Through the above steps, the honeycomb filter 50 can be obtained. At this time, as shown in FIG. 3, the sealing film 30 is larger than the outer peripheral dimension of the flow path end portion of the honeycomb structure 51. Moreover, as shown in FIG. 4, there is also a proposal to use a commercially available disposable adhesive sheet 40 having substantially the same shape as the flow path of the honeycomb structure 51 (see, for example, Patent Document 4 (Japanese Patent Application Laid-Open No. 2001-300922)). ). In FIG. 4, 51c denotes a flow path, 51d (51e) denotes a flow path end, and 30a and 30b denote through holes.

  Further, Patent Document 5 describes the following as a method of sealing the flow path 51c in the vicinity of the outer peripheral wall 51a of the ceramic honeycomb filter 50. A film end is attached to both end faces of the ceramic honeycomb filter 60 in which a predetermined opening of the flow path 61c of the ceramic honeycomb structure 61 is sealed, and the flow path end is not sealed at the flow path end near the outer peripheral wall 51a. A through hole is formed in the film portion corresponding to the portion, and then a filler is introduced from the through hole. Alternatively, the end face 61d (61e) except for the flow path 51c in the vicinity of the outer peripheral wall 51a is covered with an appropriate mask material, and a filler is pressed into the end of the flow path that is not sealed by the flow path 51c in the vicinity of the outer peripheral wall 51a. A honeycomb filter 50 in which both ends of the flow path 51c in the vicinity of the outer peripheral wall 51a are sealed can be obtained.

JP-A-5-118211 JP 2003-126629 A JP 2002-28915 A Japanese Patent Laid-Open No. 2001-300922 JP-B-1-47206

However, in the honeycomb filter, when it is attempted to form a heat retaining space 55 as shown in FIG. 5 that suppresses the combustion heat generated when the particulates are burned and regenerated to dissipate into the metal storage container, In Patent Documents 1 and 2, a specific method of sealing both ends of the same flow path in the vicinity of the outer peripheral wall of the honeycomb structure with a sealing material, particularly when the sealing part is formed, the sealing material enters the flow path. There was no description about the specific structure and forming method of the mask to be eliminated. Therefore, as a method of sealing both ends of the same flow path in the vicinity of the outer peripheral wall with a sealing material in order to form the heat retaining space 55, the sealing film 30 described in Patent Document 3 is used for the honeycomb structure. A method in which through holes are formed in a film positioned in a flow path to be sealed with a plugging material by heat from a laser beam and the like, and a plugging material slurry is infiltrated through the through holes. When a method of filling a plugging slurry from a hole made in the mask by making a hole at a position corresponding to a predetermined flow path of the pressure-sensitive adhesive sheet 40 described in No. 4 is as follows: Such a problem occurred. In these methods of Patent Documents 3 and 4, since it is necessary to make a through hole in a predetermined position of the sealing film 30 or the adhesive sheet 40 by a method such as a laser, a heat insulating space 55 is formed in the vicinity of the outer peripheral wall of the honeycomb structure. In order to seal both ends of the same flow path near the outer peripheral wall with a sealing material, all the positions corresponding to the sealing material film 30 and the flow path near the outer peripheral wall of the adhesive sheet 40 It is necessary to form a through hole with a laser or the like. Therefore, there has been a problem that the time for opening the through-hole becomes long. That is, in the flow path at the center of the honeycomb structure, through-holes are alternately formed in the checker film 30 and the pressure-sensitive adhesive sheet 40 so as to have a checkered pattern. This is because it is necessary to form through holes at positions corresponding to all the adjacent flow paths. More specifically, compared to the case where the through holes are alternately formed so as to form a checkered pattern, the number of flow paths in which the through holes are to be formed is doubled in the vicinity of the outer peripheral wall, and the area of the circle is 2 of the diameter. This is because the number of flow paths increases as the distance from the outer wall increases.
Moreover, as described in Patent Document 5, the end surface except for the vicinity of the outer peripheral wall is covered with an appropriate mask material, and the sealing material is press-fitted into the end of the flow path that is not sealed by the flow path near the outer peripheral wall. In such cases, the following problems occurred. If the mask material is not positioned correctly when the honeycomb filter end face is covered with a film or mask material, the number of channels to be sealed near the outer peripheral wall will be biased, and from the outermost peripheral portion near the outer peripheral wall. There is a problem in that the number of heat insulation spaces formed in the central portion is biased, and the heat of combustion during regeneration is dissipated from a portion having a small number of heat insulation spaces to a metal storage container. Furthermore, when the film or mask material is peeled off from the end of the flow path, the sealing material flows into the flow path that is not sealed, and the flow path is not alternately sealed, resulting in a flow path through which exhaust gas cannot pass, resulting in pressure loss. The problem that becomes larger.

  An object of the present invention is to form a heat insulation space capable of suppressing the heat of combustion at the time of filter regeneration from being dissipated into a metal storage container in a honeycomb filter that seals the flow path end of a honeycomb structure. Therefore, when sealing both ends of the flow path near the outer peripheral wall with a sealing material, a heat insulating space can be formed uniformly and the time required for forming a through hole at the sealing position can be shortened. It is to obtain a film for stopping and a method for producing a honeycomb filter using the same.

In order to solve the above problems, the present inventor has found the optimum shape and structure of the sealing film as a result of intensive studies.
Specifically, the sealing film of the present invention is a sealing film used for manufacturing a honeycomb filter for sealing a flow path end portion of a honeycomb structure, and the outer peripheral shape of the flow path end portion is at least A release paper in which the shape of a part of the peripheral portion is approximately matched, and an adhesive film having a shape smaller than the outer peripheral shape of the end portion of the honeycomb structure is attached to the release paper. And
By adopting the above configuration, the both ends of the flow path can be covered with a sealing film except in the range of sealing both ends of the flow path near the outer peripheral wall. There is no need to form through holes in the film to be sealed, and the time for forming the through holes in the film can be shortened. In addition, since at least a part of the periphery of the release paper can be accurately positioned with the outer periphery of the channel end of the honeycomb structure, variations in the range in which both ends of the same channel near the outer peripheral wall are sealed are eliminated. Thus, a honeycomb filter can be obtained in which the heat insulation space in the vicinity of the outer peripheral wall is uniformly formed and the combustion heat of the particulates can be prevented from being diffused into the metal storage container.
Here, the sticking film has a similar shape smaller than the outer periphery of the end portion of the honeycomb structure, and as shown in FIGS. 1A and 1C, the outer peripheral shape of the flow path end portions 51d and 51e of the honeycomb structure body. Is preferably attached to the release paper at a position having a predetermined interval from the peripheral portions 11a, 11b, and 11c of the release paper that substantially coincide with each other. Sticking the film, the outer peripheral shape of the flow path end portion, at least a portion of the periphery of the shape and the substantially aligned to have release paper peripheral portion 11a, 11b, from 11c, the release paper at a position having a predetermined distance By being stuck, when the sticking film is stuck on the flow path end, the center of the sticking film is stuck substantially concentrically with the center of the outer peripheral shape of the flow path end. Thereby, the dispersion | variation in the range which seals the both ends of the same flow path near an outer peripheral wall can be eliminated. At this time, the difference between the center of the adhesive film and the center of the outer peripheral shape of the end of the flow path is preferably not more than one time the cell pitch of the honeycomb structure, and thereby both ends of the same flow path near the outer peripheral wall. A honeycomb filter capable of eliminating the variation in the sealing range, forming a uniform heat-retaining space in the vicinity of the outer peripheral wall, and preventing the combustion heat of the particulate from being dissipated into the metal storage container is obtained. Can do it.
Note that the periphery of the release paper has the same shape as the outer shape of the flow path end of the honeycomb structure, for example, if the outer shape of the flow path end of the honeycomb structure is a circle or an ellipse, the release paper also has the same shape . If it is made into an ellipse, it can be adjusted in any direction with respect to the honeycomb structure, and production is also easy. On the other hand, as long as the peripheral portion of the release paper has a shape in which at least three locations are combined with the outer periphery of the flow path end of the honeycomb structure, it may be other than a circular shape, and may be a substantially polygonal shape such as a substantially triangular shape or a substantially rectangular shape. Also, you can save release paper.

  In the sealing film of the present invention, the release paper preferably has means for separating the release paper into a plurality of pieces. By having means for separating the release paper into a plurality of pieces, the film is correctly positioned when the adhesive film is attached from the release paper to the end of the flow path of the honeycomb structure. This means that one part of the release paper is separated by one of a plurality of separation means, and the part is peeled off from the adhesive film, and the part of the adhesive film is attached to the end of the channel of the honeycomb structure. This is because the sticking film is fixed to the end of the flow path, and then the release paper is separated by the remaining separating means, peeled off from the sticking film, and stuck to the sticking film. Moreover, peeling of the release paper from the sticking film becomes easy. As a means for separating the release paper into a plurality, perforations or cuts can be made in the release paper

  In the sealing film of the present invention, the adhesive film preferably has a thickness of 0.03 to 3.0 mm, and the material thereof is selected from polypropylene, polyethylene, acrylic, and olefin. If it is selected from polypropylene, polyethylene, acrylic, and olefin, and its thickness is 0.03 or more, the strength before and after sticking is secured, and if it is 3.0 mm or less, formation of a through hole is facilitated by a laser or the like.

In the sealing film of the present invention, the adhesive strength of the adhesive material of the adhesive film is preferably 2 N / 25 mm or more. When the adhesive strength of the adhesive film is less than 2 N / 25 mm, it is easy to peel off when it is attached to the end of the flow path of the honeycomb structure, or when the sealing material is infiltrated, it is not sealed. The sealing material flows into the path, and the flow path cannot be alternately sealed. Preferably it should just be 4N / 25mm or more.
And it is preferable that the adhesive material of the said adhesive film is 0.01-1.0 mm in thickness, and the material is a material based on rubbers, such as an acrylic rubber and a styrene butadiene rubber. When the sticking material of the sticking film has a thickness of 0.01 to 1.0 mm and the material is a material based on rubber, sticking to the end of the channel of the honeycomb structure is sticking The adhesive material for the film is flexibly deformed and adhered in accordance with the shape of the end portion of the honeycomb structure, so that the adhesive film can be more closely attached to the end portion of the honeycomb structure. For this reason, the sticking film is difficult to peel off, so that it does not shift. Further, when the sealing material is infiltrated, the sealing material flows into the unsealed flow path, and the flow paths cannot be alternately sealed. It becomes difficult.

Next, the present invention relates to a method for manufacturing a honeycomb filter in which a honeycomb structure having a plurality of flow paths inside an outer peripheral wall and the outer peripheral wall is manufactured, and then a flow path end of the honeycomb structure is sealed. ,
And the outer peripheral shape of the flow path ends, stuck films and release paper is matched with the shape of at least part of the peripheral portion, a shape smaller than the outer peripheral shape of the end portion of the honeycomb structure to the release paper Covering the flow path end of the honeycomb structure with the release paper of the sealing film that is adhered;
Separating the release paper from the sticking film, and sticking the sticking film to the flow path end of the honeycomb structure;
Forming a through hole at a position where the flow path ends of the honeycomb structure of the adhesive film are alternately sealed;
It is characterized by including. By including these steps, the both ends of the flow path are covered with a sealing film except in the vicinity of the outer peripheral wall, so that both ends of the flow path are sealed near the outer peripheral wall as in the prior art. This eliminates the need to form through-holes in the film in the range, thereby reducing the time for forming the through-holes in the film. Furthermore, since at least a part of the periphery of the release paper can be accurately positioned with the outer periphery of the end of the flow path of the honeycomb structure, it is possible to eliminate variations in the range in which both ends near the outer peripheral wall are sealed, The heat insulation space in the vicinity of the outer peripheral wall is formed uniformly, and the heat of combustion of the particulates can be prevented from being dissipated to the metal storage container.

  According to the sealing film of the present invention, except for the range of sealing both ends of the flow path in the vicinity of the outer peripheral wall, covered with the sealing film, sealing both ends of the flow path in the vicinity of the outer peripheral wall, Since it is possible to eliminate variations in the range of sealing both ends of the same flow path in the vicinity of the outer peripheral wall, a heat insulation space that suppresses the diffusion of particulate combustion heat to the metal storage container is uniformly formed, Moreover, the time for forming the through hole to the sealing position in the vicinity of the outer peripheral wall can be shortened.

(Embodiment 1)
1A and 1B are schematic views of a sealing film 10 according to Embodiment 1, wherein FIG. 1A is a front view, FIG. 1B is a side view, and FIG. 1C is a front view of a modification. 1 (a) and 1 (b) is a sealing film 10 used for manufacturing a honeycomb filter (50) for sealing the flow path end portion 51d (51e) of a honeycomb structure 51 as shown in FIG. A release paper 11 having an outer diameter D11 in which the outer peripheral shape of the flow path end portion 51d (51e) of the honeycomb structure 51 is matched with the shapes of the peripheral portions 11a to 11c, and the release paper 11 by sticking with stuck material 13, the adhered film 12 that the outer diameter D12 of the smaller shape than the outer peripheral shape of the flow passage end portion 51d of the honeycomb structure 51 (51e), the circumferential portion of the release paper 11a~ From 11c, it sticks concentrically at a position having a fixed interval. The release paper 11 has a cut 14 that separates the release paper 11 into two. As the adhesive film 12, 0.05 mm thick polypropylene is selected.

  According to the sealing film 10 of FIG. 1, the outer diameter D11 of the release paper 11 is accurately positioned with respect to the outer periphery of the flow path end portion 51d (51e) of the honeycomb structure 51. The flow path end portion 51d (51e) can be covered without variation except in the vicinity of the outer peripheral wall 51a except for the range where both ends of the flow channel are sealed. Further, the release paper 11 can be easily peeled off from the adhesive film 12 by the cut 14 which is a separating means.

  The peripheral portions 11a to 11b of the release paper 11 may have a shape other than the circular shape as long as at least three locations are combined with the outer periphery 51f (51g) of the flow path end portion 51d (51e) of the honeycomb structure 51, as shown in FIG. As shown in (c), it is possible to save the release paper as a polygonal shape such as a substantially triangular shape or a substantially rectangular shape.

(Embodiment 2)
Fig.2 (a)-(f) is a schematic diagram which shows the manufacturing process of a honey-comb filter, The left side in (b)-(d) is a side view in each process, The right side is a top view in each process, (E) is a side view of this process, and (f) is a plan view of this process. This will be described in the order of the manufacturing process.

First, raw materials are blended to form a clay, which is extruded with a die having a honeycomb structure, dried, further fired at a temperature of 1400 ° C., made of cordierite, and shown in FIG. The flow path end 51d (51e) has an outer shape D51 of 250 mm, a length (L51) of 200 mm, a cell wall thickness of 0.3 mm, a cell wall pitch of 1.5 mm (44 cells / cm ² ), and an inner side of the outer peripheral wall 51a. A honeycomb structure 51 having a plurality of flow paths 51c formed by cell walls 51b orthogonal to each other was produced.

(A) Preparation of sealing film The sealing film 10 shown in FIGS. 1A and 1B was prepared. 1 is the same as the outer diameter D51 of the flow path end 51d (51e) of the honeycomb structure 51, and the release paper 11 has an outer diameter D11 of 250 mm. The adhesive film 12 having an outer diameter D12 of 242 mm excluding the second flow path from the outer peripheral wall 51a of 51 was attached concentrically with the adhesive material 13, and the release paper 11 was provided with cuts 14. As the adhesive film 12, 0.05 mm thick polypropylene was selected. This adhesive film had an adhesive force of 7.3 N / 25 mm and a holding force of 0.5 mm / 30 minutes.

(B) Covering the end of the flow path with release paper Next, the outer diameter D11 of the release paper 11 of the sealing film 10 is matched with the outer shape D51 of the honeycomb structure 51 to cover the flow path end 51d (51e). . At this time, the release paper 11 can accurately position the channel end 51d (51e) of the honeycomb structure 51, and the adhesive film 12 covers the honeycomb structure 51 except for the sealing range in the vicinity of the outer peripheral wall 51a, It can be attached to the channel end 51d (51e).

(C) Separate the release paper from the adhesive film and leave it in the honeycomb structure. Next, the release paper 11-1 is separated from the adhesive film 12 using the cut line 14, and is attached to the release paper 11-1. The pasted adhesive film 12 was adhered to the channel end 51d (51e) of the honeycomb structure 31, and then the remaining release paper 11-2 was separated from the adhesive film 12 through the cut line 14 to release the release paper. The part of the adhesive film 12 that had been attached to 11-2 was attached to the channel end 51d (51e) of the honeycomb structure 31 and was left behind. At this time, the deviation between the center of the adhesive film 12 and the center of the outer peripheral shape of the flow path end 51d (51e) was 0.8 mm.

(D) Forming a through-hole in the adhesive film Next, the adhesive film 12 at the position where the flow path end portions 51d (51e) of the honeycomb structure 51 are alternately sealed is irradiated with a laser so that the adhesive film 12 is sealed. The through-hole 12a was formed in. At this time, all the flow paths in which the adhesive film 12 does not completely cover the flow path of the honeycomb structure in the outer peripheral end surface portion of the adhesive film 12 are formed as the through holes 12b. As a result, since the through holes 12a were not formed at the sealing position near the outer peripheral wall, the number of through holes to be formed was reduced by about 7%, and the time for forming the through holes could be shortened.

(E) Filling the through hole with the sealing material Next, the flow path end 51d (51e) of the honeycomb structure 51 is immersed in the slurry 25 contained in the sealing material, and the slurry 25 penetrates the adhesive film 12. The channel end 51d (51e) was filled through the hole 12a. Further, the honeycomb structure 51 was heated to cure the slurry that entered the flow path end 51d (51f), and the adhesive film 12 was removed by burning.

(F) Honeycomb filter Through the above steps, the second length (D55) from the outer peripheral wall 51a of the flow path end 51d (51e) of the honeycomb structure 51 is sealed with the sealing material 55d (55e). The honeycomb filter 50 was sealed inside with a sealing material 52d (52e) in a checkered pattern. In such a honeycomb filter 50, the heat insulating space 55 formed from the outermost peripheral portion in the vicinity of the outer peripheral wall to the central portion is uniformly formed, so that the combustion heat of the particulate is dissipated in the metal storage container. Can be suppressed.

(Embodiment 3)
A honeycomb structure 51 shown in FIG. 5 was produced in the same manner as in the second embodiment.
Next, the sealing film 10 shown in FIGS. 1A and 1B was prepared as in the second embodiment. However, the adhesive material 13 was applied with an adhesive material based on acrylic rubber with a thickness of 0.5 mm.
Next, in the steps of FIGS. 2B to 2E as in the second embodiment, the slurry 25 is passed through the through holes 12a of the sticking film 12 to the flow path end portion 51d (51e) of the honeycomb structure 51. The flow path end 51d (51e) was filled. At this time, since the sealing film adhesive 13 was an adhesive having a thickness of 0.5 mm and a styrene butadiene rubber as a base, the sealing film was the end of the flow path of the honeycomb structure 51. Since the sealing film adheres to the end of the honeycomb structure, the sealing material does not flow into the non-sealed flow path, and the flow paths are sealed alternately. I couldn't stop it.
Then, through the above steps, the second length (D55) from the outer peripheral wall 51a of the flow path end 51d (51e) of the honeycomb structure 51 is sealed with the sealing material 55d (55e), and further inside thereof A honeycomb filter 50 sealed in a checkered pattern with a sealing material 52d (52e) was obtained.
In this honeycomb filter 50, the heat insulation space 55 formed from the outermost peripheral part in the vicinity of the outer peripheral wall to the central part is uniformly formed, so that the combustion heat of the particulates is prevented from being diffused into the metal storage container. be able to.

It is a schematic diagram of the film 10 for sealing of Embodiment 1, (a) is a front view, (b) is a side view, (c) shows the front view of a modification. (A)-(f) is a schematic diagram which shows the manufacturing process of a honey-comb filter, The left side in (b)-(d) is a side view in each process, The right side is a top view in each process, (e ) Is a side view of this process, and (f) is a plan view of this process. FIG. 3 is a perspective view of a conventional honeycomb structure 51 and a sealing film 30. It is a perspective view using the conventional commercially available disposable adhesive sheet 40 of the substantially same shape as the external shape of the flow-path edge part 51d (51e) of the honeycomb structure 51. FIG. The same flow path 51c in the vicinity of the outer peripheral wall 51a is sealed with sealing materials 55d and 55e, and the sealed flow path 51c is used as a heat retaining space 55. (a) is a front view and (b) is a front view. A cross-sectional view is shown. The schematic diagram of an example of the conventional honey-comb filter is shown, (a) is a front view, (b) is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 30: Film for sealing 11: Release paper 11a-11c: Peripheral part 12: Adhesive film 13: Adhesive material 14: Cut 12a, 12b, 30a, 30b: Through-hole 40: Adhesive sheet 50, 60: Honeycomb Filters 51, 61: Honeycomb structures 51a, 61a: Outer peripheral walls 51b, 61b: Cell walls 51c, 61c: Channels 51d, 51e, 61d, 61e: Channel ends 51f, 51g: (Channel ends) outer periphery 52d , 52e, 55d, 55e, 62d, 62e: Sealing material 55: Thermal insulation space 64: Storage container 63a to 63c: Gripping members 65a, 65b, 65c: Exhaust gas B55: Length from honeycomb filter end face D11, D12: Outside Diameter D51: Outline L51: Full length L52: Length

Claims (6)

The flow passage end portion of the honeycomb structure to a sealing film for use in manufacturing the honeycomb filter for sealing an outer peripheral shape of the flow path ends, were substantially aligned with the shape of at least part of the peripheral portion A sealing film, wherein a release paper and an adhesive film having a shape smaller than an outer peripheral shape of an end portion of the honeycomb structure are attached to the release paper with an adhesive material. The sticking film has a similar shape smaller than the outer periphery of the end portion of the honeycomb structure, and is stuck to the release paper at a certain interval from the periphery of the release paper. 2. The sealing film according to 1. The sealing film according to claim 1, wherein the release paper includes means for separating the release paper into a plurality of pieces. The said sticking film is 0.03-3.0 mm in thickness, The material is selected from a polypropylene, polyethylene, an acryl, and an olefin, The Claim 1 thru | or 3 characterized by the above-mentioned. Sealing film. The sealing film according to claim 4, wherein the adhesive material has a thickness of 0.01 to 1.0 mm, and the material thereof is a material based on rubber. In a method for manufacturing a honeycomb filter in which a honeycomb structure having a plurality of flow paths inside an outer peripheral wall and the outer peripheral wall is manufactured, and then a flow path end of the honeycomb structure is sealed.
And the outer peripheral shape of the flow path ends, stuck films and release paper is matched with the shape of at least part of the peripheral portion, a shape smaller than the outer peripheral shape of the end portion of the honeycomb structure to the release paper Covering the end of the flow path of the honeycomb structure with the release paper of the sealing film to which is attached;
Separating the release paper from the sticking film, and sticking the sticking film to the flow path end of the honeycomb structure;
Forming a through hole at a position where the flow path ends of the honeycomb structure of the adhesive film are alternately sealed;
The manufacturing method of the honey-comb filter characterized by including.

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