Honeycomb structure

Abstract

We provide a large honeycomb structure using a material with low heat capacity. [Solution] The honeycomb combination body 104 is formed by combining multiple honeycomb polygonal prisms 102, which are created by cutting the side portions of honeycomb cylindrical bodies 101, which are formed by winding a material in which a corrugated metal foil material is layered on a flat metal foil material, into a polygonal prism shape.

Description

Technical Field

[0001] The present invention relates to a honeycomb structure suitable for a rotary concentrator that removes harmful components from air containing harmful components such as carbon dioxide and organic solvent components.

Background Art

[0002] A rotary concentrator that removes harmful components from air containing harmful components such as carbon dioxide and organic solvent components is disclosed in Patent Document 1. In a rotary concentrator, a honeycomb structure called a large rotor with a diameter exceeding 1 meter is rotationally driven. The honeycomb structure carries an adsorbent that adsorbs harmful components at room temperature and releases the adsorbed harmful components at high temperature, and a catalyst that purifies harmful components.

[0003] A zone partitioning member is fixedly provided in front of the honeycomb structure. The honeycomb structure is partitioned into an adsorption zone, a regeneration zone, and a cooling zone by this zone partitioning member. As the honeycomb structure rotates, a certain part moves as adsorption zone → regeneration zone → cooling zone → adsorption zone → ···.

[0004] In the adsorption zone of the honeycomb structure, the adsorbent adsorbs harmful components in the air. Then, in the regeneration zone, by being heated, the adsorbent releases the adsorbed harmful components. And in the cooling zone, by being cooled, the adsorbent can adsorb harmful components again.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Traditionally, honeycomb structures have been made from nonwoven fabrics based on inorganic fibers or ceramics. The adsorbent material supported on the honeycomb structure adsorbs harmful components at room temperature and releases the adsorbed harmful components at high temperatures. Therefore, it is preferable to construct the honeycomb structure using a material with low heat capacity, as this allows the temperature of the honeycomb structure to be raised with less energy and reduces the amount of energy wasted. However, materials with low heat capacity are weak, making it difficult to manufacture large items from them.

[0007] This invention was made in view of these conventional problems. The object of this invention is to provide a large honeycomb structure that uses a material with low heat capacity. [Means for solving the problem]

[0008] The present invention solves the above-mentioned problems by the following means. For ease of understanding, reference numerals corresponding to embodiments of the present invention are enclosed in parentheses, but the invention is not limited thereto. Furthermore, the configurations described with reference numerals may be replaced or improved as appropriate.

[0009] The first aspect is, The honeycomb structure (10) has a honeycomb combination (104) which is formed by combining multiple honeycomb polygonal prisms (102) which are created by cutting the sides of honeycomb cylindrical bodies (101) formed by winding a material in which corrugated metal foil material is layered on top of flat metal foil material.

[0010] The second aspect is the honeycomb structure (10) of the first aspect, The aforementioned honeycomb polygonal prism (102) is in the shape of a regular hexagonal prism, The honeycomb structure (10) has a plurality of honeycomb shaped bodies (103) arranged around the honeycomb combination (104) so ​​that it forms a polygonal prism shape. This is a honeycomb structure (10).

[0011] The third aspect is the honeycomb structure (10) of the second aspect, The honeycomb shaped body (103) is hexagonal or heptagonal, and is arranged around the honeycomb combination body (104) such that the honeycomb structure (10) is a regular 24-sided prism. This is a honeycomb structure (10).

[0012] The fourth aspect is the honeycomb structure (10) of the first aspect, The aforementioned honeycomb polygonal prism (102) is in the shape of a regular hexagonal prism, The honeycomb structure (10) has a plurality of honeycomb shaped bodies (103) arranged around the honeycomb combination (104) so ​​that the honeycomb structure (10) becomes cylindrical. This is a honeycomb structure (10).

[0013] The fifth aspect is a honeycomb structure (10) of any of the first to fourth aspects, The present invention has a plurality of the aforementioned honeycomb combinations (104), and the plurality of honeycomb combinations (104) are arranged in the axial direction. This is a honeycomb structure (10).

[0014] The sixth aspect is a honeycomb structure (10) of any of the first to fourth aspects, The aforementioned honeycomb polygonal prism (102) is provided with a metal foil material around it. This is a honeycomb structure (10).

[0015] The seventh aspect is a honeycomb structure (10) of any of the first to fourth aspects, The aforementioned honeycomb structure (10) is provided with a metal foil material around it. This is a honeycomb structure (10).

[0016] The eighth aspect is a honeycomb structure (10) of any of the first to fourth aspects, The honeycomb prism (102) and the honeycomb shaping body (103) that constitute the honeycomb structure (10) are bonded to each other with an adhesive or a filler. It is a honeycomb structure (10).

[0017] A ninth aspect is the honeycomb structure (10) according to any one of the first to fourth aspects, A catalyst or a gas adsorbent is supported on the honeycomb prism (102) and the honeycomb shaping body (103) that constitute the honeycomb structure (10). It is a honeycomb structure (10).

Advantages of the Invention

[0018] According to this aspect, it is possible to provide a large honeycomb structure using a material having a smaller heat capacity than those generally used in the past.

Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a model diagram of a rotary concentrator. [Figure 2] FIG. 2 is a diagram showing the honeycomb cylinder forming step #101. [Figure 3] FIG. 3 is a plan view of the honeycomb cylinder formed in the honeycomb cylinder forming step #101. [Figure 4] FIG. 4 is a plan view of the honeycomb prism formed in the honeycomb prism forming step #102. [Figure 5] FIG. 5 is a perspective view of the honeycomb prism. [Figure 6] FIG. 6 is a plan view of the first honeycomb shaping body formed in the honeycomb shaping body forming step #103. [[ID=4|1]] [Figure 7] FIG. 7 is a plan view of the second honeycomb shaping body formed in the honeycomb shaping body forming step #103. [Figure 8] FIG. 8 is a plan view of the honeycomb combination body formed in the honeycomb prism combination step #104. [Figure 9] It should be noted that in the provided text, there seems to be a formatting issue with the "!14" tag which might be a misprint. I've left it as is in the translation according to the instructions. If this is an error in the original text, it should be corrected for a more accurate translation.Figure 9 is a plan view of the honeycomb assembly formed in honeycomb polygonal prism assembly process #104, combined with the first honeycomb molded body. [Figure 10] Figure 10 is a plan view of a structure in which a second honeycomb structure is added to a honeycomb assembly that has been combined with a first honeycomb structure. [Modes for carrying out the invention]

[0020] Embodiments of the present invention will be described below with reference to the attached drawings.

[0021] Figure 1 is a model diagram of a rotary concentration apparatus. First, to facilitate understanding of the invention, a rotary concentration apparatus using a honeycomb structure will be described with reference to Figure 1.

[0022] The rotary concentration device 1 includes a honeycomb structure 10, a zone partitioning member 20, a main flow path 31, an air flow path 32, a first fan 41, a second fan 42, and a heater 50.

[0023] The honeycomb structure 10 is a rotor that is driven to rotate and has countless micropores. The honeycomb structure 10 has a diameter of, for example, more than 1 meter. The honeycomb structure 10 is supported with an adsorbent that adsorbs harmful components at room temperature and releases the adsorbed harmful components at high temperatures, for example, around 200°C, as well as a catalyst that purifies the harmful components. Examples of such adsorbents include amine-based absorbents and hydrophobic zeolites.

[0024] The zone partitioning member 20 is provided on the front portion of the honeycomb structure 10. The zone partitioning member 20 has a shape such as two V-shapes placed side by side, and divides the honeycomb structure 10 into three zones.

[0025] The first zone partitioned by the zone partitioning member 20 is the adsorption zone 201. In this adsorption zone 201, the adsorbent supported on the honeycomb structure adsorbs harmful components from the air.

[0026] The second zone is the regeneration zone 202. In this regeneration zone 202, the honeycomb structure is heated, causing the adsorbent to release the harmful components it adsorbed in the adsorption zone 201. This regenerates the adsorption performance of the adsorbent.

[0027] The third zone is the cooling zone 203. In this cooling zone 203, the honeycomb structure is cooled, allowing the adsorbent to adsorb harmful components again.

[0028] The main flow path 31 is a conduit through which air flows and includes a main upper flow path 311 on the front side of the honeycomb structure 10 and a main lower flow path 312 on the back side of the honeycomb structure 10. The tip of the main upper flow path 311 opens toward the adsorption zone 201 of the honeycomb structure 10. The base end of the main lower flow path 312 also opens toward the adsorption zone 201 of the honeycomb structure 10.

[0029] The air passage 32 is a conduit through which air flows and includes an upper air passage 321 on the front side of the honeycomb structure 10, a middle air passage 322 on the back side of the honeycomb structure 10, and a lower air passage 323 on the front side of the honeycomb structure 10. The base end of the upper air passage 321 is open and takes in air. The tip of the upper air passage 321 opens toward the cooling zone 203 of the honeycomb structure 10. The base end of the middle air passage 322 also opens toward the cooling zone 203 of the honeycomb structure 10. The tip of the middle air passage 322 opens toward the regeneration zone 202 of the honeycomb structure 10. The base end of the lower air passage 323 also opens toward the regeneration zone 202 of the honeycomb structure 10.

[0030] The first fan 41 is positioned in the main lower passage 312, and is configured to allow air to flow through the main passage 31 (main upper passage 311 and main lower passage 312).

[0031] The second fan 42 is positioned in the lower air passage 323, and is configured to allow air to flow through the air passage 32 (upper air passage 321, middle air passage 322, and lower air passage 323).

[0032] The heater 50 is positioned in the air passage 322 and heats the air flowing through the air passage 322.

[0033] With the structure described above, when the first fan 41, the second fan 42, and the heater 50 are activated, the air drawn in from the main upper flow path 311 passes through the adsorption zone 201 of the honeycomb structure 10. At this time, harmful components contained in the air are adsorbed by the adsorbent material of the honeycomb structure. Then, the air from which the harmful components have been removed flows through the main lower flow path 312 and is discharged.

[0034] Furthermore, the air flowing through the upper air channel 321 passes through the cooling zone 203 of the honeycomb structure 10. At this time, the air cools the honeycomb structure 10, that is, it exchanges heat with the honeycomb structure 10. The air, heated by the heat exchange, flows through the air channel 322, is further heated by the heater 50 to a high temperature, and passes through the regeneration zone 202 of the honeycomb structure 10, where the high-temperature air heats the honeycomb structure 10 (the adsorbent material of the honeycomb structure). The adsorbent material of the honeycomb structure has the characteristic of releasing the harmful components it has adsorbed at high temperatures. Therefore, air containing harmful components is released from the adsorbent material of the honeycomb structure. This released air flows through the lower air channel 323 and is discharged.

[0035] The honeycomb structure 10 is driven to rotate, so a certain part moves from the adsorption zone → regeneration zone → cooling zone → adsorption zone → ... In the adsorption zone 201, the adsorbent material adsorbs harmful components from the air. In the subsequent regeneration zone 202, heating causes the adsorbent material to release the harmful components adsorbed in the adsorption zone 201. Next, in the cooling zone 203, cooling restores the harmful component adsorption performance of the adsorbent material.

[0036] As described above, the rotary concentration device 1 operates. The adsorbent supported on the honeycomb structure 10 has the characteristic of adsorbing harmful components at room temperature and releasing the adsorbed harmful components at high temperatures, so it is preferable that the temperature rises and falls rapidly. Conventionally, nonwoven fabrics based on inorganic fibers or ceramics have been used as honeycomb structures.

[0037] In response to this, the inventors conceived of using a metal foil material with a thickness of about 30 microns. This is because such materials have a small heat capacity, allowing their temperature to rise and fall more quickly than conventional products. For example, automotive exhaust gas purification catalysts are manufactured by winding a material in which a corrugated metal foil material is layered on top of a flat metal foil material. However, it was difficult to manufacture large cylindrical honeycomb structures using this manufacturing method. Because the material in which a corrugated metal foil material is layered on top of a flat metal foil material is soft, as the radius increases when the material is wound, the force acting in the tangential direction (tangential force) increases, causing it to tighten as the radius increases. As a result, the corrugated metal foil material becomes easily crushed.

[0038] Therefore, through diligent research, the inventors conceived of forming a honeycomb composite by combining multiple polygonal prism-shaped honeycomb polygonal prisms, and then arranging multiple honeycomb-shaped bodies around it to construct a roughly cylindrical or cylindrical honeycomb structure.

[0039] Specifically, it will be manufactured as follows:

[0040] (Honeycomb cylindrical structure formation process #101) Figure 2 shows the honeycomb cylinder formation process #101. Figure 3 is a plan view of the honeycomb cylinder formed in the honeycomb cylinder formation process #101. First, a honeycomb cylindrical structure is formed by winding a material consisting of a flat metal foil layered with a corrugated metal foil onto a core material. Figure 2 shows an example where the core material rotates counterclockwise, as indicated by the arrow. Alternatively, the flat metal foil and the corrugated metal foil can be brazed together by placing multiple rows of linear nickel solder, for example, about 1 millimeter wide, at predetermined intervals between them.

[0041] As the honeycomb cylindrical structure becomes larger, the tangential force F increases, causing it to tighten and making the corrugated metal foil material more susceptible to crushing. Therefore, the diameter is preferably no more than about 400 millimeters. The thickness (axial length) is preferably about 60 to 120 millimeters. While a thicker structure is desirable for the adsorption performance of the honeycomb structure, if it is too thick, it becomes difficult to cut the surrounding portion in the process described later.

[0042] After the honeycomb cylindrical body formation process #101 described above, a honeycomb cylindrical body 101 as shown in Figure 3 is formed.

[0043] (Honeycomb polygonal column formation process #102) Figure 4 is a plan view of the honeycomb polygonal prism formed in honeycomb polygonal prism formation process #102. Figure 5 is a perspective view of the honeycomb polygonal prism. Next, the honeycomb cylindrical body 101 formed in step #101 is cut using, for example, a cutting wheel, to form a honeycomb polygonal prism 102. In this case, a regular hexagonal prism-shaped honeycomb polygonal prism 102 is formed.

[0044] After the honeycomb polygonal prism formation process #102 described above, a honeycomb polygonal prism 102 as shown in Figure 4 is formed. Figure 5 shows a perspective view of the honeycomb polygonal prism 102.

[0045] (Honeycomb structure formation process #103) Figure 6 is a plan view of the first honeycomb molded body formed in honeycomb molded body formation process #103. Figure 7 is a plan view of the second honeycomb molded body formed in honeycomb molded body formation process #103. In the following drawings, the honeycomb holes will be omitted to avoid complexity.

[0046] Next, the honeycomb cylindrical body 101 formed in honeycomb cylindrical body formation step #101 is cut using, for example, a cutting wheel to form a honeycomb shaped body. The shape of the honeycomb shaped body is such that, when placed around the honeycomb combination body in the honeycomb structure formation step #104 described later, the honeycomb structure will be approximately cylindrical or cylindrical.

[0047] In this embodiment, a honeycomb structure with a regular 24-sided prism shape is manufactured as a substantially cylindrical honeycomb structure. Therefore, the honeycomb molded body has a shape such that when placed around the honeycomb assembly, the honeycomb structure becomes a regular 24-sided prism.

[0048] Specifically, the shape of the first honeycomb structure 103-1 is shown in Figure 6. Figure 6 also shows six of the first honeycomb structures 103-1. In particular, the explanation will refer to the first honeycomb structure 103-1 shown at the bottom. The first honeycomb structure 103-1 is bilaterally symmetrical, with the left side b1 and the right side b2 extending from vertex a. The angle between the left side b1 and the right side b2 is 120 degrees. The lengths of the left side b1 and the right side b2 are the same as the side lengths of the regular hexagonal prism honeycomb polygonal prism 102. Vertex a lies on the perpendicular bisector of the base c. The left side d1, which is continuous with the base c, has an angle of 165 degrees with the base c. Similarly, the right side d2, which is continuous with the base c, also has an angle of 165 degrees with the base c. The side e1, which is continuous with side d1, is parallel to the perpendicular bisector of the base c. The angle between side e1 and side d1 is 105 degrees. Side e1 is continuous with side b1, and the angle between them is 120 degrees. Side e2, which is continuous with side d2, is also parallel to the perpendicular bisector of base c. Side e2 has an angle of 105 degrees with side d2. Side e2 is continuous with side b2, and the angle between them is 120 degrees. The shape of the first honeycomb structure 103-1 is as described above.

[0049] The shape of the second honeycomb structure 103-2 is shown in Figure 7. Figure 7 shows six of the second honeycomb structures 103-2. In particular, the explanation will refer to the second honeycomb structure 103-2 shown on the far left. The second honeycomb structure 103-2 is vertically symmetrical. However, if considered rotated 90 degrees, it is horizontally symmetrical. The length of the left side a is the same as the length of the side of the regular hexagonal prism honeycomb polygonal prism 102. The upper side b1, which is continuous with side a, has an angle of 120 degrees with side a. Similarly, the lower side b2, which is continuous with side a, also has an angle of 120 degrees with side a. Side c is parallel to side a. The upper side d1, which is continuous with side c, has an angle of 165 degrees with side c. Side d1 is continuous with side b1 and has an angle of 75 degrees. Similarly, the lower side d2, which is continuous with side c, also has an angle of 165 degrees with side c. Side d2 is continuous with side b2 and has an angle of 75 degrees. The shape of the second honeycomb-shaped body 103-2 is as described above.

[0050] (Honeycomb polygonal prism assembly process #104) Figure 8 is a plan view of the honeycomb assembly formed in honeycomb polygonal prism assembly process #104. The honeycomb polygonal prisms 102 formed in honeycomb polygonal prism formation step #102 are combined to form a honeycomb combination 104. Specifically, six hexagonal prism-shaped honeycomb polygonal prisms 102 are arranged so as to touch each side of the central hexagonal prism-shaped honeycomb polygonal prism 102. At this time, it is preferable to bond the honeycomb polygonal prisms together with adhesive. In this way, the honeycomb combination 104 shown in Figure 8 is formed.

[0051] (First honeycomb molded assembly process #105) Figure 9 is a plan view of the honeycomb assembly formed in honeycomb polygonal prism assembly process #104, combined with the first honeycomb molded body. Next, the first honeycomb molded body 103-1 is assembled so as to be in contact with both adjacent honeycomb polygonal prisms 102 included in the honeycomb assembly 104. At this time, it is preferable to bond the honeycomb polygonal prisms 102 and the first honeycomb molded body 103-1 with adhesive. This state is shown in Figure 9.

[0052] (Second honeycomb molded assembly process #106) Figure 10 is a plan view of a structure in which a second honeycomb structure is added to a honeycomb assembly that has been combined with a first honeycomb structure. Next, the second honeycomb structure 103-2 is combined between the adjacent first honeycomb structures 103-1 so as to be in contact with the honeycomb polygonal prism 102 and the first honeycomb structure 103-1. At this time, it is advisable to bond the honeycomb polygonal prism 102, the first honeycomb structure 103-1 and the second honeycomb structure 103-2 with adhesive. This state is shown in Figure 10. This is a regular 24-sided prism (approximately cylindrical) honeycomb structure 10.

[0053] To manufacture a long honeycomb structure, the honeycomb structures 10 manufactured as described above can be arranged and connected in the axial direction.

[0054] Furthermore, although the sides of the aforementioned honeycomb polygonal prism 102 are left as they are after being cut with a cutting wheel and have sharp edges, the perimeter may be wrapped with metal foil. This would increase safety when transporting the honeycomb polygonal prism 102.

[0055] Furthermore, although the honeycomb structure 10 described above has sharp edges due to being cut with a cutting wheel, the surrounding surface may also be wrapped with metal foil. This would increase safety when transporting the honeycomb structure 10.

[0056] Furthermore, although the honeycomb structure 10 described above was a regular 24-sided prism, it may also be cylindrical. In this case, the outer surfaces of the first honeycomb structure 103-1 and the second honeycomb structure 103-2 should be made into arc shapes.

[0057] Furthermore, the honeycomb structure 10 may be in the shape of a regular dodecagonal prism or a regular 36-sided prism. In this case, the outer surfaces of the first honeycomb molded body 103-1 and the second honeycomb molded body 103-2 should be shaped to suit the configuration.

[0058] According to this embodiment, since a honeycomb structure is constructed using metal foil material, when used in a rotary concentrator, the temperature can be raised and lowered rapidly, and energy efficiency is improved, such as by reducing the heater output compared to conventional methods.

[0059] Furthermore, by combining multiple polygonal prism-shaped honeycomb polygonal prisms to form a honeycomb combination and arranging multiple honeycomb-shaped bodies around it, a roughly cylindrical or cylindrical honeycomb structure is constructed, making it possible to manufacture large honeycomb structures even when using soft materials.

[0060] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0061] For example, the honeycomb combination was constructed by arranging six hexagonal prism-shaped honeycomb polygonal prisms 102 so as to be touching each side of a central hexagonal prism-shaped honeycomb polygonal prism 102, but it is not limited to this. The honeycomb combination may also be constructed by arranging more hexagonal prism-shaped honeycomb polygonal prisms 102 around the six hexagonal prism-shaped honeycomb polygonal prisms 102.

[0062] Furthermore, honeycomb polygonal prisms are not limited to regular hexagonal prisms. They may also be regular triangular prisms or regular square prisms.

[0063] Furthermore, in the above embodiment, the honeycomb structure 10 was constructed in the following order: first, honeycomb polygonal prisms 102 were combined to form a honeycomb combination 104; then, the first honeycomb molded body 103-1 was combined; and subsequently, the second honeycomb molded body 103-2 was combined. However, this order is merely one example. The first honeycomb molded body 103-1 and the second honeycomb molded body 103-2 may be assembled alternately, or several honeycomb polygonal prisms 102 may be combined before assembling the first honeycomb molded body 103-1 and the second honeycomb molded body 103-2.

[0064] Furthermore, the first honeycomb molded body 103-1 and the second honeycomb molded body 103-2 do not necessarily need to be formed by cutting the main honeycomb cylindrical body 101; they may be formed into a desired shape using, for example, resin.

[0065] Furthermore, although the above embodiment described an example in which each honeycomb polygonal prism and each honeycomb molded body are bonded together with an adhesive, this is merely one example. For example, gaps may be prevented by bonding them together with a filler such as putty. As for the putty, a heat-resistant material is preferable, and for example, a silicone-based putty may be used. [Explanation of Symbols]

[0066] 1. Rotary Concentrator 10 Honeycomb structure 101 Honeycomb cylinder 102 Honeycomb Polygonal Prism 103 Honeycomb Plastic Body 104 Honeycomb Combination

Claims

1. A honeycomb structure having a honeycomb combination body formed by combining multiple honeycomb polygonal prisms, which are created by wrapping a material consisting of a flat metal foil with a corrugated metal foil around it, and then cutting the sides of these honeycomb cylindrical structures to form polygonal prisms.

2. In the honeycomb structure described in claim 1, The aforementioned honeycomb polygonal prism is in the shape of a regular hexagonal prism, The honeycomb structure has a plurality of honeycomb-shaped bodies arranged around the honeycomb combination so that the honeycomb structure is polygonal prism-shaped. Honeycomb structure.

3. In the honeycomb structure described in claim 2, The honeycomb structure is hexagonal or heptagonal, and is arranged around the honeycomb assembly such that the honeycomb structure forms a regular 24-sided prism. Honeycomb structure.

4. In the honeycomb structure described in claim 1, The aforementioned honeycomb polygonal prism is in the shape of a regular hexagonal prism, The honeycomb structure has a plurality of honeycomb-shaped bodies arranged around the honeycomb combination so that the honeycomb structure is cylindrical. Honeycomb structure.

5. In the honeycomb structure according to any one of claims 1 to 4, The present invention has multiple honeycomb combinations, and these multiple honeycomb combinations are arranged in the axial direction. Honeycomb structure.

6. In the honeycomb structure according to any one of claims 1 to 4, The aforementioned honeycomb polygonal prism is surrounded by a metal foil material. Honeycomb structure.

7. In the honeycomb structure according to any one of claims 1 to 4, The aforementioned honeycomb structure is provided with a metal foil material around it. Honeycomb structure.

8. In the honeycomb structure according to any one of claims 1 to 4, The honeycomb polygonal prisms and honeycomb molded bodies constituting the aforementioned honeycomb structure are joined to each other with adhesive or filler. Honeycomb structure.

9. In the honeycomb structure according to any one of claims 1 to 4, A catalyst or gas adsorbent is supported on the honeycomb polygonal prisms and honeycomb molded bodies that constitute the aforementioned honeycomb structure. Honeycomb structure.

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