A profile, a cellular board made from profiles, an arrangement for a reinforced profile and a method for manufacturing thereof

Abstract

Generally, the present invention pertains to a profile (100) made from a single sheet, a cellular board (200) having airtight seams and a protective structure made from reinforced profiles, which protective structure may form a wall, a floor, a door, a ceiling and / or a roof. A profile (100) according to the present invention comprises two opposite side walls (102a, 102b), a rear wall (104) connecting said side walls (102a, 102b) and an open front part (106), wherein each side wall (102a, 102b) comprises first connecting means (108) comprising a groove part (110) and a folded part (112) being arranged outside of the profile (100), and second connecting means (114) comprising a hook part (116) being arranged inside of the profile (100).

Description

[0001] A PROFILE, A CELLULAR BOARD MADE FROM PROFILES, AN ARRANGEMENT FOR A REINFORCED PROFILE AND A METHOD FOR MANUFACTURING THEREOF

[0002] FIELD OF THE INVENTION

[0003] Generally, the present invention relates to a profile, a cellular board made from profiles, a protective structure and a method for manufacturing thereof. In particular, the present invention pertains to a profile made from a single sheet, a cellular board having airtight seams and a protective structure made from reinforced profiles, which protective structure may form a wall, a floor, a door, a ceiling and / or a roof.

[0004] BACKGROUND

[0005] Prior art knows different types of profiles and cellular boards made from these profiles. However, the known cellular boards still suffer from cumbersome and multi-step manufacturing process, which often requires the assembly of the profile from multiple parts. Furthermore, achieving airtight seams in these cellular boards can be challenging, leaving them susceptible to exposure to external weather conditions that may compromise their durability.

[0006] In addition, a profile, being assembled from several parts, may not necessarily provide sufficient rigidity for the cellular boards, in which case a structure to which the cellular board is fixed may have to be supported or protected in other ways.

[0007] There is a critical need, particularly for authorities such as the military and various government ministries, for a structure, such as a wall, a floor, a door, a ceiling and / or a roof, for example, that provides protection against radiation penetration, which is essential for preventing signal reconnaissance, blast waves from explosions, and intrusion, for example. These protective measures are vital for ensuring security and operational integrity. Typically, such structures are heavy and composed of steel-reinforced concrete, offering the necessary robustness and durability. However, the construction of these structures can be complex, expensive, and time-consuming. Therefore, there is a need for a lightweight and easily installable structure that can provide sufficient protection. SUMMARY OF THE INVENTION

[0008] The objective is to at least alleviate the problems described hereinabove not satisfactorily solved by the known arrangements, and to provide a feasible profile made from a single sheet, a cellular board having airtight seams and a lightweight and easily installable protective structure.

[0009] In this application, the term "profile" is defined as the profile described in patent application no. FI 20236267, including all its features. Therefore, in this application, the term "profile" refers to the profile presented in the aforementioned application.

[0010] The above-mentioned objective is achieved according to the present invention as claimed in claim 1.

[0011] The aforesaid objectives are also achieved according to the present invention as claimed in claim 5.

[0012] The aforesaid objectives are also achieved according to the present invention as claimed in claim 10.

[0013] Yet, the aforesaid objectives are also achieved according to the present invention as claimed in claim 17.

[0014] Yet, the aforesaid objectives are also achieved according to the present invention as claimed in claim 18.

[0015] Accordingly, in one aspect of the present invention a profile comprises two opposite side walls, a rear wall connecting said side walls and an open front part, wherein each side wall comprises first connecting means comprising a groove part and a folded part being arranged outside of the profile, and second connecting means comprising a hook part being arranged inside of the profile.

[0016] In one embodiment, the groove part is formed by pressing the side wall into the profile for accommodating the hook part of a second profile and at least a part of the folded part in a compressed position. This embodiment may enable seams that are airtight and sink into the side wall enabling an almost even side wall surface. In one embodiment, the folded part and the hook part are arranged at an angle relative to the side wall, which angle enables the folded part to retain the hook part of the second profile. This embodiment may facilitate the assembly of cellular boards and may enhance the automation of cellular board production by enabling easy joining of profiles.

[0017] In one embodiment, the profile is made from a single sheet. This embodiment is preferable, because it enables the production of a profile without seams and may increase the lateral stiffness of a cellular board made from profiles. The manufacturing of profiles from a single sheet may also enable further automated production, which in turn reduces the need for manpower.

[0018] In one embodiment, the profile is made of steel.

[0019] In another aspect of the present invention, a cellular board comprises a number of profiles according to the present invention.

[0020] In one embodiment, the cellular board comprises a seam having the folded part of a first profile and the hooked part of a second profile bent into the groove part of the first profile in the compressed position.

[0021] In one embodiment, the seam comprises a number of punched or stamped-out parts. This embodiment prevents the movement of the first profile and the second profile in the longitudinal direction of the seam.

[0022] Yet, in one embodiment at least a part of the profiles in a cellular board are filled with a material, such as an adhesive insulation material or a dense, adhesive insulation material. In another embodiment, the material is selected from a group consisting of polyurethane, polyurethane foam, polyisocyanurate, polyisocyanurate foam, phenolic, phenolic foam, and stone wool. The skilled person would understand that the list is not exhaustive and other materials can be used within the scope of the invention.

[0023] Accordingly, in one aspect of the present invention an arrangement for a reinforced profile comprises a profile and at least one rod, wherein said rod is positioned inside of the profile.

[0024] In one embodiment, the rod is a steel bar. Depending on the embodiment, the steel bar can be ribbed steel bar, high-strength steel bar, carbon steel bar or epoxy-coated steel bar for protecting it from corrosion. The skilled person will understand that other suitable, strong material can be used for manufacturing the rod.

[0025] In one embodiment, the length of the rod corresponds to the height of the profile. The profile is created by folding sheet metal. So, the rod's length directly corresponds to the vertical dimension of the resulting profile’s walls.

[0026] In one embodiment, the location of the rod inside the profile is selected so that it is equidistant from the first connecting means and the second connecting means of the profile. In another embodiment, the location of the rod inside of the profile is selected so that it is equidistant from the both side walls.

[0027] These embodiments make the profile more resistant to intrusion through its wall, which typically consists of a single sheet of metal. At the seams, the profile is reinforced with five layers of sheet metal, enhancing the resistance of the seams to penetration, and, when the gap between the seam and the rod is chosen to be small enough, the bar spacing prevents penetration without cutting the rod.

[0028] Additionally, positioning the rod centrally with respect to the side walls further impedes access to the rod due to the filling material inside the profile, in embodiments where filler material is used.

[0029] In one embodiment, the arrangement further comprises a top part and / or a bottom part to close the profile and / or to arrange the rod in a desired location in the profile.

[0030] Yet, in one embodiment, a part of the profile is filled with a material, such as an adhesive insulation material or a dense, adhesive insulation material. This embodiment makes it more difficult to breach the profile using power tools, as the filler material may easily block and disrupts the operation of the tools, thus, hindering their effectiveness and slowing down any attempt to break in.

[0031] In another aspect of the present invention, a protective structure comprising a number of said reinforced profiles according to the present invention.

[0032] In another aspect of the present invention, a method for manufacturing a profile according to the present invention, comprises at least the steps of

[0033] - forming two opposite side walls, a rear wall connecting said side walls, and an open front part by bending a sheet, forming a folded part in both of the side walls by folding a part of the side wall in half,

[0034] - arranging the folded part at an angle relative to the side wall,

[0035] - forming a groove part under the folded part by pressing a part of the side wall into the profile,

[0036] - forming a hook part by bending a part of the side wall inside at the open front part, and

[0037] - arranging the hook part at an angle relative to the side wall.

[0038] Yet, in one aspect of the present invention, a method for manufacturing a cellular board according to the present invention, comprises at least the steps of

[0039] - connecting a first profile and a second profile by arranging a second connecting means of the second profile into first connecting means of the first profile, and

[0040] - providing a seam in the cellular board by applying force to the connected first connecting means and the second connecting means by forcing the folded part of the first profile and the hooked part of the second profile to be pressed into the groove part of the first profile.

[0041] In one embodiment, the method further comprises a step of arranging a number of punched or stamped-out parts in the seam.

[0042] Yet, in one embodiment, the method further comprises a step of filling at least a part of the profiles with a material, such as an adhesive insulation material or a dense, adhesive insulation material.

[0043] The utility of the present invention follows from a plurality of factors, which vary depending on the specific embodiment. The cellular board made of profiles is durable and versatile. Automated manufacturing process for both profiles and cellular boards can result in faster production with reduced labor requirements.

[0044] The enhanced lateral stiffness of the cellular board, achieved through the use of seamless profiles, may equalize the tensions between the profiles in the cellular board This, in turn, can further improve the durability of the cellular board and enable its use in stiffening multi-story buildings. Filled cellular boards with a material, such as adhesive insulation material or a dense, adhesive insulation material, may significantly increase the transverse stiffness and improve the cellular board's resistance to compression, bending, shear, and support forces. Consequently, it may be possible to construct taller multi-story buildings using filled cellular boards according to the present invention, providing enhanced resistance to explosion, blasts, pressure, as well as improved protection against shrapnel and / or bullets.

[0045] The present invention also provides a lightweight structure that is not only easier and quicker to construct but also significantly lighter than traditional steel- reinforced concrete structures. This might make it more practical for various protective applications, such as preventing signal reconnaissance, blast waves from explosions, and intrusion.

[0046] The protective structure can be easy to install. It is also modular and movable, which makes the structure flexible and suitable for various applications such as walls, floors, doors, ceilings, and roofs.

[0047] The seams of the connected protective profiles comprise a five-fold steel plate, and at least one bar inside each profile, making it difficult to penetrate through the structure. By choosing the appropriate side width of the profile, it can be ensured that at least one rod must be cut before there is an opening in the profile through which a person can penetrate.

[0048] In addition, the profile being filled a material hinders the use of tools in intrusion attempts. This filling material slows down intrusion attempts, providing additional time to respond to the threat.

[0049] These features collectively contribute to the utility of the present invention, offering a versatile and robust solution for protective structures in various critical applications.

[0050] The expression “a number of’ refers herein to any positive integer starting from one (1), e.g. to one, two, or three.

[0051] The expression “a plurality of’ refers herein to any positive integer starting from two (2), e.g. to two, three, or four.

[0052] Different embodiments of the present invention are disclosed in the dependent claims. BRIEF DESCRIPTION OF THE RELATED DRAWINGS

[0053] Next the invention is described in more detail with reference to the appended drawings in which

[0054] Fig. 1 illustrates an embodiment of a profile in accordance with the present invention,

[0055] Fig. 2 illustrates an embodiment of a cellular board in accordance with the present invention,

[0056] Fig. 3 illustrates an enlarged view of area A from Fig. 2,

[0057] Fig. 4 illustrates a perspective view of an arrangement for a reinforced profile in accordance with the present invention, and

[0058] Fig. 5 illustrates a top view of the arrangement for a reinforced profile in accordance with the present invention.

[0059] Fig. 6 is a flow diagram of an embodiment of a method for manufacturing a profile in accordance with the present invention, and

[0060] Fig. 7 is a flow diagram of an embodiment of a method for manufacturing a cellular board in accordance with the present invention.

[0061] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0062] Figure 1 illustrates an embodiment of a profile in accordance with the present invention. A profile 100 according to the present invention comprises two opposite side walls 102a and 102b, a rear wall 104 connecting the side walls 102a and 102b and an open front part 106.

[0063] The side walls 102a and 102b form together with the rear wall 104 an inside space in the profile. The skilled person will understand that the term “outside of the profile” is outside of the inside space of the profile. In an embodiment, the profile 100 is made from a single sheet. The size and the thickness of the sheet can vary depending on the intended use of a cellular board formed by a number of profiles.

[0064] Furthermore, the choice of material for the profile may vary based on the intended application of the cellular board. In one embodiment, the profile is made of steel. It is understood that the specific type of steel is selected based on the requirements of the cellular board's purpose. For instance, stainless steel, carbon steel, weathering steel, alloy steel, and galvanized steel are commonly used for apartment building facades, for example, due to their specific properties.

[0065] In an embodiment, the length of the side walls is 165 mm, and the rear wall 100 mm in length. The profile has a thickness of 1.5 mm. It should be understood that these dimensions are provided for illustrative purposes only and do not limit the scope of the invention. The height of the profile can vary depending on the intended use of the cellular board.

[0066] Further, each side wall 102a and 102b comprises first connecting means 108 and second connecting means 114. The first connecting means 108 comprise a groove part 110 and a folded part 112, and it is arranged outside of the profile 100. The second connecting means 114 comprise a hook part 116, which is arranged inside of the profile 100.

[0067] The folded part 112 is arranged to retain the hook part 116 of a second profile, when forming a cellular board. The folded part is formed by folding a section of the sheet in half, resulting in the folded part in the form of a hook outside of the profile. The length of the folded part can vary depending on the specific embodiment. In an embodiment, the length of the folded part is 15 mm. It should be understood that this dimension is provided for illustrative purposes only and do not limit the scope of the invention.

[0068] In an embodiment, the groove part 110 is formed by pressing the side wall 102 into the profile 100. The depth of the groove part is selected so that it is able to accommodate a hook part 116 of the second profile and the folded part 112, when the hook part 116 and the folded part 112 are pressed in the groove part 110 in a compressed position.

[0069] The length of the groove part is selected corresponding to the length of the folded part and the hook part, so that in the compressed position a seam of two profiles formed by the first connecting means 108 of a first profile and the second connecting means 114 of the second profile is substantially level with the side walls of the first profile and the second profile. In an embodiment, the length of the groove part is 18,5 mm. It should be understood that this dimension is provided for illustrative purposes only and do not limit the scope of the invention.

[0070] In an embodiment, the folded part 112 and the hook part 116 are arranged at an angle relative to the side wall 102, which angle enables the folded part 112 to retain the hook part 116 of the second profile. Preferably, the angle is 10° - 45°. In an embodiment, the angle of the folded part varies from the angle of the hook part. In an embodiment, the angle of the folded part is 15°, and the angle of the hook part is 20°. It should be understood that these dimensions are provided for illustrative purposes only and do not limit the scope of the invention.

[0071] The first connecting means can be positioned on the side wall at a chosen location. However, in an embodiment where it is desired a seam to be as flat as possible with the side wall when two profiles are joined, the first connecting means are formed at the junction of the rear wall and the side wall. This configuration also minimizes the overlap of the profiles to be connected.

[0072] In an embodiment, the second connecting means 114 are formed in the profile by bending a part of the side wall 102 inside at the open front part 106. The length of the hook part 116 is chosen to correspond to the length of the folded part 112. In an embodiment, the length of the hook part is 14 mm. It should be understood that this dimension is provided for illustrative purposes only and do not limit the scope of the invention.

[0073] Fig. 2 illustrates an embodiment of a cellular board in accordance with the present invention. The cellular board 200 comprises a number of profiles 100a, 100b.

[0074] In an embodiment, the cellular board comprises a seam 202 having the folded part 112 of the first profile 100a and the hooked part 116 of the second profile 100b pressed into the groove part 110 of the first profile 100a in the compressed position.

[0075] The compressed position of the folded part 112 and the hooked part 116 is achieve by applying force to the connected folded part 112 and hooked part 116, causing the angle of the folded part 112 and the hooked part 116 in relation to the side wall to decrease and forcing them to be pressed into the groove part 110.

[0076] In an embodiment, the seam 202 further comprises a number of punched or stamped-out parts 204. Yet, in another embodiment, at least a part of the profiles of the cellular board are filled with a material, such as an adhesive insulation material or a dense, adhesive insulation material. In an embodiment, the material is selected from a group consisting of polyurethane, polyurethane foam, polyisocyanurate, polyisocyanurate foam, phenolic, phenolic foam, and stone wool. The skilled person would understand that the list is not exhaustive and other materials can be used within the scope of the invention.

[0077] Fig. 3 illustrates an enlarged view of area A from Fig. 2. A seam 202 of two connected profiles comprises at least the folded part 112 of the first profile and the hooked part 116 of the second profile pressed into the groove part 110 of the first profile in the compressed position, as described above.

[0078] Therefore, the seam 202 comprises five layers of sheet metal, which, depending on embodiment, can be steel, for example. For exemplary purposes only, if the thickness of the sheet metal is 1.5 mm, the total thickness of the seam would be 7.5 mm, making it difficult to penetrate through the seam.

[0079] Fig. 4 illustrates a perspective view and Fig. 5 a top view of an arrangement for a reinforced profile in accordance with the present invention. The side walls in the figures are transparent for illustrative purposes. The reinforced profile 400 comprises a profile 100 as disclosed above and at least one rod 404 positioned inside of the profile 100.

[0080] In an embodiment, the rod 404 is a steel bar, such as, but not limited to, a ribbed steel bar, high-strength steel bar, carbon steel bar or epoxy-coated steel bar for protecting it from corrosion. The skilled person will understand that other suitable, strong material can be used for manufacturing the rod.

[0081] In an embodiment, the length of the rod 404 corresponds to the height of the profile 100. The shape of the rod can vary. It can be circular in diameter or have a different shape. The preferred diameter of the rod is approximately 25 mm, but the skilled person will understand that the diameter can be larger or smaller as needed.

[0082] In an embodiment, the rod 404 inside the profile 100 is positioned equidistant from the first and second connecting means 108 and 114. In another embodiment, the rod 404 is positioned equidistant from both side walls 102a and 102b. The skilled person will understand that the rod can be positioned in some other way. For example, in embodiments comprising more than one rod, the rods can be positioned evenly filling the inner space of the profile. Preferably, the distance between a seam and a rod or a rod and a rod is chosen to be no more than 125 mm, which is small enough that the bar spacing prevents penetration without a need to cut the rod.

[0083] In an embodiment, the arrangement according to the present invention further comprises a top part and / or a bottom part 406 to close the profile 100 and / or to arrange the rod 404 in a desired location in the profile 100. The top part and / or the bottom part can be made of the same material as the profile, such as steel. The thickness of the top part and / or the bottom part can vary, but in an embodiment, it is preferably 10 mm providing an adequate support for placing the rod.

[0084] The skilled person will understand that the size of the top part and / or bottom part must be chosen so that the profiles can be connected. In other words, the top part and / or bottom part should not extend the second connecting means, as this would prevent the first connected means of another profile from being connected with the second connecting means of the profile in question.

[0085] In an embodiment, the top part and / or bottom part is / are formed to be one part and connected to the profiles after they have been connected together. In that embodiment, the rods are also assembled either to the top part or the bottom part before closing the connected profiles.

[0086] Yet, in another embodiment, at least a part of the profile is filled with a material, such as an adhesive insulation material or a dense, adhesive insulation material. In an embodiment, the material is selected from a group consisting of polyurethane, polyurethane foam, polyisocyanurate, polyisocyanurate foam, phenolic, phenolic foam, and stone wool. The skilled person will understand that the list is not exhaustive and other materials can be used within the scope of the invention.

[0087] In an embodiment, a number of said reinforced profiles according to the present invention are connected together to form a protective shielding. The profiles are connected as outlined above in the process of forming a cellular board. The protective structure of the present invention differs from the cellular board in that at least one bar is placed inside the profile, as disclosed above.

[0088] Fig. 6 is a flow diagram of an embodiment of a method for manufacturing a profile in accordance with the present invention. At 302, two opposite side walls, a rear wall connecting said side walls, and an open front part is formed by bending a sheet. Depending on an embodiment, the sheet can be a single sheet and made of steel, for example.

[0089] At 304, a folded part is formed in both of said side walls by folding a part of the side wall in half. In an embodiment, the folded part is formed at the junction of the rear wall and the side wall for minimizing the overlap of the profiles to be connected.

[0090] At 306, the folded part is arranged at an angle relative to said side wall. In an embodiment, the angle is selected to enable the folded part to retain the hook part of a second profile.

[0091] At 308, a groove part is formed under the folded part by pressing a part of the side wall into the profile. In an embodiment, the depth of the groove part is selected so that it is able to accommodate a hook part of a second profile and the folded part, when the hook part and the folded part are pressed in the groove part in a compressed position.

[0092] At 310, a hook part is formed by bending a part of the side wall inside at the open front part.

[0093] At 312, the hook part is arranged at an angle relative to the side wall.

[0094] The skilled person would understand that in automated manufacturing process two or more steps can be performed simultaneously.

[0095] Fig. 7 is a flow diagram of an embodiment of a method for manufacturing a cellular board in accordance with the present invention.

[0096] At 702, a first profile and a second profile are connected by arranging a second connecting means of the second profile into first connecting means of the first profile. In an embodiment, the first profile is pushed or pulled inside the second profile so that the hook parts of the second profile are engaged by the folded parts of the first profile on both sides of the first and second profiles.

[0097] In an embodiment, the method comprises means to slightly open or spread the second profile from its open front end in order to facilitate the insertion of the first profile's first connecting means inside the second profile. At 704, a seam is provided in the cellular board by applying force to the connected first connecting means and second connecting means by forcing the folded part of the first profile and the hooked part of the second profile to be pressed into the groove part of the first profile.

[0098] In an embodiment, the method further comprises a step of arranging a number of punched or stamped-out parts in the seam. The skilled person would understand that the distance between the punched or stamped-out parts can vary, but preferably falls within the range of approximately 1 cm to 10 cm, and more preferably between 3 cm and 5 cm. These punched or stamped-out parts are incorporated into the seam without piercing the material but instead deforming it, preferably every layer of the material, thereby preventing the movement of the profiles in the longitudinal direction of the seam.

[0099] In an embodiment, the method further comprises a step of filling at least a part of the profiles with a material, such as an adhesive insulation material or a dense, adhesive insulation material. In an embodiment, the material is selected from a group consisting of polyurethane, polyurethane foam, polyisocyanurate, polyisocyanurate foam, phenolic, phenolic foam, and stone wool. The skilled person would understand that the list is not exhaustive and other materials can be used within the scope of the invention.

[0100] Consequently, the skilled person may on the basis of this disclosure and general knowledge apply the provided teachings in order to implement the scope of the present invention as defined by the appended claims in each particular use case with necessary modifications, deletions, and additions.

Claims

AMENDED CLAIMS received by the International Bureau on 17 December 2024 (17.12.2024)1. A profile (100) comprising two opposite side walls (102a, 102b) , which are facing each other,, a rear wall (104) connecting said side walls and an open front part (106), characterized in that, each side wall comprises first connecting means (108) comprising a groove part (110) and a folded part (112) being arranged outside of said profile (100), and second connecting means (114) comprising a hook part (116) being arranged inside of said profile (100), wherein said profile is made from a single, bent sheet, wherein said groove part (110) is arranged, by pressing said side wall into said profile, for accommodating said hook part (116) of a second profile and at least a part of said folded part (112) in a compressed position.

2. The profile according to any preceding claim, wherein said folded part (112) and said hook part (116) are arranged at an angle relative to said side wall, which angle enables said folded part to retain said hook part of said second profile.

3. The profile according to any preceding claim, wherein said profile is made of steel.

4. A cellular board (200) comprising a number of profiles (100) of any of claims 1-3.

5. The cellular board according to claim 4, comprising a seam (202) having said folded part (112) of a first profile (100a) and said hooked part (116) of a second profile (100b) bent into said groove part (110) of said first profile in the pressed position.

6. The cellular board according to claim 5, wherein said seam comprises a number of punched or stamped-out parts (204).

7. The cellular board according to any of claims 4-6, wherein at least a part of said profiles are filled with a material, such as an adhesive insulation material or a dense, adhesive insulation material.

8. The cellular board according to claim 7, wherein said material is selected from a group consisting of polyurethane, polyurethane foam,polyisocyanurate, polyisocyanurate foam, phenolic, phenolic foam, and stone wool.

9. An arrangement for a reinforced profile characterized in that said arrangement comprises a profile according to any of claim 1 -3 and at least one rod, wherein said rod is positioned inside of said profile.

10. The arrangement according to claim 9, wherein said rod is a steel bar.

11. The arrangement according to any of claim 9-10, wherein the length of said rod corresponds to the height of said profile.

12. The arrangement according to any of claim 9-1, wherein the location of said rod inside of said profile is selected so that it is equidistant from said first connecting means and said second connecting means of said profile.

13. The arrangement according to any of claim 9-12, wherein the location of said rod inside of said profile is selected so that it is equidistant from said both side walls.

14. The arrangement according to any of claim 9-13, wherein the arrangement further comprises a top part and / or a bottom part to close said profile and / or to arrange said rod in a desired location in said profile.

15. The arrangement according to any of claim 9-14, wherein at least a part of said profile is filled with a material, such as an adhesive insulation material or a dense, adhesive insulation material.

16. A protective structure suitable for providing a protective shielding comprising a number of said reinforced profiles according to any of claim 9-15.

17. A method for manufacturing a profile according to any of claims 1-3, comprising at least the steps of- forming two opposite side walls, a rear wall connecting said side walls, and an open front part by bending a sheet (302),- forming a folded part in both of said side walls by folding a part of said side wall in half (304),- arranging said folded part at an angle relative to said side wall (306),forming a groove part under said folded part by pressing a part of said side wall into said profile (308),- forming a hook part by bending a part of said side wall inside at the open front part (310), and- arranging said hook part at an angle relative to said side wall (312).

18. A method for manufacturing a cellular board according to any of claims 4- 8, comprising at least the steps of- connecting a first profile and a second profile by arranging a second connecting means of said second profile into first connecting means of said first profile (402),- providing a seam in said cellular board by applying force to said connected first connecting means and second connecting means by forcing said folded part of said first profile and said hooked part of said second profile to be pressed into said groove part of said first profile (404).

19. The method of claim 18 further comprising a step of arranging a number of punched or stamped-out parts in said seam.

20. The method of any of claim 18-19 further comprising a step of filling at least a part of said profiles with a material.

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