Direct-seal can sealing structure and direct-seal can

Abstract

This utility model discloses a direct-seal can sealing structure and the direct-seal can itself, including a metal can body made of metal sheet and a sealing film for sealing the opening on the metal can body. The upper edge of the metal can body has a direct-seal rolled edge, which includes a first hollow outward rolled edge. The first hollow outward rolled edge includes an inclined sealing wall formed by extending outward from the metal can body, a support wall connected to the inclined sealing wall through a first curved wall and opposite in distance to the inclined sealing wall, and a second curved wall that bends inward from the end of the support wall and abuts against the metal can body. The inclined sealing wall is inclined upward and forms an adhesive surface. The middle of the support wall is recessed inward and abuts against the inclined sealing wall, dividing the space between the support wall and the inclined sealing wall into an upper cavity and a lower cavity. The sealing film is supported on the adhesive surface to seal the upper opening of the metal can body. This utility model has a stable structure, and the direct-seal rolled edge structure supporting the sealing film is stable and not easily deformed or twisted.

Description

Technical Field

[0001] This utility model relates to the field of metal packaging, and more particularly to the membrane sealing of metal direct-seal cans. Background Technology

[0002] Referring to Chinese Patent CN 202924067 U, a metal can is disclosed, including a ring-shaped lid structure and a can body. The can body has an opening at the top, and the ring-shaped lid structure cooperates with the opening. The edge of the opening is rolled outward to form a flange, and an aluminum foil layer is sealed on the flange, which can cover the entire opening. In this design, the aluminum foil layer needs to be sealed and pasted onto the flange on the can body. During sealing, the sealing device needs to press down on the flange, which results in a relatively large downward pressure, easily causing irreversible deformation of the flange and deformation of the sidewalls of the can body.

[0003] Referring to Chinese Patent CN112912318A, a can container is disclosed, including a metal can body and a sealing cap. The upper part of the metal can body is recessed to form an inclined wall to facilitate the installation of the sealing cap. The upper end of the inclined wall has a flange. When the sealing cap is placed on the metal can body and the cap is too tight, or when heavy objects are stacked on the can container, the sealing cap will apply a relatively large force to the flange. As a result, the flange will press down, causing the inclined wall and the vertical body of the metal can body to deform and bend, resulting in loosening between the top of the sealing cap and the flange, which affects the sealing effect.

[0004] To address this, engineers designed a new type of metal sealing can, referencing Chinese patent CN221439039U. In this can, the upper opening of the can body curls outward to form an outward-curving edge. A portion of the can body below the outward-curving edge bends inward to form an inner support wall that slopes upwards towards the outside of the can body. The outward-curving edge has an upward-facing support platform, and its end forms a curved portion that can be supported on the inner support wall. A buffer cavity is formed between the support platform and the curved portion. The sealing part seals the upper opening of the metal can body and is supported on the support platform. While this structure allows the sealing part, i.e., the sealing diaphragm, to be stably supported on the support platform at the top of the can body, the support platform must be sufficiently wide to stably adhere and support the sealing part. This inevitably results in a relatively large outward-curving edge, and the hollow area formed within the outward-curving edge has poor structural stability. Over time, this can easily cause the outward-curving edge to collapse, twist, and deform, affecting the sealing performance of the metal sealing can and making it inconvenient to stack and transport multiple metal sealing cans.

[0005] Therefore, there is an urgent need for a new straight can sealing structure that can solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a direct-seal can sealing structure and a direct-seal can, which has a stable structure and, even after long-term use, the direct-seal rolled edge structure supporting the sealing film remains stable and is not easily deformed or twisted.

[0007] To achieve the above objectives, this utility model provides a direct-seal can sealing structure, comprising a metal can body made of metal sheet and a sealing film for sealing the opening of the metal can body. The upper edge of the metal can body has a straight-sealed rolled edge, which includes a first hollow outer rolled edge connected to the metal can body and rolled outward. The first hollow outer rolled edge includes an inclined sealing wall extending outward from the metal can body, a support wall connected to the inclined sealing wall through a first curved wall and spaced opposite to the inclined sealing wall, and a second curved wall that bends inward from the end of the support wall and abuts against the metal can body. The inclined sealing wall is inclined upward and forms an adhesive surface. The middle of the support wall is recessed inward and abuts against the inclined sealing wall, dividing the space between the support wall and the inclined sealing wall into an upper cavity and a lower cavity. The sealing film is supported on the adhesive surface to close the upper opening of the metal can body.

[0008] Preferably, the second curved wall bends outward to form a second hollow outward rolled edge, the end of which bends into the lower cavity, and the second hollow outward rolled edge abuts against the side of the inclined sealing wall opposite to the supporting wall. This design results in two hollow outward rolled edges in the straight sealing edge of this invention, with the second hollow outward rolled edge curled inside the first hollow outward rolled edge. The second hollow outward rolled edge can powerfully support the inclined sealing wall from the underside, effectively increasing the stability and compressive strength of the straight sealing edge.

[0009] More preferably, the end of the second hollow outward rolled edge extends to the side of the support wall opposite to the inclined sealing wall. This design ensures the stability of the lower cavity in the straight sealing rolled edge and prevents the cavity in the straight sealing rolled edge from being squeezed and deformed.

[0010] Preferably, the metal can body is recessed inward near the straight sealing edge to form a necking platform, and the second curved wall abuts against the necking platform. The necking platform can effectively support the straight sealing edge, increase the pressure resistance of the straight sealing edge, and cause the opening of the metal can body to shrink inward, thereby increasing the sealing performance of the metal can body.

[0011] More preferably, the necking platform and the inclined sealing wall are connected by a third curved wall, forming an arc-shaped inner curved cavity between the necking platform and the third curved wall; the second curved wall extends outward to form a second hollow outer rolled edge, the shape of which partially matches and abuts against the third curved wall. This design allows the second hollow outer rolled edge to rotate relative to the inner curved cavity when the pressure on the straight sealing rolled edge is too high, and to recover under the elastic recovery ability of the second hollow outer rolled edge and the inner curved cavity after pressure contact, preventing the straight sealing rolled edge from twisting due to excessive pressure.

[0012] Specifically, the necking platform is arranged along the horizontal direction or horizontally upward of the metal can body, and the angle between the platform surface of the necking platform and the horizontal direction is greater than or equal to 0 degrees and less than or equal to 10 degrees, so that the straight sealing edge can effectively resist the downward pressure.

[0013] Preferably, the angle between the adhesive surface of the inclined sealing wall and the horizontal direction of the metal can body is 30 degrees to 60 degrees.

[0014] Specifically, the angle between the adhesive surface of the inclined sealing wall and the horizontal direction of the metal can body is 45±3 degrees.

[0015] Preferably, the width of the adhesive surface is 4.5 ± 0.1 mm. Of course, the width range of the adhesive surface can be set as needed, and is not limited to the above values.

[0016] Preferably, the adhesive surface is a straight surface with an inclined profile, which facilitates the adhesion and fixation of the sealing film. Of course, the adhesive surface can also be a slightly curved arc, and is not limited to a straight surface.

[0017] Preferably, the metal can body is a tin can body, a sheet metal can body, or an aluminum can body, etc., and the sealing film is a composite aluminum foil sheet, etc.

[0018] This utility model also provides a direct-seal can, including a metal can body with a thin metal sheet and a sealing film for sealing the opening on the metal can body. The metal can body includes a metal can body and a bottom cover. The bottom cover is installed at the lower opening of the metal can body. The bottom cover and the metal can body are an integral structure or the bottom cover and the metal can body are welded together. The metal can body and the sealing film form the direct-seal can sealing structure as described above.

[0019] Compared with the prior art, this utility model has a hollow straight-sealing edge in which the outer support wall is recessed inward so that its middle part abuts against the inclined sealing wall on the inner side of the sealing edge. This creates a triangular support structure in the middle of the straight-sealing edge, making the straight-sealing edge structure stable and less prone to deformation and twisting. This allows the straight-sealing edge to more effectively support the sealing film, thereby increasing the long-term sealing performance of the straight-sealed can and preventing deformation of the straight-sealing edge due to excessive force when multiple straight-sealed cans are stacked during transportation. Attached Figure Description

[0020] Figure 1 This is a perspective view of the direct-seal can of this utility model.

[0021] Figure 2 This is an exploded view of the direct-seal can of this utility model.

[0022] Figure 3 This is a cross-sectional view of the direct-seal can of this utility model from one angle.

[0023] Figure 4 yes Figure 3 Enlarged view of part a.

[0024] Figure 5 This is a cross-sectional view of the direct-seal can of this utility model from another angle.

[0025] Figure 6 yes Figure 5 Enlarged view of part b in the middle. Detailed Implementation

[0026] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] refer to Figures 1 to 3 This utility model discloses a direct-seal can 100, which includes a metal can body with a thin metal sheet and a sealing film 12 for sealing the opening on the metal can body. The metal can body includes a metal can body 11 and a bottom cover. The bottom cover is installed at the lower opening of the metal can body 11. The bottom cover and the metal can body 11 are an integral structure or the bottom cover and the metal can body 11 are welded together.

[0028] refer to Figures 1 to 6The upper edge of the metal can body 11 has a straight sealing rolled edge 13. The straight sealing rolled edge 13 includes a first hollow outer rolled edge 20 that is connected to the metal can body 11 and rolled outward. The first hollow outer rolled edge 20 includes an inclined sealing wall 21 that extends outward from the metal can body 11, a support wall 23 that is connected to the inclined sealing wall 21 through a first curved wall 22 and is spaced opposite to the inclined sealing wall 21, and a second curved wall 24 that bends inward from the end of the support wall 23 and abuts against the metal can body 11. The inclined sealing wall 21 is inclined upward and forms an adhesive surface 211. The middle of the support wall 23 is recessed inward and abuts against the inclined sealing wall 21, and divides the space between the support wall 23 and the inclined sealing wall 21 into an upper cavity 31 and a lower cavity 32. The sealing film 12 is supported on the adhesive surface 211 to close the upper opening of the metal can body 11.

[0029] refer to Figure 4 and Figure 6 The second curved wall 24 bends outward to form a second hollow outward rolled edge 30. The end of the second hollow outward rolled edge 30 bends into the lower cavity 32, and the second hollow outward rolled edge 30 abuts against the side of the inclined sealing wall 21 opposite to the supporting wall 23. This design results in the straight sealing rolled edge 13 of this invention having two hollow outward rolled edges, and the second hollow outward rolled edge 30 is rolled inside the first hollow outward rolled edge 20. The second hollow outward rolled edge 30 can powerfully support the inclined sealing wall 21 from below, effectively increasing the stability and pressure resistance of the straight sealing rolled edge 13.

[0030] refer to Figure 4 and Figure 6 The end of the second hollow outer rolled edge 30 extends to the side of the support wall 23 opposite to the inclined sealing wall 21. This design ensures the stability of the lower cavity 32 in the straight sealing rolled edge 13 and prevents the cavity in the straight sealing rolled edge 13 from being squeezed and deformed.

[0031] refer to Figure 4 and Figure 6 The metal can body 11 is recessed inward near the straight sealing edge 13 to form a necking platform 41. The second curved wall 24 abuts against the necking platform 41. The necking platform 41 can effectively support the straight sealing edge 13, increase the pressure resistance of the straight sealing edge 13, and cause the opening of the metal can body 11 to shrink inward, thereby increasing the sealing performance of the metal can body 11.

[0032] refer to Figure 4 and Figure 6The necking platform 41 and the inclined sealing wall 21 are connected by a third curved wall 42, forming an arc-shaped inner curved cavity 43 between the necking platform 41 and the third curved wall 42. The second curved wall 24 extends outward to form a second hollow outer rolled edge 30, and part of the shape of the second hollow outer rolled edge 30 matches and abuts against the third curved wall 42. This design allows the second hollow outer rolled edge 30 to rotate relative to the inner curved cavity 43 when the pressure on the straight sealing rolled edge 13 is too high. After being pressed into contact, it recovers under the elastic recovery ability of the second hollow outer rolled edge 30 and the inner curved cavity 43, preventing the straight sealing rolled edge 13 from twisting due to excessive pressure.

[0033] refer to Figure 4 and Figure 6 The necking platform 41 is arranged along the horizontal direction or horizontally upward of the metal can body 11, and the angle between the platform surface of the necking platform 41 and the horizontal direction is greater than or equal to 0 degrees and less than or equal to 10 degrees, so that the straight sealing edge 13 can effectively resist the downward pressure.

[0034] The angle between the adhesive surface 211 of the inclined sealing wall 21 and the horizontal direction of the metal can body 11 is 30-60 degrees. In this embodiment, the angle between the adhesive surface 211 of the inclined sealing wall 21 and the horizontal direction of the metal can body 11 is 45±3 degrees.

[0035] In this embodiment, the width of the adhesive surface 211 is 4.5 ± 0.1 mm. Of course, the width of the adhesive surface 211 can be set as needed and is not limited to the above value. The adhesive surface 211 is a straight surface with an inclined profile, which is beneficial for the adhesion and fixation of the sealing film 12. Of course, the adhesive surface 211 can also be a slightly curved arc, and is not limited to a straight surface.

[0036] The metal can body 11 is a tin can body, a sheet metal can body, or an aluminum can body, etc., and the sealing film 12 is a composite aluminum foil sheet, etc.

[0037] Compared with the prior art, the present invention has a hollow straight sealing edge 13 in which the middle of the outer support wall 23 is recessed so that its middle abuts against the inclined sealing wall 21 on the inner side of the sealing edge. This forms a triangular support structure in the middle of the straight sealing edge 13, making the straight sealing edge 13 structurally stable and less prone to deformation and twisting. This allows the straight sealing edge 13 to more effectively support the sealing film 12, thereby increasing the long-term sealing performance of the straight sealing can and preventing deformation of the straight sealing edge 13 due to excessive force when multiple straight sealing cans are stacked during transportation.

[0038] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A straight- side can end structure comprising a metal can body made of a metal skin and an end closure membrane sealing an opening in the metal can body, characterized by: The upper edge of the metal can body has a straight sealing rolled edge, which includes a first hollow outer rolled edge connected to the metal can body and rolled outward. The first hollow outer rolled edge includes an inclined sealing wall extending outward from the metal can body, a support wall connected to the inclined sealing wall through a first curved wall and opposite to the inclined sealing wall in terms of distance, and a second curved wall that bends inward from the end of the support wall and abuts against the metal can body. The inclined sealing wall is inclined upward and forms an adhesive surface. The middle of the support wall is recessed inward and abuts against the inclined sealing wall, dividing the space between the support wall and the inclined sealing wall into an upper cavity and a lower cavity. The sealing film is supported on the adhesive surface to close the upper opening of the metal can body.

2. The direct-seal can sealing structure as described in claim 1, characterized in that: The second curved wall bends outward to form a second hollow outward rolled edge. The end of the second hollow outward rolled edge bends into the lower cavity, and the second hollow outward rolled edge abuts against the side of the inclined sealing wall opposite to the supporting wall.

3. The direct-seal can sealing structure as described in claim 2, characterized in that: The end of the second hollow outward rolled edge extends to the side of the support wall opposite to the inclined sealing wall.

4. The direct-seal can sealing structure as described in claim 1, characterized in that: The metal can body is recessed inward near the straight sealing edge to form a necking platform, and the second curved wall abuts against the necking platform.

5. The direct-seal can sealing structure as described in claim 4, characterized in that: The necking platform and the inclined sealing wall are connected by a third curved wall, so that an arc-shaped inner curved cavity is formed between the necking platform and the third curved wall; the second curved wall bends outward to form a second hollow outward rolled edge, and part of the shape of the second hollow outward rolled edge matches and abuts the third curved wall.

6. The direct-seal can sealing structure as described in claim 4, characterized in that: The necking platform is arranged along the horizontal direction or horizontally upward along the metal can body, and the angle between the platform surface of the necking platform and the horizontal direction is greater than or equal to 0 degrees and less than or equal to 10 degrees.

7. The direct-seal can sealing structure as described in claim 1, characterized in that: The angle between the adhesive surface of the inclined sealing wall and the horizontal direction of the metal can body is 30-60 degrees.

8. The direct-seal can sealing structure as described in claim 7, characterized in that: The angle between the adhesive surface of the inclined sealing wall and the horizontal direction of the metal can body is 45±3 degrees.

9. The direct-seal can sealing structure as described in claim 1, characterized in that: The width of the adhesive surface is 4.5±0.1mm; the adhesive surface is a straight surface with an incline; the metal can body is a tin can body, a sheet metal can body, or an aluminum can body; and the sealing film is a composite aluminum foil sheet.

10. A direct-seal can, characterized in that: The device includes a metal can with a thin metal sheet and a sealing film for sealing the opening on the metal can. The metal can includes a metal body and a bottom cover. The bottom cover is installed at the lower opening of the metal body. The bottom cover and the metal body are an integral structure or the bottom cover and the metal body are welded together. The metal body and the sealing film form a direct-seal can sealing structure as described in any one of claims 1-9.

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