Three-piece can

Abstract

The utility model provides a three-piece can, and relates to the technical field of metal packaging. The can body of the three-piece can is in a square and round concave-convex shape. According to the three-piece can, the holding feeling of the can body can be improved, slipping can be prevented, meanwhile, the structural strength and attractiveness of the three-piece can can be enhanced, and the user experience is improved.

Description

Technical Field

[0001] This application relates to the field of metal packaging technology, and more particularly to a three-piece can. Background Technology

[0002] Metal packaging primarily utilizes metal materials (such as aluminum, steel, and stainless steel) to manufacture various packaging containers, components, and equipment, holding a significant position in the packaging industry. Among metal packaging options, three-piece cans are a type of can product formed by pressing, bonding, or welding thin metal sheets.

[0003] Currently, three-piece cans are typically made of tinplate, with a cylindrical body, a bottom lid, and an easy-open top lid, forming a three-piece tinplate can. This classic cylindrical three-piece can has the problem of being inconvenient to grip. Utility Model Content

[0004] In view of the above problems, this application provides a three-piece can that can improve grip comfort, enhance user experience and product value.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] This application provides a three-piece can with a square-round concave-convex shape for the can body.

[0007] In one possible implementation, the two ends of the can are round, and the middle part of the can is square.

[0008] In one possible implementation, the outer surface of the middle portion of the can body is provided with recesses and / or protrusions.

[0009] In one possible implementation, the top cover and body of the three-piece can are smoothly connected, and the bottom cover and body of the three-piece can are rounded at the connection point.

[0010] In one possible implementation, the center of the bottom cover of the three-piece can is recessed into the interior of the three-piece can.

[0011] In one possible implementation, the top cover of the three-piece can has several protruding structures that are recessed or protruding into the cavity.

[0012] In one possible implementation, a tearable portion is provided on one side of the protruding structure.

[0013] In one possible implementation, the top of the three-piece can is also equipped with a dust cover.

[0014] In one possible implementation, the dust cover has an array of threaded structures.

[0015] In one possible implementation, the dust cover also has an opening mechanism.

[0016] The three-piece can provided in this embodiment offers better grip points through its square-round-concave-convex shape, allowing fingers to fit more naturally against the can, thus improving grip stability and comfort. Simultaneously, the concave-convex surface structure increases friction, reducing the likelihood of the can slipping in the hand and effectively preventing it from falling. In summary, this three-piece can not only improves functionality but also provides a novel design in terms of visual and tactile appeal, enhancing the user experience.

[0017] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the three-piece can provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Front and rear views of a three-piece can provided for embodiments of this application;

[0020] Figure 2 Left / right view of a three-piece can provided for an embodiment of this application;

[0021] Figure 3 A top view of a three-piece can provided in an embodiment of this application;

[0022] Figure 4 A bottom view of a three-piece can provided in an embodiment of this application;

[0023] Figure 5 A left-hand side view of a three-piece can provided in an embodiment of this application;

[0024] Figure 6 A right axonometric view of a three-piece can provided in an embodiment of this application;

[0025] Figure 7 A front view of a three-piece can with a dust cover provided for an embodiment of this application;

[0026] Figure 8A rear view of a three-piece can with a dust cover provided for an embodiment of this application;

[0027] Figure 9 A left view of a three-piece can with a dust cover provided for an embodiment of this application;

[0028] Figure 10 A left-side view of a three-piece can with a dust cover provided for an embodiment of this application;

[0029] Figure 11 The right axonometric view of a three-piece can with a dust cover provided for an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-Three-piece can;

[0032] 110 - Can body; 111 - Depression; 112 - Protrusion;

[0033] 120 - Top cover; 121 - Protruding structure; 122 - Tearable part;

[0034] 130 - Bottom cover;

[0035] 140 - Dust cover; 141 - Threaded structure; 142 - Opening part; 143 - Anti-theft ring; 144 - Hinge. Detailed Implementation

[0036] Metal packaging primarily utilizes metal materials (such as aluminum, steel, and stainless steel) to manufacture various packaging containers, components, and equipment, holding a significant position in the packaging industry. Among metal packaging options, three-piece cans are a type of can product formed by pressing, bonding, or welding thin metal sheets.

[0037] Three-piece cans are a common type of metal packaging container, typically made of tinplate, and mainly composed of three parts: the can body, the bottom lid, and the top lid. Specifically, the can body is usually a rectangular metal sheet rolled into a cylinder, and then the edges are joined together by welding, stitching, or gluing to form a hollow cylinder. The bottom lid is a metal cap that closes the bottom of the can body, usually fixed to the can body by rolling or welding. The top lid corresponds to the bottom lid, being a metal cap that closes the top of the can body, also fixed to the can body by rolling or welding. This classic cylindrical three-piece can presents the problem of being inconvenient to grip.

[0038] Based on the aforementioned technical problems, this application provides a three-piece can. Considering that the conventional three-piece can has a straight cylindrical body, which makes it inconvenient to grip, changing the shape of the can body to a square-round shape can provide better gripping points, allowing fingers to fit more naturally against the can body, improving grip stability and comfort. Simultaneously, the straight cylindrical can body is prone to slipping when the user's hands are wet or oily. Adding a textured surface to the can body can increase surface friction, reducing the likelihood of the can slipping in the hand.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] See Figures 1 to 6 , Figure 1 Front and rear views of a three-piece can provided in an embodiment of this application; Figure 2 Left / right view of a three-piece can provided for an embodiment of this application; Figure 3 A top view of a three-piece can provided in an embodiment of this application; Figure 4 A bottom view of a three-piece can provided in an embodiment of this application; Figure 5 A left-hand side view of a three-piece can provided in an embodiment of this application; Figure 6 This is a right axonometric view of a three-piece can provided in an embodiment of this application.

[0041] Please see Figures 1 to 2 This application provides a three-piece can 100, the body of which 110 has a square-round concave-convex shape. Specifically, the square-round concave-convex shape is a design that combines square and circular geometric features.

[0042] For example, the protrusions and depressions on the can body 110 can be regularly arranged protrusions 112 and depressions 111, similar to wavy, rhomboid, grid or other geometric patterns. This structure can be evenly distributed across the entire surface of the can body 110 or concentrated in a specific area.

[0043] In this embodiment, the square-round concave-convex shape can be expressed as some parts of the can body 110 being circular while other parts are square, or a square concave-convex structure can be added to the circular can body 110.

[0044] In some embodiments, the material used to manufacture the three-piece can 100 is not limited. Exemplarily, the can body 110 may be made of tinplate or aluminum to provide good strength and corrosion resistance. Alternatively, the choice of material may be adjusted according to specific application requirements.

[0045] In this embodiment, the tank body 110 can be manufactured using an expansion forming process, which involves applying internal pressure to shape a metal sheet in a mold, thereby creating a square or round, concave-convex shape. This expansion forming process enables the creation of complex geometric shapes that are difficult to achieve with traditional stamping or rolling processes, while also allowing for precise control of material flow and deformation, thus improving material utilization and reducing waste.

[0046] It should be noted that when the shape of the can body 110 is a square-round symmetrical structure, and the concave and convex parts on its surface are symmetrically distributed, the front view and rear view of the three-piece can 100 are the same, and its left view and right view are the same.

[0047] Please see Figures 3 to 6 In this embodiment, the two ends of the can body 110 are round, and the middle part of the can body 110 is square.

[0048] Understandably, the rounded ends help maintain the overall structural stability and strength of the can, allowing it to withstand greater internal pressure compared to a completely square design, making it suitable for packaging requiring airtight seals. The square shape in the middle provides better grip points, making the can easier to hold during use.

[0049] In some embodiments, the shape of the square in the middle portion is not limited. For example, the square can be hexagonal, octagonal, etc., which helps to achieve a unique visual effect.

[0050] Understandably, this design, which combines circles and squares, is more visually appealing and has good application prospects. Furthermore, the square middle section can improve the stacking efficiency of the tanks during transportation and storage, reducing space waste, thus making it widely applicable.

[0051] In some embodiments, the can body 110 may also be printed and coated to enhance corrosion resistance and display effect, while its uneven surface may also be used to display specific decorative effects, such as embossed patterns.

[0052] In this embodiment, the outer surface of the middle portion of the can body 110 is provided with a recess 111 and / or a protrusion 112.

[0053] The arrangement of the recesses 111 and protrusions 112 is not further limited. For example, the recesses 111 and / or protrusions 112 are arranged centrally symmetrically on the outer surface of the middle portion of the can body 110, that is, the recesses 111 and protrusions 112 are arranged alternately at regular intervals, thereby regularly increasing the grip of the can body 110 and preventing slippage. Alternatively, the recesses 111 and protrusions 112 can also be arranged in a spiral along the middle portion of the can body 110, thereby visually guiding the eye. Alternatively, they can be arranged in a grid pattern, forming a checkerboard-like pattern, thereby providing uniform structural strength and appearing visually neat and orderly.

[0054] It should be noted that the recesses 111 and / or protrusions 112 on the outer surface of the middle part of the can body 110 can be designed into specific shapes and arrangements according to functional requirements, such as stripes for increasing friction or patterns for decoration.

[0055] It is understandable that by providing recesses 111 and / or protrusions 112 on the outer surface of the middle portion of the tank body 110, the geometry of the tank body 110 is changed to distribute pressure, thereby increasing the structural strength and pressure resistance of the tank body 110 and reducing the possibility of deformation.

[0056] Please see Figures 1 to 2 , Figures 5 to 6 In this embodiment, the top cover 120 and the can body 110, and the bottom cover 130 and the can body 110 are smoothly connected, and the connection is provided with rounded corners.

[0057] Among them, the smooth connection and rounded corner design give the three-piece can 100 a streamlined appearance. Specifically, the top cover 120 and the can body 110, and the bottom cover 130 and the can body 110 are connected by rounded corners, making the connection between the top cover 120, the can body 110 and the bottom cover 130 more natural, eliminating sharp edges, reducing the risk of scratching fingers or other parts during use, and improving safety.

[0058] In some embodiments, the radius of the rounded corners can be adjusted according to different application scenarios. For example, larger rounded corners can be used in applications requiring higher strength and safety, while smaller rounded corners are suitable for products requiring a more compact design. Furthermore, the rounded corner area can also be enhanced with functional designs or decorative treatments, such as adding sealing ring grooves at the rounded corners, or polishing, electroplating, etc., to increase the aesthetics and corrosion resistance of the three-piece can 100.

[0059] Understandably, the smooth connection between the top cover 120 and the tank body 110, and the bottom cover 130 and the tank body 110, with rounded corners at the connection points, can effectively disperse the stress at the connection points of various parts, reduce material fatigue or damage caused by stress concentration, and improve the durability of the tank.

[0060] In some embodiments, the connection method between the top cover 120 and the tank body 110, and between the bottom cover 130 and the tank body 110, is not further limited. Exemplarily, the connection between the tank body 110 and the bottom cover 130 and the top cover 120 can be achieved by means of rolling, welding or bonding, etc., to ensure the sealing and structural integrity of the entire tank.

[0061] Please see Figure 4 and Figure 6 In this embodiment, the center of the bottom cover 130 of the three-piece can 100 is recessed into the interior of the three-piece can 100, thereby enhancing the structural strength and stability of the can.

[0062] In some embodiments, the shape of the recess at the center of the bottom cover 130 of the three-piece can 100 is not limited. For example, it can be a circular recess, which can evenly distribute stress and withstand internal and external pressure; or it can be an elliptical recess, which can provide additional strength in a certain direction; or it can be a polygonal recess, such as a hexagon, to provide better structural stability.

[0063] Correspondingly, the outer surface of the recess can also protrude around the outside of the three-piece can 100, thereby stabilizing the can and preventing it from tipping over. It should be noted that the height of the protrusion does not exceed the thickness of the bottom cover 130, to prevent it from protruding too much and failing to stabilize the can body 110.

[0064] In some embodiments, the size and depth of the recess are not limited and can be adjusted according to the overall size of the three-piece can 100. Similar to the protrusions mentioned above, the depth of the recess needs to take into account the size and height of the can body 110 and the bottom cover 130 to prevent excessive reduction of the internal usable space.

[0065] Understandably, the recessed design of the center of the bottom cover 130 of the three-piece can 100 can lower the center of gravity of the can, improve its stability when placed, and reduce the possibility of tipping over.

[0066] Please see Figure 3 and Figure 5 In one possible implementation, the top cover 120 of the three-piece can 100 is provided with a plurality of protruding or recessed structures 121 that extend into the cavity. The protruding structures 121 can increase the friction of the top cover 120 as an anti-slip design, and at the same time, they fit tightly with the edge of the top cover 120 to enhance the sealing performance of the top cover 120, prevent air or moisture from entering the can, maintain the freshness of the contents, and help the user to tear or peel off the top cover 120 more easily.

[0067] In some embodiments, the shape of the protrusion structure 121 is not limited. Exemplarily, the protrusion structure 121 can adopt a variety of geometric shapes, such as circles, stars, waves, or other unique patterns, to achieve different visual effects and functional requirements. It can also be designed as wave-shaped, sawtooth-shaped, square, or other easy-to-grip shapes to facilitate user operation.

[0068] Furthermore, the protruding structure 121 can be made of flexible material to provide a good feel and control when opening. Thus, based on the metal material of the top cover 120 of the three-piece can 100, a multi-layer composite material is used to improve sealing performance and durability.

[0069] In some embodiments, indicator markings, such as arrows or the word "tear open," may be added to the protruding structure 121 to guide the user to open it correctly, and it may be designed as a reusable sealing structure.

[0070] Please continue reading. Figure 3 and Figure 5 In one possible implementation, a tearable portion 122 is provided on one side of the protruding structure 121, which facilitates the user to quickly and easily open the top cover 120 (i.e., the sealing layer), improving ease of use. Furthermore, the density of the protruding structure 121 on the tearable portion 122 is less than that on other parts. At the same time, no protruding structure 121 is provided on the other side corresponding to the tearable portion 122, which can guide the user to tear the top cover 120 to that side for resealing, so that the user can reseal the can after taking out part of the contents.

[0071] In some embodiments, the tearable portion 122 can be designed in different shapes and sizes to suit different product needs and consumer preferences. Exemplarily, it can be designed as a ring, a strip, or other easy-to-grip shape.

[0072] In some embodiments, the top cover 120 is typically made of tinplate or aluminum, and the protruding structure 121 is formed by stamping or hydroforming. This protruding structure 121 may be coated to improve corrosion resistance, and markings or other decorative elements may be added to the protruding area to enhance recognizability. Additionally, vents or other functional structures may be provided in the protruding area.

[0073] For example, the three-piece can 100 is suitable for powdered or granular products that need to be stored for a long time, such as milk powder and coffee powder. Users can open the top cover 120 through the tearable part 122, tear it to the preset position, take out the contents of the can, and then close the top cover 120 again to prevent moisture.

[0074] See Figures 7 to 11 , Figure 7A front view of a three-piece can with a dust cover provided for an embodiment of this application; Figure 8 A rear view of a three-piece can with a dust cover provided for an embodiment of this application; Figure 9 A left view of a three-piece can with a dust cover provided for an embodiment of this application; Figure 10 A left-side view of a three-piece can with a dust cover provided for an embodiment of this application; Figure 11 The right axonometric view of a three-piece can with a dust cover provided for an embodiment of this application.

[0075] It should be noted that in this embodiment, the description mainly focuses on the dust cover 140. The bottom view of the three-piece can 100 with the dust cover 140 is shown in the figure. Figure 4 Similarly, the right view of the three-piece can 100 with a dust cover 140 is the same as... Figure 9 symmetry.

[0076] Please see Figures 7 to 11 In one possible implementation, the top cover 120 of the three-piece can 100 is also provided with a dust cover 140 to provide additional protection against dust and contaminants from entering the can, keeping the contents clean and enhancing the hygiene and safety of the product.

[0077] In some embodiments, the dust cover 140 may be a removable or flip-up cover that covers the top cover 120 and is attached to the can by snaps, hinges, or other securing methods. Furthermore, the dust cover 140 may be made of plastic, metal, or other suitable materials to ensure it is lightweight, durable, and easy to clean.

[0078] In some embodiments, the shape and color of the dust cover 140 are not limited. Exemplarily, it may be designed to be transparent to show the design of the top cover 120, or the color of the contents may be used to enhance visual recognition.

[0079] Furthermore, the dust cover 140 can also integrate other functions, such as a bottle opener, measuring cup, or other practical tools, to increase the added value of the product.

[0080] Understandably, by providing a dust cover 140 on the top cover 120 of the three-piece can 100, the three-piece can 100 can be used for packaging a variety of products, including high-end foods, beverages, cosmetics and chemicals, and this design offers significant advantages, especially in applications that require high hygiene standards and protective functions.

[0081] In this embodiment, the dust cover 140 is provided with an array of threaded structures 141. The threaded structures 141 can be a series of spiral protrusions or grooves on the inner or outer side of the dust cover. These threads correspond to and fit the top cover 120 and the can body 110, with their sizes matching each other to achieve rotational fixation. The array of threaded structures 141 enhances the fixation of the dust cover, prevents loosening, and facilitates rotation and disassembly by the user.

[0082] Therefore, the threaded structure 141 is typically made of the same material as the dust cover 140, such as plastic or metal, to ensure its durability and compatibility. At the same time, the array of threaded structures 141 increases the friction between the dust cover 140 and the hand, making opening the cover easier.

[0083] In some embodiments, the threaded structure 141 can be designed with different pitches and depths for different tank heights 110 to accommodate different sealing requirements and user preferences. It can also be designed with double threads or other complex structures to enhance functionality.

[0084] Furthermore, based on the threaded structure 141, the dust cover 140 can integrate other functions, such as an anti-slip design or an additional sealing gasket, to further improve sealing performance.

[0085] In one possible implementation, the dust cover 140 is also provided with an opening part 142, which makes it easy for users to quickly open the dust cover 140, improves the convenience and efficiency of use, and enhances the user experience.

[0086] In some embodiments, the opening portion 142 may be a specially designed area that allows a user to grip and apply force to open the dust cover 140. It may be a raised handle, a recessed finger groove, or other easy-to-operate structure. The opening portion 142 is typically integrally molded with the dust cover 140, using the same material, such as plastic or metal, to ensure structural integrity and durability.

[0087] In this embodiment, the opening part 142 is provided with an indicator mark, namely the word "OPEN", to prompt the user that it can be opened through this position.

[0088] In some embodiments, the opening portion 142 can be designed in different shapes and sizes, such as a ring handle, a strip groove, or a push-button, to suit different user needs and product characteristics.

[0089] Furthermore, the opening portion 142 can also integrate other functions, such as an anti-slip design or spring-assisted opening, to further improve the convenience and safety of operation.

[0090] Understandably, by providing an opening portion 142 on the dust cover 140, a clear gripping point is offered, allowing users to easily open the dust cover and improving ease of use. At the same time, the well-designed opening portion 142 ensures safety during the opening process, reducing the risk of accidental slippage or damage. Furthermore, this design considers user operating habits, providing a better user experience, especially for elderly users or those with less hand strength.

[0091] It should be noted that a complete anti-theft ring 143 (i.e., a break ring) can also be provided on the dust cover 140 below the opening part 142, providing anti-tampering function and ensuring that the user can clearly see whether the dust cover 140 has been opened before the dust cover 140 is opened for the first time.

[0092] Specifically, the tamper-evident ring 143 separates from the body of the dust cap 140 when the dust cap 140 is first opened, typically through a series of break points or weak points. This design ensures that once the dust cap 140 is opened, the tamper-evident ring 143 remains on the can opening, providing a visual cues. Before opening, the tamper-evident ring 143 helps maintain the seal of the dust cap 140, preventing leakage or contamination of the contents.

[0093] In some embodiments, the anti-theft ring 143 is typically integrally formed with the dust cover 140, and is made of materials such as plastic and manufactured by injection molding.

[0094] Understandably, the design of the tamper-evident ring 143 is intended to prevent unauthorized opening, and it is particularly suitable for product packaging such as food, beverages, and pharmaceuticals, where safety requirements are high.

[0095] Please continue reading. Figures 7 to 11 Correspondingly, a hinge 144 (i.e., a snap fastener) is also provided on the dust cover 140 at a position symmetrical to the opening part 142. When the dust cover 140 is opened, it remains connected to the anti-theft ring 143, allowing the dust cover 140 to be flipped or lifted when opened, while still connected to the anti-theft ring 143, rather than being completely separated.

[0096] In some embodiments, the hinge 144 is typically designed to be flexible and durable to withstand repeated opening and closing. Exemplarily, the hinge 144 structure is typically made of durable materials capable of withstanding multiple opening and closing operations, thereby extending the service life of the dust cover 140.

[0097] For example, when quick access to the contents is required, the user can operate the dust cover 140 with one hand via the hinge 144, improving the user experience of the product.

[0098] In this embodiment, the opening part 142 and the hinge 144 form a simple opening and closing mechanism, which can be achieved by pressing, lifting or other means, so that the user can easily open the dust cover 140.

[0099] Understandably, the hinge 144 keeps the dust cover 140 always connected to the tank. The design of the hinge 144 effectively prevents the dust cover 140 from being lost, which is especially important for products that need to be kept clean and dust-free.

[0100] The three-piece can 100 provided in this embodiment has a can body 110 with a square-round concave-convex shape. That is, the two ends of the can body 110 are round, while the middle part is square. This design combines the advantages of round and square shapes. The round ends provide good structural strength and sealing, while the square middle part increases the effective utilization of storage space and facilitates stacking and storage. At the same time, the concave-convex structure increases the grip of the can body 110, prevents slippage, and enhances structural strength and aesthetics.

[0101] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0102] In the description of this application, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or that are inherent to such process, method, product, or apparatus.

[0103] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A three-piece can, characterized in that, The three-piece can has a square-round concave-convex shape. The outer surface of the middle portion of the tank body is provided with recesses and / or protrusions.

2. The three-piece can according to claim 1, characterized in that, The two ends of the can body are round, and the middle part of the can body is square.

3. The three-piece can according to claim 2, characterized in that, The top cover and the body of the three-piece can are smoothly connected, and the bottom cover and the body of the three-piece can are rounded at the connection points.

4. The three-piece can according to any one of claims 1-3, characterized in that, The center of the bottom cover of the three-piece can is recessed into the interior of the three-piece can.

5. The three-piece can according to any one of claims 1-3, characterized in that, The top cover of the three-piece can is provided with several protruding structures that are recessed or protruding into the cavity.

6. The three-piece can according to claim 5, characterized in that, One side of the protruding structure has a tearable part.

7. The three-piece can according to any one of claims 1-3, characterized in that, The top of the three-piece can is also equipped with a dust cover.

8. The three-piece can according to claim 7, characterized in that, The dust cover has an array of threaded structures.

9. The three-piece can according to claim 7, characterized in that, The dust cover also has an opening mechanism.

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