A plastic packaging can

Abstract

The application discloses a plastic packaging can, which comprises a lower can body and an upper can body, the lower can body is composed of a base, a first ring connected to the base, and a second ring connected to the top of the first ring and coaxial with the first ring, the inner diameter of the outer ring of the first ring is larger than that of the second ring, the upper can body is composed of a top cover and a third ring connected to the lower surface of the top cover, the inner diameter of the outer ring of the third ring is equal to that of the first ring, and the inner diameter of the inner ring of the third ring is equal to that of the outer ring of the second ring, during installation, the third ring is slid downward along the outer ring of the second ring, and finally, the upper end of the first ring is installed in place by the third ring, and an elastic sealing piece is detachably sleeved at the gap between the first ring and the third ring. The application has the advantages of strong sealing performance and convenient opening and closing, the sliding assembly replaces the traditional thread, the difficult opening problem is solved, the double sealing design guarantees the storage safety, and the air guide assembly improves the installation smoothness.

Description

Technical Field

[0001] This utility model relates to the field of packaging can technology, and in particular to a plastic packaging can. Background Technology

[0002] Plastic packaging containers are widely used in food, daily chemical, industrial, and household industries due to their lightweight, impact resistance, ease of shaping, low cost, and adjustable sealing properties. Different plastic materials (PET / PP / HDPE / acrylic) can meet different needs such as food contact, corrosion resistance, and transparent display. They are lighter and more shockproof than glass jars, and less expensive and rust-free than metal jars, making them suitable for mass production and daily use. They can be made into round, square, and irregularly shaped containers, and equipped with screw caps, pull-ring caps, squeeze nozzles, etc., to suit different usage scenarios.

[0003] For example, Chinese utility model patent number 2020213099887 discloses a cylindrical food packaging can. The food packaging can has an outer can lid connecting part on its upper side, and an inner can lid connecting part on its upper side and inside the outer can lid connecting part. A can lid connecting cavity is formed between the outer can lid connecting part and the inner can lid connecting part. A sealing ring is formed on the lower side of the can lid connecting cavity. A sealing cover plate is formed on the upper side of the food packaging can corresponding to the inner can lid connecting part. The upper side of the food packaging can is connected to the can lid through the outer can lid connecting part and the inner can lid connecting part. A can body sealing ring is formed inside the can lid. An installation cavity is formed between the can lid and the can body sealing ring. This food packaging can allows for secondary sealing after the sealing cover plate is torn off. The sealing operation is simple and convenient, and the food can be resealed and preserved for a longer period of time.

[0004] The aforementioned plastic packaging cans use a common threaded connection structure with a sealing ring to achieve a seal. In daily use, it is often found that the top cover is difficult to unscrew. While the seal is good, it is inconvenient to open and close. There is an urgent need for a new type of plastic packaging can that balances sealing performance with ease of opening and closing. Summary of the Invention

[0005] This utility model aims to solve one of the technical problems existing in the prior art.

[0006] This application provides a plastic packaging can, characterized in that it includes a lower can body and an upper can body. The lower can body consists of a base, a first ring connected to the base, and a second ring connected to the top of the first ring and coaxial with it. The base, the first ring, and the second ring form a groove for storage. The inner diameter of the outer ring of the first ring is larger than the inner diameter of the outer ring of the second ring. The upper can body consists of a top cover and a third ring connected to the lower surface of the top cover. The inner diameter of the outer ring of the third ring is equal to the inner diameter of the outer ring of the first ring, and the inner diameter of the third ring is equal to the inner diameter of the outer ring of the second ring. During installation, the third ring slides tightly downward along the outer ring of the second ring and finally pushes against the top of the first ring to be installed in place. After installation, an elastic seal is detachably fitted at the gap between the first ring and the third ring.

[0007] Preferably, the inner ring of the third ring is provided with a gas guiding component for discharging gas outward during installation to facilitate installation.

[0008] Preferably, the air guiding assembly includes a plurality of air guiding grooves, which are sequentially opened on the inner ring of the third ring along the circumferential direction, and the air guiding grooves are arranged in the vertical direction.

[0009] Preferably, there are four air guide grooves, which are arranged at equal intervals along the circumference on the inner ring of the third ring.

[0010] Preferably, the outer rings of the first ring and the third ring are integrally formed with pointers for pointing to the current position. The two pointers are respectively located at opposite ends of the first ring and the third ring, and the lateral width of the two pointers gradually increases from the opposite end to the other end.

[0011] Preferably, the elastic seal is made of food-grade silicone or nitrile rubber, and is configured as a thin ring. Its vertical length is greater than the vertical length of the first ring or the third ring, and its vertical length is less than the combined vertical length of the first ring and the third ring. Under normal conditions, its inner diameter is smaller than the inner diameter of the second ring.

[0012] Preferably, the inner rings of the first ring and the second ring are connected in a flat manner.

[0013] Preferably, both the base and the top cover are flat discs, and the inner diameter of their outer rings is larger than the inner diameter of the outer rings of the first and third rings.

[0014] Preferably, the bottom surface of the base is provided with a lower circular groove, and the lower edge of the base is provided with at least one guide groove along the circumferential direction, so that when the base is placed on a plane, the guide groove can conduct air between the lower circular groove and the outside of the base.

[0015] Preferably, there are four guide grooves, which are arranged at equal intervals along the circumference on the lower edge of the base; the inner diameter of the lower circular groove is larger than the inner diameter of the outer ring of the top cover; and the upper surface of the top cover is provided with an upper circular groove.

[0016] Compared to existing technologies that use threaded rotation and unscrewing structures, this application of a plastic packaging can combines strong sealing with convenient opening and closing. A sliding assembly replaces the traditional thread, solving the problem of difficulty in unscrewing. It innovatively employs a dual-seal design of sliding tight fit + detachable elastic seals to ensure storage safety. A pointer structure enables visual display of the installation position. Both the lower and upper can bodies are manufactured using a one-piece injection molding process, eliminating complex connectors or precision parts, resulting in high production efficiency and controllable costs. Simultaneously, an air guide groove is designed to guide air during installation and ensure a tight seal after installation, reducing installation resistance compared to existing structures without air guide grooves. The use of detachable elastic seals reduces operating costs compared to one-piece sealing structures (the cost of replacing the seal separately is far lower than the cost of replacing the entire can), meeting the industry demand for low-cost, large-scale production of plastic packaging. It is widely applicable to storage scenarios in various fields such as food, daily chemicals, and industrial consumables.

[0017] The beneficial effects of this invention will be explained in detail in the embodiments, thereby making the beneficial effects more obvious. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the specific structure of an embodiment of this application.

[0019] Figure 2 This is an exploded view of a specific structure in an embodiment of this application.

[0020] Figure 3 This is a three-dimensional schematic diagram of the specific structure of the embodiment of this application without the elastic seal.

[0021] Figure 4 This is a bottom view of the specific structure of the upper tank in the embodiment of this application.

[0022] Figure 5 This is a top view schematic diagram of the specific structure of the lower tank in the embodiment of this application.

[0023] Figure 6 This is a bottom view of the specific structure of the lower tank in this embodiment of the application.

[0024] Figure 7 This is a three-dimensional schematic diagram of the specific structure of Embodiment 4 of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0028] Example 1: like Figures 1-6 As shown, a plastic packaging can, in a specific embodiment of this utility model, includes a lower can body and an upper can body. The lower can body consists of a base 1, a first ring 2 connected to the base 1, and a second ring 3 connected to the top of the first ring 2 and coaxial with it. The base 1, the first ring 2, and the second ring 3 form a storage groove. The inner diameter of the outer ring of the first ring 2 is larger than the inner diameter of the outer ring of the second ring 3. The upper can body consists of a top cover 4 and a third ring 5 connected to the lower surface of the top cover 4. The inner diameter of the outer ring of the third ring 5 is equal to the inner diameter of the outer ring of the first ring 2, and the inner diameter of the inner ring of the third ring 5 is equal to the inner diameter of the outer ring of the second ring 3. During installation, the third ring 5 slides tightly downward along the outer ring of the second ring 3 and finally pushes against the upper end of the first ring 2 to be installed in place. After installation, an elastic sealing element 6 is detachably fitted at the gap between the first ring 2 and the third ring 5.

[0029] The lower tank body (base 1 + first ring 2 + second ring 3) and the upper tank body (top cover 4 + third ring 5) adopt a tight sliding fit structure (the inner diameter of the outer ring of the third ring 5 = the inner diameter of the outer ring of the first ring 2, and the inner diameter of the inner ring = the inner diameter of the outer ring of the second ring 3). During installation, you only need to slide the third ring 5 down along the outer ring of the second ring 3 until it is tightly against the first ring 2. There is no need for the rotation operation of the traditional threaded can, which completely solves the problem that the better the seal of the existing products, the more difficult it is to unscrew. The opening and closing efficiency is greatly improved, and it is especially suitable for the elderly, children or people with weak hand strength. The sliding fit structure itself forms a radially tight primary seal, and then a secondary seal is formed by the detachable elastic seal 6 at the gap between the first ring 2 and the third ring 5. The double seal can effectively prevent air, moisture and dust from entering the can. After the elastic seal 6 is installed, the stability of the upper and lower installation connection is also improved. It is suitable for storing materials with high sealing requirements such as food and daily chemical products (such as nuts, dried goods and powder products), and extends the shelf life of the materials. At the same time, the elastic seal 6 is detachable and can be replaced separately after wear, extending the overall service life of the packaging can.

[0030] Example 2 The difference from Embodiment 1 is that, in addition to including the structural features of the aforementioned embodiments, in the specific embodiments of this utility model, such as... Figure 4 As shown, the inner ring of the third ring 5 is provided with a gas guiding component for venting gas outward during installation to facilitate installation.

[0031] In a specific embodiment of this utility model, the air guiding component includes a plurality of air guiding grooves 7, which are sequentially opened on the inner ring of the third ring 5 in the circumferential direction, and the air guiding grooves 7 are arranged in the vertical direction.

[0032] In a specific embodiment of this utility model, four air guide grooves 7 are provided, and the four air guide grooves 7 are arranged at equal intervals along the circumference on the inner ring of the third ring 5.

[0033] The third ring 5 has circumferentially spaced air guide slots 7 (preferably 4 slots) on its inner ring. This design allows for the real-time extraction of compressed air from the tank during installation, preventing the formation of a resistance barrier due to increased internal air pressure. This solves the problems of installation jamming and structural deformation caused by forced pressing when there is no air guide component. Installation resistance is reduced by at least half, and the potential for seal failure due to air pressure difference is avoided. Four air guide grooves 7 are arranged at equal intervals along the circumference on the inner ring of the third ring 5, allowing gas to be evenly discharged from the inside through the four air guide grooves 7 to the space between the first ring 2 and the third ring 5. This makes the sliding installation smoother and more stable. Furthermore, several air guide grooves 7 are arranged along the circumference on the inner ring of the third ring 5. During the sliding installation of the upper and lower tanks, air is guided. After installation, the first ring 2 and the third ring 5 will contact and compress each other, sealing several air guide grooves 7. The structure is cleverly designed. Then, a secondary seal is achieved by installing an elastic sealing element 6. The double seal effectively prevents air, moisture, and dust from entering the tank and improves the installation stability of both.

[0034] like Figure 4 As shown, the cross-section of the air guide groove 7 is trapezoidal, which reduces airflow resistance compared to a rectangular groove. The groove depth of the air guide groove 7 is less than or equal to half the thickness of the third ring 5, and the groove width gradually decreases from one end near the center of the third ring 5 to the other end.

[0035] Example 3 The difference from Embodiment 2 is that, in addition to including the structural features of the aforementioned embodiments, in this specific embodiment of the utility model, such as... Figures 1-3 As shown, the outer rings of the first ring 2 and the third ring 5 are integrally formed with pointers 8 for pointing to the current position. The two pointers 8 are respectively located at the ends of the first ring 2 and the third ring 5 that are far apart from each other, and the lateral width of the two pointers 8 gradually increases from the opposite end to the other end.

[0036] The gradient-width pointers 8, integrally formed on the outer rings of the first ring 2 and the third ring 5 (located at their opposite ends), serve as visual indicators of the installation positions of the upper and lower cans. When the two pointers 8 point in the same direction, the installation positions of the upper and lower cans can be determined, facilitating the correspondence of internal positions. This is suitable for situations where the placement of stored food needs to be clearly understood, and the user can choose the appropriate placement. Furthermore, the pointers 8 are wider at their opposite ends, allowing the wider portion to be exposed after the elastic seal 6 is installed, making identification easier. The width gradually increases from one end to the other, further enhancing recognizability.

[0037] In a specific embodiment of this utility model, the elastic sealing element 6 is made of food-grade silicone or nitrile rubber and is configured as a thin ring. Its vertical length is set to be greater than the vertical length of the first ring 2 or the third ring 5, and its vertical length is set to be less than the combined vertical length of the first ring 2 and the third ring 5. Under normal conditions, its inner diameter is set to be less than the inner diameter of the second ring 3.

[0038] like Figure 1 and Figure 2 As shown, the elastic seal 6 is a thin ring shape. Food-grade silicone is used for the elastic seal, suitable for food contact applications. For industrial consumable storage, nitrile rubber (oil-resistant) can be used. Its vertical length is set greater than that of the first ring 2 or the third ring 5. This structure ensures that when fitted between the first ring 2 and the third ring 5, it is less likely to shift out of its central position due to external forces, guaranteeing secondary sealing stability. It is also easier to fit into the first ring 2 and the third ring 5 (the outer diameters of the base 1 and the top cover 4 are larger). Furthermore, its vertical length is set less than the sum of the vertical lengths of the first ring 2 and the third ring 5 to avoid inconvenience caused by excessive length. Under normal conditions, its inner ring diameter is set smaller than that of the second ring 3 to ensure a good seal after deformation.

[0039] In a specific embodiment of this utility model, the inner rings of the first ring 2 and the second ring 3 are connected in a flat manner.

[0040] The inner rings of the first ring 2 and the second ring 3 are smoothly connected, so that there are no protrusions, steps or gaps inside the storage compartment, avoiding material (especially powder and granules) residue. Cleaning only requires simple wiping, which meets the hygiene requirements of food contact packaging.

[0041] Example 4: The difference from Embodiment 3 is that, in addition to including the structural features of the aforementioned embodiments, in this specific embodiment of the present invention, both the base 1 and the top cover 4 are flat discs and the inner diameter of their outer rings is larger than the inner diameter of the outer rings of the first ring 2 and the third ring 5.

[0042] The base 1 and the top cover 4 adopt a flat disc-shaped design with an outer ring inner diameter larger than the ring, which increases the contact area with the placement surface, making the can less likely to tip over when placed, and its stability is better than that of traditional cylindrical cans. In a specific embodiment of this utility model, the bottom surface of the base 1 is provided with a lower circular groove 9, and the lower edge of the base 1 is provided with at least one guide groove 10 along the circumferential direction, so that when the base 1 is placed on a plane, the guide groove 10 can conduct air between the lower circular groove 9 and the outside of the base 1.

[0043] In a specific embodiment of this utility model, four guide grooves 10 are provided in total, and the four guide grooves 10 are arranged at equal intervals along the circumference on the lower edge of the base 1; the inner diameter of the lower circular groove 9 is larger than the inner diameter of the outer ring of the top cover 4; the upper surface of the top cover 4 is provided with an upper circular groove 11.

[0044] like Figure 6-7 As shown, the lower circular groove 9 and the guide groove 10 (preferably 4 grooves) on the bottom surface of the base 1 allow air circulation between the lower circular groove 9 and the outside air through the guide groove 10, preventing the can from being difficult to pick up due to negative pressure adsorption when resetting the can. On the other hand, the inner diameter of the lower circular groove 9 is larger than the inner diameter of the outer ring of the top cover 4, so when the can is empty, the top cover 4 can be embedded into the lower circular groove 9 to achieve nested storage, reducing the storage space occupied. In some application scenarios, it can increase the position height of the base 1, the first ring 2 and the second ring 3 to form a storage slot.

[0045] The upper circular groove 11 on the upper surface of the top cover 4 can reduce the amount of material used, and on the other hand, when stacking, it makes it difficult for the upper surface of the top cover 4 to form a tight fit with the lower surface of the lower circular groove 9, thus avoiding the situation where it is difficult to fit and separate after long-term stacking.

[0046] Example 5: The difference from Embodiment 4 is that, in addition to including the structural features of the aforementioned embodiments, in this specific embodiment of the invention, the lower tank and the upper tank are integrally injection molded, such as... Figure 2 As shown, the entire plastic packaging can has a split structure consisting of three parts: an upper can body, a lower can body, and an elastic sealing element 6.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0048] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plastic packaging can, characterized in that, The device includes a lower tank and an upper tank. The lower tank consists of a base (1), a first ring (2) connected to the base (1), and a second ring (3) connected to the top of the first ring (2) and coaxial with it. The base (1), the first ring (2), and the second ring (3) form a storage groove. The outer inner diameter of the first ring (2) is larger than the outer inner diameter of the second ring (3). The upper tank consists of a top cover (4) and a third ring (5) connected to the lower surface of the top cover (4). The outer inner diameter of the third ring (5) is equal to the outer inner diameter of the first ring (2), and the inner inner diameter of the third ring (5) is equal to the outer inner diameter of the second ring (3). During installation, the third ring (5) slides tightly downward along the outer ring of the second ring (3) and finally pushes against the upper end of the first ring (2) to be installed in place. After installation, an elastic seal (6) is detachably fitted at the gap between the first ring (2) and the third ring (5).

2. A plastic packaging can according to claim 1, characterized in that, The inner ring of the third ring (5) is provided with a gas guiding component for venting gas outward during installation to facilitate installation.

3. A plastic packaging can according to claim 2, characterized in that, The air guiding assembly includes several air guiding grooves (7), which are sequentially opened on the inner ring of the third ring (5) in the circumferential direction, and the air guiding grooves (7) are arranged in the vertical direction.

4. A plastic packaging can according to claim 3, characterized in that, There are four air guide grooves (7), which are arranged at equal intervals along the circumference on the inner ring of the third ring (5).

5. A plastic packaging can according to claim 1, 2, 3, or 4, characterized in that, The outer rings of the first ring (2) and the third ring (5) are integrally formed with pointers (8) for pointing to the current position. The two pointers (8) are respectively located at the ends of the first ring (2) and the third ring (5) that are far apart from each other. The lateral width of the two pointers (8) gradually increases from the opposite end to the other end.

6. A plastic packaging can according to claim 1, 2, 3, or 4, characterized in that, The elastic seal (6) is made of food-grade silicone or nitrile rubber and is set in the shape of a thin ring. Its upper and lower lengths are set to be greater than the upper and lower lengths of the first ring (2) or the third ring (5) and less than the upper and lower lengths of the first ring (2) plus the third ring (5). Under normal conditions, its inner diameter is set to be less than the inner diameter of the second ring (3).

7. A plastic packaging can according to claim 1, 2, 3, or 4, characterized in that, The inner rings of the first ring (2) and the second ring (3) are connected smoothly.

8. A plastic packaging can according to claim 1, 2, 3, or 4, characterized in that, The base (1) and the top cover (4) are both flat discs, and the inner diameter of their outer rings is larger than the inner diameter of the outer rings of the first ring (2) and the third ring (5).

9. A plastic packaging can according to claim 8, characterized in that, The bottom surface of the base (1) is provided with a lower circular groove (9), and the lower edge of the base (1) is provided with at least one guide groove (10) along the circumferential direction, so that when the base (1) is placed on a plane, the guide groove (10) can conduct air between the lower circular groove (9) and the outside of the base (1).

10. A plastic packaging can according to claim 9, characterized in that, There are four guide grooves (10), and the four guide grooves (10) are arranged at equal intervals along the circumference on the lower edge of the base (1); the inner diameter of the lower circular groove (9) is larger than the inner diameter of the outer ring of the top cover (4); the upper surface of the top cover (4) is provided with an upper circular groove (11).

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