High-sealing cosmetics container

By fixing the seal on the middle ring in the cosmetic container, utilizing the interference fit between the inner cover and the middle ring and the airtight fit between the middle ring and the base, the problem of the seal ring falling off is solved, and a cosmetic container design with high sealing performance and long life is achieved.

WO2025214058A1PCT designated stage Publication Date: 2025-10-16SHYA HSIN PACKAGING INDUSTRY (CHINA) CO LTD
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Patent Information

Application Number
PCT/CN2025/082262
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-09
Filing Date
2025-03-13
Publication Date
2025-10-16

AI Technical Summary

Technical Problem

The sealing rings of existing cosmetic containers are easy to fall off, resulting in reduced sealing performance, shortening the service life and causing waste of resources.

Method used

The seal is fixed on the middle ring, and the interference fit between the inner cover and the middle ring and the airtight fit between the middle ring and the base are utilized to achieve double sealing between the inner cover and the middle ring and the base, thereby simplifying the sealing structure.

Benefits of technology

The sealing effect of cosmetic containers is improved, the service life is extended, and resource waste is reduced.

✦ Generated by Eureka AI based on patent content.

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    Figure CN2025082262_16102025_PF_FP_ABST
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Abstract

A high-sealing cosmetics container, comprising an inner lid (20), a middle ring (30), a sealing member (40) and a base (50), wherein the middle ring (30) is fixedly mounted in the base (50); the sealing member (40) is fixedly arranged on the middle ring (30); the base (50) is configured to store a cosmetics material; and the sealing member (40) comprises a first sealing portion (41) and a second sealing portion (42), the inner lid (20) being in interference fit with the first sealing portion (41) so as to make the inner lid (20) cover on the middle ring (30) in an airtight manner, and the middle ring (30) being in airtight fit with the base (50) by means of the second sealing portion (42). By means of fixing the sealing member (40) to the middle ring (30), the phenomenon of the sealing member (40) being separated from the inner lid (20) is avoided, such that the sealing effect of products is improved and thus the service life of the products is prolonged.
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Description

High sealing cosmetic container TECHNICAL FIELD

[0001] The present application relates to the cosmetic packaging technology field, and particularly relates to a high sealing cosmetic container. BACKGROUND

[0002] The existing cosmetic container comprises an inner container assembly and a shell assembly, the inner container assembly comprises an inner cover, a middle ring and a powder disc, the shell assembly comprises an outer cover, an outer bottom and an inner bottom, the inner bottom is installed in the outer bottom, the inner container assembly is installed in the inner bottom, and the outer cover covers the inner container assembly. The inner cover and the middle ring are sealed by a sealing ring, the sealing ring is formed on the outer side wall of the inner cover, and in use, the sealing ring is easy to fall off from the inner cover due to repeated opening and closing of the inner cover, thereby affecting the sealing performance of the cosmetic container and causing waste of resources. SUMMARY

[0003] In order to overcome the above-mentioned defects, the present application provides a high sealing cosmetic container, wherein the sealing member is fixed on the middle ring, so that the sealing ring is not separated from the inner cover, thereby improving the sealing effect of the product and prolonging the service life of the product.

[0004] The technical scheme adopted by the present application to solve the technical problems is as follows:

[0005] A high sealing cosmetic container comprises an inner cover, a middle ring, a sealing member and a base, the middle ring is fixedly installed in the base, the sealing member is fixedly arranged on the middle ring, the base is used for storing cosmetic materials, the sealing member comprises a first sealing part and a second sealing part, the inner cover is in interference fit with the first sealing part, so that the inner cover is tightly covered on the middle ring, and the middle ring is in tight fit with the base through the second sealing part.

[0006] Optionally, the inner side wall of the first sealing part extends radially inward to form an annular rib, the outer side wall of the inner cover is inwardly recessed to form an annular groove, and the annular rib is in interference fit in the annular groove.

[0007] Optionally, the middle ring and the sealing member are integrally formed by two-color injection molding.

[0008] Optionally, a gate is arranged on the middle ring, the sealing member is formed on the middle ring through the gate, and the first sealing part and the second sealing part are respectively formed on two sides of the gate.

[0009] Optionally, the middle ring comprises a first connecting part, a supporting ring and a second connecting part, the supporting ring is arranged on the inner wall of the middle ring in the circumferential direction, the first connecting part and the second connecting part are respectively arranged on the upper side and the lower side of the supporting ring, the first sealing part is formed on the inner side wall of the first connecting part, and the second sealing part is formed on the inner side wall of the second connecting part.

[0010] Optionally, the inner cover, the middle ring and the base are made of hard plastic, and the sealing member is made of elastic material, the hardness of the hard plastic is greater than the hardness of the elastic material.

[0011] Optionally, the hard plastic comprises PET material, and the elastic material comprises TPE material.

[0012] Optionally, the base comprises a material loading disc and an outer bottom, the outer bottom is arranged on the outer side of the material loading disc, the middle ring is fixed between the material loading disc and the outer bottom, and the material loading disc and the outer bottom are integrally formed; or, the material loading disc and the outer bottom are in a split structure.

[0013] Optionally, the base is fixedly provided with an elastic sheet, the elastic sheet is provided with a first buckle, the elastic sheet is arranged between the material loading disc and the outer bottom, and the outer side wall of the middle ring is provided with a second buckle which is matched with the first buckle.

[0014] Optionally, the application further comprises an outer cover, the outer cover covers the inner cover, the outer cover is hingedly connected to the base through a first hinge assembly, the outer cover and the base are fixedly connected through a clamping assembly, and the inner cover is hingedly connected to the middle ring through a second hinge assembly.

[0015] The application has the following beneficial effects: in the application, the first sealing part of the sealing member is used to seal the inner cover and the middle ring, and the second sealing part of the sealing member is used to seal the middle ring and the base, so that the structure of the sealing member is simplified, and the sealing effect of the cosmetic container is improved; since the sealing member is fixed on the middle ring, the sealing member does not need to move with the inner cover during the opening and closing of the inner cover, compared with the structure in which the sealing member is fixed on the inner cover, the application will not cause the sealing member to be separated from the inner cover, thereby prolonging the service life of the product and reducing the waste of resources. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a front view of the cosmetic container in the application;

[0017] Fig. 2 is a top view of the cosmetic container in the application;

[0018] Fig. 3 is a sectional view along A-A in Fig. 2;

[0019] Fig. 4 is an enlarged view of D in Fig. 3;

[0020] Fig. 5 is a sectional view along B-B in Fig. 2;

[0021] Fig. 6 is a sectional view along C-C in Fig. 2;

[0022] Fig. 7 is an exploded view of the cosmetic container in the present application;

[0023] Fig. 8 is another exploded view of the cosmetic container in the present application;

[0024] Fig. 9 is a structural schematic view of the outer cover in the present application;

[0025] Fig. 10 is a structural schematic view of the inner cover in the present application;

[0026] Fig. 11 is another structural schematic view of the inner cover in the present application;

[0027] Fig. 12 is a structural schematic view of the middle ring in the present application;

[0028] Fig. 13 is another structural schematic view of the middle ring in the present application;

[0029] Fig. 14 is a structural schematic view of the sealing member in the present application;

[0030] Fig. 15 is a structural schematic view of the middle ring and the sealing member in the present application;

[0031] Fig. 16 is a structural schematic view of the base in the present application;

[0032] In the figures: 10 - outer cover, 11 - first hinge, 12 - clamping slot, 13 - mirror, 14 - top sheet,

[0033] 20 - inner cover, 21 - second hinge, 22 - convex edge, 23 - annular groove,

[0034] 30 - middle ring, 31 - gate, 32 - first joint, 33 - support ring, 34 - second joint, 35 - second clasp, 36 - third hinge, 37 - second hinge shaft, 38 - mesh cloth,

[0035] 40 - sealing member, 41 - first sealing part, 42 - second sealing part, 43 - annular convex rib, 44 - groove,

[0036] 50 - base, 51 - loading disc, 52 - outer bottom, 53 - spring sheet, 54 - first clasp, 55 - clamping jaw, 56 - hinge hole, 57 - first hinge shaft. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the embodiments described in the present application are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the following drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the objects thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0039] For ease of description, spatial relative terms such as "over", "above", "upper surface", "upper", and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices as described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0040] Embodiment: As shown in FIGS. 1-16, a high-sealing cosmetic container includes an inner cover 20, a middle ring 30, a sealing member 40, and a base 50. The middle ring 30 is fixedly installed in the base 50, and the sealing member 40 is fixedly arranged on the middle ring 30. The base 50 is used to store cosmetic materials. The sealing member 40 includes a first sealing part 41 and a second sealing part 42. The inner cover 20 is in interference fit with the first sealing part 41, so that the inner cover 20 is hermetically covered on the middle ring 30. The middle ring 30 and the base 50 are hermetically fit through the second sealing part 42.

[0041] In the present application, as shown in Fig. 3, the middle ring 30 is installed in the base 50, the base 50 stores the cosmetic material, the inner cover 20 covers the middle ring 30, the sealing member 40 is fixed on the middle ring 30, the first sealing part 41 of the sealing member 40 is interference fitted on the inner cover 20, and the second sealing part 42 of the sealing member 40 is interference fitted on the base 50. Optionally, the mesh cloth 38 is welded on the middle ring 30, and the base 50 and the inner cover 20 are located on two sides of the mesh cloth 38. Optionally, the inner cover 20 stores the cosmetic tool such as the powder puff, the cosmetic brush or the cosmetic cotton head, and the user dips the cosmetic material through the cosmetic tool to complete the cosmetic process. The inner cover 20 is airtightly covered on the middle ring 30 by the first sealing part 41 to seal the base 50, thereby effectively preventing the external air from entering the base 50 from the inner cover 20, avoiding the pollution and deterioration of the cosmetic material, and prolonging the service life of the cosmetic material; the middle ring 30 is airtightly combined with the base 50 by the second sealing part 42 to prevent the air from entering the base 50 from the gap between the middle ring 30 and the base 50, further improving the sealing performance of the cosmetic container, and also preventing the leakage of the cosmetic material in the base 50.

[0042] In the present application, the first sealing part 41 on the sealing member 40 is used to seal the inner cover 20 and the middle ring 30, and the second sealing part 42 on the sealing member 40 is used to seal the middle ring 30 and the base 50, thereby simplifying the structure of the sealing member 40 and improving the sealing effect of the cosmetic container; since the sealing member 40 is fixed on the middle ring 30, the sealing member 40 does not need to move with the inner cover 20 during the opening and closing process of the inner cover 20, compared with the structure that the sealing member 40 is fixed on the inner cover 20, the present application does not occur the situation that the sealing member 40 is separated from the inner cover 20, thereby prolonging the service life of the product and reducing the waste of resources.

[0043] As shown in Fig. 4, Fig. 11 and Fig. 14, the inner side wall of the first sealing part 41 extends radially inward to form the annular rib 43, the outer side wall of the inner cover 20 is inwardly recessed to form the annular groove 23, and the annular rib 43 is interference fitted in the annular groove 23. The mutual cooperation of the annular rib 43 and the annular groove 23 can further improve the airtight effect between the first sealing part 41 and the inner cover 20.

[0044] Optionally, the middle ring 30 and the sealing member 40 are integrally formed by two-color injection molding. The middle ring 30 and the sealing member 40 are integrally formed by the two-color mold injection molding process, and the combination strength and the sealing effect are high.

[0045] As shown in FIG. 12 and FIG. 13, the middle ring 30 is provided with a gate 31, the sealing member 40 is formed on the middle ring 30 through the gate 31, and the first sealing part 41 and the second sealing part 42 are formed on both sides of the gate 31 respectively. In production, the middle ring 30 is initially formed, and then the molten sealing member raw material is poured on the middle ring 30 through the gate 31, so that the molten material flows from the upper layer of the middle ring 30 to the lower layer of the middle ring 30 through the gate 31, thereby forming the first sealing part 41 and the second sealing part 42, and the first sealing part 41 and the second sealing part 42 are fixedly connected at the gate 31. As shown in FIG. 14, the sealing member 40 after forming is provided with a groove 44. In the present application, the gate 31 is provided on the middle ring 30 to facilitate the processing and forming of the sealing member 40. When the inner cover 20 is closed, the lower bottom surface of the inner cover 20 extrudes the first sealing part 41, so that the first sealing part 41 deforms to achieve the effect of air tightness, and the second sealing part 42 is in interference fit with the base 50 to achieve air tightness with the base 50.

[0046] As shown in FIG. 12 and FIG. 13, the middle ring 30 includes a first connecting part 32, a supporting ring 33 and a second connecting part 34, the supporting ring 33 is arranged on the inner wall of the middle ring 30 in the circumferential direction, and the first connecting part 32 and the second connecting part 34 are respectively located on the upper and lower sides of the supporting ring 33. As shown in FIG. 4, the first sealing part 41 is formed on the inner side wall of the first connecting part 32, and the second sealing part 42 is formed on the inner side wall of the second connecting part 34. The gate 31 is arranged on the supporting ring 33, the area corresponding to the supporting ring 33 of the sealing member 40 forms the groove 44, and the area corresponding to the gate 31 of the sealing member 40 forms a connecting part to fixedly connect the first sealing part 41 and the second sealing part 42.

[0047] Optionally, the inner cover 20, the middle ring 30 and the base 50 are made of hard plastic, and the sealing member 40 is made of elastic material, and the hardness of the hard plastic is greater than the hardness of the elastic material. The elastic material includes thermoplastic elastomer and various special saturated rubber that cannot be vulcanized by sulfur, and the thermoplastic elastomer includes thermoplastic polyurethane elastomer rubber TPU, thermoplastic polyester elastomer TPEE, styrene-butadiene-styrene block copolymer SBS, etc. The sealing member 40 is made of elastic material, so that when the inner cover 20 is closed on the middle ring 30, the first sealing part 41 deforms to facilitate interference fit between the inner cover 20 and the middle ring 30 to achieve air tightness; when the middle ring 30 is installed on the base 50, the second sealing part 42 is in interference fit with the base 50 to achieve air tightness between the middle ring 30 and the base 50, and the cosmetic material will not leak out. The middle ring 30 and the sealing member 40 are made of plastic with different hardness, and the hardness of the sealing member 40 is less than the hardness of the middle ring 30, so as to improve the sealing effect of the sealing member 40.

[0048] The hard plastic includes PET material, and the elastic material includes TPE material. PET (PolyEthylene Terephthalate) is polyethylene terephthalate, and PET is a plastic with excellent strength and rigidity, good transparency and high temperature resistance, and is suitable for making high-strength, transparent and high-temperature-resistant containers. The TPE material is a thermoplastic elastomer material, and the TPE has good elasticity. In the present application, the inner cover 20, the middle ring 30 and the base 50 are made of PET material, so that the product has the properties of high strength, high hardness and high transparency, and the quality and grade of the product are improved. In order to solve the problem of poor sealing performance between the high-hardness inner cover 20 and the middle ring 30, and between the middle ring 30 and the base 50, a sealing element 40 is arranged between the inner cover 20 and the middle ring 30, and between the base 50 and the middle ring 30, and the sealing element 40 is made of TPE material with good elasticity, so that the cosmetic container with high strength, high hardness, high transparency and high sealing performance is obtained.

[0049] In one possible embodiment, as shown in FIG. 16, the base 50 includes a material loading tray 51 and an outer bottom 52, the outer bottom 52 is located outside the material loading tray 51, and the middle ring 30 is fixed between the material loading tray 51 and the outer bottom 52. The material loading tray 51 is used to store cosmetic materials, and the cosmetic materials include powdery, pasty and paste materials. The material loading tray 51 and the outer bottom 52 are integrally formed; that is, the base 50 is an integrally formed part, so as to further reduce the components of the cosmetic container and simplify the production and assembly process of the product. After the base 50 is formed, the middle ring 30 is fixedly sleeved on the material loading tray 51.

[0050] In another possible embodiment, the material loading tray 51 and the outer bottom 52 are in a split structure. In the present embodiment, the outer bottom 52 and the material loading tray 51 are independently formed respectively, and then the material loading tray 51 is fixedly installed in the middle ring 30, and the middle ring 30 is detachably installed in the outer bottom 52.

[0051] When the materials in the material loading tray 51 are used up, the material loading tray 51, the inner cover 20 and the middle ring 30 are disassembled, and new material loading tray 51, inner cover 20 and middle ring 30 are replaced for continuous use, so that other components of the cosmetic container can be reused, which is energy-saving, environment-friendly and cost-saving. When assembling, the material loading tray 51 is installed in the middle ring 30 first, and then the materials are filled into the material loading tray 51. After filling, the middle ring 30 is installed in the outer bottom 52. In the process of filling the materials, if an adverse effect is caused due to misoperation, only the material loading tray 51 needs to be disassembled alone, and a new material loading tray 51 is replaced.

[0052] As shown in FIG. 6 and FIG. 16, the base 50 is fixedly provided with a spring sheet 53, the spring sheet 53 is provided with a first buckle 54, the spring sheet 53 is located between the material loading disc 51 and the outer bottom 52, and the outer side wall of the middle ring 30 is provided with a second buckle 35 which is buckled with the first buckle 54. The second buckle 35 is located on the outer side wall of the second joint part 34, that is, the base 50 and the middle ring 30 are fixedly connected through the buckling of the first buckle 54 and the second buckle 35.

[0053] As shown in FIG. 1-8, the cosmetic container further comprises an outer cover 10 which is buckled with the inner cover 20, the outer cover 10 is rotatably connected with the base 50 through a first hinge assembly, and the outer cover 10 and the base 50 are fixedly connected through a buckling assembly, and the inner cover 20 is rotatably connected with the middle ring 30 through a second hinge assembly. The top surface of the outer cover 10 is fixedly attached with a top sheet 14 which is made of plastic material. Optionally, the outer cover 10 and the inner cover 20 are made of the same material. The inner side of the outer cover 10 is attached with a mirror 13. The top sheet 14 has a similar appearance and touch of leather, and is attached to the outer surface of the cosmetic container, which not only protects the container, but also gives a visual sense of leather and improves the product grade. The top sheet 14 is made of plastic material, which is more wear-resistant and elastic than leather. Compared with the traditional products which are made of silicone substrate combined with leather surface by stamping, the top sheet 14 has high hardness and strong toughness, and is more durable. Optionally, the top sheet 14 is provided with a mark which is a letter, a number, a Chinese character or other special symbol, and the mark is integrally injection molded with the top sheet 14. Optionally, the top sheet 14 comprises a TPU material sheet, a PP material sheet, a PVC material sheet or a PET material sheet. Wherein, TPU (ThermoPlastic polyUrethane) is a thermoplastic polyurethane elastomer rubber, PET (PolyEthylene Terephthalate) is polyethylene terephthalate, PP (PolyPropylene) is polypropylene, and PVC (PolyVinyl Chloride) is polyvinyl chloride.

[0054] The first hinge assembly comprises a first hinge 11, a hinge hole 56 and a first hinge shaft 57. As shown in FIG. 9, the outer cover 10 is fixedly provided with the first hinge 11. As shown in FIG. 16, the outer bottom 52 is provided with the hinge hole 56. As shown in FIG. 3, the first hinge shaft 57 is arranged through the first hinge 11 and the hinge hole 56 to rotatably connect the outer cover 11 with the outer bottom 52.

[0055] The second hinge assembly comprises a second hinge 21, a third hinge 36 and a second hinge shaft 37. The second hinge 21 is fixed on the inner cover 20 as shown in Figs. 10 and 11, the third hinge 36 is fixed on the middle ring 30 as shown in Fig. 5, and the second hinge shaft 37 is arranged through the second hinge 21 and the third hinge 36 to rotatably connect the inner cover 20 to the middle ring 30. As shown in Figs. 10 and 11, the inner cover 20 extends radially outward to form a protruding edge 22, which facilitates opening of the inner cover 20.

[0056] The clamping assembly comprises a clamping slot 12 and a clamping claw 55. The clamping slot 12 is formed on the outer cover 10 as shown in Fig. 9, and the clamping claw 55 is arranged on the outer bottom 52 as shown in Fig. 3. The clamping claw 55 is buckled in the clamping slot 12 to clampingly fix the outer cover 10 and the outer bottom 52.

[0057] It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A highly sealed cosmetic container, characterized by: The cosmetic product comprises an inner cover (20), a middle ring (30), a sealing member (40) and a base (50), wherein the middle ring (30) is fixedly installed in the base (50), the sealing member (40) is fixedly arranged on the middle ring (30), the base (50) is used for storing cosmetic materials, the sealing member (40) comprises a first sealing portion (41) and a second sealing portion (42), the inner cover (20) and the first sealing portion (41) are interference-fitted so that the inner cover (20) is airtightly covered on the middle ring (30), and the middle ring (30) and the base (50) are airtightly fitted through the second sealing portion (42).

2. The highly airtight cosmetic container according to claim 1, characterized in that: The inner side wall of the first sealing portion (41) extends radially inward to form an annular rib (43), and the outer side wall of the inner cover (20) is recessed inward to form an annular groove (23), and the annular rib (43) is interference-fitted into the annular groove (23).

3. The highly airtight cosmetic container according to claim 1, characterized in that: The middle ring (30) and the sealing member (40) are integrally formed by two-color injection molding.

4. The highly airtight cosmetic container according to claim 3, characterized in that: The middle ring (30) is provided with a gate (31), and the sealing member (40) is formed on the middle ring (30) through the gate (31), and the first sealing portion (41) and the second sealing portion (42) are respectively formed on both sides of the gate (31).

5. The highly airtight cosmetic container according to claim 4, characterized in that: The middle ring (30) includes a first joint portion (32), a support ring (33) and a second joint portion (34); the support ring (33) is circumferentially arranged on the inner wall of the middle ring (30); the first joint portion (32) and the second joint portion (34) are respectively located on the upper and lower sides of the support ring (33); the first sealing portion (41) is formed on the inner side wall of the first joint portion (32); and the second sealing portion (42) is formed on the inner side wall of the second joint portion (34).

6. The highly airtight cosmetic container according to claim 1, characterized in that: The inner cover (20), the middle ring (30) and the base (50) are made of hard plastic, and the sealing member (40) is made of elastic material. The hardness of the hard plastic is greater than that of the elastic material.

7. The highly airtight cosmetic container according to claim 6, characterized in that: The hard plastic includes PET material, and the elastic material includes TPE material.

8. The highly airtight cosmetic container according to claim 1, characterized in that: The base (50) comprises a loading tray (51) and an outer bottom (52), wherein the outer bottom (52) is located outside the loading tray (51), and the middle ring (30) is fixed between the loading tray (51) and the outer bottom (52), and the loading tray (51) and the outer bottom (52) are integrally formed; or, the loading tray (51) and the outer bottom (52) are separate structures.

9. The highly airtight cosmetic container according to claim 8, characterized in that: A spring piece (53) is fixedly provided on the base (50), a first buckle (54) is provided on the spring piece (53), the spring piece (53) is located between the loading tray (51) and the outer bottom (52), and a second buckle (35) is provided on the outer side wall of the middle ring (30) for engaging with the first buckle (54).

10. The highly airtight cosmetic container according to any one of claims 1 to 9, characterized in that: The invention also includes an outer cover (10), wherein the outer cover (10) covers the inner cover (20), the outer cover (10) is hinged to the base (50) via a first hinge assembly, and the outer cover (10) and the base (50) are fixed by a snap assembly, and the inner cover (20) is hinged to the middle ring (30) via a second hinge assembly.

Citation Information

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