Double-sealing leakproof injection-molded cup cover structure
By employing a dual-sealing structure and one-piece injection molding technology, the problem of liquid leakage during the packaging of injection-molded cup lids has been solved, achieving efficient leak prevention and low-cost production.
Patent Information
- Application Number
- CN202610904080.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-23
- Publication Date
- 2026-07-24
AI Technical Summary
The single-point sealing structure of existing disposable injection-molded cup lids is prone to leakage due to deformation or burrs during takeout, resulting in spillage and affecting the consumer experience.
A dual-seal structure is designed, which includes an annular sealing protrusion and an outer ring wall forming a two-stage seal. The protrusion and groove structure of the vent and stacked parts are combined to achieve a stable connection. The structure is integrally formed by injection molding, which reduces production costs.
It effectively prevents liquid spillage, ensures reliable sealing, adapts to pressure changes in hot drinks, improves safety and ease of storage, and reduces production costs.
Smart Images
Figure CN122443822A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of injection molded cup production and processing, and in particular to a double-sealed leak-proof injection molded cup lid structure. Background Technology
[0002] With the rapid development of the beverage delivery market, the demand for disposable plastic cup lids is enormous. Currently, most disposable injection-molded cup lids on the market use a ring-shaped buckle on the inner side wall of the lid to fasten with the outer edge of the cup rim, relying on the tight contact of the fastening surfaces to achieve a single-point seal. However, in actual delivery processes, if the cup is deformed by pressure, subjected to bumps during riding, or if there are minor burrs on the outer edge of the cup rim, gaps can easily appear in the single-point seal, causing liquid to leak from the edge of the cup, resulting in spills, severely impacting the consumer experience and generating numerous customer complaints. Therefore, how to significantly improve the leak-proof reliability while maintaining the low cost, easy opening and closing, and stackability of disposable cup lids has become an urgent problem to be solved. Summary of the Invention
[0003] The purpose of this invention is to provide a double-sealed, leak-proof, disposable injection-molded cup cap to solve the problem of poor leak-proof reliability of existing single-sealed cup caps.
[0004] To achieve the above objectives, the present invention provides the following technical solution: A double-sealed leak-proof injection molded cup lid structure, wherein the cup lid structure is used to cover the cup body, and the cup lid structure includes a cup lid body and a double-sealing structure; The central area of the cup lid body is a straw insertion part, and the cup lid body is provided with several annular areas around the straw insertion part. The annular areas include air vents, stacking parts, and anti-slip parts. The vent section includes several pressure balance holes arranged in a circular array around the center of the cup lid. The vent section is used to prevent the water vapor generated by hot drinks or the carbon dioxide generated by sparkling water inside the cup body from increasing the internal air pressure after the cup lid structure covers the cup body, thereby damaging the connection structure between the cup lid structure and the cup body. The stacking part includes several boss structures on the surface of the cup lid body and recessed into the inside of the cup lid body. The boss structures are integrally formed with the cup lid body by injection molding. The upper part of the boss structure forms a groove structure. The boss structure and the groove structure are two sides of the same structure. The groove structure is used to insert the boss structure of the upper cup lid structure into the groove structure of the lower cup lid structure when several cup lid structures are stacked, connecting to form a stable whole. The anti-slip part includes several strip-shaped protrusions arranged in a circumferential array around the center of the cup lid. The anti-slip part is used to increase the friction between the hand and the cup lid when picking up the cup lid structure. The aforementioned double sealing structure includes an annular sealing protrusion located on the outer edge of the cup lid body. The annular sealing protrusion is engaged with the cup mouth of the cup body to form a first sealing structure. The annular sealing protrusion and the cup lid body are integrally formed by injection molding. An annular groove is formed on the upper part of the annular sealing protrusion. The annular sealing protrusion and the annular groove are two sides of the same structure. The annular groove is used to receive the contents of the cup body that overflow from the straw insertion part or the air outlet part. The double sealing structure also includes an outer ring wall extending downward from the edge of the cup lid body. The inner side of the outer ring wall is provided with an annular buckle for engaging with the annular outward flange at the mouth of the cup body. The annular buckle is provided with an outer sealing lip between the annular outward flange at the mouth of the cup body and the outer wall of the cup body. The cross-sectional shape of the outer sealing lip is arc-shaped. The arc-shaped cross-section abuts against the annular outward flange and the outer wall of the cup body to form a second sealing structure.
[0005] As a further improvement, the straw insertion part has a cross-groove structure or a round hole structure with a peelable circular cover connected to the round hole structure. The cross-groove structure, round hole, and circular cover are all integrally molded with the cup lid body using an injection molding process. The straw insertion part can be a cross-groove or a round hole structure with a peelable cover, improving usability and hygiene.
[0006] As a further improvement, the annular region surrounding the straw insertion part is divided into an air outlet, a stacking section, and an anti-slip section from the inside out. Clearly defining the order of the annular region from the inside out optimizes the liquid guidance and stacking logic.
[0007] As a further improvement, the top surface of the straw insertion part is higher than the top surface of the vent part, and the top surface of the stacked part is higher than the top surface of the straw insertion part. This creates a concave surface between the straw insertion part and the stacked part in the vent part, which is used to accommodate the contents of the cup that overflow from the straw insertion part or the vent part. Excess contents can also flow back into the cup from the straw insertion part. This height difference design accommodates overflowing liquid and guides its flow back, reducing waste and contamination.
[0008] As a further improvement, the top surface of the anti-slip part is higher than the bottom surface of the annular groove and lower than the top surface of the stacked part, forming a stepped structure. This allows excess contents overflowing from the straw insertion part or the vent to flow into the annular groove along the stepped structure. The anti-slip part and the stepped structure together form a liquid guiding channel, preventing contents from overflowing from the lid and contaminating the user's hands.
[0009] As a further improvement, the outer ring wall, the annular snap-fit portion, and the outer sealing lip are integrally formed with the cup lid and cup body through injection molding. This integral injection molding of the outer ring wall, annular snap-fit portion, and outer sealing lip reduces production costs and improves sealing reliability.
[0010] As a further improvement, the outer sealing lip can also be an annular sealing ring that is bonded or snapped together with the annular snap-fit portion. This results in better sealing performance.
[0011] As a further improvement, the diameter of the air pressure balance hole in the air outlet section is 1~2mm, and the number is not less than one. The air pressure balance hole is reasonably designed to ensure effective exhaust without affecting the seal.
[0012] As a further improvement, the stacking bosses are arranged in a ring with equal spacing, and the number is 2, 3, or 4. The number of stacking bosses is optional, ensuring that multiple cup lids are stacked stably and improving the convenience of storage and transportation.
[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) Double sealing to prevent leakage: The outer annular sealing protrusion and the lower outer ring wall form a two-stage sealing structure, which effectively prevents liquid from overflowing, and can be used safely even for hot drinks or carbonated beverages.
[0014] (2) Pressure relief design: The vent can release excess air pressure inside the cup, preventing the cup lid from being damaged due to excessive pressure.
[0015] (3) Stable stacking: The boss and groove structure of the stacking part achieves a stable connection when multiple cup lids are stacked, saving storage space.
[0016] (4) Anti-slip design: The anti-slip strip protrusions improve the grip friction, making it convenient and safe to use.
[0017] (5) Injection molding integration: The cup lid body and sealing structure are formed in one step through injection molding, which reduces production costs and improves manufacturing efficiency. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0019] Figure 1 This is a three-dimensional view from the outside of a double-sealed, leak-proof injection molded cup lid structure. Figure 2 This is a top view of a double-sealed, leak-proof injection molded cup lid structure; Figure 3 This is a three-dimensional view of the inner side of a double-sealed, leak-proof injection molded cup lid structure. Figure 4 This is a schematic diagram of a double-sealed structure; Figure 5This is a diagram illustrating the stacking of the cup lids; 1. Cup body; 11. Annular outward flange; 2. Straw insertion part; 3. Air outlet part; 31. Air pressure balance hole; 4. Stacking part; 41. Boss structure; 42. Groove structure; 5. Anti-slip part; 51. Strip-shaped protrusion; 6. Double sealing structure; 61. Annular sealing protrusion; 62. Annular groove; 63. Outer ring wall; 64. Annular buckle part; 65. Outer sealing lip. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Example 1 A double-sealed leak-proof injection molded cup lid structure, wherein the cup lid structure is used to cover the cup body 1, and the cup lid structure includes a cup lid body and a double-sealing structure. The central area of the cup lid body is the straw insertion part 2. The cup lid body is provided with several annular areas around the straw insertion part 2. The annular areas include air vents 3, stacking parts 4, and anti-slip parts 5. The vent 3 includes several pressure balance holes 31 arranged in a circular array around the center of the cup lid. The vent 3 is used to prevent the water vapor generated by hot drinks or the carbon dioxide generated by sparkling water inside the cup body 1 from increasing the internal air pressure of the cup body 1 after the cup lid structure covers the cup body 1, thereby damaging the connection structure between the cup lid structure and the cup body 1. The stacking part 4 includes several boss structures 41 provided on the surface of the cup lid body and recessed into the inside of the cup lid body. The boss structures 41 and the cup lid body are integrally formed by injection molding. The upper part of the boss structure 41 forms a groove structure 42. The boss structure 41 and the groove structure 42 are two sides of the same structure. The groove structure 42 is used to insert the boss structure 41 of the upper cup lid structure into the groove structure 42 of the lower cup lid structure when several cup lid structures are stacked, connecting to form a stable whole. The anti-slip part 5 includes several strip-shaped protrusions 51 arranged in a circular array around the center of the cup lid. The anti-slip part 5 is used to increase the friction between the hand and the cup lid when picking up the cup lid structure. The double sealing structure includes an annular sealing protrusion 61 located on the outer edge of the cup lid body. The annular sealing protrusion 61 is engaged with the cup mouth of the cup body 1 to form a first sealing structure. The annular sealing protrusion 61 and the cup lid body are integrally formed by injection molding. An annular groove 62 is formed on the upper part of the annular sealing protrusion 61. The annular sealing protrusion 61 and the annular groove 62 are two sides of the same structure. The annular groove 62 is used to receive the contents of the cup body 1 that overflow from the straw insertion part 2 or the air outlet part 3. The double sealing structure also includes an outer ring wall 63 extending downward from the edge of the cup lid body. The inner side of the outer ring wall 63 is provided with an annular buckle part 64 for engaging with the annular outer flange 11 at the mouth of the cup body 1. The annular buckle part 64 is provided with an outer sealing lip 65 between the annular outer flange 11 at the mouth of the cup body 1 and the outer wall of the cup body 1. The cross-sectional shape of the outer sealing lip 65 is arc-shaped. The arc-shaped cross-section abuts against the annular outer flange 11 and the outer wall of the cup body 1 to form a second sealing structure.
[0022] Example 2 Unlike Embodiment 1, the straw insertion part 2 has a cross-groove structure or a round hole structure with a peelable circular cover plate connected to the round hole structure. The cross-groove structure, round hole, and circular cover plate are all integrally formed with the cup lid body through injection molding. The cross-groove structure has a simple processing technology, while the mechanism of the round hole and circular cover plate improves the overall sealing performance.
[0023] Example 3 Unlike Embodiment 1, the annular region surrounding the straw insertion part 2 consists of, from the inside out, an air outlet part 3, a stacking part 4, and an anti-slip part 5.
[0024] The top surface of the straw insertion part 2 is higher than the top surface of the air outlet part 3, and the top surface of the stacking part 4 is higher than the top surface of the straw insertion part 2, so that the air outlet part 3 forms a concave surface between the straw insertion part 2 and the stacking part 4 to accommodate the contents of the cup body 1 that overflow from the straw insertion part 2 or the air outlet part 3, and excess contents can also flow back into the cup body 1 from the straw insertion part 2.
[0025] The top surface of the anti-slip part 5 is higher than the bottom surface of the annular groove 62 and lower than the top surface of the stacked part 4, forming a stepped structure, which allows excess contents overflowing from the straw insertion part 2 or the air outlet part 3 to flow into the annular groove 62 along the stepped structure.
[0026] The order of the annular area from the inside out is clearly defined, and the liquid guidance and stacking logic is optimized. The height difference design of the top surface can accommodate overflowing liquid and guide its return. The anti-slip part 5 is combined with the stepped structure to form a liquid guiding channel, reducing waste and preventing liquid from contaminating the user's hands.
[0027] Example 4 Unlike Embodiment 1, the outer ring wall 63, the annular snap fastener 64, and the outer sealing lip 65 are integrally formed with the cup lid and cup body 1 through injection molding. Integrating the outer ring wall 63, the annular snap fastener, and the outer sealing lip 65 into a single injection mold reduces production costs and improves sealing reliability.
[0028] The outer sealing lip 65 can also be an annular sealing ring that is bonded or snapped together with the annular snap-fit part 64. The outer sealing lip 65 can be in the form of an bonded or snap-fit sealing ring, resulting in a better sealing effect.
[0029] Example 5 Unlike Embodiment 1, the air pressure balance hole 31 of the air outlet portion 3 has a diameter of 1-2 mm and a quantity of not less than one. The air pressure balance hole 31 is reasonably sized to ensure effective exhaust without affecting the seal.
[0030] Example 6 Unlike Embodiment 1, the protrusion structures 41 of the stacking section 4 are distributed in a ring with equal spacing, and the number is 2, 3, or 4. The number of stacking protrusions is selected according to different situations. This ensures that multiple cup lids are stacked stably, improving the convenience of storage and transportation.
[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A double-sealed, leak-proof injection-molded cup lid structure, wherein the cup lid structure is used to cover the cup body, characterized in that, The cup lid structure includes a cup lid body and a double sealing structure; The central area of the cup lid body is a straw insertion part, and the cup lid body is provided with several annular areas around the straw insertion part. The annular areas include air vents, stacking parts, and anti-slip parts. The vent section includes several pressure balance holes arranged in a circular array around the center of the cup lid. The vent section is used to prevent the water vapor generated by hot drinks or the carbon dioxide generated by sparkling water inside the cup body from increasing the internal air pressure after the cup lid structure covers the cup body, thereby damaging the connection structure between the cup lid structure and the cup body. The stacking part includes several boss structures on the surface of the cup lid body and recessed into the inside of the cup lid body. The boss structures are integrally formed with the cup lid body by injection molding. The upper part of the boss structure forms a groove structure. The boss structure and the groove structure are two sides of the same structure. The groove structure is used to insert the boss structure of the upper cup lid structure into the groove structure of the lower cup lid structure when several cup lid structures are stacked, connecting to form a stable whole. The anti-slip part includes several strip-shaped protrusions arranged in a circumferential array around the center of the cup lid. The anti-slip part is used to increase the friction between the hand and the cup lid when picking up the cup lid structure. The aforementioned double sealing structure includes an annular sealing protrusion located on the outer edge of the cup lid body. The annular sealing protrusion is engaged with the cup mouth of the cup body to form a first sealing structure. The annular sealing protrusion and the cup lid body are integrally formed by injection molding. An annular groove is formed on the upper part of the annular sealing protrusion. The annular sealing protrusion and the annular groove are two sides of the same structure. The annular groove is used to receive the contents of the cup body that overflow from the straw insertion part or the air outlet part. The double sealing structure also includes an outer ring wall extending downward from the edge of the cup lid body. The inner side of the outer ring wall is provided with an annular buckle for engaging with the annular outward flange at the mouth of the cup body. The annular buckle is provided with an outer sealing lip between the annular outward flange at the mouth of the cup body and the outer wall of the cup body. The cross-sectional shape of the outer sealing lip is arc-shaped. The arc-shaped cross-section abuts against the annular outward flange and the outer wall of the cup body to form a second sealing structure.
2. The double-sealed leak-proof injection molded cup lid structure according to claim 1, characterized in that, The straw insertion part has a cross groove structure or a round hole structure and a peelable round cover plate connected to the round hole structure. The cross groove structure, round hole and round cover plate are all integrally formed with the cup lid body by injection molding process.
3. The double-sealed leak-proof injection molded cup lid structure according to claim 1, characterized in that, The annular area surrounding the straw insertion part consists of, from the inside out, an air outlet, a stacking part, and an anti-slip part.
4. The double-sealed leak-proof injection molded cup lid structure according to claim 3, characterized in that, The top surface of the straw insertion part is higher than the top surface of the air outlet part, and the top surface of the stacked part is higher than the top surface of the straw insertion part, so that the air outlet part forms a concave surface between the straw insertion part and the stacked part to accommodate the contents of the cup that overflow from the straw insertion part or the air outlet part, and excess contents can also flow back into the cup from the straw insertion part.
5. A double-sealed leak-proof injection molded cup lid structure according to claim 3 or 4, characterized in that, The top surface of the anti-slip part is higher than the bottom surface of the annular groove and lower than the top surface of the stacked part, forming a stepped structure, which allows excess contents overflowing from the straw insertion part or the air outlet part to flow into the annular groove along the stepped structure.
6. The double-sealed leak-proof injection molded cup lid structure according to claim 1, characterized in that, The outer ring wall, the annular buckle part, and the outer sealing lip are integrally formed with the cup lid and cup body through injection molding.
7. The double-sealed leak-proof injection molded cup lid structure according to claim 6, characterized in that, The outer sealing lip can also be an annular sealing ring that is bonded or snapped together with the annular snap-fit part.
8. The double-sealed leak-proof injection molded cup lid structure according to claim 1, characterized in that, The air pressure balance hole of the air outlet has a diameter of 1~2mm and the number is not less than one.
9. The double-sealed leak-proof injection molded cup lid structure according to claim 1, characterized in that, The stacked part has bosses arranged in an equally spaced ring pattern, with a quantity of 2, 3, or 4.