A bottle cap and bottle capable of being heated for sterilization
By setting an anti-rust layer and a passivation layer on the metal bottle cap and injection molding the sealing layer, the problems of high cost of sealing layer bonding and easy rusting at the cut are solved in the existing technology, achieving a lower cost and higher quality sealing effect, which is suitable for high temperature sterilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG ZIQUAN PACKAGING
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-29
AI Technical Summary
Existing metal bottle caps have high sealing layer bonding costs and are difficult to control in terms of quality. The anti-rust layer at the cut is thin and prone to rusting, and additional bonding layers are required, which increases costs.
A double-layer protection system is used, consisting of a rust-preventive layer and a passivation layer on a metal base. The sealing layer is injection molded into the inside of the bottle cap to avoid additional adhesive layers. A passivation layer is also provided at the cut edges to improve rust resistance.
It achieves a lower cost and higher quality sealing effect, the sealing layer is firmly bonded to the bottle cap, the cut area is not easy to rust, and it is suitable for high-temperature sterilization.
Smart Images
Figure CN224297822U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bottle cap technology, and in particular to a bottle cap and bottle that can be heated and sterilized. Background Technology
[0002] The bottle cap is placed on the bottle, and the internal sealing ring presses against the bottle opening to prevent the liquid inside from spilling. Some bottle caps on the market are made of metal, so rust prevention measures are necessary. Some bottle caps use adhesive to attach the internal sealing layer to the inside of the cap; this design requires an additional adhesive layer, which is costly and the adhesion quality is difficult to control. Furthermore, after metal bottle caps are cut, the rust-proof layer at the cut edges is relatively thin, making these areas prone to rusting.
[0003] For example, Chinese patent application number CN201520036924.7 discloses a coated iron bottle cap and its manufacturing equipment; specifically, it discloses that "a sealing layer is attached to the lower surface of an iron substrate. The sealing layer is made of PET or PE material. The sealing layer includes a gasket and a second adhesive layer located between the gasket and the iron substrate. The gasket is attached to the underside of the iron substrate through the second adhesive layer." It is evident that the sealing layer of this type of coated iron bottle cap is set inside the cap using a heat-bonding method, requiring an additional adhesive layer, resulting in high cost and difficulty in controlling the bonding quality. Furthermore, the anti-rust layer (tin-plated or chrome-plated) at the cut edge of the cap is relatively thin and prone to rusting. Utility Model Content
[0004] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide a heatable sterilization device with a sealing layer injection molded inside the bottle cap, resulting in lower cost and better quality control; the cut position of the bottle cap has a passivation layer for better rust prevention; thereby overcoming the shortcomings of the existing technology.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This application provides a heatable sterilizable bottle cap, comprising a metal base layer, a rust-proof layer plated on the metal base layer, a passivation layer disposed on the rust-proof layer, a base layer disposed on the passivation layer, a printing layer disposed on the base layer, and a protective layer disposed on the printing layer; a sealing layer is injection molded inside the bottle cap.
[0007] Preferably, the bottle cap body is formed by stamping a metal base layer. The bottle cap body includes a cap top and a cap body. The inner wall of the cap body is formed with a first thread and a limiting flange, and the limiting flange supports the edge of the sealing layer.
[0008] Preferably, the top of the cover is provided with a groove, and the top surface of the sealing layer is embedded in the groove.
[0009] Preferably, the bottom of the cover is provided with an anti-theft ring, and a tear line is provided between the anti-theft ring and the cover.
[0010] Preferably, the metal base layer is iron; the rust-proof layer is a chromium-plated layer or a tin-plated layer; and the thickness of the bottle cap is between 0.1mm-0.16mm or 0.26-0.40mm.
[0011] Preferably, the underlayer and protective layer are one of polyimide, polyethylene terephthalate, high-temperature resistant silicone, polyphenylene sulfone resin, high-temperature resistant resin, polyethylene, and polypropylene.
[0012] Preferably, the printed layer is a patterned plastic film or a UV ink layer.
[0013] Preferably, the sealing layer is one of polypropylene, polyethylene, polyethylene terephthalate, and polystyrene.
[0014] Preferably, the bottom of the sealing layer is provided with a sealing groove, which can be embedded in the bottle mouth.
[0015] This application provides a bottle, including a heat-sterilizable cap, a bottle body, and a nozzle integrally formed with the bottle body; the heat-sterilizable cap is screwed onto the nozzle; and the bottle body is provided with anti-slip textures.
[0016] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, a rust-proof layer is set on the metal base as a primary rust-proof measure, and a passivation layer is set on the rust-proof layer, which can provide double protection for the bottle cap. Therefore, the cut position of the bottle cap will not rust.
[0017] Meanwhile, the sealing layer is injection molded inside the bottle cap, which results in a stronger bond, lower manufacturing cost, and better quality control. Attached Figure Description
[0018] Figure 1 This is a cross-sectional schematic diagram of one embodiment of the present utility model.
[0019] Figure 2 This is a structural schematic diagram of Embodiment 2 of this utility model.
[0020] Explanation of reference numerals in the attached diagram:
[0021] 1. Bottle cap; 10. Metal base layer; 11. Rust-proof layer; 12. Passivation layer; 13. Undercoat; 14. Printed layer; 15. Protective layer; 16. Sealing layer; 17. Sealing groove; 20. Bottle cap body; 21. Cap top; 22. Groove; 23. Cap body; 24. Anti-theft ring; 25. First thread; 26. Tear mark; 30. Bottle body; 31. Anti-slip texture. Detailed Implementation
[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0023] Example 1
[0024] Please refer to Figure 1 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, which is a heat-sterilizable bottle cap 1.
[0025] The metal base layer 10 is coated with an anti-rust layer 11, and then a passivation layer 12 is applied to the anti-rust layer 11. Therefore, the bottle cap 1 has double protection, and the cut area of the bottle cap 1 will not rust. At the same time, the sealing layer 16 is injection molded inside the bottle cap 1. This structure has a stronger bond, lower manufacturing cost, and better quality control.
[0026] This application provides a heat-sterilizable bottle cap 1, comprising a metal base layer 10, a rust-preventive layer 11 plated on the metal base layer 10, a passivation layer 12 disposed on the rust-preventive layer 11, a base coat 13 disposed on the passivation layer 12, a printing layer 14 disposed on the base coat 13, and a protective layer 16 disposed on the printing layer 14; the sealing layer 16 is injection molded inside the bottle cap 1. The metal base layer 10 is iron; the rust-preventive layer 11 is a chromium-plated layer or a tin-plated layer; the thickness of the bottle cap 1 is between 0.1mm-0.16mm or 0.26-0.40mm. The metal base layer 10 can be iron, and the rust-preventive layer 11 is plated on the metal base layer 10. Of course, the metal base layer 10 and the rust-preventive layer 11 can also be directly molded together, for example, a chromium-plated layer or a tin-plated layer. That is, the metal base layer 10 and the rust-preventive layer 11 are first plated together. The passivation layer 12 disposed on the rust-preventive layer 11 can further improve the rust prevention ability, and every part of the bottle cap 1, such as the cut and bend, will not rust. The anti-rust layer 11 is a chromium-plated or tin-plated layer, which can be applied by electroplating or chemical plating. Passivation refers to the process of oxidizing the metal with a strong oxidizing agent or electrochemical method, making the surface inactive, thus slowing down the corrosion rate of the metal. The undercoat 13 can be applied to the passivation layer 12 by spraying or printing. The undercoat 13 improves the adhesion between the passivation layer 12 and the printed layer 14, and also prevents the printed layer 14 from cracking during high-temperature sterilization. The protective layer 16 can be applied to the printed layer 14 by spraying or pasting. The protective layer 16 provides protection and prevents the bottle cap 1 from being scratched. The sealing layer 16 is elastic and provides a seal. The sealing layer 16 is injection molded inside the bottle cap 1. This design requires no additional adhesive, has good integrity, high strength, and lower manufacturing cost.
[0027] Preferably, the metal base layer 10 is stamped to form the bottle cap body 20. The bottle cap body 20 includes a cap top 21 and a cap body 23. The inner wall of the cap body 23 has a first thread 25 and a limiting flange 26, with the limiting flange 26 supporting the edge of the sealing layer 16. A groove 22 is provided on the cap top 21, and the top surface of the sealing layer 16 is embedded in the groove 22. The first thread 25 can be formed by a die rolling process. The first thread 25 facilitates the tightening of the bottle cap 1 at the bottle opening. When the sealing layer 16 is injection molded into the bottle cap 1, the limiting flange 26 supports the edge of the sealing layer 16, and the top surface of the sealing layer 16 is embedded in the groove 22. This design can improve the firmness of the sealing ring and the inside of the bottle cap 1, preventing it from falling off. At the same time, the sealing ring is tightly fitted with the limiting flange 26 and the groove 22, which can prevent the sealing ring from loosening due to thermal expansion and contraction, resulting in a stronger bond.
[0028] Preferably, an anti-theft ring 24 is provided at the bottom of the cap 23, and a tear 26 is provided between the anti-theft ring 24 and the cap 23. The anti-theft ring 24 is fitted onto the bottle opening, and after the bottle cap 1 is unscrewed, the anti-theft ring 24 will separate at the tear 26, which can play a role in preventing theft.
[0029] Preferably, the base coat 13 and the protective layer 16 are one of polyimide, polyethylene terephthalate, high-temperature resistant silicone, polyphenylene sulfone resin, high-temperature resistant resin, polyethylene, and polypropylene. The base coat 13 and the protective layer 16 can be applied using a spray coating process. The base coat 13 and the protective layer 16 can withstand high temperatures without cracking. For example, polyimide can withstand temperatures up to 400°C; polyethylene terephthalate can withstand temperatures up to 200°C. Therefore, this type of bottle cap 1 can withstand high-temperature sterilization without cracking or deterioration.
[0030] Preferably, the printing layer 14 is a patterned plastic film or a UV ink layer. The pattern is provided on the plastic film and can be adhered to the underlayer 13. When the printing layer 14 is a UV ink layer, a printing process can be used. UV ink layers can be cured by ultraviolet light, resulting in higher efficiency. A UV ink layer is an ink that can be cured by ultraviolet light. For example, the ink layer can be one of polyimide, polyethylene terephthalate, high-temperature resistant silicone, polyphenylene sulfone resin, or high-temperature resistant resin.
[0031] Preferably, the sealing layer 16 is one of polypropylene, polyethylene, polyethylene terephthalate, and polystyrene. In this embodiment, the sealing layer 16 is polypropylene, which is injection molded into the bottle cap 1.
[0032] Preferably, the bottom of the sealing layer 16 is provided with a sealing groove 17, which can be embedded in the bottle mouth. When the bottle cap 1 is tightened on the bottle mouth, the sealing groove 17 is embedded in the bottle mouth. This design can improve the sealing performance and prevent the liquid inside the bottle from spilling out.
[0033] Preferred manufacturing process for heat-sterilizable bottle cap 1: 1. Sheet metal pretreatment: Chrome-plated sheet metal → electrolytic passivation → spraying of the base layer 13 → printing of the printing layer 14 → UV curing. 2. Stamping: Stamping, blanking, and injection molding are completed using a multi-station continuous die. 3. Sealing layer 16 bonding: The PP material sealing layer 16 is injection molded into the inside of the bottle cap 1 in the injection molding machine mold.
[0034] The bottle cap 1 in this embodiment was tested and found to have a pressure resistance of 1.25 MPa before sterilization and 0.45 MPa after sterilization; the gasket showed a dimensional change rate of 0.3% after being placed in a high-temperature environment of 100-130℃ for half an hour; no visible rust spots were found on the cap after the damp heat test; and the sealing performance was improved by 75% compared to commercially available tin-plated caps (pressure resistance of 0.28 MPa after sterilization). Through the synergistic rust prevention of chrome-plated iron sheet and composite coating, the optimized formulation of the PP material sealing layer 16, and the in-mold injection molding process, a high sealing retention rate and structural integrity are achieved after sterilization. The overall performance is significantly better than that of traditional tin-plated caps, making it suitable for harsh working conditions such as ultra-high temperature instantaneous sterilization.
[0035] Example 2
[0036] Example 2 includes the heat-sterilizable bottle cap 1 from Example 1. This application provides a bottle comprising a heat-sterilizable bottle cap 1, a bottle body 30, and a bottle mouth integrally formed with the bottle body 30; the heat-sterilizable bottle cap 1 is screwed onto the bottle mouth; the bottle body 30 is provided with anti-slip textures 31. This heat-sterilizable bottle cap 1 facilitates sterilization, and after being screwed onto the bottle mouth, it provides a good seal and will not loosen. The anti-slip textures 31 facilitate unscrewing the bottle cap 1.
[0037] In summary, the key design feature of this invention lies in the following: a rust-preventive layer 11 is provided on the metal base layer 10 as a primary rust-preventive measure; a passivation layer 12 is provided on the rust-preventive layer 11 as a secondary rust-preventive measure; the bottle cap has a double-layer rust-preventive measure, therefore the cut area of the bottle cap will not rust. Simultaneously, the sealing layer 16 is injection-molded inside the bottle cap, resulting in a stronger bond, lower manufacturing cost, and better quality control.
[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A heat-sterilizable bottle cap, characterized in that: It includes a metal base layer, a rust-proof layer plated on the metal base layer, a passivation layer set on the rust-proof layer, a base layer set on the passivation layer, a printing layer set on the base layer, and a protective layer set on the printing layer; the sealing layer is injection molded inside the bottle cap.
2. The heat-sterilizable bottle cap according to claim 1, characterized in that: The bottle cap body is formed by stamping a metal base layer. The bottle cap body includes a cap top and a cap body. The inner wall of the cap body has a first thread and a limiting flange, and the limiting flange supports the edge of the sealing layer.
3. A heatable sterilizable bottle cap according to claim 2, characterized in that: A groove is provided on the top of the cover, and the top surface of the sealing layer is embedded in the groove.
4. A heatable sterilizable bottle cap according to claim 2, characterized in that: The bottom of the cover is provided with an anti-theft ring, and a tear is provided between the anti-theft ring and the cover.
5. A heatable sterilizable bottle cap according to claim 1, characterized in that: The metal base layer is iron; the rust-proof layer is a chromium-plated layer or a tin-plated layer; the thickness of the bottle cap is between 0.1mm-0.16mm or 0.26-0.40mm.
6. A heatable sterilizable bottle cap according to claim 1, characterized in that: The underlayer and protective layer are one of polyimide, polyethylene terephthalate, high-temperature resistant silicone, polyphenylene sulfone resin, high-temperature resistant resin, polyethylene, and polypropylene.
7. A heatable sterilizable bottle cap according to claim 1, characterized in that: The printed layer is a patterned plastic film or a UV ink layer.
8. A heatable sterilizable bottle cap according to claim 1, characterized in that: The sealing layer is one of polypropylene, polyethylene, polyethylene terephthalate, and polystyrene.
9. A heatable sterilizable bottle cap according to claim 1 or 8, characterized in that: The bottom of the sealing layer is provided with a sealing groove, which can be embedded in the bottle mouth.
10. A bottle, characterized in that: The invention includes a heatable sterilizable bottle cap, a bottle body, and a bottle nozzle integrally formed with the bottle body, as described in any one of claims 1-9; the heatable sterilizable bottle cap is screwed onto the bottle nozzle; and the bottle body is provided with anti-slip textures.