Bottle Can Curl Structure for High-Pressure Sealing
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Solution Overview
Problem
Conventional bottle can designs face issues with sealability under high pressure and during heat sterilization, as well as bubbling-over during cap opening, due to the separation of the seal point from the liner material, leading to potential misrecognition of reseal and leakage.
Innovation Solution
The bottle can features a curl part with a first and second bent part on its outer wall, creating a locking mechanism that hooks the liner material, ensuring high sealability and reducing bubbling-over, while adjusting the undercut amount to prevent excessive reseal torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the undercut amount of liner material is increased to prevent bubbling-over, then bubbling-over is suppressed, but reseal torque increases causing misrecognition of reseal
Solution Approach 1:
The undercut is localized to specific regions where bubbling-over prevention is needed, rather than increasing the overall undercut amount. The locking part provides localized engagement that prevents excessive liner material from causing high reseal torque, while still suppressing bubbling-over at the critical sealing interface.
2Reliability
If the outer face side wall part is extended in the can axis direction, then sealability is improved, but the connecting part moves away from the upper end causing structural complexity
Solution Approach 1:
The outer face side wall part and the curl part are merged into a continuous outer wall part structure. This integration simplifies the overall structure while maintaining the sealing benefits of the extended outer face side wall part. The curl part is formed as a natural continuation of the outer wall part, reducing structural complexity.
Data Source
AI summary
The present application improves the shape of a curl part of a bottle can to secure high sealability even under high pressure in the can and during heat sterilization, makes bubbling-over occur less during cap opening, and suppresses misrecognition of reseal.A bottle can has a curl part provided at an opening end of a mouth part. The curl part includes an outer wall part extending downward from an upper end bent part. The outer wall part includes a first bent part shaping a locking part that extends continuously and downwardly from the upper end bent part and shapes an outwardly-protruding convex, and a second bent part that extends continuously and downwardly from the first bent part and shapes an inwardly-protruding convex.