Bottle Can Curl Geometry for Impact-Resistant Cap Sealing
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Solution Overview
Problem
The existing design of the curl part in bottle cans causes sealability issues when the cans are subjected to impact, as the deformation of the curl part leads to separation of the contact point with the liner material inside the cap, resulting in leakage.
Innovation Solution
A bottle can design featuring a curl part with an upper end curved outward and an outer wall part extending downward, forming a predetermined angle between the lower end face of the outer wall and the neck shoulder part, allowing the inner edge of the lower end face to contact the neck shoulder part upon impact, enabling the curl part to deform outward and maintain sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hook is continuously provided at the lower end of the outer face side wall part and bent inward in the radial direction, then the curl part can be formed to engage with the cap, but the lower end face of the hook presses the mouthpiece part inward under impact, causing the curl part to deform inward and separate from the liner material
Solution Approach 1:
The invention inverts the conventional hook design by making the lower end face of the outer wall part open outward at a predetermined angle instead of bending inward. This inversion changes the deformation behavior under impact: instead of pressing inward and separating from the liner material, the curl part now deforms outward while maintaining contact through the inner edge of the lower end face, thereby preserving sealability.
Solution Approach 2:
The invention applies local quality by creating a specific angular configuration only at the lower end face of the outer wall part, while the rest of the curl part structure remains substantially unchanged. This localized modification at the critical contact region enables the curl part to withstand impact forces without compromising the overall sealing function.
2Ease of manufacture
If the lower end edge of the hook is formed parallel to the inclined surface of the mouthpiece part, then the manufacturing process is simplified, but the contact part between the curl part and liner material is easily separated under impact
Solution Approach 1:
The invention changes the geometric parameter of the lower end face of the outer wall part by forming it at a predetermined angle (10° to 90°) relative to the axis direction, rather than making it parallel to the mouthpiece part inclined surface. This parameter change ensures that under impact, the inner edge of the lower end face contacts the mouthpiece part first, causing outward deformation that maintains sealability while remaining compatible with existing manufacturing processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design prevents degradation of sealability by allowing the curl part to deform outward, maintaining contact with the liner material and preventing leakage even under impact, with optimal performance when the angle is between 10° to 90° and the gap is 0.3 mm or less.
Implementation Method 1
When receiving a downward load from above, the upper side of the curl part deforms so as to bend outward with the contact part as a fulcrum
Data Source
AI summary
A bottle can has a curl part at an opening end of a mouth part thereof. The curl part has an upper end curved part in which an upper part of a neck shoulder part of the mouth part is curved outward and an outer wall part extending downward from the upper end curved part. A predetermined angle at which an outer edge side of a lower end face of the outer wall part opens is formed between the lower end face of the outer wall part and the neck shoulder part. An inner edge of the lower end face comes into contact with the neck shoulder part when a downward load is applied to the curl part from above.