Bottle Can Curled Opening Structure for Capping Load Resistance
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Solution Overview
Problem
The conventional curled portion of bottle-shaped cans is prone to deformation under vertical loads, such as capping pressure, leading to a loss of sealing integrity and tamper evidence functionality.
Innovation Solution
The proposed structure includes a shoulder section, a cylindrical neck section, a threaded section, a cap, a bead for tamper evidence, and a curled portion with specific geometrical features: an inner circumferential wall, an upper rounded portion, an outer circumferential wall, a lower rounded portion, a folded end, and a margin surface area with a longer curvature radius than the lower rounded portion, ensuring the curled portion maintains its shape under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the curled portion is formed by folding the opening edge into multiple layers and flattening it, then the sealing ability and tamper-evidence function are improved, but the curled portion becomes prone to deformation under vertical loads such as capping pressure
Solution Approach 1:
The patent applies curvature by forming a rounded portion at the lower end of the curled portion instead of a sharp edge. This rounded geometry distributes stress more evenly under vertical loads, preventing the deformation that occurs with sharp-edged folded structures. The curvature radius is specifically controlled to be 0.5-2.0 times the thickness of the metal sheet to optimize both sealing contact and load resistance.
Solution Approach 2:
The patent changes geometric parameters of the curled portion, specifically controlling the curvature radius of the rounded portion and the folding angles. By optimizing these parameters, the structure achieves both adequate sealing contact (requiring certain curvature) and resistance to deformation (requiring appropriate stiffness through parameter control).
2Reliability
If the curled portion is formed with sharp edges to ensure tight sealing contact, then the sealing integrity is improved, but the edge of the metal sheet material becomes susceptible to corrosion
Solution Approach 1:
The rounded portion replaces the sharp edge of the metal sheet, eliminating the crevice corrosion risk associated with sharp edges while maintaining adequate sealing contact. The curvature provides a smooth transition that prevents fluid accumulation and eliminates the geometric discontinuity that promotes corrosion initiation.
Solution Approach 2:
The patent converts the potentially harmful sharp edge into a beneficial rounded feature. The rounding process, while modifying the geometry, actually improves corrosion resistance by eliminating the sharp edge vulnerability while maintaining sealing effectiveness through controlled curvature.
3Reliability
If the curled portion is folded into multiple layers to enhance tamper-evidence function, then the TE function is improved, but the manufacturing complexity increases
Solution Approach 1:
The curled portion is segmented into distinct functional zones: an upper sealing portion with controlled folds for tamper evidence, and a lower rounded portion for load distribution. This segmentation allows each zone to be optimized independently while simplifying the overall manufacturing process by reducing the number of complex folds required.
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
This design enhances the durability of the curled portion against vertical loads, maintaining sealing integrity and ensuring the tamper evidence function, thereby preventing beverage leakage and ensuring product quality.
Implementation Method 1
the sealing member (i.e., a liner) is elastically deformed thereby pushing up the cap elastically
Data Source
AI summary
A structure of an opening curled portion of a bottle-shaped can possible to enhance the durability of a curled portion against a load applied from above so as to ensure tamper evidence function. The curled portion 10 comprises: an inner circumferential wall 16; an upper rounded portion 17; an outer circumferential wall 20; a lower rounded portion 21; a folded end 22; and a leading edge 23. A tapered wall 15 is formed below the inner circumferential wall 16 to be joined to a threaded section while increasing an outer diameter thereof downwardly. A margin surface area 24 is formed between the inner circumferential wall 16 and the tapered wall 15, in such a manner as to extend downwardly from a lowest end 25 of a contact area with the folded end 22, to locate a curvature center P2 thereof outside of the neck section, and to set a curvature radius R2 thereof longer than a curvature radius R1 of the lower rounded portion 21 in a cross-section along a center axis O of the neck section.