Can Lid Thickness Profile for Pressure and Buckling Resistance
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Solution Overview
Problem
Metal cans face challenges in maintaining pressure resistance while reducing plate thickness to conserve material resources and weight, particularly when containing carbonated beverages that may experience abnormal pressure increases.
Innovation Solution
The can lid design incorporates specific thickness relationships (t2 > t1, t3 > 1.01 * t1) for the panel and chuck wall radius parts, with controlled thickness adjustments to enhance pressure resistance while minimizing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If plate thickness is reduced to save material resources and reduce weight, then material consumption and weight decrease, but pressure resistance deteriorates
Solution Approach 1:
The can lid employs non-uniform plate thickness distribution, with the panel wall part having greater thickness than the center panel part. This local quality variation concentrates material where pressure resistance is most needed (at the panel wall where buckling occurs) while maintaining thinner sections where less strength is required, thereby resolving the contradiction between material reduction and pressure resistance.
Solution Approach 2:
The invention changes the thickness parameter of the plate in specific regions, establishing a thickness gradient where t1 (center panel) < t2 (panel wall). This parameter modification allows the structure to achieve optimal pressure resistance with reduced overall material consumption, directly addressing the technical contradiction.
2Weight of moving object
If plate thickness is reduced to reduce weight, then weight decreases, but pressure resistance deteriorates
Solution Approach 1:
By implementing local quality variation through non-uniform thickness distribution (thinner center panel, thicker panel wall), the design reduces overall weight while concentrating structural strength where pressure resistance is critical, thus resolving the weight-strength contradiction.
Solution Approach 2:
The thickness parameter is modified in specific regions to create a gradient structure, reducing overall material mass and weight while maintaining adequate pressure resistance at critical locations, thereby resolving the contradiction between weight reduction and strength maintenance.
3Loss of substance
If uniform thin plate is used to reduce material consumption, then material consumption decreases, but buckling resistance deteriorates
Solution Approach 1:
The can lid uses non-uniform thickness distribution with the panel wall part being thicker than the center panel part. This local quality enhancement at the panel wall specifically improves buckling resistance where it is most needed during pressure increases, while maintaining overall material efficiency.
Data Source
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Figure 3(a)~3(d)
AI summary
By conducting a strict study on a plate thickness, a pressure resistance is improved while satisfying the demand for further reduction of the plate thickness. A can lid has a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part. t2 > t1 holds, where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.