Can Lid Shell Curvature and Local Thickening for Pressure Resistance
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Solution Overview
Problem
Existing can lids experience buckling and leakage due to excessive internal pressure when exposed to high temperatures, leading to cracks and inability to maintain contents.
Innovation Solution
A can lid shell design with thickened curved surface portions and a forming device that increases mechanical strength by forming a can lid shell with a panel section, countersink section, and flange section, featuring convex and concave curved surfaces to enhance pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the can lid shell uses a linear chuck wall shape as in the related art, then the manufacturing process is simple, but the pressure resistance strength is insufficient causing buckling under high internal pressure
Solution Approach 1:
The patent applies curvature to the chuck wall section by forming a second curved surface portion that is concave from the internal space, and the panel section has a first curved surface portion that is convex toward the internal space. These curved surfaces distribute stress more effectively than linear shapes, preventing buckling under high internal pressure while maintaining structural integrity.
Solution Approach 2:
The patent thickens specific portions of the can lid shell locally, particularly the first curved surface portion and second curved surface portion, to increase pressure resistance strength where needed. This localized thickening provides enhanced strength at critical areas without uniformly increasing the weight of the entire can lid shell.
2Weight of moving object
If the can lid shell thickness is reduced to decrease weight, then the weight is reduced, but the pressure resistance strength becomes insufficient causing buckling
Solution Approach 1:
The patent implements local thickening of the first curved surface portion and second curved surface portion to provide enhanced pressure resistance strength at critical areas. This allows the overall can lid shell to maintain reduced weight while specific thickened regions prevent buckling under high internal pressure.
Solution Approach 2:
The curved surface design distributes stress more effectively throughout the structure, allowing thinner overall material usage while maintaining strength at critical locations through strategic curvature and localized thickening.
3Weight of moving object
If the panel section area is reduced to decrease weight, then the weight is reduced, but the internal pressure distribution becomes unfavorable causing buckling
Solution Approach 1:
The first curved surface portion convex toward the internal space and the second curved surface portion concave from the internal space create a pressure-distributing geometry that maintains stable internal pressure distribution even with a reduced panel section area, preventing buckling while maintaining weight reduction.
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A can lid shell 10 includes a panel section 11 having a circular peripheral edge, a countersink section 12 formed and recessed along the peripheral edge of the panel section 11, a chuck wall section 13 rising from an edge of the countersink section 12, and a flange section 14 protruding from an upper end of the chuck wall section 13. The countersink section 12 includes a first curved surface portion 123C that is convex toward an internal space SP1. The chuck wall section 13 includes a second curved surface portion 131 that is connected to the first curved surface portion 123C and that is concave toward the internal space SP1. Furthermore, the second curved surface portion 131 and the first curved surface portion 123C are formed to be thicker as both are directed from an edge p8 on the flange section 14 side to an edge p6 on the panel section 11 side.