Easy Open Can Lid Multilayer Protection Structure
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Solution Overview
Problem
Conventional full-open type can lids require excessive force to open due to interference between folded portions, leading to poor openability and potential damage to the inner surface during the forming process, while also posing a risk of injury from the ruptured score line edge.
Innovation Solution
The easy open can lid features a disc-shaped panel with a suborbicular score line, outer and inner multilayered portions, and protection edges that do not contact the score line during opening, enhancing openability and preventing damage to the inner surface by optimizing the radial distances and interspaces between layers, allowing efficient force transmission and reducing the need for extensive touch-up work.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If folded portions are situated across the score line to cover the opening edge, then hand protection is improved, but excessive force is required to open the can lid
Solution Approach 1:
The protection structure is divided into outer and inner multilayered portions with distinct functions. The outer multilayered portion covers the score line edge for protection, while the inner multilayered portion provides structural support. This segmentation allows each portion to be optimized independently, resolving the contradiction between protection and openability.
Solution Approach 2:
Different regions of the multilayered structure have different properties. The outer multilayered portion has layers extending in specific directions to provide protection, while the inner multilayered portion has different layer configurations for stiffness. This local differentiation allows the structure to provide both protection and ease of opening in different locations.
2Strength
If clearance between score line surface and outer folded portion is maintained widely, then stiffness in panel portion is improved, but openability deteriorates and inner folded portion formation becomes difficult
Solution Approach 1:
The solution moves from a two-dimensional clearance problem to a three-dimensional multilayered structure. By creating multiple layers extending in different directions, the structure provides stiffness through vertical layering rather than horizontal clearance, enabling both stiffness and openability to be achieved simultaneously.
3Object-affected harmful factors
If clearances between inner folded portion layers are narrowed, then formation difficulty increases and inner surface quality deteriorates, but hand protection is improved
Solution Approach 1:
The protection function is segmented between the outer multilayered portion and inner multilayered portion. The outer portion provides the primary protection function, allowing the inner portion to maintain wider clearances for better formation quality and surface finish, while still contributing to overall protection through its structural configuration.
Data Source
AI summary
An easy open can lid comprises an outer multilayered portion folded into three layers and enclosing the panel portion from outside of the score line, and an inner multilayered portion folded into three layers and enclosing the panel portion from inside of the score line. A leading edge of an outer protection portion as a folding portion between the first and second outer layers is flush with or situated outside of the score line, and a leading edge of an inner protection portion as a folding portion between the second and third inner layers is flush with or situated inside of the score line. An opening width of an inner interspace between the first and second inner layers is wider than that of an outer interspace between the second and third outer layers.