Resin-Laminated Can Lid Tab for Rotation-Resistant Opening
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Solution Overview
Problem
Conventional stay-on-tab can lids face difficulties in preventing tab rotation in the circumferential direction, leading to reduced lid openability due to misalignment of the tab's center with the rivet line, which complicates manufacturing and increases costs.
Innovation Solution
A can lid configuration featuring a laminated metal plate tab with a resin film and printing layer, where the tab is formed by pressing and curling, and assembled with a rivet to maintain alignment and prevent rotation, using a simple manufacturing process that includes gravure printing and bonding layers to enhance stability and decorativeness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tab is fixed to the panel portion with a rivet allowing rotation, then the tab can be operated easily, but the tab may rotate in the circumferential direction causing misalignment and reducing lid openability
Solution Approach 1:
The tab is designed with an asymmetric shape where the center of gravity does not coincide with the rotation axis (rivet center). This asymmetric configuration creates a self-aligning mechanism where gravity naturally positions the tab correctly during operation, preventing circumferential rotation while maintaining ease of operation.
2Manufacturing precision
If special forming of tab and can lid body is used to prevent tab rotation, then tab alignment is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The invention changes the geometric parameters of the tab, specifically positioning the center of gravity at a predetermined location that is offset from the rivet center. This parameter change creates a self-aligning effect through gravity, achieving precise tab alignment without requiring complex forming processes or additional manufacturing steps.
Data Source
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AI summary
A tab (14) formed of a metal plate (50) in which a resin film (52) is laminated on at least one main surface of a base member (51) made of a metal material, includes: a fixing portion including a rivet hole (31a) into which a rivet (21) formed on a panel portion (11) of a can lid (1) is inserted; a pressing portion (32) formed integrally with the fixing portion (31) and configured to press a portion in a region defined by a score line (22) formed on the panel portion (11); and a finger hook portion (33) formed integrally with the pressing portion (32).