Curved Beverage Can End Geometry for Consistent Double Seaming
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Solution Overview
Problem
Modern lightweight beverage can ends face issues with consistency in seam dimensions during double seaming, leading to potential failure under pressure or distortion, which can result in eversion of the end profile.
Innovation Solution
A lightweight beverage can end design featuring a specific configuration of panels and walls, including an arcuate panel wall, an upwardly opening annular bead, and a seaming panel with a defined radius, which allows for reliable and consistent seaming when used with conventional seaming technology, ensuring a secure attachment to the can body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lightweight beverage can end design is used, then weight is reduced, but seam dimension consistency deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling geometric parameters of the can end structure, including the seaming panel radius (R4 between 0.050-0.060 inches), panel wall deviation (D1 between 0.0008-0.009 inches), and wall angles (A2 less than 11 degrees, A4 at least 13 degrees). These parameter specifications ensure consistent seam dimensions while maintaining lightweight construction.
Solution Approach 2:
The patent utilizes curvature through the arcuate panel wall configuration and the specifically curved seaming panel with defined radius R4. The curved upper transition wall and arcuate bead profile create smooth transitions that promote uniform deformation during seaming, improving seam consistency in lightweight ends.
2Weight of moving object
If the can end structure is simplified for lightweight construction, then weight is reduced, but structural integrity under pressure deteriorates
Solution Approach 1:
The patent applies local quality by concentrating structural reinforcement in specific critical areas: the arcuate bead provides localized support at the transition zone, the curved upper transition wall reinforces the upper section, and the specifically configured seaming panel strengthens the seaming region. This allows lightweight construction overall while maintaining strength where needed.
Solution Approach 2:
The patent uses curvature as a strengthening mechanism through the arcuate panel wall and curved transition walls. These curved geometries distribute stress more effectively during pressurization and thermal processing, preventing buckling and eversion while maintaining minimal weight.
3Device complexity
If conventional seaming technology is used, then equipment complexity is minimized, but seam consistency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the can end with specific geometric parameters (seaming panel radius R4, panel wall deviation D1, wall angles A2 and A4) before the seaming process. This preliminary preparation ensures that conventional seaming equipment can produce consistent seams without requiring complex equipment modifications.
Solution Approach 2:
The patent changes the geometric parameters of the can end to be compatible with conventional seaming equipment, specifically the seaming panel radius (R4 between 0.050-0.060 inches) and wall angles. This parameter optimization allows standard equipment to achieve improved seam consistency.
Data Source
AI summary
A beverage can end has an arcuate panel wall and a chuck wall having a curved transition wall portion. Configuration of the seaming panel and panel wall is provided.