Pressure Can End Countersink Structure for Thin-Metal Strength
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Solution Overview
Problem
Metallic can ends deform under pressure changes during food processing due to insufficient strength when made from thin metal, necessitating a solution to resist both internal and external pressures without increasing material thickness.
Innovation Solution
The can end design incorporates a center panel, an annular portion with an enhanced annular countersink and tapered portion, allowing for reduced material thickness while maintaining pressure resistance through specific tooling and forming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If can ends are made from thinner metal to reduce material consumption, then material usage decreases, but the can ends deform under pressure changes during processing
Solution Approach 1:
The patent applies local quality by creating specific geometric features (enhanced annular countersink, tapered portion, and reinforcement rib) in localized areas of the can end where structural strength is most needed. These features concentrate material and structural complexity only where required to resist buckling pressures, rather than uniformly thickening the entire can end, thus maintaining overall material reduction while providing targeted strength enhancement.
Solution Approach 2:
The patent utilizes curvature principles by forming the annular countersink and tapered portion with specific radii and arc angles. The enhanced annular countersink includes a first radius and second radius creating a curved, multi-faceted structure that distributes stress more effectively than flat surfaces. This curvature allows thinner material to achieve equivalent or superior pressure resistance compared to thicker flat metal.
2Loss of substance
If can ends are made from thinner metal to reduce material consumption, then material usage decreases, but the can ends lose structural integrity under buckle and reverse buckle pressures
Solution Approach 1:
The patent applies segmentation by dividing the can end structure into distinct functional zones: the center panel, the annular portion with enhanced countersink, the tapered portion, and the reinforcement rib. Each segment serves a specific structural purpose in resisting different types of pressure loads. The reinforcement rib specifically segments the annular portion to prevent radial buckling, while the tapered portion handles axial loading, creating a modular approach to maintaining reliability with reduced material.
Solution Approach 2:
The patent creates a composite-like structure using a single material by forming multi-layered geometric features. The enhanced annular countersink with multiple radii and the tapered portion create a composite geometric structure that combines the advantages of different thickness zones and curvature profiles, achieving the structural integrity of composite materials through geometric complexity rather than material composition.
3Loss of substance
If can ends are made from thinner metal to reduce material consumption, then material usage decreases, but the can ends cannot withstand external pressure during sterilization
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the can end structure - specifically the radius of the enhanced annular countersink, the angle and depth of the tapered portion, and the height and position of the reinforcement rib. These parameter changes create a structure with optimized stress distribution characteristics that enable thinner material to withstand external sterilization pressures equivalent to or greater than traditional thicker designs.
Data Source
AI summary
A can end including a center panel, an annular portion disposed about the center panel, a standard chuck wall disposed about the annular portion, and a curl extending radially outwardly from the standard chuck wall. The annular portion includes an enhanced annular countersink.