Curved Reduced-Diameter Bottle Can Neck for Stable Pouring
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Solution Overview
Problem
Bottle cans with reduced diameter portions in step or truncated conical shapes suffer from low radial strength, leading to pulsation issues during beverage pouring, especially with large capacities, and provide a square impression rather than a smooth appearance.
Innovation Solution
A bottle can design featuring a convex curved portion connecting to a concave curved portion, which in turn connects to the neck portion, enhancing radial strength and providing a smooth, soft impression, with a manufacturing method that includes forming these curved features to improve the bottle's structural integrity and pouring properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reduced diameter portion is formed in a step shape or truncated conical shape, then the manufacturing process is simplified, but the radial strength becomes low causing pulsation during pouring
Solution Approach 1:
The reduced diameter portion is formed with a curved surface having a radius of curvature of 30mm or more, replacing the conventional step shape or truncated conical shape. This curvature provides structural reinforcement that increases radial strength and prevents pulsation during pouring, while maintaining manufacturing feasibility through a single curved forming operation.
2Ease of manufacture
If the reduced diameter portion is formed in a step shape or truncated conical shape, then the manufacturing process is simplified, but the appearance becomes square rather than smooth
Solution Approach 1:
The reduced diameter portion is formed with a curved surface having a radius of curvature of 30mm or more, creating a smooth, rounded appearance that eliminates the square impression caused by step shapes or truncated cones. The curved surface provides aesthetic improvement while being manufacturable through standard forming processes.
3Quantity of substance
If the reduced diameter portion has a large capacity design, then the content volume is increased, but pulsation occurs during pouring
Solution Approach 1:
The curved surface with a radius of curvature of 30mm or more in the reduced diameter portion provides structural reinforcement that suppresses pulsation during pouring, even in large capacity bottles (500ml or more). The curvature distributes stresses evenly and prevents the formation of standing waves in the liquid, ensuring stable pouring performance.
Data Source
AI summary
A bottle can made of aluminum alloy has a base portion; a cylindrical body portion connected to an upper end of the base portion; a reduced diameter portion where a diameter reduces from an upper end of the cylindrical body portion to an upper side; a neck portion provided at an upper side of the reduced diameter portion; and a mouth portion having a male thread portion and a bulge portion provided at an upper side of the neck portion. The reduced diameter portion has: a convex curved portion continuing to the upper end of the cylindrical body portion; a concave curved portion continuing to an upper end of the convex curved portion; a lower convex portion continuing to an upper end of the concave curved portion; and an upper concave portion continuing an upper end of the lower convex portion and a lower end of the neck portion.