Closure Cap Frangible Connection Geometry
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Solution Overview
Problem
Prior art closures with a cap and sleeve do not provide a clean break and inconsistent material distribution at the juncture after the cap is broken away from the sleeve, leading to suboptimal performance in forming an extended bead.
Innovation Solution
A closure design featuring a cap and sleeve with a frangible connection, where the cap has angled segments and a projection that forms an extended bead upon separation, ensuring a clean break and consistent material distribution, facilitated by specific angles and thickness ratios in the cap's geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a frangible connection is used to allow cap separation from the sleeve, then the cap can be broken away to enable dispensing, but the break is not clean and material distribution on the bead is inconsistent
Solution Approach 1:
The cap is divided into multiple segments (first segment and second segment) that are positioned at specific angles relative to the axis. These segments are located proximate to the frangible connection and are designed to break away in a controlled manner, ensuring clean separation from the sleeve while maintaining consistent material distribution on the resulting bead.
Solution Approach 2:
The frangible connection is positioned at a specific location proximate to the inner diameter of the sleeve and at specific distances from the cap end. The segments are arranged at precise angular positions (θ1 and θ2 between 75-105 degrees) to ensure that the break occurs at the optimal location, creating a clean separation and consistent bead formation at the juncture of the cap and sleeve.
2Manufacturing precision
If the frangible connection is positioned to enable clean break, then separation quality improves, but the structural integrity of the closure may be compromised
Solution Approach 1:
The frangible connection is pre-positioned during manufacturing at an optimal location proximate to the inner diameter of the sleeve, at a specific distance from the cap end. This preliminary positioning ensures that when separation is needed, the break occurs cleanly at the predetermined location without compromising the overall structural integrity of the closure during normal use.
Solution Approach 2:
The closure design incorporates specific geometric parameters including angles θ1 and θ2 (each between 75-105 degrees) for the segments, and specific distance ratios (0.05-0.15 times the cap axial length) for the frangible connection positioning. These controlled parameter variations allow the frangible connection to be strategically placed to achieve clean break while maintaining sufficient structural strength for normal operation.
Data Source
AI summary
The invention generally relates to a closure having a cap coupled to a sleeve defining a frangible connection between the cap and the sleeve. A preselected geometry is provided between the cap and the sleeve proximate to the frangible connection which allows for formation of a clean break between the cap and the sleeve when the cap is broken away from the sleeve. An extended bead is also provided with consistent material distribution on the bead proximate to a juncture of the cap to the sleeve after the cap is broken away from the sleeve. A projection is additionally provided on the cap which projects at an angle. The projection has a generally tapering leg of reduced thickness that terminates in a vertical wall segment. The projection also has the bead that is formed located on an outer corner of the projection after the frangible connection is broken.