Easy Open Closure Bead Design for Can End Integrity
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Solution Overview
Problem
Easy-open can ends face challenges in balancing abuse resistance, opening performance, and pressure resistance, with design changes in can manufacturing leading to increased costs and production disruptions due to interdependent features, and existing solutions either compromise on ease of opening or introduce weaknesses in pressure resistance.
Innovation Solution
A metal closure design featuring two spaced apart, elongate raised beads that terminate under the tab and are parallel to the circumferential score, providing support against downward pressure and facilitating easy opening by allowing the nose portion to pivot and fracture the score effectively, while maintaining strength and preventing unintended fracturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the can end and score is increased to improve can end integrity and pressure resistance, then the ability to resist pressure is improved, but the ease of opening deteriorates
Solution Approach 1:
The patent introduces furrows (beads) at specific locations on the can end to provide localized strengthening. These beads are positioned to reinforce the can end structure without requiring an overall increase in thickness, thereby maintaining ease of opening while improving integrity at critical stress points.
Solution Approach 2:
The can end is divided into multiple functional zones with different structural characteristics. The furrows create segmented regions that distribute stress differently across the can end, allowing the score to fracture cleanly during opening while the overall structure maintains strength to resist pressure.
2Reliability
If design changes are made to improve can end performance, then the functional requirements are better met, but manufacturing costs increase and production is disrupted
Solution Approach 1:
The can end design incorporates pre-formed furrows and strategically positioned features that are created during the standard can ending process. This preliminary structuring ensures that when the can is opened, the score fractures at the intended location without requiring additional manufacturing steps or production line modifications.
3Strength
If features are modified to improve one aspect of can end performance, then that aspect is improved, but other features may no longer function as intended
Solution Approach 1:
The patent places furrows and other structural features at specific locations that are carefully selected to avoid interfering with the function of other can end features. Each localized modification is positioned to provide strength where needed while maintaining the proper functioning of tabs, scores, and sealing surfaces elsewhere on the can end.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances abuse resistance and opening performance by distributing pressure and reducing the risk of score fracturing during stacking or handling, while maintaining satisfactory pressure resistance and ease of opening, thus addressing the limitations of existing can end designs.
Implementation Method 1
providing support against downward pressure and facilitating easy opening by allowing the nose portion to pivot and fracture the score effectively
Implementation Method 2
lifting of the heel portion forces the nose portion into contact with a region of the panel adjacent to the radially inner edge of the circumferential score, thereby causing the closure to fracture partially along the score
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
A metal closure (201) for seaming onto the end of a container, the closure (201) comprising a centre panel (202) defined by a circumferential score (102, 203), a tab (106, 205) fixed to the panel (202) by a rivet (105, 206) formed in the panel (202), and two spaced apart, elongate raised beads (208) formed in the panel (202). The tab (106, 205) has a heel portion radially inside of the rivet (105, 206) and a nose portion (108, 207) radially outside of the rivet (105, 206) and adjacent to a radially inner edge of the score (102, 203), such that lifting of the heel portion forces the nose portion (108, 207) into contact with a region of the panel (202) adjacent to the radially inner edge of the circumferential score (102, 203), thereby causing the closure (201) to fracture partially along the score (102, 203). The beads extend with a circumferential component of direction, and each has an end terminating under the tab (106, 205) radially between the rivet (105, 206) and the score (102, 203).