Can Tab Tooling With Arcuate Strips for Thin-Gauge Forming
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Solution Overview
Problem
The can making industry faces challenges in manufacturing tabs from reduced gauge metal stock, resulting in inconsistent tab strength and aesthetic issues due to kinks and wrinkles, which affect the predictability of metal flow and the appearance of the tab.
Innovation Solution
The use of tooling with a first generally planar surface connected to an arcuate surface and a second tool with a second projection to form arcuate strips on the tab's surface, allowing for controlled bending and curling of the tab, reducing kinks and wrinkles, and enabling the use of reduced gauge metal while maintaining sufficient strength and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If reduced gauge metal stock is used to manufacture tabs, then metal consumption is reduced, but tab strength becomes inconsistent and insufficient
Solution Approach 1:
The patent applies local quality by creating arcuate strips with different metal flow characteristics in specific regions of the tab. These strips have modified grain structure and thickness variations that provide enhanced strength locally at critical areas (curlled portions and peripheral surfaces) while maintaining reduced gauge thickness in other areas, thus resolving the contradiction between overall metal reduction and localized strength requirements
Solution Approach 2:
The arcuate strips are formed during the tab manufacturing process before the tab is attached to the can end. This preliminary formation of controlled thickness variations and grain structure modifications ensures that the metal flow is predetermined and controlled during subsequent curling operations, preventing strength inconsistencies that would otherwise occur with reduced gauge metal
2Loss of substance
If reduced gauge metal stock is used to manufacture tabs, then metal consumption is reduced, but kinks and wrinkles appear on the tab surface
Solution Approach 1:
The arcuate strips create localized variations in metal thickness and grain structure that control the flow of metal during forming operations. By having different properties in different locations (thinner in some areas, thicker in others), the metal flows more uniformly during curling, preventing the formation of kinks and wrinkles on the surface while maintaining overall reduced gauge thickness
Solution Approach 2:
The patent changes physical parameters of the metal stock by creating arcuate strips with modified thickness and grain structure. These parameter changes in the metal properties allow controlled deformation during manufacturing, enabling the metal to be formed into curled portions without developing surface defects like kinks and wrinkles, thus maintaining high manufacturing precision with reduced gauge material
3Loss of substance
If reduced gauge metal stock is used to manufacture tabs, then metal consumption is reduced, but metal flow becomes unpredictable
Solution Approach 1:
The arcuate strips are formed in advance during tab manufacturing, creating predetermined patterns of thickness variations and grain structure modifications. This preliminary action establishes controlled metal flow paths before the tab is assembled and used, ensuring that metal flows predictably during subsequent operations such as curling, eliminating the unpredictability that would otherwise occur with reduced gauge metal
Solution Approach 2:
By creating localized variations in metal properties through arcuate strips, the patent establishes different flow characteristics in different regions. The strips act as flow guides that direct metal movement in predictable ways during forming operations, making the overall metal flow behavior reliable and controllable even though the overall gauge is reduced
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
This approach results in tabs with consistent strength, reduced kinks and wrinkles, and a smoother finish, allowing for the production of aesthetically appealing tabs from thinner metal stock while improving the overall rigidity and usability of the tabs.
Implementation Method 1
The arcuate surface of the first tool is structured to wipe the peripheral surface of the tab over the second tool
Data Source
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AI summary
The invention generally relates to a tab used to open beer/beverage can ends and food can ends. The tab has one or more arcuate strips that are provided on a surface of the tab proximate to a peripheral surface of the tab wherein the one or more arcuate strips have been formed further into a preselected portion of curled or hemmed portions of the tab. Tooling for the manufacture of the tab is also provided. A method for manufacturing the tab is additionally provided as well.