Reclosable End Closure With Progressive Lever Debonding
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Solution Overview
Problem
Existing 'Stay on Tab' (SOT) closures for cans do not allow for reclosing after opening, as the score line break deforms the panel irreversibly, leading to potential spillage and contamination.
Innovation Solution
A closure system with a movable interior panel bonded to the end panel, featuring a rotatable lever that progressively debonds the bond perimeter, allowing for reclosure and incorporating mechanisms for efficient debonding, latching, and venting to enhance user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a score line break mechanism is used for easy opening, then opening convenience is improved, but reclosing capability deteriorates due to irreversible panel deformation
Solution Approach 1:
The closure system is divided into separate functional components: an interior panel bonded to the end panel, a distinct lever mechanism, and a bonding interface. This segmentation allows the lever to debond the interior panel from the end panel progressively, enabling both easy opening through lever actuation and reclosing by re-bonding the separated panels without permanent deformation
Solution Approach 2:
The bonding interface between the interior panel and end panel is designed to be dynamically controllable - initially bonded to maintain seal integrity, then progressively debonded by lever application, and finally capable of reclosing. This dynamic bonding state transition enables the closure to adapt between sealed and opened states reversibly, resolving the contradiction between easy opening and reclosing capability
2Adaptability or versatility
If a rotatable lever mechanism is introduced for progressive debonding, then reclosing capability is improved, but device complexity increases
Solution Approach 1:
The rotatable lever mechanism serves multiple functions: it applies progressive debonding force to separate the interior panel, provides mechanical advantage for easy opening, and enables reclosing through reversible actuation. This multi-functionality reduces the need for separate mechanisms for each operation, thereby limiting the increase in overall device complexity while achieving reclosing capability
Solution Approach 2:
The lever mechanism utilizes the user's applied force directly to perform the debonding and opening actions without requiring additional power sources, motors, or complex actuation systems. The mechanical advantage provided by the lever's rotation and geometry allows the system to self-service the opening and reclosing functions through simple manual operation, minimizing added complexity
3Reliability
If the interior panel is initially bonded to the end panel, then seal integrity is improved, but opening force requirement increases
Solution Approach 1:
The lever mechanism applies force progressively along the bonding interface rather than attempting to break the entire bond simultaneously. By engaging the interior panel at specific points and progressively debonding along the bond perimeter through lever rotation, the system reduces the peak force requirement compared to breaking a complete perimeter bond at once, while still achieving reliable seal integrity through the initial bonded state
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
Enables easy opening and reclosing of containers, reduces spillage, and provides smoother pouring characteristics by maintaining a pressure equilibration venting channel.
Implementation Method 1
a moveable tool used to facilitate easy opening and progressive debonding of the interior panel from the end panel... a user applies force to the rotating lever to move it axially around an attachment point to progressively debond a substantial portion of the bond perimeter
Implementation Method 2
the interior panel may also reclose and either partially or entirely seal the aperture... bonded around its perimeter to the end panel by heat-sealing
Data Source
Figure 1
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Figure 4
AI summary
An easy-opening end closure that may also be reclosed, suitable for joining to a container. A cover panel is bonded around its perimeter to an end panel with a rotatable lever interposed between them. To open the closure, a user applies force to the rotating lever to move it axially around an attachment point thereby engaging integrated mechanisms to progressively debond segments of the perimeter seal.