End Cap Score Line Geometry for Controlled Flap Opening
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Solution Overview
Problem
Containers with flaps under high pressure tend to open undesirably, often lifting outwardly instead of downwardly, causing inefficiencies in dispensing contents.
Innovation Solution
An end cap design featuring a main score line that extends from one side of the rivet opening to another without intersecting or extending significantly beyond a tangent line at the bottom, combined with an anti-fracture score line parallel to it, and a control score line to manage tearing, ensuring the flap pivots downwardly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flap is designed to open under high pressure, then the container can dispense contents, but the flap opens upwardly/outwardly instead of downwardly/inwardly
Solution Approach 1:
The score line is pre-formed in the end cap body at a specific angle and position relative to the rivet opening, creating a predetermined tear path that guides the flap to open downwardly/inwardly. This preliminary structural preparation ensures the flap follows the desired opening direction even when subjected to high internal pressure, resolving the contradiction between enabling flap opening and maintaining controlled opening direction.
2Force
If the score line extends further from the rivet opening, then the flap has more leverage, but the flap is more prone to upward deflection under pressure
Solution Approach 1:
The score line is designed with specific geometric parameters: it extends from the rivet opening at a controlled angle and terminates before intersecting the tangent line at the bottom of the rivet opening. This precise parameter control optimizes the leverage force while preventing upward deflection, as the score line length and angle are carefully calibrated to balance the competing forces during flap opening.
3Ease of operation
If the main score line intersects the tangent line at the bottom of the rivet opening, then the flap can pivot more freely, but upward deflection is encouraged
Solution Approach 1:
The design deliberately excludes the score line from intersecting the tangent line at the bottom of the rivet opening. By extracting or removing this intersection point, the structure prevents the score line from creating upward deflection paths, while still allowing sufficient pivoting motion through the controlled extension of the score line from the rivet opening.
Data Source
AI summary
An assembly including an end cap having an end cap body having a rivet opening, a tab having a rivet opening, and a rivet extending through the rivet opening of the end cap body and the rivet opening of the tab, thereby coupling the tab to the end cap body. The end cap further includes a main score line formed in the end cap body and defining a flap. The main score line is configured to be torn along its length in a downstream direction to enable the flap to pivot about a hinge area. The main score line extends from a first side of at least one of the rivet openings to a second side of the at least one of the rivet openings in the downstream direction. A portion of the main score line, located on the second side of the at least one rivet opening, does not intersect a tangent line located at a bottom of the at least one rivet opening, or does not extend upwardly beyond the tangent line by more than 3/1000″.