Rotatable Tab End Closure with Secondary Vent Opening
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Solution Overview
Problem
Conventional beverage container end closures suffer from low, inconsistent, and uneven flow rates due to lack of consideration for inward air flow, which affects the pourability of contents.
Innovation Solution
The design incorporates a primary opening portion and at least one secondary opening portion that can be selectively opened using a rotatable tab, allowing for improved flow characteristics by increasing the opened area and facilitating air intake, with features like transition zones and rotational limiting means to control the opening mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single opening area is provided in the end closure, then the structure is simple, but the flow rate is low, inconsistent, and uneven
Solution Approach 1:
The end closure is divided into multiple functional opening areas: a primary opening area for product discharge and one or more secondary vent opening areas for air intake. This segmentation allows simultaneous product flow and air inflow, resolving the contradiction by improving flow rate consistency without requiring a completely complex new structure.
Solution Approach 2:
The invention adds a dimensional aspect to the opening system by introducing secondary vent openings at different locations and orientations on the end closure. This multi-dimensional approach to openings enables air to enter from different directions while product exits through the primary opening, improving overall flow characteristics.
2Ease of operation
If a single opening area is used, then the device is simple to operate, but pourability is poor with low and inconsistent flow rates
Solution Approach 1:
The pull tab mechanism is designed to serve multiple functions: it can open the primary opening area for product dispensing, and by rotating to different positions, it can also open secondary vent opening areas for air intake. This multi-functionality improves pourability without requiring multiple separate operating mechanisms.
Solution Approach 2:
The pull tab is designed to be rotatable about the rivet axis, allowing dynamic repositioning between different opening areas. This dynamic capability enables the user to select the appropriate opening configuration (primary only, or primary plus secondary vents) based on pouring needs, improving flow rate consistency.
3Productivity
If multiple opening areas are added to improve flow rate, then pourability increases, but the opening mechanism becomes more complex
Solution Approach 1:
A single pull tab mechanism performs multiple opening functions by rotating to different positions. The same tab that opens the primary opening can, when rotated 90-180 degrees, open secondary vent openings. This universal mechanism avoids the need for separate actuators for each opening area.
Solution Approach 2:
The pull tab mechanism automatically opens the appropriate opening areas based on its position. When pulled upward, it opens the primary opening; when rotated and pulled, it opens secondary vents. The mechanism serves itself by using the same user input (pulling the tab) to activate different opening functions without requiring additional controls.
4Adaptability or versatility
If the pull tab can rotate freely, then it can access multiple opening areas, but uncontrolled rotation may cause unintended opening
Solution Approach 1:
Rotational limiting features are pre-positioned on the end closure structure to define specific stop positions for the pull tab. These limits are built into the design to prevent over-rotation and ensure the tab only opens intended opening areas when positioned correctly, maintaining reliable controlled opening.
Solution Approach 2:
Rotational limiting features act as intermediaries between the freely rotating pull tab and the opening mechanism. These features mediate the rotation by providing physical stops at predetermined angles, allowing the tab to access multiple opening areas while preventing unintended opening through controlled rotational boundaries.
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C~3D
AI summary
The present invention relates to an opening device for a beverage container. More specifically, the invention relates to a metal end closure having a primary opening area and at least one optional secondary vent opening which can be opened with the same pull tab. The primary opening area and the secondary vent opening area are defined by a score line which is interrupted by a check slot to inhibit propagation of a fracture along the score line.