Screw Cap Retention via Fracturable Safety Ring
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Solution Overview
Problem
Existing screw caps do not remain attached to containers after opening, requiring complex and expensive adaptations to bottling lines to comply with environmental regulations, and lack the safety benefits of screw caps.
Innovation Solution
A screw cap design featuring a cylindrical wall with a thread, a safety ring connected via a fracturable connection, and a strip with a hinge and connecting element that allows the cap to remain attached after unscrewing, preventing rotation and ensuring the cap stays with the container without needing significant modifications to bottling lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional screw cap is used, then the cap can be easily opened and closed, but the cap does not remain attached to the container after opening
Solution Approach 1:
The cap is divided into multiple functional segments: a removable cylindrical wall for opening/closing operations, and a retained safety ring with fracturable connection that maintains attachment to the container. This segmentation allows the cap to provide both easy opening/closing and post-opening retention.
Solution Approach 2:
The cap transitions from a static attached state to a dynamic state during opening, where the cylindrical wall can be removed while the safety ring remains attached through the fracturable connection. This dynamic behavior enables the cap to adapt between different operational phases.
2Reliability
If a friction cap is used to remain attached after opening, then the cap stays with the container, but it lacks the safety benefits of screw caps and requires complex bottling line adaptations
Solution Approach 1:
The cap combines multiple functions into a single device: it provides screw-threaded sealing for safe closure, incorporates a fracturable connection for post-opening retention, and maintains compatibility with existing screw cap bottling lines. This multi-functionality eliminates the need for separate retention mechanisms and line adaptations.
Solution Approach 2:
The fracturable connection automatically fractures during the first unscrewing operation to enable the cylindrical wall to be removed while the safety ring remains attached. This self-activating mechanism requires no additional actuators or complex control systems in the bottling line.
3Reliability
If a screw cap with retention mechanism is designed, then the cap remains attached after opening, but the structural complexity of the cap increases
Solution Approach 1:
The safety ring is nested within the cylindrical wall structure during the closed state, with the fracturable connection integrated into the wall thickness. Upon opening, the connection fractures and the safety ring becomes the retained element, providing retention without adding external complexity.
Solution Approach 2:
The fracturable connection is designed as a thin, flexible region within the cap structure that can fracture cleanly under opening forces. This flexible element provides the retention function without requiring rigid, complex mechanical components.
Data Source
AI summary
A screw cap intended to remain attached to a container after opening the container. The cap includes a cylindrical wall having an inner surface including a thread arranged to engage with a thread arranged on a neck of the container, a safety ring extending the cylindrical wall and connected to the cylindrical wall by at least one fracturable connection. A portion of the cylindrical wall forms a strip connected to the safety ring by way of a connecting element arranged to make it possible to displace the cylindrical wall during the unscrewing of the cylindrical wall.