Rotatable Vent Cap With Frangible Deck For Liquid Containers
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Solution Overview
Problem
Existing vent structures for containers require pre-formed holes in the closure deck, compromising the integrity of the container and its contents, leading to potential leakage and lacking a tamper-evident feature.
Innovation Solution
A molded-in vent location with a recessed punch-out area and a rotatable vent cap that snaps into a molded retainer, allowing for alignment and partial separation without pre-forming holes, providing a tamper-evident feature and anti-glug functionality through a frangible border and detent mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-formed holes are used in the closure deck for venting, then the venting function is achieved, but the integrity of the container is compromised and leakage occurs
Solution Approach 1:
The vent hole is pre-formed as a frangible area that appears intact during shipping and storage, but is designed to be easily punched through by the consumer at the point of use. This preliminary preparation allows the container to maintain integrity during transport while enabling easy venting operation when needed.
Solution Approach 2:
The closure deck has different structural properties in different areas: the general deck structure is solid and impermeable to maintain integrity, while a specific localized area is designed as a frangible zone with reduced structural strength to allow easy punching. This local differentiation resolves the contradiction between overall integrity and localized venting capability.
2Reliability
If pre-formed holes are used in the closure deck, then venting is enabled, but tamper evidence is lost
Solution Approach 1:
The frangible area is designed with visual characteristics that change or reveal tampering status. When intact, the area appears as a solid surface matching the rest of the deck. When punched, the frangible material separates and creates a visible hole, providing clear visual evidence that the container has been opened or tampered with.
3Reliability
If a removable plug vent structure is used, then venting function is achieved, but the device complexity increases
Solution Approach 1:
The venting function is merged directly into the closure deck structure itself rather than being a separate removable component. The frangible area is an integral part of the molded closure, eliminating the need for separate plugs, caps, or moving parts. This integration simplifies the overall device while maintaining the venting function and integrity benefits.
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
Preserves container integrity by eliminating pre-formed holes, preventing leakage and providing a clear indication of tampering, while effectively preventing the 'glug' reaction during pouring.
Implementation Method 1
A radially offset hole in the cap can be aligned with the punch-out area to open the vent, after the punch-out section is partially removed. The hole in the cap is aligned with the punch-out area initially for the purpose of allowing the punch-out area to be partially separated from the deck without falling into the container
Implementation Method 2
The cover or cap can thereafter be rotated to an angular position wherein a detent structure protrudingly formed in the bottom surface of the cap fits into the recessed knock-out vent hole to provide a resilient detent force tending to hold the cap in a fully closed and sealed position
Data Source
AI summary
A re-closable vent for a container closure which requires no pre-formed holes in the closure deck, provides a tamper-evident feature, and provides simple rotation of a cap structure to open and a vent after punching out a frangible deck section.