Vacuum Release Button for Sheet Metal Food Container Lid
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Solution Overview
Problem
Existing vacuum food container lids require significant torque for removal and lack a clear tamper-proof indication of vacuum release, posing challenges in ease of use and ensuring food freshness.
Innovation Solution
A sheet metal lid with a vacuum release button is designed, featuring a dome-shaped vent button and progressive die tooling to minimize metal thickness and incorporate a bonded sealant that separates upon button depression, recontacting to maintain freshness and indicate vacuum release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum sealed lid is used for a food container, then food freshness is maintained, but significant torque is required for lid removal
Solution Approach 1:
The lid is segmented into a main lid body and a separate vacuum release button component. The button can be depressed to create a vent hole, allowing air to enter and equalize pressure between the interior and exterior of the container, thereby reducing the vacuum seal strength and enabling easier lid removal without compromising the integrity of the main sealing mechanism.
Solution Approach 2:
A vent hole is introduced as an intermediary element between the sealed interior and exterior environments. This vent hole acts as a mediator that allows controlled pressure equalization, transforming the strong vacuum seal into a weaker seal that can be easily broken for lid removal while maintaining food freshness during storage.
2Ease of operation
If vacuum release is implemented, then lid removal is facilitated, but clear tamper-proof indication of vacuum release is lost
Solution Approach 1:
The lid incorporates a color-changing indicator mechanism that visually signals when the vacuum seal has been compromised or released. This may involve color-changing materials or mechanical indicators that change position or appearance when the vacuum is released, providing clear tamper-proof indication while still allowing facilitated lid removal.
Solution Approach 2:
The lid system includes visual feedback mechanisms that immediately indicate when the vacuum seal status has changed. This feedback through color changes or mechanical indicators ensures consumers can detect tampering or vacuum release, maintaining information integrity while preserving the ease of legitimate lid removal when needed.
3Ease of operation
If a vacuum release button is added to the lid, then ease of lid removal is improved, but lid thickness increases
Solution Approach 1:
The vacuum release button is designed as a nested structure that fits within the existing lid profile. The button mechanism is compact and integrated into the lid body, with components nested within each other to minimize the overall increase in lid thickness while still providing the necessary functionality for vacuum release and ease of lid removal.
Solution Approach 2:
The button and its housing are designed using thin-walled structures and flexible materials that provide the necessary mechanical functionality with minimal thickness. This allows the vacuum release mechanism to be integrated into the lid without significantly increasing the overall lid thickness, maintaining a sleek and compact design.
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
Facilitates easy lid removal by reducing torque requirements and provides a clear visual indication of vacuum release, ensuring food freshness and safety.
Implementation Method 1
An arcuate score line is formed within the lid adjacent the bottom of the arcuate wall portion, and the score line may be progressively deeper from the center of the arcuate score line to the opposite ends of the score line
Implementation Method 2
the configuration of the button prevents the finger depressing the button from engaging the sheared sheet metal edge of the lid at the score line
Implementation Method 3
A curved or arcuate reinforcing bead is formed within the cavity at the lower end of the sloping top wall and in opposing relation to the arcuate vertical wall portion. When the button is released, the sealant recontacts due to spring hinge action of the reinforced opposite side of the button
Data Source
AI summary
A sheet metal lid has a rim portion with a resilient sealant for releasably coupling and sealing the lid to a glass or other container enclosing a vacuum food product. The lid is successively pressed with progressive dies to form an upwardly projecting and thinner dome-shape portion which is progressively formed into annular cavity surrounding a vacuum release vent button. The button has a sloping top wall with an upper edge portion connected to a substantially vertical arcuate wall portion adjacent an arcuate score line located in opposing relation to an arcuate reinforcing bead within the cavity. A sealant material is bonded to the inner surface of the button and overlies the score line. The vent button is preferably located below the rim both before and after the vacuum is released, and the sealant material reseats to cover the score line and protect the food product.