Overcap Venting via Flexure Portions and Retaining Ring
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Solution Overview
Problem
Easy-open containers with overcaps face challenges in venting pressure built up due to off-gassing products like ground coffee, leading to potential damage and spoilage, as existing solutions either flex the seal or position valves in ways that may interfere with the overcap during expansion.
Innovation Solution
The overcap design features a depending skirt with lugs and flexure portions, a retaining ring, and venting ribs that create a flow channel to allow pressure release without interfering with the overcap's engagement, ensuring effective venting and maintaining the seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible seal is provided on a rigid container for off-gassing products, then pressure venting is enabled, but the seal flexes and may compromise sealing integrity
Solution Approach 1:
The overcap is segmented into multiple functional zones: a rigid body portion maintaining seal integrity, a flexible skirt portion allowing pressure venting, and integrated lugs with flexure portions that enable controlled deformation. This segmentation allows different parts of the overcap to perform different functions simultaneously - the body maintains the seal while the skirt and lugs vent pressure.
Solution Approach 2:
The overcap incorporates dynamic elements including flexible skirt material that can deform under pressure, lugs with flexure portions that allow controlled bending, and a retaining ring with spacing ribs that create flow channels. These dynamic features enable the overcap to adapt to pressure changes while maintaining overall seal integrity.
2Reliability
If a valve is positioned on the flexible sealing material or membrane, then venting function is provided, but the valve may interfere with overcap expansion during off-gassing
Solution Approach 1:
The patent introduces an intermediary structure - the skirt with integrated lugs and flexure portions - that mediates between the rigid overcap body and the flexible sealing membrane. This intermediary allows the overcap to expand and vent pressure while the valve remains properly positioned on the membrane without direct interference.
Solution Approach 2:
The overcap design adds a vertical dimension with the depending skirt extending downward from the body portion. This vertical extension creates space for the valve to be positioned on the membrane below the overcap body, allowing the valve to function without interfering with the overcap's horizontal expansion during off-gassing.
3Reliability
If the overcap is designed with a tight seal to prevent spilling, then product protection is improved, but pressure venting becomes difficult
Solution Approach 1:
The overcap is divided into a rigid body portion that maintains the tight seal for product protection, and a flexible skirt portion with integrated venting pathways. The lugs with flexure portions create controlled deformation paths that allow pressure venting while the main body remains sealed.
Solution Approach 2:
Different portions of the overcap have different mechanical properties - the body portion is rigid to maintain the seal, while the skirt and lugs are flexible to allow pressure venting. This local differentiation of material properties enables simultaneous seal integrity and pressure release.
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
This design effectively vents pressure from within the container while maintaining the seal, preventing damage and spoilage by allowing for the release of built-up gases without compromising the overcap's fit or the product's freshness.
Implementation Method 1
A plurality of flexure portions are formed on the outer periphery of the body portion and located within the spaced intervals between adjacent lugs. The flexure portions are formed to flex within the body portion to a position that will release internal pressure from within the container body past the retaining ring and through the flow channel.
Data Source
AI summary
An overcap is provided for removably covering an access opening into the interior of a container. The opening in the container defines a peripheral rim and includes an outwardly projecting bead for releasably retaining the overcap. The overcap is defined by a body portion formed to cover the opening of the container and a depending skirt. The skirt extends from the bottom surface of the body portion for a distance sufficient to cover the projecting bead of the container rim. An inwardly directed retaining ring is formed on an inside surface of the skirt for engagement with the projecting bead on the container. A vent is formed within the retaining ring to define a flow path past the retaining ring. The vent may be a spacing rib formed on the inside surface of the skirt with one or more flow channels formed within the retaining ring.