Microwavable Lid Venting and Handle Structure for Safe Steam Release
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Solution Overview
Problem
Existing microwavable containers with flimsy lids face issues such as localized steam venting that can cause discomfort, lid breakage from impact or prolonged use, and incompatibility with top loading due to lightweight construction, leading to potential damage and limited usability.
Innovation Solution
A microwavable lidded container design featuring a lid with outwardly and upwardly flared edges acting as handles, a toggle or rocker vent, and a peripheral seal that allows for simultaneous and evenly distributed pressure equalization between the lid and container base, preventing steam from directly impinging on the user's fingers and ensuring the lid can be removed without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin-walled flexible lid is used to allow peeling removal, then ease of operation is improved, but localized steam venting causes discomfort or harm to the user
Solution Approach 1:
The lifting surfaces are positioned in a third dimension above the sealing plane, allowing fingers to engage and lift the lid from a location that is spatially separated from the steam venting path at the sealing interface. This vertical dimensioning of the outstands places the user's fingers above the zone where steam is generated and escapes, eliminating direct exposure while maintaining easy lid removal through the flared lifting surfaces.
2Ease of manufacture
If a lightweight lid is used to reduce material usage, then manufacturing cost is reduced, but the lid becomes prone to breakage from impact or prolonged use
Solution Approach 1:
The lid is constructed from a blended plastic material that combines the flexibility and microwave compatibility of polyethylene with the strength and rigidity of polypropylene. This composite material formulation allows the lid to remain lightweight and easy to manufacture while simultaneously achieving the durability needed to resist impact damage and prolonged use degradation.
3Productivity
If a thin-walled lid is used to reduce weight, then productivity is improved, but the lid cannot withstand top loading conditions
Solution Approach 1:
The blended plastic material provides sufficient structural strength to withstand top-loading conditions where multiple containers are stacked, while maintaining the thin-walled construction that enables efficient manufacturing and reduced material usage. The polypropylene component specifically contributes the rigidity needed for impact resistance.
4Ease of operation
If localized steam venting is used to allow gradual deseating, then ease of operation is improved, but steam flows rapidly and loses heat before dispersal
Solution Approach 1:
The lifting surfaces are positioned at multiple locations around the periphery of the lid, allowing the user to distribute the lifting force across several engagement points. This segmentation of the lifting action enables gradual deseating of the lid from the container while maintaining control over the opening process, preventing sudden steam release.
Data Source
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AI summary
A microwavable lidded container assembly comprising a container base having peripheral walls and an open top, a lid able to seat and thereby close the container base at the open top to define an enclosure; characterised in that the lid has a closable vent and the lid has a body adapted to carry a near peripheral seal to be interposed between a downward facing shoulder or plateau of the lid onto the top of a peripheral wall of the base container yet to have outstands at opposed perimeter regions of the lid to act as handle pairs for lifting the lid relative to the container base to deseat the lid therefrom.