Molded Fiber Food Container Locking Interface for Moisture Control
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Solution Overview
Problem
Existing food containers made from organic materials like molded fiber suffer from moisture-related issues, leading to soggy food and potential leakage or failure, especially at the interface between the tray and lid, which can separate during transport.
Innovation Solution
A molded fiber container design featuring a tray and lid with specific structural elements such as parapets, build-ups, and ridges that form a locking interface around the perimeter, along with a sawtooth bottom surface and perimeter moat to reduce moisture contact and enhance airflow, ensuring secure closure and moisture management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the container uses a simple interface between lid and tray, then the container is easy to manufacture and assemble, but the interface may fail or separate during transport leading to leakage
Solution Approach 1:
The lid build-up is nested within the tray gap, creating an interlocking interface where the lid build-up fits into the space between the tray parapet and tray rest. This nesting configuration provides mechanical interlocking that prevents separation during transport while maintaining manufacturability through integrated molding of the fiber components.
Solution Approach 2:
The interface design extends into the vertical dimension by creating a gap structure with parapet, build-up, and rest elements that stack vertically. This multi-dimensional approach transforms a simple planar interface into a three-dimensional interlocking system that enhances reliability without significantly complicating manufacturing.
2Adaptability or versatility
If the container uses molded fiber material, then the container is compostable and environmentally friendly, but the food may become soggy due to excess moisture and the container may leak or fail
Solution Approach 1:
The bottom surface is segmented into a sawtooth pattern with multiple peaks and valleys, creating a textured surface that reduces contact area between food and container. This segmentation allows moisture to collect in the valleys rather than pooling against the food, maintaining compostability while improving moisture management.
Solution Approach 2:
The container incorporates a perimeter moat that creates a localized moisture collection zone around the edge, separating moisture from the food storage area. This local quality change allows the bulk of the container to remain simple molded fiber while providing targeted moisture management where it is most needed.
3Reliability
If the container uses a locking interface with build-ups and parapets, then the structural integrity and moisture management are improved, but the device complexity increases
Solution Approach 1:
The locking interface components (parapet, build-up, rest) are merged into integrated molded fiber structures rather than separate parts. The tray build-up and lid build-up are formed as single pieces with their respective mounting features, reducing assembly complexity while maintaining the interlocking mechanical function for enhanced structural integrity.
Data Source
AI summary
A container includes a molded fiber tray at least partially defining a tray internal volume. The tray includes a perimeter wall extending upward from a bottom tray surface, a rest extending outward from the perimeter wall, a parapet extending upward from the rest, and a tray build-up projecting inward from the parapet. The tray build-up and the rest at least partially define a gap therebetween. The container includes a molded fiber lid at least partially defining a lid internal volume. The lid includes a perimeter wall extending downward from a lid upper surface, and a ridge extending downward from the perimeter wall. The ridge includes an outer ridge wall, a lateral surface extending inward from the outer ridge wall, and a lid build-up projecting outward from the outer ridge wall. The lid build-up is configured to be received in the gap when the container is in a closed condition.