Thermoformed Plastic Egg Container Hinge Reinforcement
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Solution Overview
Problem
Existing egg containers, particularly those made of cardboard, often fail to properly close, leading to egg breakage during handling and transportation due to improper sealing, whereas thermoformed plastic containers lack sufficient reinforcement to securely hold eggs in place.
Innovation Solution
A container design featuring a base and cover portion made of polymer with a hinge system comprising longitudinal grooves and reinforcement walls, along with central reinforcement beams and an aeration unit, ensures secure closure and protection of eggs by using a thermoformed plastic sheet with specific structural features like fold lines and air passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cardboard is used for egg containers, then the container can be easily manufactured and is inexpensive, but the container fails to properly close and secure eggs, leading to egg breakage
Solution Approach 1:
The patent changes the material parameter from cardboard to thermoformed plastic, which fundamentally alters the mechanical properties including strength, rigidity, and closure reliability. This material substitution resolves the contradiction by maintaining ease of manufacture through thermoforming processes while dramatically improving the container's ability to securely close and protect eggs.
Solution Approach 2:
The patent employs a composite structure combining the thermoformed plastic container body with a separate closure lid that interlocks with the base. This composite design allows each component to be optimized independently - the base for egg support and the lid for secure closure - thereby achieving both ease of manufacture and high reliability in preventing egg breakage.
2Reliability
If thermoformed plastic is used for egg containers, then the container provides secure closure and protection, but the material lacks sufficient reinforcement to securely hold eggs in place
Solution Approach 1:
The patent divides the container into segmented components including the base portion with cavities, the cover portion, and reinforcement beams that are integrally formed but functionally distinct. These segments work together to provide both secure closure and structural reinforcement, with the reinforcement beams specifically adding strength to hold eggs firmly in place while the overall structure maintains reliability through proper closure mechanisms.
Solution Approach 2:
The patent adds dimensional complexity by incorporating reinforcement beams that extend vertically and horizontally within the container structure. These three-dimensional structural elements provide additional strength and rigidity to the thermoformed plastic material, enabling it to securely hold eggs in place while maintaining the closure reliability that thermoformed plastic inherently provides.
3Ease of operation
If the container is made transparent for egg visibility, then consumers can inspect eggs without opening the container, but the container structure becomes more complex to achieve proper sealing
Solution Approach 1:
The patent implements a self-sealing mechanism where the container's structural design automatically ensures proper closure through interlocking features between the base and cover portions. The reinforcement beams and geometric configuration create a self-locking effect that maintains sealing without requiring complex external fastening mechanisms, thereby preserving ease of operation through transparency while managing structural complexity through intelligent design.
Data Source
AI summary
A container for receiving frangible items comprises a sheet of polymer formed into a base portion having a plurality of item-receiving cavities for supporting frangible items. A cover portion has an item-covering concavity for covering the frangible items. A first hinge portion is positioned between a first longitudinal edge of the base portion and the cover portion for rotating the cover portion onto the base portion to hold the frangible items captive in the item-receiving cavities. The first hinge portion comprises a pair of longitudinal grooves formed into the first hinge portion and extending parallel to the first longitudinal edge of the base portion, with a web defined between the longitudinal grooves, and a hinge-reinforcement wall at at least one end of the longitudinal grooves. A fold line is formed in the web and in the hinge-reinforcement wall when the cover portion is rotated onto the base portion.