Plastic Egg Carton Mating Posts for Jumbo Size Accommodation
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Solution Overview
Problem
Existing egg cartons, both pulp and plastic, face issues with dimensional stability and egg protection under mechanical forces and environmental changes during handling and transport, leading to egg breakage and handling difficulties.
Innovation Solution
A plastic egg carton design featuring mating cell and lid posts with planar ramp surfaces at the intersection of adjacent cells, enhancing compressive strength and resistance to side impacts, allowing it to accommodate larger eggs within a standard footprint without increasing the carton's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible walls are used between cell pockets to protect eggs, then egg protection is improved, but the carton becomes vulnerable to compressive and lateral impact forces during handling and stacking
Solution Approach 1:
The carton structure is segmented into rigid cell pockets formed by vertical partitions extending from the base to the lid, creating discrete compartments that maintain structural integrity. Each cell is independently defined by these rigid walls, providing both egg protection and resistance to external forces through the segmented rigid framework.
Solution Approach 2:
The carton employs a composite structure combining rigid vertical partition walls with the base and lid, creating a hybrid system that leverages the strength of rigid elements for structural support while maintaining the protective function for eggs. This composite approach allows the carton to withstand compressive and lateral forces better than purely flexible designs.
2Stability of the object's composition
If pulp cartons are made stiff and rigid when dry, then structural stability is improved, but they become soggy and lose dimensional stability when exposed to humidity changes
Solution Approach 1:
The material parameter is changed from pulp (paper) to plastic, fundamentally altering the material's response to humidity. Plastic maintains consistent dimensional stability and rigidity across varying humidity conditions, eliminating the soggy problem that affects pulp cartons while retaining the desired structural stability.
Solution Approach 2:
The plastic material used in the carton provides inherent resistance to moisture while maintaining structural integrity. This material choice creates a composite-like performance where the plastic structure combines rigidity with moisture resistance, solving both dimensional stability and humidity-related reliability issues simultaneously.
3Strength
If the lid is made with stiff locking flaps and hinges, then structural strength is improved, but closing and handling become difficult and the lid does not line up with the base tray
Solution Approach 1:
The hinge connection between the lid and base tray is designed to be flexible and movable, allowing the lid to dynamically adjust during closing operations. This dynamic hinge mechanism enables easy closing and handling while maintaining proper alignment between the lid and base tray, contrasting with stiff locking flaps that prevent such adjustments.
4Adaptability or versatility
If the carton footprint is increased to accommodate jumbo eggs, then egg size capacity is improved, but material costs and transport efficiency decrease
Solution Approach 1:
The cell pocket dimensions are modified to increase egg capacity while maintaining the standard carton footprint. By adjusting the parameters of the cell size and configuration rather than expanding the overall footprint, the carton can accommodate larger eggs without increasing material usage or reducing transport efficiency.
Solution Approach 2:
Instead of increasing the footprint (horizontal dimension), the design optimizes the vertical dimension and internal cell configuration to accommodate larger eggs. This dimensional approach allows jumbo eggs to fit within the existing footprint by utilizing vertical space and reconfiguring cell geometry rather than expanding the carton's external dimensions.
Data Source
AI summary
Plastic egg cartons having mating cell and lid posts for improved egg protection, and able to accommodate up to jumbo size eggs in a standard footprint. The carton has a base tray and hinged lid, the tray including a plurality of cells for receiving individual eggs, and the tray having a plurality of cell posts each formed at an intersection of four adjacent cells as an extension of the sidewalls of the four adjacent cells. Preferable, each cell post has four generally planar ramp surfaces, one disposed respectively on each of the four sidewall extensions. The lid has a plurality of lid posts for mating with the cell posts when the lid is in a closed position.