Circular Pressware Container Flanges for Venting and Stacking
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Solution Overview
Problem
Existing circular food containers are inefficient, prone to deterioration when holding heated food, and have manufacturing challenges, with rectangular pizza boxes wasting material and not stacking well.
Innovation Solution
A pressware product with interchangeable top and bottom pieces featuring flanges, slots, and flaps for secure coupling, along with a forming tool and system using positive and negative mold assemblies to efficiently produce these containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If circular food containers are used, then material waste is reduced compared to rectangular containers, but the containers slide against one another and do not stack well
Solution Approach 1:
The container is divided into a body portion and a separate lid portion, each with complementary stacking features. The body portion has an outwardly extending flange while the lid has an inwardly extending flange, allowing them to interlock when stacked. This segmentation allows optimization of each part's stacking characteristics independently while maintaining the overall circular shape for reduced material waste.
Solution Approach 2:
The lid portion is designed to nest within the body portion when stacked, with the inwardly extending lid flange fitting over the outwardly extending body flange. This nesting arrangement creates a stable stacked configuration while maintaining the circular footprint that minimizes material usage compared to rectangular containers.
2Shape
If circular containers are shaped similar to the food held within, then food fit is improved, but there is limited space in the containers and heat and steam break down the structure when enclosing heated food
Solution Approach 1:
The container is segmented into a body portion and a lid portion that can be separately optimized. The body portion maintains the circular shape for good food fit, while the lid portion incorporates ventilation features and can be designed with different structural characteristics to handle thermal stress independently.
Solution Approach 2:
Ventilation features are extracted as separate elements (vents or channels) within the lid portion, allowing the container to release heat and steam while maintaining the circular shape for food fit. This extraction of the ventilation function from the basic container structure prevents structural breakdown under heat while preserving the beneficial circular geometry.
3Device complexity
If existing circular container manufacturing methods are used, then production is simplified, but manufacturing efficiency is low
Solution Approach 1:
The manufacturing process is segmented into separate forming operations for the body portion and lid portion, allowing each to be manufactured independently using optimized processes. This segmentation enables parallel production and facilitates the use of specialized forming tools for each component, improving overall manufacturing efficiency while keeping individual process steps relatively simple.
Solution Approach 2:
The container design uses standardized features (flanges, slots, flaps) that can be manufactured using the same basic processes for both body and lid portions. This universality allows a single set of manufacturing capabilities to produce both components efficiently, improving productivity without significantly increasing device complexity.
4Productivity
If top and bottom pieces are made identical for interchangeability, then production efficiency is improved, but coupling mechanisms must be designed to work in both orientations
Solution Approach 1:
The coupling mechanism is segmented into complementary features: outwardly extending flanges with slots on one piece and inwardly extending flanges with corresponding engagement features on the other piece. This segmentation allows identical pieces to couple together in either orientation, achieving interchangeability and production efficiency while keeping the coupling design relatively simple through modular feature distribution.
Data Source
AI summary
A pressware product includes a top piece and a bottom piece. The top piece includes a planar central portion, a sidewall extending from the central planar portion, and a flange extending horizontally from the sidewall. The flange includes a slot and a radially extending top groove. The bottom piece cooperatively defines an inner space with the top piece. The bottom piece includes a planar central portion, a sidewall extending from the central planar portion, and a flange extending horizontally from the sidewall. The flange includes a locking flap configured to engage the slot of the top piece and a radially extending bottom groove. The radially extending bottom groove cooperatively defines a channel with the top groove so that the channel is in fluid communication with the inner space.