Temperature-Responsive Breathable Membrane for Produce Packaging
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Solution Overview
Problem
Current packaging systems for produce, particularly avocados, lack sensitivity and accuracy in controlling ripening, leading to premature ripening and increased waste during storage and display.
Innovation Solution
A produce tray system featuring a molded, solid construction with a flexible film and a breathable membrane that adjusts gas transmission rates based on temperature, creating a controlled atmosphere with higher CO2 and lower O2 levels to slow down ripening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional sealed packaging is used for produce, then storage simplicity is improved, but ripening control accuracy deteriorates
Solution Approach 1:
The packaging system dynamically changes gas transmission parameters through temperature-responsive membranes. The membrane's gas permeability automatically adjusts based on temperature fluctuations, allowing the package to maintain optimal ripening conditions without complex active control systems. This resolves the contradiction by achieving accurate ripening control through passive parameter adaptation rather than simple sealing.
Solution Approach 2:
The packaging membrane performs self-regulation of gas exchange based on temperature conditions. When temperature rises, the membrane automatically increases CO2 transmission and decreases O2 transmission to slow ripening. This self-service mechanism eliminates the need for external monitoring or active control systems, maintaining both storage simplicity and ripening control accuracy.
2Use of energy by stationary object
If higher temperature storage is used, then energy consumption is reduced, but ripening rate increases
Solution Approach 1:
The temperature-responsive membrane changes its gas transmission parameters in response to temperature increases. As storage temperature rises, the membrane automatically adjusts to transmit more CO2 and less O2, creating a modified atmosphere that counteracts the accelerated ripening caused by higher temperatures. This allows energy-efficient warm storage without sacrificing ripening control.
Solution Approach 2:
The breathable membrane acts as an intermediary between the produce and the storage environment. It mediates the effect of temperature on ripening by selectively transmitting gases based on temperature conditions, thereby decoupling the direct relationship between temperature increase and ripening acceleration.
3Duration of action of stationary object
If CO2 transmission rate is increased, then ripening is slowed down, but O2 availability for respiration is reduced
Solution Approach 1:
The membrane's gas transmission parameters are dynamically linked to temperature. At higher temperatures when ripening acceleration is a concern, the membrane automatically increases CO2 transmission and decreases O2 transmission. This coordinated parameter change ensures that O2 restriction and CO2 enrichment occur together in the right proportions to slow ripening without causing anaerobic conditions.
Solution Approach 2:
The membrane provides different gas transmission properties for different gases (CO2 vs. O2) in response to temperature changes. It selectively restricts O2 while permitting CO2 transmission at elevated temperatures, creating locally optimized gas composition within the package to extend shelf life while maintaining adequate respiration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively extends the shelf life of avocados by slowing down ripening, especially at higher temperatures, by maintaining a desired gas composition within the package, reducing waste and ensuring longer freshness for consumers.
Implementation Method 1
A flexible film attached across the upper lip, the film being configured to permit passage of water vapor
Implementation Method 2
a breathable membrane is adhered across the aperture, the membrane having a structure which lower the rate of CO2 transmission relative to O2 transmission for higher temperatures
Implementation Method 3
the membrane having a structure which lower the rate of CO2 transmission relative to O2 transmission for higher temperatures
Data Source
AI summary
A system and method for storing, shipping, preserving and ripening produce. Packaging of respiring produce, particularly avocados, in sealed tray systems. The tray systems include a lower bowl-shaped tray having an upper lip to which a flexible film is adhered. The flexible film has an aperture covered by a breathable membrane. The film permits passage of water vapor to reduce the chance of mold formation during packaging and shipping. The breathable membrane controls gaseous exchange at different temperatures and has pores that open above the threshold temperature. The breathable membrane alters the O2 and CO2 within the tray above the threshold temperature, thus slowing up the ripening process at elevated temperatures.