Micro-channel Gas Control for Package Pressure and Oxygen Infiltration
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Solution Overview
Problem
Existing pressure relief devices for packaged goods, such as coffee and produce, fail to effectively control gas flow and oxygen levels, leading to spoilage and quality deterioration due to indiscriminate gas transfer and oxygen creep, which limits the shelf life and results in significant food waste.
Innovation Solution
The development of micro-channels in packaging films that control the flow rate of CO2 and oxygen transmission rate by adjusting the channel's cross-sectional area and length, allowing selective gas flow based on the specific requirements of the packaged goods, ensuring a balanced CO2/O2 ratio and maintaining a stable internal environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional pressure relief valves are used, then pressure buildup is relieved, but oxygen enters the package causing spoilage
Solution Approach 1:
The patent employs a microporous membrane with precisely controlled pore sizes that allow CO2 molecules to pass through while blocking larger oxygen molecules. This selective permeability enables pressure relief without oxygen infiltration, directly resolving the contradiction between pressure relief and oxygen exclusion.
Solution Approach 2:
The membrane incorporates regions with different pore sizes and gas permeability characteristics tailored to specific locations. Areas with higher CO2 generation rates use more permeable regions, while areas sensitive to oxygen use tighter sealing regions, optimizing both pressure relief and oxygen exclusion locally.
2Stress or pressure
If micro-perforations are used for gas control, then pressure is relieved, but oxygen transmission cannot be sufficiently controlled
Solution Approach 1:
The patent systematically varies critical parameters including pore diameter (0.01-10 micrometers), porosity (10-50%), membrane thickness (1-100 micrometers), and material composition to precisely control gas transmission rates. This parametric optimization enables independent control of CO2 effusion and O2 ingress, achieving superior gas flow control precision.
Solution Approach 2:
The membrane utilizes composite structures combining multiple polymer layers with different gas permeability properties, such as hydrophobic polymers for water vapor control and oxygen-barrier polymers for oxygen exclusion. This composite approach enables simultaneous control of multiple gas species with high precision.
3Stress or pressure
If one-way valves are used, then CO2 can escape, but aromatic compounds are also lost
Solution Approach 1:
The microporous membrane's pore size distribution is engineered to exploit differences in molecular dimensions and diffusion characteristics. CO2 molecules (smaller kinetic diameter) pass through readily, while larger aromatic compound molecules are sterically hindered, enabling selective gas separation that preserves aromatic content while relieving pressure.
Solution Approach 2:
The membrane parameters including pore size, porosity, and thickness are optimized to create a size-exclusion effect that discriminates between CO2 and aromatic compounds. By controlling the pore diameter to be larger than CO2 molecules but smaller than aromatic molecules, the system achieves selective permeability that maintains aromatic integrity.
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
This solution extends the shelf life of packaged goods by precisely regulating gas flow, reducing oxygen infiltration, and preventing spoilage, while maintaining the quality of aromatic compounds, thereby minimizing food waste and improving handling and shipping efficiency.
Implementation Method 1
control the rate of flow of CO2 (cc/min @ 1PSI) from the inside of the package to the outside of the package
Implementation Method 2
control the oxygen transmission rate (cc/day/Atm) from the outside of the package to the inside of the package
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A device for controlling package pressure and gas flow for a packaged good comprises a film having a first opening for exposure to the inside of a package and a second opening for exposure to the outside of a package. A channel extends between the first opening and the second opening. The dimensions of the channel are configured to control the rate of flow of CO2 (cc/min @ 1PSI) from the inside of the package to the outside of the package and control the oxygen transmission rate (cc/day/Atm) from the outside of the package to the inside of the package so that a flow of CO2/OTR ratio is at an acceptable level for the packaged good.