Multilayer Flexible Packaging with Core-Shell Antioxidant Capsules
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Solution Overview
Problem
Existing methods for integrating antioxidants into packaging materials face limitations such as reduced effectiveness due to distance from the outer layer, instability at high temperatures, and incompatibility with polymers, leading to reduced antioxidant activity and limited applications.
Innovation Solution
A multilayered flexible package with core-shell antioxidant capsules, sized between 0.1 and 10 µm, encapsulated in a polymeric shell, dispersed in a polymeric coating, providing a 0.1 to 0.5 V reduction potential, enhances antioxidant protection and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If antioxidants are added as solid, liquid, oil, powder or emulsion into polymeric material during extrusion, then antioxidant species are integrated into the packaging material, but the layer thickness becomes at least 100-200 μm which reduces possible applications
Solution Approach 1:
The patent changes the physical state parameter of the antioxidant from bulk (solid/liquid) to nanoscale particles (1-100 nm), enabling integration into thin polymer layers while maintaining sufficient antioxidant quantity and activity
Solution Approach 2:
The patent uses thin polymeric films (can be less than 100 μm) containing nanoscale antioxidant particles, allowing the packaging to achieve both adequate antioxidant content and reduced thickness for various applications
2Quantity of substance
If antioxidants are placed deep within the polymer layer, then antioxidant species are integrated into the package structure, but the distance from the outer portion reduces antioxidant activity
Solution Approach 1:
The patent changes the size parameter of antioxidant particles to nanoscale (1-100 nm), enabling them to be uniformly distributed throughout the thin polymer layer and positioned close to the outer surface, thereby maintaining high antioxidant activity while ensuring deep integration
Solution Approach 2:
The patent creates a nanoscale dispersed system where antioxidant particles are distributed throughout the polymer matrix, creating a effectively porous structure at nanoscale that allows antioxidant molecules to reach the outer surface efficiently
3Ease of manufacture
If elevated temperatures are applied during extrusion process, then polymeric material is processed and formed, but antioxidant molecules undergo spoilage and degradation
Solution Approach 1:
The patent changes the size parameter of antioxidant particles to nanoscale (1-100 nm), which increases their surface area to volume ratio and enhances their stability against thermal degradation during processing while maintaining processing feasibility
Solution Approach 2:
The patent creates a composite material system where nanoscale antioxidant particles are dispersed in the polymer matrix, combining the processing properties of the polymer with the thermal stability and antioxidant properties of the nanoparticles
4Reliability
If specific antioxidant molecules such as catechines are integrated into polymer, then antioxidant protection is provided, but distribution and effectiveness are strictly related to chemical compatibility with the polymer
Solution Approach 1:
The patent changes the size parameter of antioxidant particles to nanoscale (1-100 nm), which improves their dispersion and compatibility with various polymer matrices regardless of the specific chemical nature of the antioxidant molecule, thereby increasing versatility across different polymer types
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 core-shell structure maintains antioxidant effectiveness by preventing degradation and ensures uniform distribution, extending the preservation time of air-sensitive materials.
Implementation Method 1
the oxidation process is considered the major cause of deterioration for perishable goods and foods affecting their quality and safety
Implementation Method 2
a core-shell system dispersion... comprising a core of an antioxidant with a reduction potential comprised between 0.1 and 0.5 V, and a polymeric shell covering the core at least by 70%
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
A multilayered flexible package comprises a polymeric coating (2) that contains a dispersion of antioxidant capsules (3) having a particle size distribution comprised between 0.1 and 10 µm and a core-shell structure comprising a core (4), of an antioxidant with a reduction potential comprised between 0.1 and 0.5 V, and a polymeric shell (5) covering the core (4) at least by 70%.