Multilayer Packaging with Wax and PVOH Oxygen Barrier
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Solution Overview
Problem
Commercially established multilayer packaging materials for high-barrier food applications are non-biodegradable and pose challenges to recycling systems, contributing to microplastic pollution in natural ecosystems due to their inability to be recycled.
Innovation Solution
A multilayer packaging system comprising a water-soluble polymer layer with an oxygen barrier, a wax layer providing a water vapor and humidity barrier, and another water-soluble polymer layer, which is bio-degradable and compostable, allowing for recyclability and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multilayer packaging materials are used to achieve high barrier properties, then oxygen and water vapor barrier performance is improved, but biodegradability deteriorates and recycling becomes difficult
Solution Approach 1:
The patent employs a composite multilayer structure consisting of a cellulose base layer, a PVOH intermediate layer, and a wax barrier layer. Each layer contributes specific properties: the cellulose layer provides structural integrity, the PVOH layer offers oxygen barrier properties and adhesion, and the wax layer delivers water vapor barrier performance. This composite approach achieves high barrier performance while maintaining biodegradability of all components, resolving the contradiction between reliability and environmental harm.
2Reliability
If non-biodegradable polymers are used in multilayer systems, then barrier requirements for food packaging are met, but recyclability deteriorates and ecosystem pollution increases
Solution Approach 1:
The patent changes the material parameters from conventional non-biodegradable polymers to biodegradable alternatives with specific properties. The PVOH layer is selected for its high oxygen barrier performance and water solubility, while the wax layer provides water vapor barrier. These parameter changes enable the packaging to meet barrier requirements while being adaptable to recycling and composting systems, resolving the contradiction between reliability and adaptability.
3Object-generated harmful factors
If water-soluble polymers are used to improve biodegradability, then environmental compatibility is improved, but barrier performance may deteriorate
Solution Approach 1:
The patent uses a composite structure where the PVOH water-soluble layer provides oxygen barrier properties and adhesion to the cellulose base, while the hydrophobic wax layer provides water vapor barrier. The synergistic combination of these materials with different properties achieves both environmental compatibility through water solubility and biodegradability, and reliable barrier performance against both oxygen and water vapor.
4Reliability
If multilayer structures with multiple functional layers are created, then barrier performance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific functions to specific layers: the cellulose base layer provides structural support and porosity control, the PVOH intermediate layer provides oxygen barrier and adhesion, and the wax top layer provides water vapor barrier. This functional differentiation at the local layer level achieves high overall barrier performance while keeping each individual layer relatively simple in composition and structure.
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 multilayer system offers excellent barrier properties for sensitive food products while being compatible with existing recycling streams and neutral to the environment, decomposing into carbon dioxide, water, and biomass, thus minimizing microplastic pollution and maintaining performance.
Implementation Method 1
the first layer has an oxygen transmission barrier
Implementation Method 2
the second layer has a water vapor and/or humidity barrier. The second layer comprises a wax
Implementation Method 3
the multilayer and/or the polymer composition is neutral to the environment and decomposed in short time into carbon dioxide (CO2) and water (H2O) as well as biomass
Data Source
AI summary
The multilayer (5) comprises at least one first layer (1) comprising water-soluble polymer, wherein the first layer (1) has an oxygen transmission barrier. The multilayer (5) further comprises at least one second layer (2), wherein second layer (2) has a water vapor and/or humidity barrier. The second layer (2) comprises a wax (20). The wax (20) can be in particular a natural wax, in particular food-safe wax, in particular biodegradable wax, in particular bee wax. The wax (20) enables to minimize the risk of migration of odours from and/or to the packaged goods. The multilayer (5) further comprises at least one third layer (3). The third layer (3) also comprises a water-soluble polymer. The first layer (1) comprises a first sublayer (11) and a second sublayer (12), both of which can comprise the water-soluble polymer.