Reduced Graphene Oxide Coating for Recyclable Liquid Cartons
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Solution Overview
Problem
Existing packaging materials for liquid food containers, particularly those aiming to replace aluminum foil, face challenges in achieving cost-effectiveness, recyclability, and maintaining gas barrier properties under varying moisture conditions, while being mechanically robust and suitable for aseptic packaging.
Innovation Solution
A method involving coating a substrate material with a layer of reduced graphene oxide using an aqueous dispersion, followed by drying, to create a gas-barrier coating, which is then laminated with additional polymer layers to form a laminated packaging material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum foil is used as barrier material, then gas barrier properties are superior, but recyclability and cost-effectiveness deteriorate
Solution Approach 1:
The patent changes the material parameter from aluminum foil to a polymer dispersion coating (such as polyvinylidene chloride or ethylene-vinyl alcohol copolymer), transforming the barrier material from a metal to an organic polymer that can be applied as a thin coating layer, thereby achieving comparable barrier properties with improved recyclability and cost-effectiveness
Solution Approach 2:
The patent creates a composite structure by combining polymer dispersion coating with cellulose-based substrate and lamination layers, forming a multi-layer composite material that achieves superior gas barrier properties while maintaining recyclability and cost-effectiveness through the synergistic combination of different materials
2Ease of manufacture
If polymer barrier coatings are applied, then recyclability improves, but gas barrier properties deteriorate under varying moisture conditions
Solution Approach 1:
The patent employs a multi-layer composite structure where the polymer dispersion coating is combined with cellulose-based substrates and additional lamination layers, creating a synergistic system where each layer compensates for the others' weaknesses regarding moisture sensitivity while maintaining gas barrier properties
Solution Approach 2:
The patent applies a polymer dispersion coating as a pre-treatment layer before final lamination, creating a preliminary barrier that is optimized to work in conjunction with subsequent layers to maintain gas barrier properties under varying moisture conditions throughout the packaging structure
3Device complexity
If thin barrier coatings are used, then material complexity reduces, but mechanical robustness deteriorates
Solution Approach 1:
The patent creates a composite material system where thin polymer dispersion coatings are applied to cellulose-based substrates and combined with lamination layers, achieving the desired barrier properties with minimal material while the composite structure itself provides the necessary mechanical robustness through the combined strength of multiple layers
4Reliability
If multilayer films are combined to achieve high barrier properties, then gas barrier performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies polymer dispersion coating as a preliminary step before final lamination, creating a pre-formed barrier layer that simplifies subsequent manufacturing steps by reducing the number of separate coating operations needed and enabling more efficient production processes
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 resulting packaging material provides excellent gas barrier properties, is cost-effective, recyclable, and maintains integrity under mechanical stress, enabling long-term aseptic storage of liquid foods without aluminum foil.
Implementation Method 1
an aqueous dispersion, followed by drying, to create a gas-barrier coating
Implementation Method 2
coating a substrate material with a layer of reduced graphene oxide using an aqueous dispersion
Implementation Method 3
drying the wet coated substrate material obtained from step c), by forced evaporation
Implementation Method 4
which is then laminated with additional polymer layers to form a laminated packaging material
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3~4a
AI summary
The present invention relates to a method for manufacturing a gas-barrier coated substrate material (10a; 10b), coated with a layer of reduced graphene oxide. The invention further relates to laminated packaging materials (20a; 20b) comprising the barrier-coated substrate material (10a; 10b), in particular intended for liquid carton food packaging, and to liquid carton packaging containers comprising the laminated packaging material.