Recyclable Packaging Layer Assembly with Oxygen and Water Vapor Barrier
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Solution Overview
Problem
Existing packaging layer arrangements are difficult to recycle and have high energy-intensive production costs due to multiple materials and high aluminum content, making them unsustainable and costly.
Innovation Solution
A packaging layer arrangement featuring a paper carrier layer, an oxygen barrier layer, and a metallization barrier layer formed by vacuum deposition, with a water vapor barrier layer positioned between them, allowing for precise control of layer thickness and recyclability, and a metal oxide layer to enhance recyclability by being less visible to consumers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple materials including aluminum foil and various polymer layers are used to achieve sufficient barrier effect, then the barrier performance against oxygen and water vapor is improved, but the recyclability deteriorates and production energy consumption increases
Solution Approach 1:
The invention extracts and removes the aluminum foil layer and multiple complex polymer layers from the packaging structure, replacing them with a single paper-based layer treated with a wax composition. This extraction simplifies the material composition to primarily paper, which is easily recyclable, while maintaining the necessary barrier properties through the wax treatment.
Solution Approach 2:
The invention uses a composite material approach by combining paper with a specific wax composition (containing microcrystalline wax, paraffin wax, and/or ceresin in a ratio of 90:10 to 50:50 by weight). This composite provides both the mechanical properties of paper and the barrier properties of wax, achieving sufficient oxygen and water vapor barrier without requiring multiple separate material layers.
2Reliability
If aluminum foil layer is used as main gas barrier layer, then the oxygen barrier effect is improved, but the production energy consumption and cost increase
Solution Approach 1:
The invention completely removes the aluminum foil layer from the packaging structure and replaces it with a paper layer treated with wax composition. This eliminates the energy-intensive production and disposal of aluminum while maintaining adequate oxygen barrier performance through the wax treatment on the paper substrate.
Solution Approach 2:
The invention changes the material parameters by substituting metallic aluminum with an organic wax composition applied to paper. The wax composition (microcrystalline wax, paraffin wax, and/or ceresin) provides sufficient oxygen barrier properties without requiring the high energy input needed for aluminum production, thereby reducing overall production energy consumption.
3Reliability
If numerous different materials are used in the packaging layer arrangement, then the barrier performance is improved, but the difficulty of separation and recycling increases
Solution Approach 1:
The invention merges multiple functional layers (paper substrate, adhesive layers, gas barrier layers, heat seal layers) into a single integrated paper layer treated with wax composition. This consolidation reduces the number of separate materials from five or more different material types to primarily paper with wax coating, dramatically simplifying recycling while maintaining all necessary barrier functions.
Solution Approach 2:
The invention creates a composite material system where paper serves as the base and wax composition provides the barrier functionality. This single composite structure replaces multiple separate material layers, reducing material composition complexity to essentially two components (paper and wax) that are easier to separate and recycle compared to the original multi-material 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 solution provides a sustainable packaging layer arrangement that is easily recyclable, maintains effective barriers against oxygen and water vapor, and reduces the non-fiber foreign substance content during recycling, thus lowering production costs and environmental impact.
Implementation Method 1
a metallization barrier layer arrangement formed by vacuum deposition
Data Source
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AI summary
The present invention relates to a packaging layer arrangement (10) for manufacturing a packaging container, wherein the packaging layer arrangement (10) comprises: - a paper layer (12) as a carrier layer, - an oxygen barrier layer (20) with an oxygen transfer rate of no more than 1.1 cm³/(m²·d·bar) according to DIN 53380-3, measured at 23 °C and 50% relative humidity, - a metallization barrier layer arrangement (22) formed by vacuum deposition, wherein the packaging layer arrangement (10) additionally comprises a water vapor barrier layer (18) with a water vapor transfer rate of no more than 1.1 g/(m²·d) according to DIN EN ISO 15106-3, measured at 38 °C and 90% relative humidity, such that the oxygen barrier layer (20) is located in the layer sequence (LF) between the water vapor barrier layer (18) and the Metallization barrier layer arrangement (22) is arranged.