Cellulose Sandwich Packaging Material With Thin-Layer Barrier Strength
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Solution Overview
Problem
Existing laminated packaging materials for liquid food containers are costly, mechanically inadequate, and lack decorative and tactile differentiation options, while relying heavily on non-renewable materials like aluminum foil, which complicates manufacturing and increases environmental impact.
Innovation Solution
A laminated packaging material comprising a low-density cellulose spacer layer, paper facing layers, and adhesive layers to create a sandwich structure with improved mechanical stability and barrier properties, allowing for decorative and tactile customization without increasing costs, using renewable materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of polymer layers is reduced to decrease costs, then packaging material cost decreases, but mechanical strength and barrier properties deteriorate
Solution Approach 1:
The patent combines thin polymer layers with a cellulose fiber bulk layer to create a composite packaging material. The cellulose bulk layer provides mechanical strength and structural integrity, while the thin polymer layers provide barrier properties. This composite structure allows cost reduction through down-gauging of polymer layers while maintaining overall performance through the reinforcing cellulose matrix.
2Quantity of substance
If the thickness of cellulose bulk layer is reduced to decrease costs, then packaging material cost decreases, but mechanical strength and packaging integrity deteriorate
Solution Approach 1:
The patent creates a composite structure where a relatively thin cellulose bulk layer is reinforced by outer polymer layers and internal air pockets or voids. The cellulose bulk layer provides cost-effective bulk material while the composite architecture (including skin layers and potential hollow structures) maintains mechanical strength and integrity.
Solution Approach 2:
The patent applies different material properties to different regions of the packaging structure. The bulk layer uses cost-effective cellulose material, while critical areas requiring strength and barrier properties use enhanced polymer layers. This localized optimization allows cost reduction in non-critical areas while maintaining strength where needed.
3Strength
If conventional packaging materials are used to maintain mechanical stability, then packaging integrity is maintained, but cost increases and environmental impact worsens
Solution Approach 1:
The patent changes the material composition parameters by substituting portions of traditional polymer and aluminum materials with cellulose-based materials. This parameter change reduces reliance on non-renewable resources, lowers cost, and improves environmental sustainability while maintaining mechanical stability through optimized composite structure design.
4Reliability
If aluminum foil is used to provide gas barrier properties, then barrier performance is superior, but manufacturing complexity and environmental impact increase
Solution Approach 1:
The patent replaces the conventional aluminum foil barrier layer with a composite structure using cellulose bulk material and polymer layers. This substitution maintains adequate gas barrier properties while simplifying manufacturing (eliminating aluminum lamination steps) and reducing environmental impact through use of renewable materials.
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 cost-effective, mechanically stable, and aesthetically customizable packaging materials that maintain nutritional quality and integrity for long-term storage, reducing reliance on non-renewable materials and minimizing manufacturing complexity.
Implementation Method 1
A laminated packaging material comprising a low-density cellulose spacer layer, paper facing layers, and adhesive layers to create a sandwich structure with improved mechanical stability
Data Source
Figure 1a
Figure 2a
Figure 3a~3b
AI summary
The present invention relates to a method for manufacturing of a laminated cellulose-based liquid or semi-liquid food packaging material, wherein the laminated packaging material has a bulk material layer comprising a low-density cellulose spacer layer, an outside module comprising a substrate layer having a print surface and an inside material module comprising a barrier layer or barrier coating. The invention further relates the laminated packaging materials obtained by the method and to a packaging container for liquid food packaging, comprising the laminated packaging material or being made from the laminated packaging material obtained by the method.