Laminated Cellulose Packaging Composite for Cost and Barrier Trade-offs
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Solution Overview
Problem
Current liquid carton packaging materials face challenges in reducing costs while maintaining mechanical stability and barrier properties, with down-gauging the cellulose-based bulk layer compromising packaging integrity and barrier performance.
Innovation Solution
A laminated cellulose-based packaging material with a bulk layer comprising containerboard material and a separate print substrate layer on the outside, combined with a barrier metal foil or film and a polyamide barrier layer between the bulk layer and the innermost heat sealable layer, providing enhanced mechanical stability and barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the cellulose-based bulk layer is reduced to decrease costs, then packaging material costs are reduced, but mechanical strength and packaging integrity are compromised
Solution Approach 1:
The patent applies composite materials by combining the cellulose-based bulk layer with a polyamide barrier layer and an aluminium foil layer. This multi-layer composite structure allows the bulk layer to be thinner while maintaining overall mechanical strength and barrier properties through the synergistic combination of different materials, each contributing specific properties to the final packaging structure.
2Quantity of substance
If the thickness of the cellulose-based bulk layer is reduced to decrease costs, then packaging material costs are reduced, but barrier properties are compromised
Solution Approach 1:
The patent uses composite materials to address barrier properties by introducing a polyamide layer and an aluminium foil layer. The polyamide layer provides a first barrier against gas and moisture penetration, while the aluminium foil layer provides a second, superior barrier. This composite barrier system compensates for the reduced thickness of the bulk layer, maintaining overall barrier reliability while reducing material costs.
Solution Approach 2:
The patent applies local quality by concentrating barrier functionality in specific layers rather than distributing it uniformly throughout the bulk layer. The polyamide and aluminium foil layers are strategically positioned to provide enhanced barrier properties at critical interfaces, allowing the bulk layer to be thinner while maintaining overall barrier performance.
3Quantity of substance
If the cellulose-based bulk layer is down-gauged to reduce costs, then material costs are reduced, but packaging integrity is compromised
Solution Approach 1:
The patent employs composite materials to maintain packaging integrity with a down-gauged bulk layer. The combination of the bulk layer with the polyamide barrier layer and aluminium foil barrier layer creates a structurally sound composite package that maintains integrity even when the bulk layer is thinner than conventional packaging.
4Device complexity
If polymeric gas barrier materials are used to replace aluminium foil, then material complexity is reduced, but gas barrier properties are inferior
Solution Approach 1:
The patent uses composite materials to achieve superior gas barrier properties. By combining the polyamide layer with the aluminium foil layer, the packaging achieves excellent gas barrier performance that surpasses what could be obtained with polymeric materials alone, while maintaining a manageable multi-layer 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 achieves cost-efficient packaging with improved mechanical strength and barrier properties, allowing for customizable outer layers and extended shelf-life without compromising packaging integrity or barrier effectiveness.
Implementation Method 1
The layer of an aluminium foil in the packaging laminate provides gas barrier properties quite superior to most polymeric gas barrier materials.
Implementation Method 2
a further barrier layer comprising at least 50 wt-% up to 100 wt% of a polyamide
Implementation Method 3
an innermost, heat sealable and liquid-tight layer of a thermoplastic polymer
Data Source
Figure 1a~1c
Figure 2a~2b
Figure 3a~3b
AI summary
The present invention relates to a laminated cellulose-based liquid or semi-liquid food packaging material, comprising a bulk layer from cellulose fluting material, an outside substrate layer having a print surface and on the inside an aluminium foil barrier and a further barrier layer. The invention further relates to the method for manufacturing the laminated packaging material and to a packaging container for liquid food packaging, comprising the laminated packaging material.