Cellulose Barrier Paper for Foil-Free Liquid Packaging
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Solution Overview
Problem
Current laminated packaging materials for liquid foods are costly and lack efficient mechanical stability and barrier properties, particularly for long-term storage, and there is a need for a cost-effective, non-foil solution that maintains nutritional quality and package integrity.
Innovation Solution
A laminated cellulose-based packaging material with a compact-surface barrier paper layer, having a density of 800 kg/m³ or higher, surface roughness below 450 ml/minute, and a thickness of 60 g/m² or lower, combined with a low-density cellulose bulk layer and additional thermoplastic polymer layers for enhanced mechanical strength and oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum foil is used as the barrier layer, then oxygen barrier properties are improved, but packaging material cost increases
Solution Approach 1:
The invention extracts and removes the aluminum foil layer from the packaging laminate, replacing it with a paper-based barrier layer. This eliminates the need for expensive metal materials while maintaining the essential oxygen barrier function through alternative means (paper coating or laminated structure).
Solution Approach 2:
The invention merges the barrier function traditionally provided by aluminum foil with the paper bulk layer through coating or lamination techniques. The paper layer is combined with barrier coatings (such as polyethylene, polyvinyl alcohol, or other polymer coatings) to achieve the required oxygen barrier properties without using metal foil.
2Ease of manufacture
If cellulose bulk layer density is reduced to lower cost, then packaging material cost decreases, but mechanical strength and barrier properties deteriorate
Solution Approach 1:
The invention creates a composite material structure where a lower-density, cost-effective cellulose bulk layer is combined with a barrier coating or laminated layer. The composite structure allows the bulk layer to provide bulk volume and basic mechanical properties at reduced cost, while the coating layer compensates for the reduced barrier properties of the lighter bulk material.
Solution Approach 2:
The invention applies different quality levels to different parts of the packaging structure. The bulk layer uses lower-density, cost-reduced cellulose material, while the critical barrier interface (inner surface contacting the product) receives enhanced treatment through coating or lamination to ensure adequate barrier properties despite the reduced bulk density.
3Ease of manufacture
If polymer layer thickness is reduced to decrease cost, then packaging material cost decreases, but mechanical stability and barrier properties worsen
Solution Approach 1:
The invention changes the parameters of the polymer coating layer, using thinner applications of multiple functional coatings rather than thick single layers. By optimizing coating thickness, composition, and applying multiple functional layers (sealant, barrier, adhesive), the invention achieves required performance at reduced material consumption and lower cost.
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 cost-effective, mechanically stable packaging material with improved oxygen barrier and integrity properties, capable of maintaining nutritional quality and package integrity for extended storage periods without the need for aluminum foil, while being environmentally friendly by utilizing renewable materials.
Implementation Method 1
a barrier layer laminated between the bulk layer and the innermost layer for additional contribution to the bending stiffness of the laminated packaging material, wherein the barrier layer is a compact-surface barrier paper, which has a density of 800 kg/m3 or higher, surface roughness below 450 ml/minute
Implementation Method 2
an innermost, heat sealable and liquid-tight layer of a thermoplastic polymer
Implementation Method 3
both of the longitudinal edges of the web being united to each other in an overlap joint by welding together the inner- and outermost heat sealable thermoplastic polymer layers
Implementation Method 4
adhesive polymers
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2b
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 of paper, paperboard or other cellulose-based material, an innermost, heat sealable and liquid-tight layer of a thermoplastic polymer, the innermost polymer layer intended to be in direct contact with the packaged food product, a barrier layer laminated between the bulk layer and the innermost layer. 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.