Laminated Packaging with Oriented Polyethylene for Stable Pouches
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Solution Overview
Problem
Existing laminated packaging materials for liquid, semi-liquid, and viscous food products lack sufficient mechanical robustness and dimensional stability, particularly in pouch packages, while also requiring improved barrier properties and heat seal strength for long-term ambient storage and consumer-friendly openability.
Innovation Solution
A laminated packaging material comprising a bulk layer of paper or cellulose-based material, a barrier layer, and a pre-manufactured polyethylene film with specific properties, including a biaxially oriented LLDPE innermost layer, enhances mechanical robustness and integrity, while maintaining heat sealability and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional laminated packaging materials are used, then basic packaging function is provided, but mechanical robustness and dimensional stability are insufficient
Solution Approach 1:
The patent applies composite materials by combining paper or paperboard bulk layers with polyethylene film layers having specific mechanical properties. The polyethylene layers are designed with controlled thickness (15-25 μm) and specific elastic moduli (≥400 MPa in MD, ≥500 MPa in CD) to provide enhanced mechanical robustness while maintaining dimensional stability. This composite structure resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The patent employs parameter changes by specifying precise mechanical properties for the polyethylene layers, including elastic modulus thresholds, tensile strength requirements, and elongation limits. By controlling these parameters, the material achieves both improved strength and maintained dimensional stability, resolving the technical contradiction through quantitative optimization.
2Reliability
If barrier properties are enhanced for long-term storage, then food preservation is improved, but heat sealability and openability may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the properties of different layers in the laminate. The polyethylene layers have specific mechanical and barrier properties for preservation, while the paper bulk layers provide structural support. This localized optimization allows each layer to excel at its specific function without compromising overall performance.
Solution Approach 2:
The composite laminate structure combines materials with different functional properties: polyethylene layers provide barrier and sealing functions, while paper layers provide structure and openability. This composite approach resolves the contradiction by distributing functions across different material layers.
3Strength
If mechanical robustness is increased for pouch packages, then package integrity is improved, but consumer-friendly openability may be reduced
Solution Approach 1:
The patent applies local quality by creating a laminate structure where different layers have different mechanical characteristics. The polyethylene layers provide strength and integrity, while the paper layers maintain ease of opening. This localized property distribution resolves the contradiction between robustness and openability.
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 material provides improved package integrity, heat seal strength, and consumer-friendly openability, ensuring the preservation of food quality for extended periods at ambient conditions, with reduced environmental impact.
Implementation Method 1
a pre-manufactured polyethylene film with specific properties, including a biaxially oriented LLDPE innermost layer
Implementation Method 2
an innermost layer, applied onto the aluminium foil, which innermost, inside layer may be composed of one or several part layers, comprising heat sealable thermoplastic polymers
Data Source
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AI summary
The present invention relates to a laminated packaging material (10) for pouch packaging of oxygen sensitive food products, and to a method for manufacturing thereof. The invention further relates to pouch packaging containers comprising the laminated packaging material, for packaging of oxygen-sensitive liquid food products.