Paper-Based Gas Barrier Laminate for Crease-Resistant Packaging
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Solution Overview
Problem
Packaging bags with acute-angled creases, such as pillow, three-sided seal, and gusset packaging, face issues with cracks in the barrier layer, leading to deteriorated gas barrier properties. Additionally, there is a need to reduce plastic usage in gas barrier laminates.
Innovation Solution
A gas barrier laminate is developed with a paper substrate and a vapor-deposited layer, capable of hermetic sealing by heat sealing. The laminate has a basis weight of 30 to 100 g/m², a water vapor transmission rate of 3 g/m²·day or less, and a paper substrate weight of 47% or more by mass, ensuring sufficient gas barrier properties even after folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If paper is used as packaging material instead of plastic, then plastic reduction is achieved, but gas barrier properties are insufficient
Solution Approach 1:
The patent applies composite materials by combining paper substrate with plastic layers (PLA and PE) to create a laminated structure. The paper layer provides mechanical strength and plastic reduction, while the plastic layers provide gas barrier properties. This composite structure resolves the contradiction by integrating the advantages of both materials.
Solution Approach 2:
The patent applies local quality by providing plastic coating only on specific surfaces of the paper substrate where gas barrier protection is needed. The vapor-deposited layer is applied locally on the paper surface, providing enhanced barrier properties at critical locations without requiring complete plastic coverage, thus reducing overall plastic usage while maintaining gas barrier functionality.
2Adaptability or versatility
If packaging bags with acute-angled creases are used, then versatility in packaging shapes is improved, but cracks are generated in the barrier layer causing gas barrier property deterioration
Solution Approach 1:
The patent applies parameter changes by carefully controlling the basis weight of the paper substrate (30-100 g/m²) and the thickness/composition of the vapor-deposited layer. These parameter optimizations ensure that the laminate has sufficient flexibility to accommodate acute-angled creases without cracking, while maintaining gas barrier properties. The specific basis weight range provides the right balance between flexibility and structural integrity.
Solution Approach 2:
The laminated composite structure of paper and plastic layers provides differentiated mechanical properties. The paper substrate provides flexibility and crease retention, while the plastic layers provide barrier properties and crack resistance. This composite structure allows the packaging to withstand acute-angled folding without compromising the gas barrier function.
3Strength
If the paper substrate basis weight is increased to improve strength, then crack resistance is improved, but plastic material reduction is compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the paper substrate basis weight to a specific range (30-100 g/m²) and controlling the vapor-deposited layer thickness. This optimized parameter combination achieves sufficient crack resistance for acute-angled creases while minimizing plastic usage. The vapor-deposited layer compensates for reduced paper thickness, maintaining strength without requiring excessive paper weight.
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 gas barrier laminate maintains excellent gas barrier properties after folding and contributes to a significant reduction in plastic usage, making it suitable for packaging bags with acute-angled creases while ensuring the protection of contents.
Implementation Method 1
a vapor-deposited layer
Implementation Method 2
capable of hermetic sealing by heat sealing
Data Source
AI summary
Provided is a gas barrier laminate being capable of hermetic sealing by heat sealing, and having a paper substrate and a vapor-deposited layer, in which the paper substrate has a basis weight of 30 to 100 g/m2, the water vapor transmission rate is 3 g/m2/d or less at 40° C. and 90% RH, the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on the outer side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m2/d or less at 40° C. and 90% RH, and the water vapor transmission rate obtained by folding the gas barrier laminate with the paper substrate placed on the inner side, rolling a roller having a weight of 2 kg thereon one time, opening a fold, and making measurement, is 4 g/m2/d or less at 40° C. and 90% RH.