Laminated Packaging Container Stiffness and Environmental Load
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Solution Overview
Problem
Conventional packaging containers with plastic film substrates lack stiffness, making them unstable and difficult to dispose of environmentally, while increasing thickness to enhance stiffness complicates disposal and increases environmental load.
Innovation Solution
A laminated packaging container with a paper substrate, a barrier layer formed by vapor-deposited inorganic compounds, and a sealant layer, folded into a W shape with specific sealing structures to enhance stability and sealing performance, allowing for self-supporting use and efficient microwave heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the plastic film substrate is increased to enhance stiffness, then the packaging container achieves better self-supporting capability, but it becomes more difficult to dispose of and increases environmental load
Solution Approach 1:
The patent employs a laminated structure combining paper substrate with plastic film layers. The paper substrate provides the primary stiffness and structural support, while the plastic film layers (including barrier and sealant layers) provide protection and sealing functionality. This composite approach allows the container to achieve adequate stiffness without requiring excessive thickness of any single material, thereby reducing overall environmental impact while maintaining structural integrity
Solution Approach 2:
The patent optimizes the thickness parameters of each layer in the laminated structure. By carefully selecting and adjusting the thickness of the paper substrate and each plastic film layer, the design achieves the minimum necessary stiffness for self-supporting capability while minimizing material usage. This parameter optimization ensures the container is sufficiently rigid for stable placement without excessive thickness that would complicate disposal
2Adaptability or versatility
If a plastic film substrate is used to enable microwave heating, then the packaging container can be heated directly, but the film is low in stiffness and cannot form a stable self-supporting structure
Solution Approach 1:
The patent combines paper substrate with plastic film layers to create a composite structure where each material contributes its superior properties. The paper substrate provides the necessary stiffness and structural framework for self-supporting stability, while the plastic film layers maintain microwave heating compatibility. This composite material approach resolves the contradiction by allowing the container to simultaneously achieve structural rigidity and microwave adaptability
Solution Approach 2:
The laminated packaging container is designed to perform multiple functions: it provides structural support for stable placement, enables microwave heating through the plastic film layers, offers barrier protection, and allows for sealing. The multi-functional design ensures the container can be both heated in a microwave oven and maintain sufficient stiffness for self-supporting capability without requiring separate containers for different uses
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 container achieves stability and self-supporting capability while reducing environmental impact through a paper substrate that is easier to dispose of and allows for efficient microwave heating without affecting design or labeling.
Implementation Method 1
a barrier layer (2B) excellent in various barrier properties to oxygen, ultraviolet rays and the like
Implementation Method 2
barrier layer (2B) excellent in various barrier properties to oxygen, ultraviolet rays and the like
Implementation Method 3
a sealant layer (2C) excellent in sealing properties including thermocompression sealing properties
Implementation Method 4
which can be used for cooking with a microwave oven
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(e)
AI summary
Provided is a stably freestanding packaging container. A packaging container (1) comprises a laminated sheet (2) where at least a substrate (2A), a barrier layer (2B) and a sealant layer (2C) are laminated together in this order, and the laminated sheet (2) has a stiffness of 1.01 [mN·m] or less measured by a Taber stiffness tester method in accordance with JIS-P8125.