Vacuum Insulation Outer Packaging Dimensional Stability
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Solution Overview
Problem
Existing vacuum insulation materials face challenges in maintaining insulating properties over time, especially when exposed to high temperature and high humidity environments, due to degradation of gas barrier properties.
Innovation Solution
A vacuum insulation material outer packing material comprising a thermally weldable film and a gas barrier film with a resin substrate and a barrier layer, designed to maintain a dimension change rate of 0.8% or less under extreme conditions, ensuring high gas barrier properties and preventing water vapor permeability increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional outer packing materials (multiple films adhered together) are used to provide gas barrier properties, then initial gas barrier performance is sufficient, but vacuum state cannot be maintained long-term in high temperature and high humidity environments
Solution Approach 1:
The invention uses a composite structure consisting of a thermally weldable film and a gas barrier film with specific dimensional stability characteristics. The gas barrier film comprises a resin substrate with a barrier layer, forming a composite material that resists dimensional changes in high temperature and high humidity environments, thereby maintaining the vacuum state and insulating properties over time.
Solution Approach 2:
The invention specifies that the dimension change rate of the outer packing material must be 0.8% or less when held for 2 hours at 70°C and 90%RH. By controlling this dimensional parameter under extreme conditions, the patent ensures that the gas barrier properties remain effective long-term, preventing vacuum degradation while maintaining the required structural integrity.
2Reliability
If outer packing material dimension changes significantly in high temperature and high humidity, then gas barrier properties degrade, but maintaining strict dimensional control increases material complexity
Solution Approach 1:
The invention controls the dimension change rate parameter to be 0.8% or less under specified test conditions (70°C, 90%RH for 2 hours). By setting this quantitative threshold, the patent provides a clear specification for material selection without requiring overly complex multi-layer structures, balancing reliability with manufacturability.
Solution Approach 2:
The gas barrier film is designed with specific local properties: a resin substrate with a barrier layer disposed on its surface. This localized functional design provides the necessary gas barrier performance and dimensional stability in the critical barrier region without requiring the entire outer packing structure to be overly complex.
3Ease of manufacture
If conventional films are used without strict dimensional control, then material selection is easier, but water vapor permeability increases over time in humid environments
Solution Approach 1:
The patent specifies a quantitative parameter (dimension change rate ≤0.8% at 70°C, 90%RH) that guides material selection. This clear criterion simplifies the manufacturing process by providing explicit selection rules while ensuring reliable water vapor barrier performance, avoiding both overly complex materials and inadequate conventional films.
Solution Approach 2:
The invention uses a practical outer packing material structure that provides sufficient long-term performance without excessive complexity. The thermally weldable film combined with the gas barrier film offers a cost-effective solution that maintains water vapor barrier performance over time, avoiding the need for overly complex or expensive multi-layer structures.
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 effectively maintains insulating properties for a long period in high temperature and high humidity environments, preventing gas infiltration and water vapor permeability rise, thus ensuring the vacuum insulation material's integrity and efficiency.
Implementation Method 1
the outer packing material requires various functions such as gas barrier properties to prevent gas from infiltrating from outside
Implementation Method 2
thermally welding edges of the bag body to seal
Implementation Method 3
Circulation of gas is blocked by making inside of the insulation material to be in a vacuum state, and thus the vacuum insulation material can exhibit high insulating properties
Data Source
Figure 1~2
Figure 3
Figure 4A~4F
AI summary
The main object of the present invention is to provide a vacuum insulation material outer packing material capable of forming a vacuum insulation material that can maintain insulating properties for a long period of time even in an environment with high temperature and high humidity. The present invention achieves the objective by providing a vacuum insulation material outer packing material comprising a thermally weldable film and a gas barrier film, characterized in that: the gas barrier film comprises a resin substrate, and a barrier layer disposed at least one surface side of the resin substrate; and when setting a dimension of the vacuum insulation material outer packing material under an atmosphere having a temperature of 25°C and a humidity of 0%RH as a reference, a dimension change rate of the vacuum insulation material outer packing material being 0.8% or less after the vacuum insulation material outer packing material is held for 2 hours under an atmosphere having a temperature of 70°C and a humidity of 90%RH.