Metalized Heat Insulating Sheet With Through-Hole Joining
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Solution Overview
Problem
Existing heat insulating materials with resin films and nonwoven fabrics struggle to achieve both weight reduction and effective heat insulation properties.
Innovation Solution
A heat insulating sheet comprising a resin film with a metal layer and a nonwoven fabric, where the resin film and nonwoven fabric are joined by through holes, with a specific ratio of hole distances and states, allowing the nonwoven fabric to be taut and the resin film to be loose, enhancing the material's ability to suppress heat conduction and radiant heat while reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat insulating material is made by stacking resin films with metal layers and nonwoven fabrics, then heat insulation properties are improved, but weight reduction becomes difficult to achieve
Solution Approach 1:
The invention uses thin resin films with metal layers and thin nonwoven fabrics to create a lightweight heat insulating material. The resin film is made as thin as possible while maintaining its barrier function, and the nonwoven fabric is selected to have low density (2 g/m²), thereby achieving weight reduction without sacrificing heat insulation properties.
Solution Approach 2:
The invention combines different materials (resin film with metal layer and nonwoven fabric) into a composite structure. This composite material leverages the reflective properties of the metal layer to block radiant heat and the insulating properties of the nonwoven fabric to reduce conductive heat transfer, achieving effective heat insulation with minimal weight.
2Ease of manufacture
If through holes are provided in both resin film and nonwoven fabric, then joining is achieved, but heat conduction increases
Solution Approach 1:
The invention creates different local states for the resin film and nonwoven fabric around the through holes. The nonwoven fabric is kept in a taut state to minimize its surface area and reduce heat conduction paths, while the resin film is allowed to be in a loose state to maintain its barrier function and reflect radiant heat, thereby minimizing heat conduction through the joining points.
3Weight of moving object
If nonwoven fabric density is reduced for weight reduction, then handleability improves, but structural stability deteriorates
Solution Approach 1:
The invention applies tension to the nonwoven fabric during the formation of through holes, creating a taut state before the joining process. This preliminary action ensures that the low-density nonwoven fabric maintains its structural integrity and stability during manufacturing and application, preventing excessive deformation or sagging despite its low density.
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 significantly reduces the weight of the heat insulating material while maintaining excellent heat insulation properties, improving handleability and efficiency in vacuum environments, and is suitable for applications in vacuum insulation and low atmospheric pressure conditions.
Implementation Method 1
a resin film having a metal layer... The metal layer may include at least one of aluminum, gold, silver, copper, platinum, tin, and nickel
Implementation Method 2
a manufacturing method according to the invention comprises a penetrating step of providing through holes penetrating the resin film and the nonwoven fabric by using a hot protrusion
Data Source
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AI summary
Provided are a heat insulating sheet and a heat insulating material which reflect radiant heat and exhibit excellent heat insulating performance under a vacuum environment or a low atmospheric pressure environment, and a manufacturing method of the heat insulating sheet. The heat insulating sheet may include a resin film having a metal layer, and a nonwoven fabric including resin fiber, wherein the resin film and the nonwoven fabric arejoined by through holes penetrating the resin film and the nonwoven fabric. A ratio (La/Lb) of an average distance (La) between the through holes in the resin film to an average distance (Lb) between the through holes in the nonwoven fabric may be 1.0010 or more and 1.10 or less.