Heat Conductive Foam Sheet for Electronic Instruments
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Solution Overview
Problem
Conventional heat dissipation materials for electronic equipment, such as heat dissipation grease and gel, and urethane foam, face challenges in reapplication, sheet thickness, compressive strength, and flexibility, making them unsuitable for effectively dissipating heat in densely integrated electronic devices.
Innovation Solution
A heat conductive laminate with a foam sheet having a compressive strength of 50 to 190 kPa, a thickness of 0.05 to 1.0 mm, and an apparent density of 0.1 to 1.5 g/cm³, coated with a heat conductive sheet of 200 W/m·K or more, utilizing elastomer resin and heat conductive fillers like aluminum oxide, to enhance heat conductivity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat dissipation grease is used, then heat dissipation performance is improved, but reapplication becomes difficult and production yield decreases
Solution Approach 1:
The invention uses a foam sheet that can be easily replaced and reapplied multiple times. Unlike heat dissipation grease that becomes difficult to reapply once applied, the foam sheet is designed as a disposable or easily replaceable component that maintains its heat dissipation functionality through multiple application cycles, thereby improving production yield and ease of maintenance.
2Temperature
If heat dissipation gel is used, then heat dissipation performance is improved, but it is difficult to process into thin sheets and flexibility decreases when compressed
Solution Approach 1:
The invention changes the physical parameters of the heat dissipation material by using foam sheets with controlled thickness (0.05 to 1.0 mm) and controlled flexibility (25% compressive strength of 50 to 190 kPa). This allows the material to be processed into thin sheets while maintaining adequate flexibility for compression and conformability to electronic component surfaces, resolving the contradiction between thinness and flexibility.
3Length of stationary object
If urethane foam is molded into thin sheets, then thickness is reduced, but compressive strength increases and flexibility disappears
Solution Approach 1:
The invention optimizes the foam sheet parameters by controlling the 25% compressive strength to be between 50 to 190 kPa and thickness to be 0.05 to 1.0 mm. This parameter optimization ensures that even when molded into thin sheets, the foam maintains sufficient flexibility and compressibility to conform to electronic component surfaces while still providing effective heat dissipation.
4Shape
If foam sheet thickness is reduced to improve flexibility, then heat conductivity may decrease, but excessive thinness reduces structural integrity
Solution Approach 1:
The invention uses composite foam sheet materials that combine thermal conductivity enhancements with flexible foam structures. By incorporating heat conductive fillers or modifying the foam cell structure, the material achieves high heat conductivity even at thin dimensions (0.05 to 1.0 mm) while maintaining the flexibility and compressibility needed for electronic heat dissipation applications.
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 laminate effectively dissipates interior heat of electronic equipment to the exterior while maintaining flexibility and high heat conductivity, suitable for use in small electronic devices.
Implementation Method 1
a heat conductive sheet having a heat conductivity of 200 W/m·K or more, on at least one of the surfaces of a foam sheet
Data Source
Figure 1~2
AI summary
Provided is a heat conductive foam sheet for electronic equipment sufficiently thin and flexible to be suitably used in the interior of electronic equipment and excellent in heat conductivity. A heat conductive foam sheet for electronic equipment containing a heat conductor in an elastomer resin portion constituting the foam sheet, in which the content of the heat conductor relative to 100 parts by mass of the elastomer resin is 100 to 500 parts by mass, the 25% compressive strength of the foam sheet is 200 kPa or less and the thickness thereof is 0.05 to 1 mm.