Laminated Heat Transfer Sheet with Vertical Filler Orientation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heat conductive sheets require a large amount of platy heat-conductive filler to achieve improved heat conductivity, which compromises flexibility and increases material costs.
Innovation Solution
A heat conductive sheet with a laminated structure of resin layers, where the platy heat-conductive filler is oriented at an angle of 60° or more with respect to the sheet major surface, and the resin layers have a width 1-2000 times larger than the filler thickness, using a reduced amount of filler to achieve high heat conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large amount of platy heat-conductive filler is used to improve heat conductivity, then heat conductivity is improved, but flexibility deteriorates and material cost increases
Solution Approach 1:
The invention changes the orientation dimension of the platy heat-conductive filler from parallel to perpendicular relative to the sheet surface. By orienting the major axis of the filler perpendicular to the sheet major surface, heat conduction is enhanced in the thickness direction without requiring excessive filler content, thus maintaining flexibility and reducing material cost.
Solution Approach 2:
The invention changes the orientation parameter of the platy heat-conductive filler from horizontal (parallel to sheet surface) to vertical (perpendicular to sheet surface). This parameter change enables effective heat conduction with reduced filler content, resolving the contradiction between heat conductivity improvement and flexibility maintenance.
2Temperature
If a large amount of platy heat-conductive filler is used to improve heat conductivity, then heat conductivity is improved, but material cost increases
Solution Approach 1:
By reorienting the filler from horizontal to vertical arrangement, the invention achieves efficient heat conduction pathways through the sheet thickness with significantly reduced filler quantity, eliminating the need for large amounts of expensive filler material.
Solution Approach 2:
The invention creates a composite structure where platy heat-conductive filler is vertically oriented within a resin matrix, forming an optimized composite material that achieves high heat conductivity with minimal filler content, reducing material cost.
3Temperature
If the platy heat-conductive filler is oriented perpendicular to the sheet major surface, then heat conductivity in the thickness direction is improved, but manufacturing complexity increases
Solution Approach 1:
The invention incorporates the filler in a vertically oriented state during the molding process itself, rather than requiring post-manufacturing orientation steps. This preliminary action of orienting filler during manufacturing simplifies the overall process despite the complex orientation requirement.
Solution Approach 2:
By changing the orientation parameter of the filler to vertical during the molding process, the invention achieves perpendicular orientation that enhances heat conductivity while integrating the orientation step into the standard manufacturing workflow, minimizing additional process complexity.
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 provides enhanced heat conductivity in the thickness direction while maintaining flexibility and reducing material costs, achieving a heat conductivity of 3 W/m·K or more with a balanced physical property profile.
Implementation Method 1
A heat conductive sheet is disposed mainly between a heating element, such as a semiconductor package, and a radiator made of aluminium, copper, or the like and functions to rapidly transfer heat generated in the heating element to the radiator
Implementation Method 2
The heat conductive sheet according to the present invention has a laminated structure of a plurality of resin layers including a heat-conductive resin layer comprising a platy heat-conductive filler
Data Source
Figure 1~2
Figure 3~4
AI summary
The heat conductive sheet of the present invention has a laminated structure of resin layers including a heat-conductive resin layer comprising a platy heat-conductive filler, a sheet major surface being a plane perpendicular to laminated faces of the resin layers, and the major axis of the platy heat-conductive filler being oriented at an angle of 60° or more with respect to the sheet major surface. According to the present invention, a heat conductive sheet that achieves improvement of the heat conductivity thereof can be provided while the amount of the platy heat-conductive filler used is reduced, and the method for producing the same can also be provided.