3D-Moldable Heat-Generating Sheet Structure Without Surface Bulging
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Solution Overview
Problem
Three-dimensional molding of heat-generating sheets results in surface bulging due to embedded electrically conductive linear bodies, compromising conductivity and surface integrity.
Innovation Solution
A heat-generating sheet with a pseudo-sheet structure, comprising unidirectional electrically conductive linear bodies, a resin protective layer, and an adhesive layer, where the total thickness of the surface layers is between 1.5 to 80 times the diameter of the conductive bodies, maintaining conductivity while preventing surface bulging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrically conductive linear bodies are embedded in adhesive or resin layers during three-dimensional molding, then the sheet can be molded onto curved surfaces, but surface bulging occurs compromising surface integrity and conductivity
Solution Approach 1:
The patent transitions from a two-dimensional arrangement of conductive linear bodies on the sheet surface to a three-dimensional distributed arrangement within the sheet thickness. By embedding conductive bodies at multiple depth positions (first, second, and third positions from the resin layer), the conductive network maintains surface flatness while providing omnidirectional conductivity, resolving the conflict between moldability and surface integrity.
Solution Approach 2:
The patent implements a nested structure where conductive linear bodies are arranged at multiple hierarchical levels within the sheet thickness. The first conductive bodies are positioned nearest to the resin layer, with subsequent bodies at increasing distances, creating a layered nested configuration that prevents surface bulging while maintaining electrical connectivity through the molded structure.
2Reliability
If electrically conductive linear bodies are arranged densely to maintain high conductivity, then heat-generating efficiency improves, but surface bulging becomes more pronounced during molding
Solution Approach 1:
The patent resolves the density-surface flatness conflict by distributing conductive linear bodies across the third dimension (sheet thickness) rather than concentrating them at the surface. This vertical distribution allows high overall conductivity through multiple embedded layers while maintaining surface flatness, as no single location on the surface experiences excessive localized embedding.
3Length of moving object
If the resin protective layer is made thinner to reduce overall sheet thickness, then the sheet becomes more flexible for molding, but surface bulging of conductive bodies becomes more apparent
Solution Approach 1:
The patent employs nested positioning of conductive linear bodies at multiple depths within the resin layer thickness. By placing conductive bodies at first, second, and third positions from the resin layer, the structure accommodates thin overall sheet dimensions while preventing surface bulging, as the distributed arrangement prevents any single conductive body from protruding through the thin resin layer.
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 sheet maintains excellent heat-generating efficiency and prevents surface bulging after three-dimensional molding, ensuring consistent conductivity and surface integrity.
Implementation Method 1
a heat-generating sheet for use in three-dimensional molding including: a pseudo-sheet structure in which a plurality of electrically conductive linear bodies extending unidirectionally are arranged spaced apart from each other
Data Source
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AI summary
The present disclosure provides a heat-generating sheet for use in three-dimensional molding including: a pseudo-sheet structure in which plural electrically conductive linear bodies extending unidirectionally are arranged spaced apart from each other, each of the electrically conductive linear bodies having a diameter of from 7 µm to 75 µm; and a resin protective layer provided at a side of one surface of the pseudo-sheet structure. In this heat-generating sheet for use in three-dimensional molding, the total thickness of layers provided at the side of the pseudo-sheet structure at which the resin protective layer is provided is from 1.5 times to 80 times the diameter of the electrically conductive linear bodies. The present disclosure also provides a surface heat-generating article in which the heat-generating sheet for use in three-dimensional molding is used.