High-frequency Dielectric Heating Adhesive Sheet
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Solution Overview
Problem
Typical adhesive sheets without a releasable sheet face challenges in accurately positioning and applying large-area adhesive sheets, and they lack the ability to adhere through high-frequency dielectric heating due to the absence of a dielectric filler.
Innovation Solution
A high-frequency dielectric heating adhesive sheet combining a sheet-shaped base material with a high-frequency dielectric adhesive layer containing a thermoplastic resin and a dielectric filler, such as zinc oxide, which eliminates the need for a releasable sheet and enables excellent adhesion and handleability even on large surfaces through dielectric heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive sheets without releasable sheet include multiple heat sensitive adhesive layers, then adhesive force is improved, but positioning accuracy and application speed deteriorate when the sheet size is large
Solution Approach 1:
The patent replaces the mechanical positioning system (multiple adhesive layers requiring manual alignment) with a dielectric heating system. The adhesive layer containing dielectric filler (5-500 parts by mass per 100 parts thermoplastic resin) enables thermal activation through dielectric heating, allowing the adhesive to activate automatically upon contact with the adherend without requiring precise manual positioning or multiple layers.
Solution Approach 2:
The patent changes the physical and chemical parameters of the adhesive layer by incorporating dielectric filler at specific concentrations (5-500 parts by mass per 100 parts thermoplastic resin). This parameter change enables the adhesive to respond to dielectric heating, transforming it from a passive adhesive system requiring precise positioning to an active system that can be thermally activated on demand, thereby improving both positioning accuracy and application speed.
2Strength
If adhesive sheets without releasable sheet include multiple adhesive layers, then adhesive force is improved, but application time increases excessively
Solution Approach 1:
The patent replaces the multi-layer adhesive system (requiring sequential application and waiting for each layer to set) with a single adhesive layer containing dielectric filler that can be rapidly activated through dielectric heating. This substitution reduces the application process from multiple sequential steps to a single step with rapid thermal activation, significantly reducing application time while maintaining strong adhesive force.
Solution Approach 2:
The patent employs periodic dielectric heating to rapidly activate the adhesive layer. By applying high-frequency electric fields in periodic pulses, the dielectric filler particles generate heat quickly, melting the thermoplastic resin and activating the adhesive force in a short time period, thereby reducing overall application time while maintaining strong bonding.
3Device complexity
If adhesive sheets lack dielectric filler, then material simplicity is maintained, but high-frequency dielectric heating adhesion capability is lost
Solution Approach 1:
The patent creates a composite adhesive layer by combining thermoplastic resin with dielectric filler (5-500 parts by mass per 100 parts thermoplastic resin). This composite material structure maintains the simplicity of the base adhesive system while adding the functional capability to respond to dielectric heating. The dielectric filler particles distributed within the thermoplastic resin matrix enable efficient energy absorption and heat generation, providing rapid adhesion activation without significantly complicating the material system.
Solution Approach 2:
The patent makes the adhesive layer multi-functional by incorporating dielectric filler into the thermoplastic resin matrix. The resulting composite adhesive layer simultaneously provides: (1) adhesive bonding function through the thermoplastic resin, and (2) dielectric heating response function through the dielectric filler. This multi-functionality allows the same material layer to perform both adhesion and rapid thermal activation, eliminating the need for separate heating elements or complex 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 provides excellent handleability and adhesiveness to various adherends with a favorable adhesive force, even on large surfaces, and allows for rapid adhesion through dielectric heating, overcoming the limitations of existing adhesive sheets.
Implementation Method 1
high-frequency dielectric heating adhesive sheet... adheres to the adherend through high-frequency dielectric heating
Data Source
AI summary
A high-frequency dielectric heating adhesive sheet requires no releasable sheet, exhibiting excellent handleability and workability to an adherend even when a size of the high-frequency dielectric heating adhesive sheet is large, and an adhesion method of the high-frequency dielectric heating adhesive sheet. The high-frequency dielectric heating adhesive sheet includes a sheet-shaped base material and a high-frequency dielectric adhesive layer containing a thermoplastic resin as a component A and a dielectric filler as a component B.