Electroactive Polymer Coating Layer Pore Suppression
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Solution Overview
Problem
Existing touch sensitive elements face issues with leakage current and short circuits due to pore formation in electroactive layers, which affect vibration strength and durability, and struggle to achieve uniform thickness and resistance, limiting their performance and reliability.
Innovation Solution
A manufacturing method involving the application of an electroactive polymer solution on a substrate, followed by heating and pressurizing using a hot press roller to form an electroactive layer without separate polling processes, ensuring minimal pore formation and uniform thickness and resistance, and integrating electrodes for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electroactive polymer solution is coated and dried by conventional methods, then the electroactive layer is formed, but pores are generated due to solvent volatilization causing increased leakage current and reduced density
Solution Approach 1:
The patent uses supercritical fluid extraction to replace conventional solvent evaporation. The CO2 solvent is transformed from liquid to supercritical state during extraction, then returns to gaseous state after depressurization, eliminating pore formation while maintaining material integrity and achieving uniform electroactive layer without leakage issues
Solution Approach 2:
Supercritical CO2 acts as an intermediary solvent that dissolves the electroactive polymer during coating, then is completely removed through phase transition without leaving residual pores. This intermediary approach replaces harmful solvent evaporation with a clean extraction process
2Length of moving object
If the electroactive layer is made thinner to improve flexibility, then the haptic device becomes more adaptable, but the vibration strength decreases
Solution Approach 1:
The patent changes the density parameter of the electroactive layer by using supercritical fluid extraction instead of conventional drying. This increases the density and reduces porosity, allowing thinner layers to maintain sufficient mechanical strength and vibration performance while improving flexibility
3Reliability
If a separate polling process is added to form the electroactive layer, then the β-phase structure is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the coating process and polling process into a single integrated step. The electroactive polymer solution is directly coated onto the substrate and simultaneously forms the β-phase structure through the supercritical fluid extraction process, eliminating the need for separate polling steps while ensuring proper crystal structure
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 method enhances vibration strength, suppresses leakage current and short circuits, and achieves a broad drivable voltage range, resulting in a touch sensitive element with improved reliability and uniform performance.
Implementation Method 1
forming an electroactive layer by heating and pressurizing the electroactive polymer coating layer using a hot press roller
Implementation Method 2
forming an electroactive layer by heating and pressurizing the electroactive polymer coating layer using a hot press roller
Implementation Method 3
a haptic device which uses an electroactive polymer EAP is studied. Since the haptic device which uses the electroactive polymer is thin and flexible
Data Source
AI summary
Provided are a touch sensitive element and a manufacturing method thereof. The manufacturing method for the touch sensitive element according to an embodiment of the present disclosure includes forming an electroactive polymer coating layer by applying an electroactive polymer solution on a substrate; forming an electroactive layer by heating and pressurizing the electroactive polymer coating layer using a hot press roller; and forming an electrode on the electroactive layer.