Elastomeric Membrane Health Monitoring via PVDF Sensor
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Solution Overview
Problem
Elastomeric membranes used in industrial forming processes, such as footwear heel manufacturing, are prone to rupture due to wear, excessive pressure and temperature, and lack of maintenance, leading to product quality deviations and increased production costs.
Innovation Solution
The use of flexible piezoelectric sensors made of polyvinylidene fluoride (PVDF) is proposed to detect failures in elastomeric membranes by measuring elasticity changes during multiple work cycles, allowing for the estimation of the membrane's useful life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If commercial strain sensors are used to monitor membrane elasticity, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex commercial strain sensors with a simplified capacitive sensing system. Instead of using traditional mechanical strain gauges or complex sensor assemblies, the invention uses capacitive sensors that measure changes in capacitance caused by membrane deformation. This substitution maintains measurement precision while dramatically reducing device complexity and cost.
Solution Approach 2:
The patent employs thin film capacitive sensors that can be integrated directly into the membrane structure itself. These flexible thin film sensors conform to the membrane's surface and measure elasticity changes without adding significant complexity. The sensors are embedded within or attached to the membrane, allowing for direct measurement while maintaining a simple overall system architecture.
2Device complexity
If traditional measurement methods are used, then device complexity is reduced, but measurement precision and data acquisition speed are insufficient
Solution Approach 1:
The patent replaces traditional mechanical measurement methods with capacitive sensing technology. Instead of using complex mechanical strain gauges or displacement sensors, the invention uses electrical capacitance measurements to detect membrane strain. This substitution provides high measurement precision and fast data acquisition speed while keeping the system relatively simple.
Solution Approach 2:
The patent utilizes the existing pneumatic system in the forming machine to actuate the membrane through inflation and deflation cycles. By controlling the pneumatic pressure, the system subjects the membrane to controlled deformation that enables elasticity measurement. This approach leverages existing infrastructure rather than requiring complex mechanical testing apparatus.
3Productivity
If high pressure and temperature cycles are applied to the membrane, then productivity is improved, but membrane durability deteriorates due to rapid deterioration and cracking
Solution Approach 1:
The patent implements preliminary monitoring of membrane elasticity before rupture occurs. By continuously measuring elasticity changes during pressure and temperature cycles, the system detects early signs of membrane degradation. This preliminary detection allows for preventive maintenance actions to be taken before the membrane fails, thereby maintaining reliability while allowing high-productivity operating cycles to continue.
Solution Approach 2:
The patent establishes a feedback loop where capacitive sensors continuously monitor membrane elasticity and provide real-time data about membrane condition. This feedback information is used to track membrane degradation over time and predict remaining useful life. The feedback mechanism enables proactive maintenance scheduling that prevents rupture while maximizing productive use of the membrane under high pressure and temperature conditions.
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
This method effectively monitors the health condition of elastomeric membranes, enabling predictive maintenance and reducing the risk of membrane rupture, thereby minimizing production interruptions and costs.
Implementation Method 1
The use of flexible piezoelectric sensors made of polyvinylidene fluoride (PVDF) is proposed to detect failures in elastomeric membranes by measuring elasticity changes during multiple work cycles
Data Source
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Figure 3A~3b
AI summary
The invention relates to a method for monitoring the health of elastomeric membranes used in membrane forming processes, in order to predict the remaining useful life of the membrane. The method comprises: attaching at least one PVDF flexible film sensor to an elastomeric membrane used in the forming process by means of an adhesive, and subjecting said membrane to multiple work cycles, in which the membrane is subjected to pressure and to at least one temperature. By applying the method, signals related to a physical quantity are obtained through the PVDF sensor during the work cycles and said measurements are processed to estimate an indicator of the health condition of the membrane.