Development of a Volume Flow Control of ELMET TOP Dosing Systems

Abstract

This thesis presents the development and evaluation of a closed-loop volume flow control system for two-component dosing using Liquid Silicone Rubber. The goal was to enable precise, stable, and material-adaptive flow regulation across a wide range of viscosities and flow rates. Implemented in the SIGMATEK LASAL Class 2 environment, the system uses a modular Proportional–Integral–Derivative controller with a pre-control offset to improve startup behaviour. Tests were conducted with viscosities between 346 and 941 Pa*s and flow rates from 0,2 to 4,5 cm³/s. A polynomial interpolation model allows automatic gain selection without manual tuning. Results showed high control accuracy, with long-term deviations typically below 2%. External mass tracking confirmed the correctness of internal volume measurement. Dual dosing tests revealed flow asymmetries due to viscosity differences, emphasising the need for material-specific control logic. The presented concept offers reliable volume regulation for pneumatic dosing systems and provides a solid foundation for future adaptive or model-based extensions.

Date of Award	2025
Original language	English
Supervisor	Robert Merwa (Supervisor)