Continuous analysis methods of plastics are used for production optimization, fault detection and ensuring compliance with environmental regulations. The MCS300P multi-component analyzer by SICK was successfully applied:
Polyvinyl chloride (PVC) is one of the most frequently used plastics and is required for the manufacturing of window frames, cables, etc. During production safety and quality control are very important. Intermediate products for the production of PVC are 1,2-dichloroethane (EDC) and vinyl chloride (VC). When humidity enters through leakages hydrochloric acid is formed causing corrosion of the production facility. In the past, the Karl Fischer titration was applied, which now is replaced by very safe and stable NDIR photometric measurement of water traces in EDC and VC.
The colorless and transparent plastic polymethyl methacrylate (PMMA) is used as a substitute of glass. Safety and process monitoring are very important in production. Hydrocyanic acid (HCN) and acetone are formed as intermediates during production. Their concentration time course in the process is continuously monitored by suitable analyzers; complex laboratory analytics are no longer required.
Polyurethane (PU) produces plastics like construction foam and insulating material. During the process compounds such as benzene, phosgene, ethylene oxide and chlorine are formed. Their concentrations are continuously monitored for process control.
Polytetrafluoroethylene (PTFE) is used for versatile applications in industry and private households due to its low friction and no adhesion surface properties. Continuous monitoring of fluoroethene and other fluorocarbons is used for process control.