B6.4 - Optical Measurement of the Thickness of an Individual Layer in a Plastic Multilayer Compound

W. Weber, D. Plohmann, M. Huber & H. Steigerwald
In plastic multilayer compounds the functionality of the system is often provided by a single functional layer. The materials used for these functional layers often are comparatively expensive, which makes it desirable to have these layers as thin as possible. The pipe extrusion method is the standard manufacturing technique for production of multilayer plastic pipes. To be safe, the functional layer is deposited with significantly higher thickness than actually required. This procedure causes a significantly...