Extrusion International USA 5-2019

49 Extrusion International 5/2019 stant after the start-up of the device and the operation point has been reached. There is no warming up phase or a dependence on the prod- uct temperature, no coupling media is needed, nor any requirements re- for a non-destructive look into and through a product. Furthermore, it can be differentiated between mis- cellaneous materials that vary in their absorption or attenuation of X-rays. The absorption of a material is de- fined by its composition, its density and hardness of the used X-rays. Advantages of X-ray technology In particular, when comparing X-ray technology to mere optical meth- ods, it provides several advantages. Due to its low density, gases that arise during the production process, such as smoke or steam, do not in- terfere with the measurement. The temperature of the object to be measured is also irrelevant for the attenuation and, thus, for the mea- suring result. For X-ray measuring technology, the measuring result is stable and con- garding their quality. A correction or recalibration of the measuring values during production is also not required – neither manually, nor by including secondary values such as a gravimetric measurement. This is a Picture 3: Determinationof theminimumwall thickness: Thewall thickness under 45 degrees fromthe outside (reddotted line) is larger than the actual minimumwall thickness (yellowsolid line)