The Out of Round of a glass container, Dmax - Dmi, is defined as being the difference between maximum & minimum diameter values measured at precise level of the container. Most non contact measurements today are made by means of a sensor, which calculates the distance between the external surface of the container & the sensor. Theoretically, this principle should give good results if the containers remain extremely stable in the star wheel trough time. The container needs to be referenced in space. As soon as stability is not ensured, the Out of Round presents a significant error, which cannot be corrected or modellised. Such systems cannot guarantee precision & repeatability of measurement better than 0.2-0.4mm, above 180 BPM. In response to the need for precise measurements, French firm SGCC has created the NCO. For more info please email: info@sgcc.com
