Measurement of a Blown Foil Extrusion Line In a blown foil extrusion line, as a consequence of misaligned rolls, one side of the web was extended compared to the other side, and a so called “long side” occurred. Thus the winding was asymmetric and the product showed folds. As this lack of product quality affected the following production steps, the waste production was very high. The traditional way of measurement, for example by enlacement, works only on the same level. For the measurement over several levels it is very hard to place the measuring tape around the rolls. For optics it is also very hard to access the rolls in higher levels as they are behind housings or in different floors. Due to the insufficiency of traditional systems the production manager chose PARALIGN® as an alternative. PARALIGN® requires no mechanical connection or line of sight between the rolls. In only a few hours the machine was measured completely. After measuring all rolls the misalignments were corrected and verified by a second measurement on the same day. The winding unit was chosen as a reference. One week after the service the customer confirmed that the folds production was reduced to a minimum. A clear quality improvement was seen after the PARALIGN® service. The following page shows the PARALIGN® protocol before alignment. In a detailed view the offsets of the rolls on top of the machine are shown. The shown protocol is not a particular case on especially this machine. Such offsets are regularly found by our PARALIGN® services. Advantages of PARALIGN® in the blown foil extrusion line Cost savings less waste higher machine availability Are nozzles well aligned? ROTALIGN® Ultra Laser alignment with the better partner Contact us for further information reduction in web breaks Increased quality decrease in folds uniform thickness profile

The PARALIGN® protocols Detailed view Roll face length: 2000 mm Your point of view is the operator side of the machine, represented in green. The machine side is represented in red. The blue marked winding unit is chosen as reference roll, it is perpendicular to the drawing. For further information please see www.paralign.info PRÜFTECHNIK Alignment Systems GmbH Freisinger Str. 34 85737 Ismaning Germany Tel +49 89 99616-0 Fax +49 89 99616-100 [email protected] www.pruftechnik.com A member of the PRÜFTECHNIK Group ROTALIGN® Ultra and PARALIGN® are registered trademarks of PRÜFTECHNIK Dieter...