Causes of longitudinal streaks in slit film-technical knowledge

The source of the longitudinal streaks in the slit film: direct sales from the protective film factory Release time: 2019-02-28 Click: 5934 The slitting result of the PET film is a comprehensive reflection of multiple quality factors, and the various related factors involved are also The mutual influence makes the quality problem in slitting more complicated. Therefore, to control the cutting quality, on the one hand, it is necessary to control and stabilize the quality of the large-axis film roll and the raw and auxiliary materials as much as possible; on the other hand, it is necessary to adjust the cutting process in time according to the actual situation to improve the cutting quality as much as possible. . Different types of films have different properties, and there are also certain differences in slitting methods. In the slitting/rewinding process, a large amount of air entrapment and poor accumulated thickness tolerance are the main causes of longitudinal streaks, and once more serious streaks appear, it is difficult to eliminate them. One of the reasons is that the cutting speed is too fast. Generally speaking, quality problems such as longitudinal streaks and staggered layers are most likely to occur at high speeds. The second is the operating accuracy of the equipment. For equipment that requires high operating accuracy, after a long period of continuous use, the operating accuracy of some parts has been reduced. For a large slitting machine, it is more difficult to ensure the accuracy of the operation due to the large operating parts. And because PET film is a polymer product, its thickness is very thin, and it is more susceptible to damage during processing, so once the running accuracy is not enough, it is easy to produce quality problems such as longitudinal stripes. For this reason, you should be cautious when replacing equipment parts and accessories. It is advisable to choose durable and high-precision parts, and you must ensure a certain accuracy during installation, otherwise it will be difficult to meet the operational needs of the slitting machine.