Dry goods 丨 The purpose of protecting the protective film and the common problem
Why is the protective film to be cut? Today, the purpose of protecting the film, and the common problems that protect the membrane are all discussed.
The purpose of the protective film
1 Provide precise specifications according to user requirements;
2 When the scroll is separated, the multi-volume composite film of the entire upper process extrusion composite can be checked, see if there is a quality problem;
3 can correct the missed film of the composite film or cut off partial printing and composite defects, improve the level rate of the product;
4, you can get a good winding state.
What should I do if the slitting film roll end face is poor?
There are about 3 reasons for this problem.
Cause 1: The light-electricity tracking is not accurate.
Workaround:
1. The optical eye adjustment method and the working status are not correct, and the operation procedure should be re-adjusted.
2. The tracking line color is not obvious, and the color difference should be increased.
Cause 2: The tension is small.
Workaround: Increase the winding force, and add an appropriate amount of new magnetic powder to the magnetic powder clutch when necessary.
Cause 3: The film generates an electrostatic accumulation and a film between the films.
Workaround: Access the static electrostatic apparatus on the divided device, and one of the contacts to the back of the film
How is the longitudinal stripe of a film roll?
The longitudinal striped finger surface forms a rim stripe. This phenomenon is caused by:
1. A large amount of air inchelation and cumulative thickness in the dividing / rewinding process is poor to produce longitudinal stripes, and once the degree of stripes are more severe, it is difficult to eliminate. One of the reasons is that the slitting speed is too fast. In general, longitudinal stripes and misalignment quality problems are most likely to occur at high speeds.
2, the operating accuracy of the device. For equipment with higher operating precision, after a long period of continuous use, some parts of the components have declined. For large slitting machines, due to the large running components, it is more difficult to ensure operational accuracy. Also because the plastic film belongs to a high molecular product, it is very thick and thin, and the processing is more susceptible to damage, so once the operating accuracy is not enough, longitudinal stripes are prone to quality problems. To this end, at the replacement device component, the accessory should be cautious, it is appropriate to use parts with durable, operating precision, and must also ensure a certain accuracy when installing, otherwise it is difficult to meet the operational needs of the slitting machine.
Why do you have a crunch?
On only one length of the film retrievable starting, it is manifested as a wrinkles and stripes, which produces a variety of factors. As in process parameters, different types of slitting machines, process parameters are set, and the number is different. The performance of the device itself and the inner performance of the film have a great influence on the quality of the film slitting strip, but the appropriate process can improve the quality problems such as longitudinal stripes and underwritten. Thin films of different devices and different types of specifications can be used to compensate for process adjustment when they change, and process adjustment must be careful.
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