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Protective film slitting common problems and solutions Jun 19, 2018

Protective film slitting common problems and solutions

--- Purpose of protective film slitting


1, according to user requirements, provide accurate specifications.

2. When slitting and unwinding, it is possible to re-examine the composite large-volume compound film when the entire process is extruded to see if there are quality problems.

3, can correct the split layer of the composite film or cut off part of the printing and compounding defects, improve product grade rate.

4, can make the finished product get a good winding state.

1. How to do curling in light and thin film roll?


Cause: When slitting a light film, the film curled due to inward curling.

Solution: Increase the radian of the flattening roller and add a small amount of sanitary dusting to the edge of the film.


2. What causes the edge of the thick film?


A curling edge occurs at the edge of the film winding, and the edge of the thick film is curled up so that the edge portion is lifted. The usual reason is that the cutter is too blunt. When the slitting is performed, a stretching phenomenon occurs at the incision, resulting in curling of the edge of the film roll after the rewinding. This causes the occurrence of curling. At this time, the cutting knife should be replaced in time to avoid the occurrence of an alice edge problem. . The tool is installed incorrectly, the take-up speed is too fast, and when the take-up is too tight, it is easy to produce a curling edge.

3. How to deal with the poor uniformity of slitting film end face?


★ Reason 1: Photoelectric tracking is inaccurate when cutting.



1. Photoelectric eye adjustment methods and working conditions are not properly selected, should be adjusted according to operational requirements.

2. The color difference of the tracking line is not obvious, and the contrast of the color difference should be increased.


★ Reason 2: Small tension in winding.


Solution: Increase the winding tension and add a suitable amount of new magnetic powder to the magnetic powder clutch if necessary.


★ Reason 3: The film generates static electricity and adhesion or drift occurs between the films.


Solution: Connect the static conducting device to the slitting device and place one of the antennae on the back of the film roll.

4. How does the vertical stripe on the surface of the film roll up?


Longitudinal stripe means that the surface of the film roll forms a circular linear stripe.




1, in the slitting / rewinding process, a large number of air entrapment and cumulative thickness tolerance is not good is the main reason for the generation of longitudinal stripes, if there is a more serious degree of streak is difficult to eliminate. One of the reasons is that the slitting speed is too fast. In general, vertical streaks and stagger quality problems are most likely to occur at high speeds.


2, the accuracy of the equipment. For equipment with high operating accuracy requirements, after a long period of continuous use, the running accuracy of some components has declined. For large slitters, it is more difficult to ensure running accuracy due to the large operating components. In addition, because the plastic film is a polymer product, its thickness is very thin, and it is more susceptible to damage during processing. Therefore, once the running accuracy is not enough, vertical stripes and other quality problems are likely to occur. Up to now, when replacing equipment components and accessories, care should be taken to use durable, high-precision parts, and certain accuracy must be ensured during installation, otherwise it is difficult to meet the operating needs of the slitter.

5. Why wrinkles appear?


Bottom wrinkles only occur in the length of the beginning of the film winding. The wrinkles and stripes are many and deep, and its production is caused by many factors. For example, in the process parameters, different types of slitting machines, the setting methods, methods, and values of the process parameters are different. The performance of the equipment itself and the intrinsic properties of the film have a great influence on the quality of the slitting and rolling of the film, but the proper process can improve the quality of the longitudinal stripe and the bottom wrinkle. Different equipment and different types of film should adopt proper cutting process. When the equipment status changes, it can also be compensated by process adjustment. However, the process adjustment must be prudent.