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Why Does PE Stretch Film Appear Static?

During the use of PE stretch film, sometimes static electricity will appear. In fact, the static phenomenon is not serious and it is good. It is sometimes dangerous, so we try to avoid this kind of phenomenon. In order to avoid it better, let's briefly introduce the reason for the static electricity, so I hope you can pay attention in time when you use it next time.

1) Static electricity generated during production

Because the particles rub against each other, the friction between the melt and the die, and the friction of the guide rolls during film formation and winding, resulting in static electricity generated at the time of shipment. Therefore, an antistatic agent is added during the production of the PE stretch film to eliminate this part of the static electricity. It should be said that this effect is still very good. Antistatic agents are surfactants in which the molecule contains polar hydrophilic groups and non-polar oleophilic groups. The lipophilic group has a certain compatibility with the plastic, and the hydrophilic group can ionize or adsorb the moisture in the air, forming a thin conductive layer on the surface thereof for leaking electric charge, thereby achieving the purpose of eliminating static electricity.

2) Static electricity generated during printing, compounding, slitting and bag making

It generates static electricity due to the friction of the PE stretch film and the guide roller, the friction of the film running at high speed, and the dry air. This part of the static electricity has a great impact on production, and if it can not be effectively eliminated, it will have a great impact on the post-processing process. In general, it is effective to use a superconducting electrostatic brush (contact elimination), which is a method of contacting a film, and the generated static electricity is derived by grounding the brush with a low resistance (1 m wide resistance less than 1). solve this problem. It is also possible to use an ion generator in which the generated ions are blown onto the film in the form of wind (non-contact type). However, in actual operation, the ionic gas can eliminate the static electricity it carries, and it will also carry a part of the air ions in the air to enter the winding.

3) Static electricity generated by the finished film on the automatic packaging machine

The friction between the finished film and the equipment guide roller, and the PE stretch film itself are not completely eliminated by static electricity. The automatic packaging is difficult and the required contents are sensitive to static electricity. In this case, the above method can also be used to eliminate static electricity. An effective method is also eliminated by using a superconducting electrostatic brush.

PE stretch film has different parts of static phenomenon, the reasons are different, and the solution will be different. Therefore, for different situations, when we deal with such problems, we must make decisions based on actual conditions.