The harm of static electricity in the printing of light powder

The static electricity in printing will be harmful. The manufacturer of optical powder reminds everyone not to think that static electricity is irrelevant. You may not know much about it when you are not in contact with it. In the aircraft body and air, water vapor, dust, etc. When the particles are rubbed, the aircraft will be charged. If no measures are taken, it will seriously interfere with the normal operation of the aircraft radio equipment, making the aircraft into scorpions and scorpions. The same static electricity in printing also affects the quality of the print. Let's take a look at the manufacturer of light powder.

1 electrostatic hazard

1) Affect the printing quality of products

If the surface of the substrate is electrostatically charged, they will adsorb paper dust or dust and impurities floating in the air, thus affecting the transfer of ink, and “flowers and dots” appear on the printed products, resulting in the quality of printed products. decline.

If the ink is electrostatically charged, if it is discharged during the movement, it may appear as "electrostatic ink spots" on the printed product. It seems that the ink has poor fluidity and uneven ink application, which is often the case in layered printing. In solid printing, if charged ink is discharged at the edge of the line on the print, it is easy to have "ink whiskers" on the edge of the line.

2) affect production safety

In the printing process, high-speed friction generates high static electricity. When static electricity accumulates to a certain extent, it is easy to cause air discharge, resulting in electric shock or fire. When the manufacturer of the optical powder indicates that the voltage is high, the charged ink may cause the ink or solvent to catch fire, or the electric shock to the staff through the ink directly threatens the personal safety of the operator.

2 Electrostatic generation mechanism

The main cause of static electricity is the presence of friction. The manufacturer of optical powders knows that when two materials are in contact and rapidly separated, one of the materials with strong electron-adsorbing ability transfers electrons to their surface, and the surface of the material that obtains electrons exhibits a negative charge, while the other The surface of the material is positively charged due to the loss of electrons. The main factors for generating static electricity are as follows.

1) Material properties

Including the chemical composition of the material, the internal structure of the material, the stress characteristics, material shape and conductivity.

If the material is a conductor, the charge is free to move on its surface, and the charge tends to be evenly distributed throughout its surface rather than staying at a local location where the charge is generated. This charge can only produce a lower voltage, and any part of the conductive material that comes into contact with the ground can immediately transfer the charge on the material to the ground. The insulating material is different from the conductor material. For printing materials such as paper and plastic film, static electricity generates a high voltage and cannot be eliminated by grounding.

2) Ambient conditions

Including the composition of the contact material gas, pressure, temperature, humidity, and the like.

3) Mechanical action

It includes the type, time, area, and separation speed of the two materials, the nature of the force, and so on. In general, the tighter the contact between the two materials or the faster the separation, the greater the static generated.