Five Discussions on Methods of Removing Static Electricity from Paper in Printing Process
After the paper enters the printing factory and enters the warehouse, the storage time should be appropriately longer. The storage location can be better connected with the printing workshop. The temperature is 18-25 ° C and the relative humidity is 60% -70%. Making the temperature and humidity of the printing workshop consistent with the paper library is conducive to changing the moisture content of the paper. The change of paper moisture content is a process of discharging static electricity.
2. Paper drying method (humidification method)
Mainly to eliminate static electricity by adjusting the main humidity. When the relative humidity in the workshop is less than 50%, it is easy to generate high static electricity during printing or plate making. Increasing the relative humidity of the workshop and the moisture content of the paper, especially increasing the indoor relative humidity when drying paper, is very effective in eliminating static electricity. The humidity control equipment can be used to increase the indoor relative humidity. When there is no humidity control equipment, sufficient water can be sprinkled on the ground. The humidity control equipment is mainly a humidifier, and a centrifugal automatic humidifier can be installed on the ceiling or wall of the workshop. When the indoor relative humidity does not meet the requirements, the humidifier can automatically spray mist water vapor to increase the indoor relative humidity. After the indoor relative humidity reaches the requirements, the spraying will be automatically stopped.
3. Static Eliminator Method
Use the ions generated by the static eliminator to neutralize the charge on the charged body to achieve the purpose of eliminating static electricity. There are three types of static eliminators: one is the externally applied voltage static eliminator, which applies a high voltage to the needle or thin wire electrodes, and corona discharge generates ions. The transistor static eliminators used in general printing machines belong to this category. The second is a self-discharge static eliminator, which uses conductive fibers, conductive rubber or conductive metal materials as needle-shaped or thin-line electrodes and is well grounded. The electric field of the charged body generates corona discharge to generate ions. And the charge on the charged body; The third is the radioactive element destaticizer, which uses the ionization of radioactive isotopes to ionize the air to generate ions, neutralizing the static electricity on the charged body.
4. Antistatic agent method
Antistatic agents are also called static eliminators or antistatic agents. The principle is to give hygroscopic ions on the surface of charged objects such as paper and films to make them hydrophilic, absorb moisture in the air, reduce resistance, increase conductivity, and make it difficult for static charges to accumulate. Antistatic agents are mainly surfactants, with hydrophilic and hydrophobic groups, or polar and non-polar groups. Hydrophilic groups have a strong affinity for water and other polar materials, while hydrophobic groups have a strong affinity for oil and other less polar objects. Antistatic agents are widely used in printing, such as the use of antistatic agents to make soft rubber rollers that prevent static electricity.
5. Process operation method
During the printing process, a damp towel can be added to the paper receiving part, and the towel dipped in water can be fixed on the pull rod to make the paper eliminate static electricity after contact with the damp towel. Wet towels often.
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