In printing, encountering paper with static electricity will cause a lot of trouble. For example, when the whole paper is cut according to the specifications and then printed on the machine, it must be collided. If there is static electricity, under the action of static electricity, the paper will bite firmly, and the air will not penetrate into the paper. To clean the paper, you often need to pull it one by one.
Printing
Due to the electrostatic attraction, the papers are tightly bonded, and the separation nozzles of the automatic separator may be inseparable. The brush is heavy, and it is easy to produce broken or empty sheets; the brush is lightly pressed, which will cause double or multiple sheets. When multiple sheets of paper enter the rubber roller and the impression roller, it will cause boring and crush the rubber Cloth or liner. The paper with static electricity is not natural and smooth to be transported forward on the paper conveying table; it is easy to cause skew and inaccurate positioning when it arrives at the front gauge, which can lead to over-registration and waste.
When receiving paper
Even if the paper with static electricity passes through the imprinting process, it is easy to receive uneven paper, which will cause trouble for the second paper finishing. Static electricity on many objects is caused by friction, and paper charging is also caused by friction. During papermaking, the friction between the paper and the calender, and during printing, the friction between the paper and the rubber cylinder and the impression cylinder ... are all the causes of static electricity. So, how to eliminate paper static electricity?
One of the methods
After the paper enters the factory and enters the warehouse, the storage time is as long as possible. The storage place can be better connected with the printing workshop. The temperature is controlled at 18-25 degrees Celsius, and the relative humidity is controlled at 60-70%. Consistency is achieved, which helps to change the moisture content of the stored paper. The change of paper moisture content is a process of discharging static electricity.
Method two
During the printing process, add a damp towel to the paper receiving part, and fix the wet towel on the pull rod to make the paper contact with the wet towel when passing through. This is a kind of static elimination that has been adopted by many people. Effective simple method.
Method three
When the relative humidity in the workshop is less than 50%, it is easy to generate high static electricity during printing or plate making. Therefore, increasing the relative humidity of the workshop and the moisture content of the paper, especially when the paper is drying, increasing the indoor relative humidity helps Used to eliminate static electricity. To increase the indoor relative humidity, you can use humidity control equipment. If there is no humidity control equipment, you can use the method of sprinkling water on the ground to increase the humidity. The humidity control equipment is mainly a humidifier. Install a centrifugal automatic humidifier on the ceiling or wall of the workshop. When the indoor relative humidity does not meet the requirements, the humidifier will automatically spray mist water vapor to increase the indoor relative humidity. When the indoor relative humidity meets the requirements, it will be The spray will automatically stop.
Method 4
A static eliminator is used to neutralize the charge on the charged body with the ions generated by the static eliminator, so as to achieve the purpose of eliminating static electricity.
There are three types of current static eliminators:
One is the radioactive element remover. It uses the ionization of radioisotopes to ionize air to generate ions to neutralize static electricity on charged objects. One is an automatic discharge static eliminator. It uses conductive fibers, conductive rubber or conductive metal materials to make needle-like thin wire electrodes and make good contact. It uses the electric field of the charged body to generate corona discharge to generate ions to neutralize the charge on the charged body. There is also an externally applied voltage static eliminator. It applies a high voltage to the needle-shaped or thin-line electrode, and generates corona to generate ions.
Method 5
Use antistatic agent (also known as static elimination agent, static elimination agent). The principle of antistatic agents is to give hygroscopic ions on the surface of charged objects such as paper and films, and become hydrophilic, thereby absorbing moisture in the air, reducing resistance, increasing conductivity, and making electrostatic charges difficult to accumulate. Antistatic agents are mainly surfactants, with hydrophilic groups and hydrophobic groups (or polar groups and non-polar groups). Hydrophilic groups have a strong affinity for water and other polar substances, while hydrophobic groups have a strong affinity for oil and other polar substances. Antistatic agents have a wide range of uses in printing, such as making soft rubber rollers that prevent static electricity.
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