Electrostatic absorption occurs in printing, and the paper is closely adhered to each other. It is not easy to separate. It is possible that the paper separating suction nozzle of the automatic paper separator can not be separated. When the brush is pressed heavily, it is easy to break and empty; when the brush is pressed lightly, it will form two or more sheets. When more sheets of paper enter between the rubber drum and the impression drum, it will form a stuffy car and crush the rubber cloth or liner. Paper with static electricity is not natural and fluent to be delivered in front of the paper conveyor, and it is easy to form inclination errors and inaccurate positioning when it arrives at the front of the paper conveyor, which results in overprint inaccuracy and waste products.
Paper with static electricity is easy to be irregularly collected even though it passes through the embossing process, which brings trouble to the second paper. Many objects with static electricity are caused by friction, and paper with electricity is also caused by friction. In papermaking, the friction between paper and calender, between paper and rubber drum and impression drum in printing are the causes of static electricity. So, how to eliminate the static electricity of paper?
After the paper is stored in the factory, 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%, which makes the temperature and humidity of the paper store different from that of the printing workshop. This is conducive to changing the moisture content of the paper stored. The change of paper moisture content is a process of releasing static electricity.
Two of the solution
In the process of printing, wet towels are added to the part of paper collecting, and the wet towels are fixed on the pull rod to make the paper contact with the wet towels in the passing time. This is a simple and effective method for eliminating static electricity which has been adopted by many people.
Three of the solution
When the relative humidity in the workshop is less than 50%, it is easy to produce high static electricity in the process of printing or plate making. Therefore, increasing the relative humidity in the workshop and the moisture content of the paper, especially when drying paper, will help eliminate static electricity. To increase indoor relative humidity, humidity control equipment can be used. No humidity control equipment can be used to sprinkle water in the air to humidify. The humidifier is the main humidifier. An ultrasonic atomizing automatic humidifier is installed on the ceiling or wall of the workshop. When the relative humidity of the room does not reach the request, the humidifier will automatically spray the vapour like water vapor, increase the relative humidity of the room, and automatically stop the spray when the relative humidity of the room reaches the request.
Four of the solution
The electrostatic eliminator is used to neutralize the charges on the charged body by the ions generated by the electrostatic eliminator, so as to achieve the purpose of eliminating static electricity.
At present, there are three types of static eliminators:
One is the removal of radioactive elements from electrical appliances. It uses the ionization of radioactive isotopes to ionize air to produce ions to neutralize static electricity on charged bodies. One is an automatic discharge electrostatic eliminator. It is made of conductive fibers, conductive rubber or conductive metal materials into needle-like thin wire electrodes and contacts well. It uses the electric field of the charged body itself to generate corona discharge ions to neutralize the charges on the charged body. There is also an external voltage static eliminator. It generates ions by applying a high voltage to needle or thin wire electrodes.
Five of the solution
Use antistatic agents (also known as electrostatic eliminators, degaussing agents). The principle of antistatic agent is to give paper, film and other charged surface hygroscopicity ions, and become hydrophilic, thus absorbing moisture in the air, reducing resistance, increasing conductivity, so that static charge is not easy to accumulate. Antistatic agents are mainly surfactants with hydrophilic and hydrophobic groups (or polar and non-polar groups). Hydrophilic groups have strong affinity to water and other polar substances, while hydrophobic groups have strong affinity to oil and other substances with smaller polarity. Antistatic agents are widely used in printing, such as making soft cots to avoid static electricity and so on.
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