Five ways to eliminate paper static electricity in

Five ways to eliminate paper static electricity in the printing process

in printing, when you encounter paper with static electricity, it will bring a lot of trouble. For example, when the whole paper is cut according to the specifications, the paper must be aligned before being printed on the machine. If there is static electricity, under the action of static electricity, the paper will be firmly bitten by the paper, and the air will be difficult to penetrate into the paper. To tidy the paper, you often need to open it one by one with your hands

in printing

due to electrostatic attraction, the paper fits closely, and the paper separation suction nozzle of the automatic paper separation machine may not be separated. If the brush is pressed heavily, it is easy to break and empty; If the brush is pressed lightly, it will cause two or more sheets of paper, and multiple sheets of paper will enter between the rubber drum and the embossing drum, which will cause stuffy cars and crush the blanket or liner. The paper with static electricity is unnatural and unsmooth to be transported forward at the paper feeding table; When arriving at the front gauge, it is easy to cause skew and incorrect positioning, which leads to the overprint unable to register and produce waste products

when receiving paper

even if the paper with static electricity goes through the embossing process, it is easy to receive paper irregularly, causing trouble for the second time. Many objects with static electricity are caused by friction, and the electrification of paper is also caused by friction. When making paper, the friction between paper and calender, when printing, the friction between paper and rubber roller, imprint roller... Are all the reasons for static electricity. So, how to eliminate paper static electricity

one of the methods

after entering the factory and warehousing, the storage time should be as long as possible, and the storage place can be better connected with the printing workshop. The temperature should be controlled at 18 ~ 25 degrees Celsius, and the relative humidity should be controlled at 60 ~ 70%, so that the temperature and humidity of the paper warehouse are consistent with that of the printing workshop, which is conducive to changing the moisture content of the stored paper. The change of paper moisture content is a process of releasing static electricity

method 2

in the printing process, add a wet towel to the paper receiving part, fix the wet towel on the pull rod, and make the paper contact with the wet towel when passing. This is a simple and effective way to eliminate static electricity, which has been adopted by many people

method 3

when the relative humidity in the workshop is less than 50%, it is easy to generate high static electricity in the process of printing or plate making. Therefore, increasing the relative humidity in the workshop and the water content of the paper, especially when drying the paper, helps to eliminate static electricity. Humidity control equipment can be used to increase indoor relative humidity. If there is no humidity control equipment, it can be used to spray water on the ground to increase humidity. Humidifier is the main 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 like water vapor to increase the indoor relative humidity. When the indoor relative humidity meets the requirements, it will automatically stop spray

method 4

the electrostatic eliminator is used to neutralize the charge on the charged body with the ions generated by the electrostatic eliminator, so as to achieve the purpose of eliminating static electricity

at present, there are three types of electrostatic eliminators:

one is a radioactive element eliminator. It uses the ionization of radioisotopes to ionize the air to generate ions to neutralize the static electricity on the charged body. One is automatic discharge electrostatic eliminator. It uses conductive fiber, conductive rubber or conductive metal materials to make needle like thin wire electrodes and make good contact, and 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 a kind of electrostatic eliminator with external applied voltage, which actually does not have a big gap. It applies high voltage to the needle or thin wire electrode to produce corona and generate ions

method 5

antistatic agents (also known as electrostatic eliminators and de electrifying agents) are used. The principle of antistatic agent is to give the surface of paper, film and other charged bodies moisture absorption, high-precision strain gauge force sensing force measuring ions, and become hydrophilic, so as to absorb moisture in the air, reduce resistance, increase conductivity, and make static charges not easy to accumulate. Antistatic agents are mainly surfactants, including hydrophilic and hydrophobic groups (or polar and nonpolar groups). The hydrophilic group has strong affinity for substances with large polarity such as water. The new material industry in the park strives to achieve an annual industrial added value of 4billion yuan, and the hydrophobic group has strong affinity for substances with small polarity such as oil. Antistatic agents are widely used in 3. Accurately measuring the length, width and height of each position with a square, such as making soft rubber rollers to prevent static electricity, etc