Packaging and printing static, eliminate and testing technology we all know, the printing surface is carried out, the electrostatic phenomenon mainly in the surface, a very close relationship between the two. Printing process due to the frequent impact and friction and contact between the different substances, the result is almost all objects involved in the printing process are charged with static electricity. However, the impact caused by static electricity in the packaging and printing process and did not get enough attention, the author of many years of work experience to explore below. An electrostatic hazards 1 □ affect product quality first printed substrate surface is charged, such as paper, polyethylene, polypropylene, cellophane, etc., they will absorb the metal or paper floating in the air, a lot of dust and impurities, thus affecting the ink transfer, a "flower, point" in the printed materials, resulting in printing quality. Followed charged ink, ink charged if the discharge on the move, it may be a "static ink spots" on the printed product, looks like ink, poor mobility, uneven ink-like, often at the level of thin printing This occurs. In the field of printing, if the charged ink on a printing edge of the discharge lines, it is easy to occur at the edges "of the ink to be." 2 □ affect safety in the printing process due to the high-speed friction, electrostatic separation will produce a high, when static electricity can easily lead to the accumulation of air discharge, resulting in electric shock or fire. When a high voltage is charged ink may cause ink, solvent fire, or electric shock through the ink of staff, a direct threat to the safety of operating personnel. Second, the generation of static electricity generated by the main mechanism of static electricity is friction exists. When both the contact and quickly separate solid material, wherein a material having a large adsorption capacity of electrons leaving the electron transfer to the surface of the material, to obtain electronic surface exhibits a negative charge, while the other surface because of the loss of electrons and positively charge. Chemistry major factor 1 □ generate static intrinsic material properties, including material composition, internal structure of the material, the stress-strain mechanical properties, electrical conductivity and other material and shape. Electrostatic conductive material has a dual role. First, if the material is a conductor, the charge on the surface thereof is made to move, the charge on its entire surface is free distribution tends, instead of staying in the local charge-generating position. This charge distribution on the surface can cause a lower voltage. Any portion of the conductive material in contact with the ground as soon as the charge on the material to the ground. The conductor insulation material and different printing materials, like most of paper, plastic film, etc., resulting in the formation of a high voltage static electricity can not be eliminated through the ground. 2 □ ambient conditions include a contact object (material) and the composition of the ambient gas pressure, temperature and the like. 3 □ circumstances including the type of mechanical action of the two materials in contact, the contact time, contact area, separation speed and material properties of the force and the like. In general, the closer the two materials in contact or separated faster, static electricity will be. 4 □ materials with different types of friction between the materials will produce different electrostatic polarity. Different materials with different static strength. Third, the printing process, methods and measures 1 □ static elimination of chemical elimination of chemical elimination method is generally in the substrates coated with an antistatic agent, so that the conductive substrates, become the absolute level slightly conductive material. Chemical elimination method of application is very confined, when added to the chemical composition of printing paper when the paper, the paper is likely to have poor quality raw e.g., such as the reduced paper strength, adhesion, tightness, tension, etc., so the chemical elimination laws generally do not use. Case 2 □ physical elimination of physical elimination method that does not change the material properties of the use of the inherent characteristics of the method to eliminate static electricity, is now one of the most important industrial production methods. (1) "ground" elimination method, which is the easiest way. Is to use a metal conductor will eliminate static objects connected with the earth, and the earth so that other potential, the charge will leak through the large ground, but this method for insulation almost no effect. (2) elimination of printed materials humidity control surface resistance decreases with increasing the relative humidity of air, and therefore, increase the relative humidity of the air, they can raise the conductivity of the paper surface, the acceleration of charge leakage. Pressroom suitable environmental conditions: temperature is about 20 ℃, the ambient relative humidity charged body to more than 70%, can be used as static security measures. (3) static elimination equipment introduction and selection principles commonly used printers have induction static eliminator, high-voltage corona discharge, ionic flow type static eliminator and several radioisotopes. Two former of which as cheap, easy to install and does not exist atomic radiation, etc. to get more widely used. Now as follows: induction static eliminator bars: the induction static elimination brush, the principle is: When consumer appliances charged body near the tip, the tip can be induced in the polar and charged on the electrostatic charge of opposite polarity, and in the vicinity of the tip of the formation of a strong electric field, which after the air ionization, producing positive and negative ions move to the charged bodies and consumer appliances were at the tip of the electric field, thereby neutralize static electricity. Such method uses gradually reduced. High-voltage discharge type static eliminator: structured into electronic and high-voltage transformer, according to the discharge polarity can be divided into unipolar and bipolar, unipolar static eliminator for a charge only have a role in bipolar to eliminate any static electricity. Also in the printing process can be anti-static brush-type high-voltage discharge and a combination of the two can be effectively and completely eliminate static electricity. Jinan Derrick has introduced 969-type power supply with DJ62 highly efficient static elimination bar due to the effect of strong static elimination, in packaging and printing industry has been widely used. There is a risk of explosion in the area, the use of high-voltage corona discharge and ion flow is static eliminator, hazardous area classification must be based, medium-level and group, use explosion-proof static eliminator. Induction and high voltage corona discharge type static eliminator discharge electrode length should be greater than the width of a charged body 10 ~ 15cm; ion flow static elimination ion nozzle type and number of devices should be determined according to the possible installation distance and charged body width. Static eliminator should be based on the level of electrostatic potential of the object, eliminating requirements, operating characteristics, explosion hazardous area rating, medium-level and group selection. Static eliminator selection principle installation location: easy process operation; eliminate electrostatic effect; brushing solvent immediately subsequent parts; avoid metal background. Fourth, the purpose of the test 1 □ static packaging printing electrostatic detection is to analyze the degree of harm, research precautionary measures to determine the effect of static elimination. Must designate a person responsible for the anti-static shoes, conductive shoes, anti-static clothing and various posts regular static test, the test results shall be reported to higher authorities prepared for the archives. Category 2 □ electrostatic detection project: the use of new raw materials when the object with a static performance prediction: the actual production process, the body charged with static condition is detected; static security measures to use to determine the effect of detection. (1) an object with a static performance prediction are as follows: surface resistivity. Using high impedance meter or high resistance measurements, the range to 10 ~ 10Ω appropriate. Test items (2) the actual production process the body charged with static electricity situation as follows: Determination of the electrostatic potential of the charged electrostatic potential measurement meter maximum range is appropriate to 100kV accuracy of 5 □ 0 级; space surrounding air temperature and relative humidity measured; a conductive ground face measured resistance value; Determination charged body running speed; measuring combustible gas concentration. Derek company which introduced ACL-350 is the world's smallest digital compact non-contact electrostatic meter. The meter can measure the surface of the static voltage and static voltage polarity. The table is simple to operate, with a measure to keep the button and the set button, the application is quite extensive. (3) determine the effect of security measures using the same test items (2) electrostatic potential measuring range of the instrument to 0 ~ 10kV appropriate, precision instruments for 5 □ 0 level detection point but must be selected later in a static-safe device. Five measures to prevent electrostatic damage the packaging and printing workshop recommend measures to prevent electrostatic hazards from the following considerations: Where electrostatic hazards of processes, equipment options, you must use the appropriate static security measures; the area surrounding explosive gases may occur, ventilation measures must be strengthened, so that the concentration below the lower explosive limit control; static security measures taken after the electrostatic potential of the insulator should be controlled below the permissible value; insulator to prevent static electricity caused by electric shock to the operator of the occasion, the electrostatic potential of the insulator should be controlled 10kV following; may cause secondary accidents where the operator when the static electric shock, in addition to electrostatic potential 10kV insulator should be controlled below, the right equipment or device shall take appropriate security measures. Where there is an explosion and fire hazard area, the operator must wear anti-static shoes or conductive shoes, anti-static clothing. Operating area should be laid conductive ground face conductive ground resistance should be less than 10Ω, and must always maintain its conductivity, non-operating personnel wearing synthetic clothes (except for anti-static solution has been used regularly treated clothes) into the above-mentioned area prohibited undress in the above areas. In short, the packaging and printing industry workers should electrostatic production process to give sufficient attention to ensure safe production. This article from Dongguan Hubei and Chongqing Paper, Quoted (China Paper Net) thanked the selfless sharing your valuable web! Hubei and Chongqing Changan Town, Dongguan Paper specializes in sales of various types of packaging paper, such as kraft paper, linerboard, kraft white, black kraft paper, food packaging, kraft paper, coated linerboard, white top linerboard, kraft liner board; clothing and garment paper: copy paper, oil, wax paper, Mark-paper, the Philippine Aberdeen paper, vacuum film, etc; 

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