Correct use and maintenance of printing rubber rollers

　　1. It is necessary to keep the surface of the rubber roller clean to improve its viscosity and achieve good ink transfer and ink distribution.

　　In the printing process, in order to achieve uniform ink transfer and ink distribution, the surface of the colloid must maintain a certain viscosity. However, because the rubber roller has been used for a long time, its appearance will be lost with the loss of moisture, and the adhesion function will be reduced. In addition, due to paper dust, paper wool and other properties, it affects the transfer of ink, and it is easy to produce uneven ink distribution. In order to make the rubber roller maintain a certain viscosity, the ink should be prevented from drying out too quickly and the rubber roller will be skinned. Generally speaking, the amount of resin ink plus white drying oil should not exceed 5%; the oil type ink plus white drying oil should not exceed 10%; the amount of red drying oil should be about 2%, so as to avoid the ink skin of the rubber roller affecting the printing quality. In order to maintain the cleanliness of the rubber roller, the rubber roller should be cleaned as appropriate, but the impurities and paper dust on the colloid should be removed to improve the ink transfer function. In the offset printing operation, ink emulsification is necessary, but the ink emulsification caused by "big water and big ink" will form a hydrophilic foundation on the smooth rubber roller, which will deink the rubber roller, and the fountain solution will corrode the rubber surface. Therefore, under the premise of not sticking and dirty, the less fountain solution should be, the better.

　　Second, it is necessary to ensure the proper orientation of the rubber roller on the printing press at high speed to avoid damage and poor ink distribution caused by improper use.

　　Whether the position of the rubber roller is suitable or not is directly related to the uniformity of ink transfer and brushing, and it is also related to the durability of the rubber roller. Therefore, the contact pressure between the ink rollers should be kept uniform and moderate. The touch pressure between the ink roller and the ink roller is too large. On the one hand, the rubber roller will be deformed under pressure, and the colloid will easily expand due to excessive heat distribution. The ink is easily thinned when heated, which affects the quality of the printing ink; on the other hand, it is easy to damage the roller head (bearing) or the shaft hole. If the height adjustment of the inking roller is uncomfortable, if it is adjusted too high, it will cause uneven ink distribution. If it is adjusted too low, it will easily scratch the colloid and increase the wear of the printing plate. Therefore, the inking roller should be adjusted to be in balance with the printing plate layout to ensure the uniformity of ink on the entire layout. When the contact between the ink roller and the printing plate is high, a strip of paper with strong toughness of about 40g can generally be placed on the printing plate. When the inking roller is rolled up, the strip of paper can be pulled to have a sense of pressure resistance.