胶印常见故障（Offset printing common faults）.docVIP

胶印常见故障（Offset printing common faults） Identification of moisture is not large, we should first look at the layout of moisture. This point must be based on the experience of the operator. Generally speaking, the moisture content is large, the page reflects the light intensity, the side view is brighter; on the contrary, the page reflects the light intensity, and the side view is dim; if the moisture is too large, it can also be observed from the following points: (1) use cardboard roller shovel in ink, there will be small drops of card; (2) water roll on small drops of water, the phenomenon of group or deinking roller drops; (3) when the water is shut or stopped for a long time, the moisture of the layout has not dried up yet; (4) dot blot ink empty, dull; (5) there is water or water at the end of rubber roller. Seven. Control water balance Ink and water are not absolutely incompatible. In the actual printing process, the ink and water through the roller and rubber roller extrusion, will be fused together, so that the ink emulsion. The emulsion state ink has two kinds: when the water ink hours, forming oil in water; when the water Xiaomo large, the formation of oil in water. In the offset printing process, ink balance master degree and the normal transfer, the ink imprinting depth, color accuracy, print dry and dirty has a very close relationship. In general, water, make the ink emulsification, shallow water ink; small, blank layout of the part will produce adhesion of inks, dirt. Therefore, offset control is good, ink balance is the key to printing. Eight. Control ink and water balance To control ink and water balance, we should master the principle of less water and thicker ink. Water less, refers to the layout of the blank part of non stick dirty as the premise; ink thick, refers to the establishment of a small amount of water on the basis of appropriate increase in ink. In the printing process, the most taboo point is that the water is big and big. Considering th