Printing is only a test of plate-making quality. However, on the premise of stable plate quality, because the printers are not careful, they can not get the ideal printed matter, on the contrary, it will lead to greater waste and produce inferior or waste products.
Before batch printing, the printing screen should be fixed and put in the ink for trial printing, and the levels of layout, ink color, ink thickness, specifications, registration accuracy and so on should be checked. If the alignment accuracy is poor, adjustments can be made according to the fine-tuning knob in front of the frame; if the color of the ink is not correct, check whether the wrong ink is used and replace it immediately; if the ink is not good, the solvent can be used to wipe the printing plate and text parts, so that the ink permeability and the wettability of the substrate can be improved to a certain extent; if the ink color is not correct, check whether the wrong ink is used and replace it immediately. If there are great differences in the level of reconciliation, the printing screen should be replaced immediately. In the process of printing, the following points must be paid attention to.
(1) Watch the rules diligently. Because the plate frame keeps moving back and forth during printing, the plate and the frame are collided and vibrated in the round trip operation. A small displacement occurs between the plate and the frame, which results in imprecise overprinting and affects the appearance quality of the product. Therefore, we should be diligent in observing the rules, discovering them in time and adjusting them in time.
(2) Examine samples frequently. If ink deficiency is found in printed matter, the screen plate should be wiped with clean cotton cloth immediately. This situation is mostly due to the sticking of crushed plastic film or ink crust on the printing plate to dry and clog the screen plate. If the ink color is uneven or light, it may be that the ink viscosity is too high. Solvent should be stopped immediately to dilute the ink viscosity. At the same time, gasoline should be used to wipe the graphic and textual parts of the layout to prevent ink penetration or blocking, so as to facilitate continuous work.
(3) The stockpiling of semi-finished products should be neat. In the process of stacking semi-finished products, the two sides of paper must be sagged and stacked. Otherwise, due to the gravity of the paper itself, it will form an upward bow, and the two sides of the paper will be warped and uneven, which will make the paper difficult to transfer and often lead to tension breakage. When the stack is uneven, it can be padded with cardboard. At the same time, the height of the stack should be adjusted by the adjusting knob of the paper splitting mechanism so that the paper can be transferred smoothly and the printing process can be carried out smoothly.