Book printing prepress preparation:
After the preparatory work for the pre-printing test is completed, the paper can be loaded, loaded, and commissioned. During the start-up operation, the paper-feeding mechanism, the delivery mechanism, the inking device, the water delivery device, and the printing pressure must be adjusted to ensure that the paper feeding is smooth, the water supply volume and the ink supply amount are moderate, and the printing pressure is suitable. Produce high quality prints. After the above work is ready, the machine will be opened for a while, so that the amount of ink to be supplied and the amount of water supply are moderate and uniform. After that, a certain amount of overprinted paper is put on the paper feeding table for trial printing. If it is multi-color printing or multi-color printing, registration adjustment work is also needed to determine whether the layout is appropriate, whether the graphic and text are skewed, and whether the sky, the foot, the size and the direction of the left and right are registered (generally, the registration is made with the rules). adjust).
After the registration operation is completed, a trial printing is started, a few samples are printed, and a quality inspection is performed. The ink modulating work includes the preparation of special inks, adding some auxiliaries to conventional inks, and the like. If the viscosity of the ink is not suitable, it should be added with the ink of increasing or decreasing the viscosity; the ink is not good for the dry bath and can be added with a dry bathing agent. Adding various additives must be based on the conditions of the process, equipment, paper, and ambient temperature, and the amount should be appropriate. Inspection of printing plates includes: inspection of printing plate types, color types, thickness detection of printing plates, inspection of the size of the printing plate, inspection of the rules, inspection of the depth of printing plates, and the quality of the printing and printing images. Damage, scratches, etc. Debugging of printing pressure: According to the factors such as the thickness of the printing plate, the paper specification, the thickness of the blanket, the thickness of the lining material, the requirements of the printing process, etc., the proper roller lining is selected so that the printing pressure meets the requirements of the printing process and quality.
