1. Adjust the printing pressure. In the offset printing process, every two adjacent rollers among the three rollers of printing plate, rubber and impression are in contact and squeezed with each other to perform transfer printing. In order to achieve normal ink transfer on the printing paper and truly reproduce the continuous-tone text, lines, images, and half-tone dots in the graphics and text parts, these imprints must be added with the necessary printing pressure in addition to the surface contact between the two rollers. effect. The severity of the printing pressure and the accuracy of the adjustment control will directly determine the size and depth of ink color transfer and printing dot reproduction. It is necessary to adjust the center distance between the impression cylinder and the rubber cylinder during self-adhesive printing. The center distance of the cylinder can be increased by about 0.2 to 0.4 mm. If the paper changes from thick to thin, the reduced thickness, which is the thickness of the lining removed from the printing plate liner, should be added to the rubber cylinder; if the paper changes from thin to thick during printing, the thickness of the lining removed from the printing plate liner should be added to the rubber cylinder. Subtract a certain thickness from the thickness and add the corresponding thickness to the lining of the plate cylinder.

When loading the plate, it must be pressed tightly to prevent relative slippage during printing. In actual production, the ideal printing pressure is generally controlled at about 0.15-0.25mm. The ideal printing pressure must be emphasized. It means that under a certain compression and deformation of the printing surface, the minimum pressure should be used to ensure that the imprint of the graphics and text parts of the printing plate is strong enough on the paper and the dots are clear and complete.

2. When printing self-adhesive, pay attention to the adjustment of the paper feeding part. The air volume of the paper suction nozzle and paper blowing nozzle in the paper feeding part should be adjusted accordingly.

3. The paper separating suction nozzle and paper feeding suction nozzle should be replaced with larger diameter and thicker rubber rings to achieve smooth paper feeding and the paper feed roller does not swing.

4. Since the self-adhesive printing is the thickness of two layers of coated paper, the thickness of the paper should pay attention to the gap between the double-sheet controller and the corresponding increase. The paper pressing tongue of the side gauge and the front gauge and the input The distance between cardboards should be increased.

5. The distance between the paper feeding dog pad and the surface of the impression roller, as well as the paper feeding dog pad and the feeding paper board, should be increased, and the distance should be kept approximately equal to the paper thickness plus 0.3mm. 1. Self-adhesive printing products have a full page and a solid surface, as well as text, lines, and patterns. For example, for printing products such as wine boxes and pharmaceutical trademarks, it is best to first print text, lines, and patterns in the color sequence, and then put the full version on the machine for printing at the end. This can avoid the imprint being left unseen due to the thickness of the self-adhesive paper. When the paper is dry, the paper collides with each other and is scratched, and the back side becomes sticky.

2. Print the darker colors in the front and the lighter colors in the back. Since the darker ink has strong hiding power and strong adhesion, it is better to print in the front first to facilitate accurate overprinting. , the covering power of light colors is weak, and it is difficult to see if it is slightly out of order when overprinted at the back. Correspondingly, the overprinting effect is also good.

3. Often in a printed product, there are half-tone four-color dots and continuous tone patterns, text, and lines. At this time, the four-color dots should be printed first, which is beneficial to Accurate overprinting can reduce the impact of paper expansion and contraction, and then print continuous-tone text, lines, and patterns. The printing color sequence should be prioritized, and it is more appropriate to start with difficult tasks and then easy ones.

4. The weather changes greatly in summer and in rainy seasons. It is necessary to control the temperature and humidity of the environment, which will affect the uneven moisture content of the self-drying offset printing paper, causing wrinkles; bending, lifting up and down, unevenness, and unevenness before and after printing. The cut paper stacks and semi-finished products must be tightly wrapped in plastic. l. The back of the self-adhesive adhesive is easy to get dirty when printing on the whole plate. This is because the coated paper on the surface of the self-adhesive paper has poor ink absorption. When printing, try to use the original barrel of ink and do not add 6# ink-adjusting oil. Add some appropriate amount to remove the adhesion. Agent, anti-sticking agent; do not add drying oil when the weather is hot. Printing on the full surface is often easy to get dirty on the back, so powder spraying is often used to solve the problem. Although the printing anti-sticking powder spray contains pure plant-based materials, it is dispersible and fluid. The performance is good, but the use of powder spray will directly affect the surface gloss of the printed product, making the ink not bright, polluting the environment, and also affecting the accuracy of the offset printing machine.

2. Pay attention to the balance of offset ink and ink, and control the moisture content of the printing layout. Use the minimum amount of moisture on the printing plate without dirtying the printing plate. The self-adhesive should be smooth and smooth. When printing on the full plate, dark colors should be printed first, and the amount of ink should be sufficient. The back side should not be stained, and then print again. If the background color is thinly overprinted, the printed product will have a better finish.

3. To overcome the shortcomings of large amounts of water and large ink in offset printing, the ink cannot be adjusted too thinly. If it is too thin, it will easily stain the back. If it is too thin, some new ink can be added to enhance the viscosity of the ink.