A: There is no other way to remedy the printing press cylinder faults, so keep the machine in good condition; just like you ca n’t use a car that was manufactured in 1900, for the same reason as the new car race.

2. How does the high-speed printing press control the hue of each roll within a density range of ± 0.08?

Answer: The machine must be installed with automatic monitoring and automatic adjustment functions.

3. In the yellow plum season or when the humidity in the workshop is high and the temperature changes greatly, the ink tends to deink easily. Condensation water will accumulate on the drum, causing large changes in color difference or water stains. Is there any way to improve the water resistance of the ink?

Answer: The ink itself is resistant to water, and the condensate on the roller is because the plant has no temperature adjustment. The best way is to install air conditioning and humidity control systems in the plant.

4. Raw paper paper wool (poor surface quality), which causes missed prints. After adding ink to the ink, it improves, but it often produces bite rise. Is there a better way to solve it?

Answer: The quality of the paper is not good, you should replace the better paper; the use of alternative methods will affect the smoothness and efficiency of actual production. Even if there is a solution, it is not recommended.

5. The aluminum surface of the base paper rubs against the metal roller at a high speed to produce a charge that causes breakdown. It cannot be eradicated after the discharge wheel is installed. Is there a better way to eliminate static electricity?

Answer: In addition to the static elimination device installed on the machine, the static elimination device can be used to adjust the temperature and humidity of the plant, such as adding or subtracting the degree of air conditioning, and installing an automatic humidity regulator in the factory. paper". All in all, if the temperature and humidity are adjusted to be consistent with the paper and the plant, the trouble can be solved.

6. Some dark spot colors black (such as dark blue, brown, purple, etc.) are very easy to rise outside the rubber mouth. At present, they can only be improved by increasing the viscosity, but they will also cause offset printing faults such as paper wool. Is there a best solution? To be resolved?

Answer: The reason for the rise is caused by the unbalanced acid teeth of the sink liquid and the bad ink base. Please adjust the ink and the sink liquid.

7. What factors caused the color change during printing?

Answer: Many factors can not be recorded, please check the paper, ink, sink liquid, plant temperature and humidity, blanket, ink roller, machine performance and status.

8. After the rubber roller has been washed for a long time (use car wash water to change the spot color, two groups of 5 and 6), it is found that the rubber roller is deformed and the middle becomes thicker. Can you recommend a good car wash (Roll Wash)?

Answer: The car wash water is a mixed formula product of the oil company. It should be ordered by a company with all quality assurance. The factory should also test which car wash water is suitable for its application. The use of imported car wash water is too expensive to recommend.

9. How to avoid coloring? For example: there is a design where blue occupies a large layout, and red and yellow account for a small proportion. Often, red and yellow inks are seen to rise because of the blue ink?

Answer: Color drawing is a problem of overprinting multiple colors. The viscosity of the first group of printing colors should be adjusted to the last group of printing colors; the viscosity of the first group is the strongest and the viscosity of the last group is the weakest, then the first group (mostly black) The ink with the strongest adhesion is not easy to be pulled up, the adhesion of the second group of red or blue is moderate, and the adhesion of the third and fourth groups is weak, it will not pull up the previously printed ink; ink manufacturers with quality assurance, It must be stated on the packaging which viscosity value (TACK) of the ink color, the captain can also use the ink regulator to adjust the adhesion ability of each color ink.

10. What is the difference between EB ink and other inks (general offset printing ink and UV ink)? What are the special requirements for EB ink printing blankets?

Answer: Ordinary offset printing inks are oxidative drying inks, which use infiltration and air oxidation to dry the inks; UV inks are light-sensitive inks, which are hardened by ultraviolet light and do not have to wait for drying. The blankets are elastic and inelastic Most of the elastic blankets should be used for printing. Which type of blanket is more suitable for which type of printing must be tested by yourself to find the best fit.

11. Why are spot color inks easy to body print and poor printability?

Answer: Because spot color ink uses a large amount of color development agent (clear ink), the viscosity (TACK) is low, and mixing corn flour or varnish can reduce the problem.

12. How to solve the overprint problem caused by equipment and other problems?

Answer: (1) Use better paper, (2) Use better ink, (3) Use better printing plate, (4) Use better rubber cloth, (5) Use better ink additives, (6) Use quality-guaranteed chemical raw materials (sink liquid, etc.), (7) Adjust the temperature and humidity of the plant to match the state of the paper, (8) Maintain good machine performance, clean and repair frequently, and (9) Strengthen the education of staff Really understand the problem; encourage them to study and put forward suggestions for improvement.

Suggestion: Some printing problems are fundamental. For example, machines, materials, and factory environment, if they are not solved seriously, there is no progress at all. It is difficult for clever women to cook without rice, and no matter how good the staff can't be magic. Another non-fundamental issue is the change in the concept, communication and attitude of managers and work. Managers and staff should continue to receive education and establish an effective communication mechanism. Modern management is called comprehensive management. It encourages the grassroots to find out the cause of the problem, and communicates the problem and the solution upwards layer by layer. And review the effectiveness of the solutions and strengthen discussions to achieve the best results. In the end, of course, we must get the support of the top management. For example, some capital suggestions and the constant temperature adjustment of the plant must be a capital investment. If it is not accepted, all problems will still exist and the problem cannot be truly solved.

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