Talking about the Control of Printing Quality of Color Newspapers (Part Two)

Third, registration color newspaper has reached a predetermined accuracy requirements <br> <br> color newspaper factors affect a lot of register accuracy: â‘  film itself is issued can register; it can guarantee registration accuracy â‘¡ make-up; â‘¢ Whether the punching, copying, bending, and loading are accurate; 4 whether the main threading roller of the printing machine is horizontal or not, and whether the surface of the threading roller in the middle of the printing unit is cleaned in time; 5 The pressure of the two blankets on both sides of the blanket Whether it is balanced; 6 the size of the gap in the middle of the blanket has an effect on the accuracy of the upper and lower register; 7 whether the paper itself in the printing process has a rewinding phenomenon; 8 the fan-shaped expansion of the printing process affects the color of newspapers. Register accuracy and so on. Taking into account the above influencing factors, we require the registration accuracy of the assembled film to be less than 0.02mm, and the accuracy of the final printed newspapers is guaranteed to be around 1 line, with no more than 2 lines, for newspapers over 2 lines. Will be treated as a waste report.

4. Whether the ink-and-ink balance in the printing process in the printing process is at its best

Maintaining the best ink-and-water balance during the printing process is very important for printing good news. When the balance of ink and ink is controlled better, the printed newspapers can be printed in colorful, glossy, easy to use the least amount of color. The water and ink print the most beautiful newsletters; on the contrary, if you ignore this problem, the unlimited increase of ink in the printing process will bring about a wide range of emulsification of ink, newspaper damp sticky hands, as well as heading gray, photos Dark and other hazards.

There are two general consequences of the destruction of the ink-and-wash balance: First, the layout is dirty; first, the amount of water is too large. Everyone knows that the newspaper carries dirty harm. Here we mainly talk about the dangers of excessive water.

The surface phenomenon of excessive water volume is that the printed newspapers are grayed out and the images are dull. Actually, the over-large water and ink damage is also reflected in the following aspects:

1 Water will enter the ink fountain along the transfer roller and ink roller, resulting in a wide range of ink emulsification;
2 will wet the printed sheets and affect the quality of the newspapers;
3 will make the printed newspaper heading gray, dark photos;
4 The viscosity of the ink is drastically reduced, resulting in floating of the dirt or turning of the ink stick into the water bucket, and then refluxing into the water tank. The time is longer and the floccular ink particles appear in the water tank.
5 will produce a lot of acidic vapor, corrosion of the machine.

Fifth, the impact of equipment maintenance and maintenance on the printing quality of color newspapers

In order to achieve the best ink-water balance in printing, besides requiring the printing operator to have a strong sense of responsibility when it is standing, it is also inseparable from the usual maintenance and maintenance of printing equipment. In the production practice, the maintenance and the maintenance of the equipment have a great influence on the printing ink balance and even the printing quality of the entire newspaper. Therefore, in the usual production management, the maintenance and maintenance of the machine by the operator can usually be detected by the value of the ink and ink balance in the printing process. The maintenance requirements of the equipment are mainly from the following six aspects.
1. After printing the newspapers on the same day, clean all the machine's glue, ink, and paper rollers.
2. Regularly check the pressure of water glue and ink, especially when changing seasons, check the pressure of all the rubber rollers thoroughly. If it is found to be inconsistent with the specified pressure value, adjust it to the specified value in time.

3. The issues related to printing equipment reflected in the ordinary newspapers should be promptly investigated and resolved in a timely manner.

4. Regularly measure the concentration of dampening water in the tank and require that the conductivity value and pH value of the dampening water meet the standard at the same time (the conductivity value is generally between 1000 and 1400 μs, and the pH value is generally between 4.8 and 5.3).

5. Regularly clean water tanks, water buckets, inlet pipes and return pipes to remove dirty pieces from them to prevent blockage of the buckets due to dirty blocks and affect normal water supply.

6. Check the flatness and resilience of the blanket surface, so that it can be checked regularly and replaced in time (double-width machines must also consider eliminating gaps between the two blankets in time).

In addition, the use of printed materials and the ideal printing equipment have a very significant impact on the printing quality of color newspapers. No further introduction will be made here.