How to solve the problem of consumables in the printing process

There are many procedures for printing. To get a good print, each process must be free from problems. Conversely, if there is a mistake in one process, it will not be possible to obtain high-quality prints. If the printing process is subdivided, there are scanning, group making, filming, proofing, printing, and printing. Printing is a very important process. Of course, there are many technical points.

First of all, mastering and controlling the balance between water and ink is the key to stably improving the quality of printing. The ink-and-wash balance is the basis of printing. Only ink and water control is just right, so that printed newspapers and newspapers can be clearly illustrated, dark and light in consistency, and overprinting can be accurate. The key to good ink-and-wash balance is water. On the premise of ensuring that it is not dirty, the water is controlled within a minimum range, and the amount of water and ink are in a relatively stable state. The water is too little, not only dirty, but the plate writing is dull, pale gray, imprinted, and sometimes snow spots: too much water, there will be no fullness of the imprint, the picture becomes light, the writing is empty, no Levels and so on. The absolute balance of ink and wash is no, only relatively balanced. In order to stabilize the ink balance, it is required to do the following in practical work:

1 Note the proportion of fountain solution that is equipped. The proportion of currently used fountain solution is generally 2% to 2.5%, and the water temperature is controlled at about 16°C, the pH value is about 5.5 to 6.5, the conductivity value is about 1600, and the salinity is about 0.50 (Wuchang Donghu The tap water situation in the area is: Conductivity is 270, pH is 7, and salinity is 0).

2 Adjust the ink supply in time according to the quality of the paper. Due to the different paper origins, the smoothness of the paper is also different. Different seasons, the paper's moisture content is also different. Therefore, when printing different papers, the ink balance should be adjusted in time. Generally, newsprint paper with less smoothness and less paper particles has a slightly smaller amount of water, and rough and contaminated newsprints have a slightly larger amount of water; when the machine is running at a high speed, the speed of water is relatively small, and it may be slightly larger at low speeds. . This mainly adjusts the ink supply according to the general performance of equipment, paper, and ink, and different conditions inside and outside the room.

3 Control the environment and temperature and humidity of the workshop, which will help improve the printing quality. Because the layout water is distributed in a direct and indirect manner, the layout water is mostly distributed to the space when the printing ink meets the ink and ink balance requirements during printing. In general, the higher the ambient temperature, the faster the emission.

4 When purchasing auxiliary materials, we try to meet the needs of ink and water balance. Ink, plate, air-cushion blankets, paper, etc. have a lot to do with ink. The amount of paper used is large, and the quality is poor considering its economic aspects. However, the main surface of plates, inks, etc., must also be kept closed. Good materials should be used as much as possible. Under normal circumstances, do not change the brand frequently. Let the shop use a regular pattern. In principle, what should be used to buy what, not what to buy.

5 Strengthening the maintenance and inspection of printing equipment is a means to improve the printing quality. Whether the printing equipment is advanced or not, and whether maintenance and maintenance keep pace with it is crucial to improving the quality of printing. Therefore, in actual work, if we want to improve the quality of printed products, we must strengthen the maintenance and maintenance of printing equipment. Clean the ink roller, ink tank, water tank, water roller, and sink frequently. This cleaning includes daily cleaning after printing, cleaning before each color change, and regular thorough cleaning to keep ink from remaining in the pores on the surface of the blanket. Otherwise, it will oxidize the conjunctiva for a long time, reduce the adsorption capacity of the ink, and reduce the ink transfer. The residual ink in the ink tank and the impurities around the ink keys are often removed so that the ink keys can be released freely. In particular, the current remote ink-control device should ensure the cleanliness of its ink keys. Always clean the water tank, the water tank and the water roller to ensure the circulation of the water circuit. When changing the water, pay attention to the proportion of the dampening water, so that the pH of the water is in the normal state.

6 Check the pressure of the drive section regularly. As the season changes, the machine will continue to operate for a long time, and the pressure of each part will change slightly. These changes have a direct impact on the printing quality. Because of the pressure between the print cylinders, the pressure between the water rollers between the ink rollers is critical to the print quality. In particular, the pressure between the rollers is more severe with the seasons. Under normal circumstances, in March and November of each year, during the two months when climate change is particularly noticeable, a large adjustment of the pressure of the rubber roller must be carried out. Normally, the machine and maintenance personnel must check the pressure of the rubber roller and the roller pressure once every two months and find that the problem is adjusted and resolved at any time.


Source: HC Network