In plastic gravure printing, there are many factors that affect the quality of products. The following is a brief introduction to everyone.
1. Clear printing and printing
Before printing, first determine whether the printing method is surface printing or inside printing, and then determine the type of film and distinguish the corona treatment surface; determine the type of plate cylinder (reverse or genuine); choose different types of thinners for ink.
2. Determine the appropriate temperature and humidity
If the temperature in the printing workshop is too high and the humidity is too high, the printed matter may easily stick back. Fading, color transfer, blocking, poor firmness, etc., in severe cases, will also cause the ink to decompose and not print. If the workshop is too dry, static electricity will be generated when the printing speed is fast, causing the ink to move upstream on the film, and when the printing speed is slow, the printed matter will be dull and dry plates will appear. Pasting and other phenomena. Generally, the temperature in the printing workshop is controlled at 18-25 ° C, and the relative humidity is controlled at 55% to 75%.
3. Plate cylinder positioning should be balanced
The balance of the printing plate cylinder depends on the printing machine and the plate-making plate roller, and is also affected by the installation. When installing, be sure to determine the position of each color plate cylinder, and install firmly. The position of the plate cylinder is determined by the alignment line on the plate cylinder and the length of the plate cylinder. For the plate cylinder without keyway, the screw must be tightened.
4. Impression cylinder pressure should be appropriate
Impression cylinder is not flat, there will be missed printing, uneven coloring and other phenomena; the pressure of the impression cylinder is too large, the printed pattern will appear ghosting, unclear, dull, etc .; the pressure of the impression cylinder is too small, it will appear The net part is not colored. The text is not clear, etc. The high-quality impression cylinder should be selected, and the pressure of the impression cylinder should be adjusted during printing.
5. Scraper angle is adjusted
The angle between the squeegee and the plate cylinder is generally controlled at 45-65 °, and further adjusted according to the depth of the cell and the printing speed. During the adjustment, it should be noted that the distance between the doctor blade and the rubber roller should be matched with the printing speed. At the same time, proper pressure should be given to the scraper. The size of the pressure of the doctor blade can be adjusted according to the graphic depth of the printing plate hole and the sequence of overprinting.
6. Adjust the working viscosity
To adjust the working viscosity of the ink, on the one hand, the printing speed should be taken into consideration. If the printing speed is fast, choose a fast-drying thinner; if the printing speed is slow, you should choose a slow-drying thinner. On the other hand, in the printing process, the volatilized diluent should be replenished in time, preferably mixed with the ink and added to the ink fountain to ensure the consistency of the printed matter.
7. Tension control should be strict
In order to facilitate printing and increase printing speed, the gravure printing machine is loaded. The magnetic powder tension control system is installed at the cutting place to automatically control the tension. Some high-end gravure printing machines have also installed computer tracking and automatic control systems in various color groups. For printing machines without a computer color register system, the tension of each color group is adjusted manually. When adjusting, the printing speed and the tension should be considered comprehensively.
8. The drying system must be matched
The drying system affects the speed of the gravure printing machine. From single oven to double oven and multi-function oven, drying tunnel, no matter what kind of drying system, its main function is the same, one is to increase the speed of the printing press, and the other is to improve the adhesion of the ink on the film surface, so that the diluent in the ink Drying to prevent false thousand, resulting in odor after sticking back or making bags. Therefore, the drying system should be matched with the speed of the printing machine, and then the oven temperature and air volume should be adjusted according to the size of the pattern area on the printed product.
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