Gravure printing is the most commonly used printing method in flexible packaging, and its printing quality is directly related to the expressiveness of the product. In the production practice, many problems plagued the soft pack factory, but in fact the quality control of gravure printing is a rule to follow. The basic principle of the four major elements of the gravure printing machine is precisely this kind of printing method. The structure and operation of the printing press determine the quality of the printed matter. The four major elements are: squeegee, embossing roller, ink supply system, and baking. Dry box, below I will elaborate on its characteristics and basic principles: scraper can only scrape off the excess oil type non-print surface ink) to print a good product. In order to scrape the excess ink cleanly, without hanging dirty, running ink, or knife line, the hardness, height, and angle of the blade must be properly adjusted and placed.

The usual experience tells us: First, the soft and hard blade device must be moderately flexible. The squeegee is placed at the proper height. Scraper placed at an angle, suitable angle. The size of the hard and soft pressure and the pressure of the material of the imprint rubber roller will directly affect the amount of ink on the print. The hardness of the material of the imprint rubber roller affects the amount of ink, the material of the rubber roller has a small amount of hard ink, and the material of the rubber roller has a large amount of soft ink. The pressure of the rubber roller is large and the amount of ink is large. The pressure of the rubber roller is small, and the amount of ink is small. The pattern of the printing plate is deep, and the material of the embossing roller needs to be harder; the printing plate pattern is light, and the material of the embossing roller needs to be softer. The fast printing speed requires the material of the imprinting roller to be harder, and the slower printing speed requires the use of a softer embossing roller.

If you want to ensure the smooth progress of printing and the consistency of the printed ink, the ink supply system of the printing press must be well-circulated, and the ink must be kept flowing constantly. Always maintain consistency of ink viscosity, timing measurements, timing of solvent addition. Old and new inks should be blended in proportion. Use a complex solvent. To prevent the proportion of ink components from being out of balance, the phenomenon of precipitation and anti-roughening occurs. It is best to use an ink pump and an ink stick for ink circulation. Note that the ink fountain should not be too large and the ink tank size should be moderate. Drying box Drying box is one of the keys to improve the printing speed. The effect of the oven is good or bad. The ink is dried by hot air, not by heating and drying. The higher the heat, the less likely the ink on the print will dry. First the temperature is too high and the ink surface will be conjunctiva. The dryness of the surface caused by the dryness of the inner surface of the ink stems from the premature volatilization of the low-boiling solvent in the ink, and the high boiling point of the solvent. The drying speed slows down. Drying box is required, the temperature can be 40-50 degrees, the wind can not be directly blown on the film, heat can not be directly baked on the film surface, to have a good exhaust, can not run to the print plate and ink tank, bake The dry box has better secondary air return performance. It is necessary to effectively prevent printed materials from being dried up.

Limitation of the printing speed The printing speed of the printing press is high and low. The first is determined by the length of the transmission distance between the various colors of the printing press. The longer the transmission distance between the colors, the greater the printing speed. Can go on the contrary, it is difficult to increase the printing speed. Followed by the drying box effect is good or bad to determine the printing speed, because the former color is not dry, after the color will be the former color bite down, causing eating phenomenon. Therefore, a good drying box must have the above characteristics, the wind is greater than heat, the wind can not be directly blown on the printed matter, can not run, the air flow, has a better return air performance.

Source: Hui Yi Network