Factors that ensure smooth printing and consistent ink color
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Gravure 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 plague the soft pack factory, but in fact the gravure quality control is rule-based. The basic principle of the four elements of the gravure printing machine is this printing method. The structure and operation of the printing machine determine the quality of the printed matter. The four elements are: squeegee, embossing roller, ink supply system, drying Dry box, below I will explain its characteristics and basic principles: the scraper can only print the good product if it scrapes the excess oil on the non-printed surface. If you want to scrape the excess ink, do not appear dirty, running ink (running color), knife line, you must adjust the hardness, height and angle of the blade placement.
The usual experience tells us: First of all, the softness and hardness of the scraper device should be moderately flexible. Place the scraper at the appropriate height. The scraper is placed at an angle that fits the angle. The softness and pressure of the material of the embossing roller embossing roller directly affect the amount of ink on the printed matter. The hardness of the material of the embossing roller affects the amount of ink, the material of the rubber roller is hard and the amount of ink is small, and the material of the rubber roller is soft. 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 printing plate pattern is deep, and the material of the embossing roller needs to be hard; the printing plate pattern is shallow, and the material of the embossing roller needs to be soft. The printing speed is fast, the material of the embossing roller is harder, and the printing speed is slow, and the embossing roller with soft material is needed.
If you want to ensure the smooth printing and the consistency of the ink color of the printing, the ink supply system of the printing machine must have a good cycle, and keep the ink flowing constantly. Always maintain consistency of ink viscosity, timing measurement, and timing solvent addition. New and old inks should be blended in proportion. Use a complex solvent. Prevent the imbalance of the ink composition, and precipitate and reverse the phenomenon. It is best to use an ink pump and a stir bar to circulate the ink. Note that the ink hopper should not be too large and the ink tank should be moderately sized. Drying box drying box is one of the keys to improve the printing speed. It is the effect of the oven. The ink is dried by hot air, not by heating. The higher the heat, the less easily the ink on the print is dry. First, the temperature is too high, causing the ink surface to conjunct. The result is that the low-boiling solvent in the ink is prematurely volatilized, the high-boiling solvent remains, and the drying speed is slowed down. Drying box is required, the temperature is 40-50 degrees, the wind can't be directly blown on the film, the heat can't be directly baked on the film surface, it has good air exhausting, can't run to the printing plate and ink tank, bake The dry box has better secondary return performance. It is necessary to effectively prevent the print from drying out. Limitation of printing speed Why does the printing speed of the printing press go from high to low? First, it is determined by the length of the transfer distance between the colors of the printing machine. The longer the transmission distance between the colors, the higher the printing speed. It is difficult to increase the printing speed. Secondly, the effect of the drying box is to determine the printing speed. Because the front color is not dry, the back color will bite the front color, causing coloring. Therefore, a good drying box should have the above characteristics, the wind is greater than the heat, the wind can not be directly blown on the printed matter, the wind can not be run, the exhaust air is smooth, and the secondary return air performance is better.