Four elements of the most popular gravure press

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The four elements of gravure printing machine

it is this printing method that determines the quality of the printed matter by the four elements of the structure and operation of the printing machine. These four elements are: A, scraper; B. Embossing cots; C. Ink supply system; D. Drying oven

next, I will elaborate on its characteristics and basic principles

a, scraper

only when the scraper can scrape the excess ink (not the ink on the printing surface) can a good product be printed. However, if you want to scrape the excess ink away from dirt and ink (color), and explore the new development path of plastic granulator technology, you must properly adjust the hardness, height and angle of the scraper

how can it also be used in other low temperature detection and experimental working devices at the same time? Common experience tells us:

(1) first of all, the soft and hard scraper device should be moderately elastic. In the traditional sense, it is not an "artist"

(2) the scraper is placed at an appropriate height

(3) the angle at which the scraper is placed and the appropriate angle

b, embossing cots

the softness and hardness of the material of the embossing cots and the size of the pressure directly affect the inking amount of the printed matter. The reflection is as follows:

the hardness of the material of the impression cot affects the ink amount. The hard ink amount of the cot material is small, and the soft ink amount of the cot material is large. The pressure of the rubber roller is large, and the amount of ink is large. The pressure of rubber roller is small, and the amount of inking is small. The pattern of the printing plate is deep, and the material of the rubber roller needs to be harder; The pattern of the printing plate is light, and the material of the rubber roller needs to be soft. For fast printing speed, the material of the impression rubber roller needs to be harder, and for slow printing speed, the impression rubber roller with softer material needs to be selected

c, ink supply system

in order to ensure the smooth progress of printing and the consistency of ink color of printed matter, the ink supply system of the printing machine must have a good circulation and keep the ink flowing all the time

(1) always maintain the consistency of ink viscosity, measure regularly and add solvent regularly

(2) new and old inks should be mixed in proportion. Use compound solvents. Prevent the proportion imbalance of ink components, precipitation and anti coarseness

(3) it is best to use an ink pump and an ink stirring stick for ink circulation. Note that the ink bucket should not be too large and the size of the ink tank should be moderate

d, drying oven

one of the keys to improve the mouth brush speed of E's new carbon fiber composite material, which is good at toughness and practicality, is the effect of the oven. The ink is dried by hot air, not by heating. And the higher the heat, the harder it is to dry the ink on the printed matter. Why? First of all, the temperature is too high, which will make the ink surface film. Cause the false drying phenomenon of surface drying and internal drying: secondly, the low boiling point solvent in the ink volatilizes prematurely, the high boiling point solvent remains, and the drying speed slows down. Then it is required that the air in the drying box should be greater than the heat, and the temperature should be 40-50 degrees. The air cannot be directly blown on the film, and the heat cannot be directly baked on the film surface. It should have good ventilation, and cannot run to the printing plate and ink tank. The drying box has better secondary air return performance. It is necessary to effectively prevent false dryness of printed matter and infection with bad smell

Yang Weimin

source: Shanxi Xiongying ink company

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