The unevenness of ink color on the spot printing is a relatively common problem in printing. Generally, the printed product is characterized by unevenness of water grain and unevenness of orange peel. Many people are troubled by this and always want to find out the cause and solution. Then this article will introduce the causes of printing ink color unevenness and the corresponding solutions.
1. Reason
The unevenness of water streaks is mainly caused by the intaglio carving too deep, and the viscosity of the ink is low.
The main reason for the uneven color of orange peel ink is that an excessive amount of polar solvent such as methyl ethyl ketone is added to the ink. The second is that the viscosity of the ink is too high, which results in poor leveling. The third is the quality of the impression rubber roller (the particle density of the adhesive layer is inconsistent), which causes uneven pressure on the different parts of the plate cylinder during printing.
2. The solution
(1) Contact the plate-making enterprise, first make a test plate to test the ink and solvent used according to conventional process conditions. Ink is mainly used to test commonly used spot color inks, such as Asakusa, Green Grass, Ultramarine, Brown, Sauce, Medium Blue, Earth Yellow, Vermilion, etc. Find out the matching results of plate cylinder, ink and printing conditions through testing. Plate-making enterprises use this as a basis to determine appropriate engraving process parameters. After this process, the gravure has a strong adaptability to solve the uneven spot printing on the spot.
(2) When receiving new jobs, communicate with customers in a timely manner and try to avoid carving the spot color version too deeply. If the gravure is carved deeper, the working viscosity of the ink can be appropriately increased on the basis of ensuring the ink leveling.
(3) For spot color orange peel unevenness, the first one appropriately reduces the viscosity of the ink, the second lesson appropriately reduces the pressure of the embossing rubber roller, and the third one increases the printing speed as much as possible.
(4) Reasonably mix solvent ratio and working viscosity of ink. When the printing speed exceeds 100m / min, the viscosity of the ink is generally controlled at about 20 ~ 26s, and the fast-drying solvent can be appropriately increased in the solvent ratio.
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