1. Processing of engraved intaglio and corroded intaglio The engraving gravure is processed by an electric engraving machine, using needles of different angles to form a V-shaped groove of different depths after being hit on the copper-plated gravure cylinder, and then the surface of the gravure cylinder is plated with a wear-resistant chrome layer, which is polished , You can make a printed version on the machine. During the printing process, these V-shaped grooves are used to transfer the ink to the printing material. Etching gravure uses imaging technology to create an image on the surface of a copper-plated intaglio cylinder. After etching, a U-shaped groove is formed on the cylinder surface, and then chrome plating and surface polishing are performed. 2. Comparison of engraved gravure and corroded gravure The use performance of engraved gravure and corroded gravure is not much different, but the service life of the two is quite different. After the V-groove on the surface of the engraved gravure is worn, the depth of the groove becomes shallow. As the width of the bottom of the V-groove becomes narrower, the area of ​​the dots becomes smaller, the amount of ink in the groove gradually decreases, and the ink color quickly becomes lighter, resulting in the scrapping of the printing plate . If the depth control of the engraved gravure is not good during the engraving process, it will also affect the printing quality. Too deep is easy to cause ghosting during the printing process; too shallow will affect the service life of the printing plate. The surface of the etched layout is a U-shaped groove. As the printing plate wears, the depth of the groove becomes shallow, but the area of ​​the dots does not change, and the amount of inking decreases slowly, and the printing color does not change much, so Its service life is relatively long. At present, domestic gravure manufacturers all use electro-engraving to make plates, and corrosion gravure is mainly produced by foreign manufacturers, and the price is relatively high.
The height of the elevating study table can be adjusted by itself. For example, when a child is doing homework, he can adjust it to the most comfortable and suitable height according to the height of the child, so that when the child is doing homework, he can avoid hunched over the chest or tilted his head too much. The sitting posture of the child and the use of a desk with a suitable height will have many benefits for the child's sitting posture and physical development after a long time.
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