How are the different patterns of the tin box printed

The first step in making a tin box is how to print the pattern on the tinplate. Iron box printing uses the physical properties of water and ink to repel each other. It uses the pressure exerted by the roller to transfer the graphics and text on the printing plate to the tinplate through the blanket. This is the commonly known principle of offset printing. The tinplate has special physical and chemical properties and printing adsorption capacity, and the printing process and offset printing are different. After finishing all the colors, the tinplate needs to be coated with a layer of bright oil on the surface, the purpose is to improve the surface gloss, but also to increase the hardness of the iron material, so that the printing ink layer has a certain degree of flexibility and corrosion resistance, so Can produce a dazzling eye-catching pattern.

1. Four-color printing: refers to the printing process that uses the three primary colors of yellow, magenta, and cyan ink and black ink to reproduce various colors of color originals. And because of the similarity between blue and blue, four colors have produced a popular saying in many places: black, red, blue, and yellow. Four-color printing is also known as CMYK printing method

2. The color visual effects of the spot color printing color block and the four-color overprinting color block are different. The ink prepared by spot color printing is based on the principle of subtractive color mixing of pigments to obtain colors. The color brightness is low and the saturation is high: the spot color block with uniform ink color is usually printed on the spot, and the ink volume should be appropriately increased. When the thickness of the ink layer on the layout is large, the sensitivity of the change of the ink layer thickness to color changes will be reduced, so it is easier to obtain a uniform and thick printing effect.

3. The color block printed by the four-color printing process. Since the various colors that make up the color block are mostly composed of a certain proportion of dots, the thickness of the ink layer must be strictly controlled when printing the dots, which is easy to change due to the thickness of the ink layer. And changes in printing process conditions cause color intensity to change. Changes in the degree of expansion of outlets. This causes the color to change. Moreover, since the change of any color of the color block will cause the color of the color block to change, the chance of uneven ink color will be doubled. Therefore, the color block printed by the four-color printing process is not easy to obtain the ink color. Uniform effect.

4. If you can't use a multi-color machine to overprint the color of the color block at one time. It is also prone to color shift due to the difficult control of the color of the semi-finished product. In addition, the four-color printing obtains the comprehensive effect of the subtractive color absorption of the dots and the additive color mixing, and the color block has higher brightness and lower saturation. For light-colored blocks, the four-color printing process is adopted. Due to the low coverage of the ink on the paper, the ink color is flat and lacks a thick feeling. Due to the angle of the dots, the presence of patterns will inevitably be felt.