1. Three requirements for three-dimensional printing 1) Based on offset printing technology, the quantitative weight of coated paper used for printing is not less than 250g / ?; 2) The printing ink color is pure, high temperature resistant, and fast drying; 3) The number of screens is not less than 300 lines / inch or made with Kellogg version. 2. Five elements of three-dimensional printing 1) Data unification: manuscript, pixel data and printed image are always consistent with the lenticular grating pitch, to avoid interference fringes in the finished image due to the difference in data, and affect the visual effect. 2) Accurate overprinting: the error between pixel and raster should not exceed 0.0001 ‰. Because the deviation of any color version will produce obvious ghost images of heterochromatic images when the grating is combined, so that the color and image of the whole image are divorced and cannot be viewed. 3) Rich levels: The printed dots are clear, full, dense but not vague, sparse but not lost. If the dots are out of control, it will cause polarization polarization, which will affect the ideal reproduction of the image stereo and space. 4) No expansion and contraction: Strictly controlling the amount of expansion and contraction of the printed matter is the key to ensure the perfect reproduction of the stereoscopic image. The expansion and contraction of the printed image will break away from the restrictions of the grating pitch, resulting in the change of the visual positioning of the image, and there will be reverse image, false image and visual dizziness. 5) Adjust the screen angle: the difference between the screen angles of the three-color printing plates should be less than that of ordinary offset printing. For example, the screen angle of 300 lines / inch is K37.5 ° C37 °,? 0 °, Y22.3 °, the purpose is to make the dot combination In the cylindrical surface of the lenticular grating, the color lines are arranged horizontally to ensure a balanced transition of the color image layer, avoid collisions caused by the screen angle equal to the vertical grating stripes, and abnormal moire, which affects the smooth reproduction of the color stereoscopic image.
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Three requirements and five elements of three-dimensional printing