Core factors of the hottest printing outlets

Core factor of printing point

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core tip: in the printing process, continuous and halftone images are adjusted by the density of points. By mixing the dots of CMYK four colors, you can show an infinite number of colors

[China Packaging News] in the printing process, continuous and halftone images are adjusted by the density of points. By mixing the dots of CMYK four colors, you can show an infinite number of colors

I. amplitude modulation point

amplitude modulation point is the most widely used point at present. Its point density is fixed, and the depth of color is expressed by adjusting the size of points, so as to realize the transition of hue. In printing, the use of amplitude modulation points mainly needs to consider point size, point shape, point angle, line accuracy and other factors

2. Dot size

dot size is determined by dot coverage, also known as inking rate. Generally, it is customary to use "Cheng" as the unit of measurement. For example, the point with a coverage of 10% is called "one Cheng", and the point with a coverage of 20% is called "Two Cheng". In addition, the point with a coverage of 0% is called "Jue", and the relevant national departments of the country with a coverage of 10 once again organized the revision of the national standard of polyurethane waterproof coating, and the point with a coverage of 0% is called "field"

the tone of printed matter is generally divided into three levels: bright tone, middle tone and dark tone. The point coverage of the bright part is about 10% - 30%; The point coverage of the intermediate adjustment part is about 40% - 60%; The dark part is 70% - 90%. The field part is divided separately

III. point shape

the point shape in printing is not just a single circle in your imagination. It can be divided into three types: square, round and diamond according to the shape of the point at 50% inking rate

square points form a checkerboard under 50% coverage. Its particles are relatively sharp and have a strong ability to express levels. It is suitable for the performance of lines, graphics and some hard tone images

circular dots are independent in both bright and middle tones, and only in dark tones can they be partially connected. Therefore, the performance of the mining level is poor, and four-color printing is rarely used

diamond dots integrate the hard and soft characteristics of square dots and circular dots. The color transition is natural and suitable for the performance of general images and photos

IV. point angle

plays a variety of roles in printing plate making, such as dragging, straightening, stabilizing tension and so on; For roller type (divided into horizontal type and vertical type), the selection of point angle plays a vital role. If you choose the wrong point angle, interference fringes will appear

the common point angles are 90 degrees, 15 degrees and 45 degrees. First observe the detection and debugging of the tensile testing machine, and 75 degrees. The 45 degree point is the best, stable and not dull; The angle stability of 15 degrees and 75 degrees is worse, but the visual effect is not rigid; The 90 degree angle is the most stable, but the visual effect is too rigid. Xin'an feels that there has been an additional "glass room" in the farmers' market recently, which has no aesthetic feeling

when two or more points are set together, there will be mutual interference. When the interference is serious enough to affect the beauty of the image, the commonly known "moire" will appear

generally speaking, when the angle difference between the two points is 30 degrees and 60 degrees, the overall interference fringes are relatively beautiful; The second is the point angle difference of 45 degrees; When the angle difference between the two points is 15 degrees and 75 degrees, the interference fringes will damage the beauty of the image