Identification of the number of outlets in the printing process

The outlets are the basic units for realizing that printed products can reflect the level of the publication surface and the level of lightness (darkness). It plays a role in determining the print color, gradation, and image outline in printing. Therefore, when the plate is made, only the dot size is accurate to faithfully reproduce the original color, ensuring that the printing process achieves good results. Because the degree of shade of the printed page is expressed by the size of the dot, the dots of different sizes are commonly referred to as “becomes” in the process. Only with an accurate understanding of the concept of the dot number, can we better use dots to print the prints closest to the original color.

Therefore, understanding the number of outlets is the knowledge that print operators and quality inspectors should master. Several types of outlets are summarized as follows: The identification of the number of points within 50% of the internal network points is based on the number of pairs of black and white dots that can accommodate the gap between the two sides. That is, within the gap between the two black dots on the opposite side, three equal-sized black dots can be placed, which is a dot of 10%. If the distance between two dots can accommodate two equally large dots, It is called a 20% dot; if there are 1.5 dots of the same size between two dots, it is called a 30% dot; if it can hold 1.25 dots of the same size between two dots, it is called 4 dots. As a net point, if there is one dot of the same size between the two outlets, that is, the black dot and the white dot in the unit area are each half, that is, 50%. And 50% of the Internet sites are judged by the number of white spots that can hold the same size between the two white spots. Judging from the law of dot arrangement, the number of dots contained within the spacing of two white dots is exactly the same as that of 40%; 70% is the same as 30%; 80% is the same as 20%; 90% is the same as 10%.

The above situation shows that the so-called dot number is the percentage of the unit area. For example, a 10% network is 10%, 2 is 20%, and other analogies are 100% for the site layout. From a rough analysis of the positions of positive positions, if the black point is greater than the white point, 50% is the Internet point; if the black point is smaller than the white point, it is 50% or less. The larger the dot number, the thicker the printing ink will be, and vice versa. The size of the outlet area determines the layout level change. Usually the level on the screen is divided into three levels of tone, that is, the high-level level is composed of 1 to 3 percent net points, so that bright parts are formed on the screen. The intermediate tone levels represent the light and dark transitions of the picture, usually consisting of 4 to 6 percent of dots. The dark and dark pictures composed of 7 to 9 percent dots are low-key levels. The brightest place on the printing plate surface, that is, the high-light part is 10% or less.

In summary, only by accurately understanding the number of outlets can we make better use of the changes in outlets to produce printing plates that meet the manuscript and print color products with accurate colors and satisfactory quality. This is precisely the goal of quality management.

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