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2. Drag the cross line: located in the middle point outside the tangent line, distinguish the bite and the tip, which is favorable for printing.
3. Bite mouth midline: Located in the middle of the mouth outside the tangent bite, distinguish between bite and tip, favorable loading.
4. Outer corner line: 3mm outside the tangent of the four corners of the printing plate, which is the basis for the corner size when the first color is calibrated, and is also the standard for setting the cutting position.
5. Inner corner: finished product specifications cutting line.
6. Color mark: located outside the tangent line on the side of the needle, consists of four blocks of yellow, red, blue and black. It is used to check the color leakage and needle position mark, which is conducive to align paper and beer cutting process.
7. Control strips: Control the quality of printed products. Placed outside the tangent line.
Fourth, the print job requirements for the printing plate 1. Cross line alignment, does not allow errors. Test with a magnifying glass. 
2. The size of both sides of the mouth is the same; the size of the mouth meets the printing machine requirements.
3. The blank part of the printing plate is free from dirt and has good hydrophilicity.
4. The graphic and textual parts have good ink absorption performance; the dots are strong and smooth; the text is clear, unambiguous, and free from the demarcation; the field is flat and firm and does not reveal the bottom line; the flat screen is even and smooth, with no unevenness.
5. Reproduces the tone of the shades of positive shades.
6. The detection line is complete. 
7.15 times the magnifying glass detection, 3% of the visible network, 5% of the network just spelled angle. 
Fifth, the factors affecting the print quality 1. PS version should be from the six major aspects, the quality of the PS version of the identification: sand water storage, the quality of the oxide layer, photosensitive layer quality, photographic performance, ink and hydrophilic properties.
From the perspective of the printing process, the PS version must have the following advantages:
The photoreceptor layer has high resolution, rich layers, smooth and solid dots, good ink absorption, good ink transfer performance, good repeatability, wear resistance of the oxide film, and good hydrophilic and oil-repellent properties.
Half-tone printing plates, printing rate should reach at least 50000 India.
2. Shaiban light source lighting source, to consider two factors:
The emitted spectrum is consistent with the PS version of the absorption spectrum. The emitted spectrum can pass through the glass.
In recent years, the most popular among the printing industry is the iodine lamp, which has a radiation spectrum between 350 and 450 μm. Matches the best spectral sensitivity required for the PS plate.
Generally about 3000W is appropriate, the wattage increases, and the exposure time is relatively shortened.
Note that the lamp distance adjustment complies with the specification.
3 exposure time length.
Generally controlled between 60 ~ 120S. (According to the use of media performance test shall prevail). Small outlets, low density, relatively short time. Fields, coarse nets, and yellow flakes are relatively long.
Control the exposure of the two expression methods: 1. The length of exposure. 2. How much light flux is input?
Luminous flux F reflects the amount of light energy passing through a certain area per unit time, and the unit is “lumensâ€.
Illuminance E, the physical quantity that reflects the degree of illumination of the surface of the object:
Illumination unit: lumens/meter 2, also known as lux.
Various PS versions have a continuously adjusted version of the scale that controls exposure.
Taking Huaguang as an example, the control scale of printing on the printing plate is: the first grade to the third grade of whitening; the fourth grade appears the photochemical reaction, and the density is blurred.
National professional standards, print with corresponding ladder feet:
Staircase density values ​​between 0.65 and 0.8 should be retained, with ink receptivity. Density value in the 0.35 area, removed, whitening without ink.
At this time, all the exposures of the printing plate are the standard and the optimal exposure.
4. Developer concentration, development time The developer is a weak alkaline solution. It should be controlled between PH10±2 (reference value).
The development time should be controlled between 60S and 100S. The speed is too fast, it is difficult to control, and the small points are volatile, affecting the layout of the text and oil. If the speed is too slow, it may lead to incomplete development, and the blank part may become contaminated. The temperature of the developer should be controlled within the range of 20 °C ± 2 °C. Pay attention to fatigue failure and timely rehydration. (To be continued)
Third, the printing plate must be prepared on the test line, color standard, control bar 1. School Edition + word line: color overlay standard, the error should be in the range of 0.05 to 0.1 mm.