Sun Photo Quality Control for PS Plate (3)

(B) The resolution of the PS version resolution

The most important factor affecting the virtual reality of printing plates is the resolution of printing plates. The higher the resolution of printing plates, the better the performance of small outlets and the more real the outlets. At the same time, if you want to determine the exact exposure time, you must first confirm the PS version of the resolution.

Observe the reproduction of the yin and yang lines of the yin and yang loop area of ​​the UGRA control strip using a 10x magnifier (at least 50% can be clearly reproduced).

According to the regulations of the UGRA1982 measurement and control strip, at a certain exposure time, the same level of the Yin and Yang lines in the yin and yang circle area can be clearly observed at the same time. This level is the resolution of the printing plate, as shown in the above table Edition resolution is 6μm.

(three) the appropriate exposure time judgment

We only have a high-resolution PS version, good exposure conditions are not enough, but also there is sufficient and not excessive exposure time in order to produce a good PS version.

The following table is a list of parameters recommended by UGRA manufacturers to find the right exposure time: (The yellow area in the table is what we can use in real production)

According to the results of the previous stepwise exposure, the resolution of this printing plate is 6 μm. It is a PS plate with a resolution between 5μm and 8μm. The exposure time that should be used is the range of exposure time required for the minimum reproducible popliteal width listed in Table 2 between 12 μm and 15 μm.

Observe the reappearance of the positive line of the yin and yang loop area at all levels of exposure, and the exposure with 10 μm remnant, 12 μm full, and 15 μm clear is the appropriate exposure time. Exposure time can be slightly longer for linework

(to be continued)