subject: Ps Version Of Affecting The Transfer Of The Three Factors Outlets - Network, Printing Down - [print this page] Contact plate and printing plate burning is an important bridge, is an important factor affecting the printing quality. The so-called burn out, is that the camera through the photochemical original (film) on the network faithfully transferred to the plate (Yin graphics anhydrous PS version ) On the process. As technology, materials, equipment and other factors, often difficult to achieve a faithful reproduction purposes. Therefore, in order to ensure the printing quality, we must control the quality of printing down, that is, the transfer of control networks. Below, we will transfer the right to control the network for analysis.
Through the entire process of proofing, can know the main factors are the following: original (film) quality, Plate Reproducibility, Plate And light.
1, original (film) Quality Ideal network should be the original quality of high density (D> 3), ideas are real, and is a smooth rigid network. When such a network in the proofing tolerance exposure and contrast in a large, easy to do faithfully copied. Network center density and edge density to be consistent, so as to expand the exposure time of tolerance to complete the transfer network. Original should be clean, not dirty track, or to burn out with dirty.
2, plate of dot reproduction Dot reproducibility plate is sensitized in the proofing process can reproduce the original as possible dot reproduction of materials mainly reflected in the version of the resolution and film thickness of the area. As the PS version is pre-coated sensitized, the substrate for the aluminum version, the top of the substrate coating a uniform layer of photosensitive film. Therefore, the aluminum version of the bottom base of the treatment process directly determines the quality of the good or bad plate. This part of the plate often is the user who the invisible. So, by purchasing channels to ensure the quality of the plate is particularly important. If the plate rough, poor quality can lead to resolution down, seriously affecting the printing quality. Some low-grade aluminum plate to cover up the end based on the version of sand present, will increase the thickness of photosensitive film. This would result in increased exposure of diffraction, resulting in decreased resolution and affect print quality.
The following is the quality of the plate impact and replication on network requirements:
(L) local flower version, paste version
Version of the base to clean, consistent thickness and sand present distribution, thickness is moderate, moderate depth. Photosensitive liquid coating evenly, no bubbles, no injuries. Generally require an average depth of sand present (Rz) in 5 ~ 7.5 m, the average roughness limit (Ra) around the 0.6 m. All this affects the quality PS version, resulting in rapid wear of local, a "flower Edition", paste version, and then from there down version and dirty.
(2) PS version of the surface roughness of non-standard
Head and thick sand, so protection of water shortage, easy to play dirty: the sand head too small, so porous in the photosensitive film was difficult to clean, version of the base easy to pollution, easy to play dirty when printing.
(3) partial out the word out version
Electrograined version of the base after the gray matter is not removed the net, local photosensitive layer adsorption is not strong; in the light-sensitive coating liquid before the layout is not net washing, hang to dry when leaving traces of acid flow, will cause local out version.
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