The Process Of Plate Printing Failure Analysis
Currently, there are water Offset printing Print use Plate Essentially Positive PS version
. PS version of the version of the base is aluminum, PS edition plate is the key to maximize the network's tone-level representation, as after the proofing process for the operator to provide qualified print version. And Offset The operator will have to use the good plates, so as to print out good quality prints. However, in reality, often between the proofing process and printing processes for the quality of plates created conflicts. Who is to blame, exactly, sometimes it is not clear, but there are rules to follow. General breakdown of proofing process can be summarized as: true, deep, shallow, poor, low-six words. Specific graphic say is true, deep, shallow, empty part of the dirty, poor graphics and written, printed with a low plate resistance. Most of these failures were found in the printing process. Offset press operator, as is necessary to understand the causes of failure of some burn out.
Burn out the main process is the extraction operation, exposure, development. Exposure to time it, but will have to master visualization Developer solution Concentration and time.
1, Photo-fat virtual (1) Plate Vacuum pump Poor performance exhaust, vacuum insufficient contact with the plate proofing original and false.
(2) burn out original graphic density is not enough, send virtual graphic graphic exposure caused.
2, graphics too (1) lack of exposure (2) developer solution concentration and the temperature is too low, too short development time, developer solution recession fatigue.
3, Photo too shallow (1) Exposure excessive or uneven PS Exposure time is too long, due to the diffraction of light, causing light-sensitive layer should not see the light also met with the light, resulting in photolysis, dot narrow, text lines, thinner, or even break program.
(2) the excessive concentration of developing solution, the temperature is too high or too long developing time.
4, the blank part of the dirty
(1) burn out the glass with dirty spots
(2) original printing down there dirt or fog high
(3) printing down to lack of time
(4) imaging is too inadequate or develop basic
(5) In addition to improper dirty
5, plates of poor graphic and written
(1) overexposure (2) In most cases, development time is too long, developing concentration or developer solution temperature is too high will lead to graphic part of the photosensitive layer is dissolved a small amount, resulting in loss of 2% of the network. Therefore, the development time must be right, when new with the developing solution, in the developing temperature is high, development time is shorter, whereas development time to be appropriately extended.
6, baked version of anti-Indian forces led to low
Now many printing companies, in order to pursue anti-India forces, and has good plate drying, toasting, baking temperature and time is the key. After baking the PS version, the normal color is reddish brown. If the layout was tea, green or dark green, indicating that the temperature is too low, or bake baked version version time is too short, light-sensitive layer of resin is not fully cured at this time should be increased to extend the baking time, baking, or until the layout until the color to red-brown . If the layout was dark brown, indicating that high temperature bake or roast version version too long, so light-sensitive layer of the resin part of the carbonation, the deeper the color, carbonization of the resin more resistant plates are printed edge lower.
by: fdgbg
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