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Print work throughout the offset printing production plays a vital role, it has a direct impact on printing quality.Technical personnel in the process of sunburn should be from the preparing work before plate burning, exposure, enhancement effect, repair the PS version, such as protecting good plate burning, can complete print.
1, the preparing work before printing
In front of the plate burning, PS version must be thorough, carefully check, make sure the PS version of the surface is smooth, level off, there is no dirt, scratches, etc.In addition, the PS version of the storage environment temperature and humidity should be appropriate, avoid direct exposure to the air, and the storage time not too long.In addition, it is necessary to maintain a clean and tidy printing-down machine, pervious to light glass clean (usually use alcohol to clean), printing film, no dirty.
2, adjust the exposure
First of all, took a piece from the PS version of side length is 100 mm small pieces as test material, and then blank LiuSuanZhi spread on it, after the exposure test, will take off, LiuSuanZhi observation PS any traces on the surface, and then adjust the exposure time exposure again, until it is concluded that the standard of exposure time.
3, ensure the enhancement effect
Solution concentration, developing temperature and developing time are the main factors influencing the imaging effect.The higher solution concentration, developing the higher the temperature, the longer the developing time, the surface of the PS version of photosensitive resin and the reaction of developer more fully, the degree of exposure of dissolved the more thoroughly, but also can create outlets contraction, even lost small branches.
4, repair the PS version
After finish development work, carefully check the PS version of the graphic and the blank part, the existing dirty areas to repair in time.In the process of plate burning, film edge will leave a mark in the surface of PS version, so also want to repair these tracks.PS version after the repair, need to rinse with water will retouching cream rapidly, when flush with the method of from inside to outside, to exempt the version of the paste was rushed to the graphic part.
5, good protection drying plate
In order to protect the sun good plate, coated with a layer of the plate surface hydrophilic protective glue, to prevent the oxidation of the blank part is.As far as possible when glue make gum liquid coating, bao hou uniform scratch plate layout and avoid hard objects.The sun good plate at the same time, pay attention to in to avoid light place clean.
6, check the quality of plate
First of all, with the actual situation of the magnifying glass check branch.Last as if branch, full, 2% of small branches, 3% of the points clear, intermediate node increases obviously, dark color does not appear paste version phenomenon, concluded plate standard quality.Then, check the graphic location on the surface of the plate, diao mouth and pulling the pin position is accurate, the plate layout whether there is a crease, graphic is complete.The existence of abnormal areas to handle in time.
(Gold Printing Group) |
