1, the influence of the smoothness of the layout
At present, the printing plate of Ji'nan calendar is mostly made of electronic engraving and plate making. In the process of electric carving, the edge of the net point will produce burr. If the burr is not cleaned in the polishing process, the printing ink is not easy to scrape in the printing process, and the scalpel will be damaged in serious time, thus forming a knife. Line. For the printing line caused by the surface roughness of the plate, 1200 fine sand paper can be used to gently grind the plate, but in general, it is better to not polish the plate to avoid damage to the plate.
2, the influence of the hardness of chromium layer
Plate making, if the chrome plating time is too long, the hardness of the chromium layer on the printing plate is too high, it is easy to damage the scraper blade, and there will be a variable knife line on the printed matter. On the contrary, if the time of chrome plating is too short, the surface of the printing plate is too soft, and the blade is easy to damage the printing plate, and there will be a fixed knife line on the printed matter.
3, the influence of the cleanliness of the layout
The crumbs generated in the grinding process of the plate making can not be completely removed and attached to the printing plate, which will damage the printing plate and scraping cutter in printing process, thus creating knife lines. Before the new version is printed, it is better to thoroughly clean the oil and impurities with solvent, so as to reduce the failure of printing knife line.
4, the influence of machining precision
The poor machining precision of the plate roller can also cause the line fault of the printed matter, and it is difficult to detect or not be easily checked, so it is easy to be ignored, and the machine can be checked in the actual operation. In addition, the installation accuracy of the plate should be strictly controlled so as to avoid the excessive impact of the concentric error on the scraper blade in high speed printing, which causes the fault of the print tool line.
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