CTP printing plate

Writer： admin Time：2022-04-15 18:49 Browse：℃

The apparent quality of aluminum plate base In the production of CTP plate, the apparent quality of aluminum plate base has the greatest impact on production and the quality of the final product, and it is also the most difficult to control. produce different defects. Therefore, to ensure the quality of the CTP printing plate, the apparent quality of the aluminum base is the premise. The apparent quality of the aluminum plate base is divided into two parts: one is the appearance quality of the reel packaging; the other is the apparent quality of the aluminum plate base. The former is also often ignored.



1 Coil Appearance Quality Generally, when the aluminum sheet base is received, the appearance should not have these defects: outer ring damage, creases, scratches, dents, pallet damage, strapping marks, etc. Usually, the appearance inspection of the aluminum plate base after unrolling and before the machine is often ignored. In fact, the inspection of this first link should not be underestimated, otherwise it will cause the aluminum plate base to break, burn the plate, and even damage the coating nozzle and other equipment, resulting in production interruption. cause unnecessary economic losses. There are two ways of transporting and packaging the aluminum plate base: vertical and horizontal. No matter which method is used, the quality of the end faces on both sides must be checked first after unpacking. Whether there are bumps or dents on the end faces on both sides, once these problems are found, they should be dealt with in advance before putting on the machine, because these damages will increase the nominal thickness of the aluminum plate base at the damaged position, which may not pass through the gap of the coating nozzle and eventually be coated The cloth nozzle is scratched and the strip is torn until the strip is broken; also, whether the shaft core is loose, whether the surface layer is oxidized, etc.
 
2 The influence of the typical surface quality of the aluminum plate base on the CTP printing plate The imported aluminum plate base has stable apparent quality, and the defect rate is lower than 0.5%; while the domestic CTP plate uses the aluminum plate base with many surface defects and poor quality stability. , technology and management level to further improve. Faced with this situation, CTP plate manufacturers should put forward specific requirements for the quality of aluminum plate bases according to their own equipment capabilities, electrolytic corrosion capabilities and other process conditions; Quality requirements. In general, the aluminum plate base should have good apparent quality, uniform quality, no stains, bumps, scratches, creases, edge oxidation, non-metallic indentation and sticking, etc. No rolling or rolling lines visible to the eye are not allowed. and other defects that affect printing. On the premise of ensuring product quality, the surface oil content should be minimized.