Printing process High-speed multi-color printers often print large-area flat screen and solid color prints because of the large amount of ink used, large area, large viscosity and slow drying, which is prone to print blooming. There are many factors that cause the printing to bloom, mainly due to improper pressure, the acidity of the fountain solution, the viscosity of the ink, the PS plate production, the blanket blanket, the printing process operation and other problems.
1. The printing process causes flower failure and eliminates the pressure between the printing plate cylinder and the blanket cylinder. The pressure of the printing cylinder is improperly adjusted. The pressure between the plate cylinder and the blanket cylinder is too large. Under the action of the squeezing force , Graphic and ink layer printing and printing failures and troubleshooting, squeezing, dot deformation and elongated, graphics and lines are blurred, the level is not clear, the layout will be blurred, causing printing and printing.
Removal method: Adjust the drum liner according to the standard, and use the minimum pressure evenly on the basis that the graphic imprint is strong enough.
⑵ Water roller and plate pressure The pressure of the water roller and plate cylinder is improperly adjusted. When it is too heavy, the water roller will jump and rub when it touches the plate. The graphic foundation of the plate and the hydrophilic layer are worn to cause the pattern; too light When the water supply is difficult, the layout cannot get enough water, and the loss of water and ink balance causes flower paste and printing.
Remedy: Adjust the pressure between the water roller and the printing plate according to the standard, wash the water velvet cloth, remove the remaining oil stains, and replace with a new water roller if necessary.
(3) Improper pressure between the ink roller and the printing plate or the aging of the ink roller surface, improper adjustment of the pressure between the ink roller and the printing plate cylinder 1, when it is too heavy, the printing plate trachoma is worn, the hydrophilic foundation is damaged, and the plate is pasted; if it is too light, Loss of ink supply, poor ink delivery.
In the same way, the aging of the ink roller also loses the good ink transfer performance, which makes the plate surface suffer from insufficient ink and prints. These factors cause the printing to bloom.
Remedy: Adjust the pressure of the ink roller to maintain good ink transfer. When the surface of the ink roller is aging, the surface aging layer should be wiped off. Generally, the aging layer is wiped with gasoline and kerosene mixed with pumice powder. When the aging is serious and cracked, it should be placed on the grinding machine to grind one layer or replace it.
Under the effect of squeezing force, the oleophilic foundation of the layout is destroyed, and the ink and ink balance is lost and the pattern is printed. In addition, the acidity is too strong, the inorganic salt layer cannot be formed on the surface of the plate surface, which destroys the water-ink balance and pastes the plate, causing printing to bloom.
⑵The acidity of the fountain solution is too weak. Phosphate precipitates cannot be formed on the surface of the printing plate. The inorganic salt layer cannot be replenished in time. The solution lacks its proper oil resistance. The plate surface cannot form a water-ink balance. The graphic part diffuses to the blank part. Flower paste version, causing printing to bloom.
Remedy: reduce or increase the acidity of fountain solution in order to keep the balance of water and ink on the plate surface.
(3) The amount of glue added to the fountain solution meets the hot season to ensure the stability of the blank part. A certain amount of gum arabic is often added to the fountain solution, which is undoubtedly beneficial to the balance of water and ink on the layout. However, the excessive addition of glue will cause the glue to be adsorbed on the surface of the ink roller, forming a hydrophilic colloid layer, making the surface of the ink roller hydrophilic and oil-resistant and deinking. The amount of ink and the printing plate cause the printing to bloom.
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