Dot enlargement problem how to solve the offset printing process

Printing in the network increase phenomenon is inevitable, but you can control. Normally, coated fine print dot increases value must be less than 12%, general printing quality to less than 18%, newspaper printing are controlled within 35% (50% generally refers to the network). In the process of production, can effectively control from the following several aspects.
1. Select high-quality materials, reasonable control the exposure time and solution concentration
Drying plate picture and text clear, network system, can guarantee the network transfer effect, and can guarantee the plate have higher resistance force. Usually to ensure that 5% of the dot is not lost, 95% of the dot is not blurred.
2. Strictly control the printing ink in the balance
In the process of printing, if water supply is too large, can lead to a layout for the ink to increase, the ink layer thick, ink emulsification is severe, causing imprinted dim without burnish. Boot in production process, in order to reduce waste, usually in the boot will be increased to 150% of the normal water level, after the normal printing, water should be gradually reduced to normal, guaranteed by clear, saturated luster.
3. All kinds of printing pressure control in a reasonable range
The plate cylinder and rubber roller pressure control between 0.15 ~ 0.20 mm, and make sure that two parallel version of the ink roller and the plate cylinder, under 100 mm in diameter on edition, ink roller and printing plate cylinder pressure width is 3 ~ 4 mm in diameter 100 mm or more depends on the version of the ink roller and printing plate cylinder pressure width is 5 ~ 6 mm.
4. The correct version control run liquid concentration
Education version liquid concentration control the balance of ink and print quality plays vital role. Education version suitable concentration of liquid can quickly rushed to locations around the "dirt". If education version liquid concentration is low, dot around the ink cannot be removed, while the increase lead to network, or lead to paste version; If education version liquid concentration is too high, it will led to the decrease of the PS edition print resistant force and education version of liquid waste. Usually run version solution of pH control in 4.0 ~ 6.0, conductive value control in the 1400 us. (Gold Printing Group)
Book Printing
Printing in China
Notebooks Printing
Printing in China