On the difference between alcohol dampening and water dampening

As everyone in the printing industry knows, offset presses can be summarized as: two types: water dampening and alcohol dampening.

Moisturizing version: As the name implies, water is the main component, auxiliary material: wetting powder.

Alcohol dampening: the main component is still water, and auxiliary materials: dampening solution and alcohol. Among them, alcohol (also called ethanol), which is used in printing as isopropyl alcohol, its main function is to reduce the surface tension of moisture.

Water-based version: water, wetting powder, iron bar (water rubber sleeve); alcohol-based version: water, fountain solution, alcohol, rubber-based water-based glue.

The water dampening machine is suitable for products with low speed and relatively low printing quality requirements. Its advantages are: material saving, environmental protection, and low air pollution to the workshop.

Alcohol dampening machine is suitable for products with high speed and relatively high print quality requirements. Its advantages: full dots of printed products, vivid images and easy balance of ink and ink.

Water-based version: The water-based rubber cover needs to be covered with a water-based rubber cover. The role of the water-based rubber cover is: 1. To reduce the impact and friction between the water glue stick and the plate cylinder; , Effectively absorb excess water on the surface of the printing plate. Here I recommend the chemical fiber texture of the water rubber sleeve, the reason is not explained.

Alcohol dampening: relying on the water-based rubber for the rubber texture, its role: 1, better reduce the impact and friction between the plate cylinder and the water rubber roller than the water rubber sleeve, 2, make the water evenly coated on the printing plate . Because of its rubber texture, the amount of deformation is larger than that of the water rubber sleeve, which can effectively squeeze excess water from the surface of the printing plate. However, it is used in high-speed machines, so what about the residual moisture on the printing plate? For this problem, our great inventor came up with a method that can directly remove the residual moisture on the printing plate-that is, adding alcohol (isopropyl alcohol), because alcohol is volatile, so when the machine is running at high speed, the moisture is coated After being laid on the layout, the volatilization of alcohol will take away the residual moisture of the layout and better achieve the balance of water and ink.

Summarize the role of auxiliary materials:

Wetting powder: to make the water fine and fine, it can make water form a water film on the surface of the printing plate, and the ultimate goal is to maintain the balance of water and ink. Disadvantages: In the case of uneven mixing, there will be a small amount of powder that cannot be fully dissolved, hurting the printing plate. Remember: do not put more.

Fountain solution: to make the water quality fine, it can make water form a water film on the surface of the printing plate, and the ultimate goal: to maintain the balance of water and ink. Disadvantages: the price is too expensive, the printing cost is too high.

Opportunities and tricks, the secret of emergency techniques:

If the wetting powder is used up, it is night and there is nowhere to buy. You can use pure water. The machine can adapt to the water quality without the wetting powder in a short time. If the water rubber sleeve is damaged, it is also at night, you can use needle thread to sew it. If it is dirty, you can remove it and clean it with gasoline and water. It is best to use a brush to roughen the surface.

If the fountain solution is used up at night, you can use moisturizing powder instead. If the alcohol is used up, you can use liquor instead. Erguotou, Lanshuanggou and Gaogou Daqu are best.

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