The characteristics of protective rubber and analysis of its use

The protective glue is a kind of transparent glue liquid made of natural glue or synthetic glue liquid, which can protect the graphic part and non-graphic part of the printing plate, and prevent the plate from oxidizing the dirty liquid. Common protective gums are gum arabic and new polymer gums.

1, the characteristics of protective plastic

(1) Corruption. In a hot and humid environment (Arabica gum use temperature is -5°C~45°C), Yeast bacteria are easily propagated and fermented in Arabian gum solution, free arabinic acid, and change gum properties. This is the general nature of sugars, and it is also the reason that gum arabic and long-term use will cause rancidity. As the temperature rises, the acidity increases, and the corrosiveness of the metal printing plate increases, and it is easy to lose edition. Al2O3 falls off. This is especially important in the summer, keeping the protective rubber away from heat.

(2) Hydrophilicity. The molecular structure of gum arabic consists of -COOH and -OH attached to the same hydrocarbon bond. These two functional groups are hydrophilic and the hydroxyl group (-OH) is more likely to accept moisture than the carboxyl group (-COOH). So when the gum arabic is dissolved in water, it will dissolve in the process of diffusion-absorption-swelling for about 72 hours to form a molecular solution of the dispersion system. The hydroxyl groups in each molecule are extremely hydrophilic and can be in water. Automatically dissolves into a single-phase stable system that neither condenses nor precipitates, ensuring long-term dispersion stability.

(3) Weakly acidic. Peach gum contains arabic acid (XCOOH), its aqueous solution is weakly acidic, and it reacts with metal or metal oxides to produce arabinates in the presence of alkali and releases hydrogen gas, which has good adsorption.

2, the role of protective plastic and use methods

It has the effect of improving the hydrophilicity of the non-graphic part, preventing the printing of dirtiness, protecting the layout, and preventing scratches.

Hand sizing: Use collagen and water to dilute 1:1. A suitable amount of gum (about 45 ml of 1 m2) was poured on the plate surface, and then uniformly coated with a cellulose sponge, and the excess glue was wiped off with a dry cloth and then dried.

Machine gluing: Use collagen and water diluted 1:3. The drying temperature should be controlled below 70°C, generally between 60°C and 65°C.

Special Note: The glue applicator without a supplementary construction should be replaced every three days. The glue applicator with a supplementary configuration should be changed once a week. The lower the protective colloid concentration, the better the ink repellency at the time of printing, but it is easily bumped and dirty. Conversely, if the concentration of the protective gel is too high, it is likely to cause poor inking.

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