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Look over! Teach you to quickly identify gravure gold silver ink
Like other inks, gold and silver inks are mainly composed of two parts: pigments and binders. Simply put, gold inks are made of gold powder and gold oil, and silver inks are made of aluminum powder and silver oil. Made.
(1) Pigment
We know that pigments are colorants in inks, which give inks a certain color, and the pigments in gold and silver inks are ground from metal powders, mainly gold powder and silver powder. The pigment in the gold ink is gold powder. It is actually a powder made of copper and zinc alloys. The zinc content in the gold powder is generally 8% to 30%. Among them, the gold ink color with a zinc content of 8% to 12% Reddish, customarily called red gold, and the color of gold ink with a zinc content of 20% to 30% is bluish, generally known as green gold, and between red gold and green gold is called green red gold. In gravure printing, 800-gold gold powder is generally used for the preparation of gold ink, and the surface of the gold powder particles are mostly covered with surfactant, which can better combine with the resin binder.
Silver powder is actually aluminum powder, which is composed of 65% flake aluminum powder and 35% volatile hydrocarbon solvents. The specific gravity of aluminum powder pigment is small, and it is easy to float in the liquid. The silver ink used in gravure silver ink is a floating silver powder with floating ability in the connecting material. Silver ink generally uses 400 ~ 1000 mesh silver powder. If silver ink is printed on a large area, lower mesh silver powder can be used. For example, 400 mesh silver powder is used to modulate silver ink, which has a high metallic luster after printing.
(2) Connection material
The binder is a liquid component in the ink. On the one hand, it is the carrier of the pigment, so that the powdery pigment particles can be uniformly dispersed in it. On the other hand, it also acts as a binder, so that the pigment can finally be fixed on the substrate. Material surface. The linking material largely determines the viscosity, viscosity, fluidity and drying performance of the ink. Therefore, the quality of the linking material directly affects the performance of the ink.
The connecting material used in gold and silver inks is a special ink-adjusting oil, generally called gold-adjusting oil or silver-adjusting oil, which is mainly called auxiliary materials of oil, resin and organic solvent. The connecting material of gravure gold and silver ink should meet the following conditions:
â‘ Must have sufficient viscosity to combine well with gold powder or silver powder;
â‘¡Transparency must be high, and can not affect the hue of gold and silver ink;
â‘¢The acidity of gold-adjusting oil or silver-adjusting oil should be low, otherwise it will cause chemical reaction of gold powder or silver powder;
â‘£Gold-adjusted oil or silver-adjusted oil should also have quick-drying and fast-fixing properties, to prevent the back of the printed matter of gold ink or silver ink from sticking.
In short, different printing requires the selection of the corresponding ink, and it is never allowed to substitute different inks. Only by choosing the right ink and adding proper operation can we produce excellent printed packaging products. The manufacture of flexible packaging is a series of processes, and the printing of flexible packaging is a key process. Only by mastering the technology of gravure printing and understanding the standard operation of gravure printing can we produce excellent packaging and decoration products.