What is the wax resistance of ink? The resistance of the ink to the wax melt is called the wax resistance of the ink. For example, in the packaging and printing of bread, candy, popsicles, ice cream and other products, most of them need to be coated with a wax solution above 80°C. to protect the food. If the wax resistance of the ink used is relatively weak, after the coating process, the imprint will produce discoloration and bleeding, which will affect the appearance and packaging quality and internal quality of the product.
As an essential element of printing, ink must meet the following physical properties during use:
1. Fineness. The fineness of the ink refers to the size of the ink pigment particles. The fineness of the ink is unqualified, and the phenomenon of edge swell, smearing and dot enlargement will occur when printing dots. The finer the fineness, the stronger the ink color, and the better the printing effect. The denser the ink during printing, the greater the viscosity and the less fluidity of the ink.
2. Water resistance. The water resistance of the ink refers to the ability of the ink to resist water infiltration, and the water resistance of the imprint refers to the water resistance of the ink film.
3. Acid resistance. The resistance of the ink to acidic substances is called the acid resistance of the ink. The acid resistance of the ink depends on the acid resistance of the pigments and binders used in the ink. For example, when printing packaging paper, cartons and other printed materials, if the acid resistance of the ink is poor, the use of acidic adhesives or the use of acidic packaging materials, etc., will lead to fading or discoloration of the print, resulting in depreciation of the product and affecting sales.
4. Alkali resistance. The resistance of the ink to alkaline substances is called the alkali resistance of the ink. The alkali resistance of the ink mainly depends on the alkali resistance of the pigments and binders used.
5. The light resistance of ink refers to the resistance of the color of the ink film to sunlight. In general, fully lightfast pigments are not available under current technical conditions, only the lightfastness is different. After the ink is printed on the surface of the substrate, the color will gradually change under the action of light. This is because the pigments in printing inks undergo chemical changes under sunlight exposure, so prints with good lightfastness will last longer.
Ink wax is used to control the working performance and drying performance of printing ink, and improve the anti-scratch performance. It forms a flocculent structure inside the carrier, which can promote the high pigment content of the ink and make it viscous and avoid the ink being too thick. Or when the permeability is too large, the printed matter appears blurry.
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