New ink drying method introduced

Business Club, June 16. Thermal Polymerization Drying This type of ink must be heated to undergo polycondensation and cure. Heat curing ink is a mixture of resin and curing agent, and then printed and heated to make the resin react to form an ink film. This kind of ink is called heat polymerization ink. The advantages are one-liquid type, solvent-free, stable viscosity before heating, good fastness and resistance to printing on the printed product, and the disadvantage of high energy consumption. The curing speed of this ink depends on the content of the catalyst and the heating temperature. When no catalyst is added, the ink needs to be cured at a temperature higher than 150 degrees. After the catalyst is added, it can be cured at an intermediate temperature, but the catalyst content is large and the ink is not convenient for preservation. The physical properties of this ink's hardened ink film are very good, mainly for metal and plastic printing.

2. Colloidal drying uses colloidal dried inks with plastisol inks. This kind of ink disperses polyvinyl chloride together with pigments in plasticizers. After printing, the polyvinyl chloride particles expand under the action of plasticizers and gel to form a plasticized polyvinyl chloride film. dry. Plastic silicone inks can be used as foaming inks, printing and dyeing inks, and fiber inks.

3. Filtration Drying The combination of osmotic drying and gel drying for drying is called filtration drying. When the coating is printed with a fast-drying ink, the low-viscosity petroleum solvent in the binder is quickly absorbed into the coating by capillary action of the coating. The resin components that have been expanded into a gel form contain the pigment particles therein, remain on the paper, and the ink cures.

4. Wet-drying We print on paper with wet-curing ink and blow in water vapor. The moisture in the air or the moisture in the paper is absorbed by the ink. The resin dissolved in alcohol at the same time precipitated and precipitated. The ink begins to dry, and the water eventually evaporates out of the paper due to volatilization. When using this type of ink, special attention should be paid to picking the proper ink roller.

5. Precipitated drying Precipitated drying inks are made by dissolving high acidity resins in alcohols. The resins used must have limited solubility with water, but they will precipitate immediately beyond the limit, typically rosin modified horses. To acid resin. Commonly used alcohol solvents such as ethylene glycol. The drying of the ink is performed with water as a precipitant, so the solvent used for the ink must be able to mix with water in any ratio.

6. Condensation drying wax inks are very important cold-set inks. For example, a carbon-carbon ink is heated and printed, is a solid at normal temperature, and when printed on a voucher printing machine, it is heated and melted to have fluidity, and can be printed with a relief plate or a lithographic plate, and is condensed and dried through a cooling roller.

7. Microwave Drying Microwave drying is also a means of heating the ink to dry it. Under the action of the microwave electromagnetic field, the heated media molecules become polarized molecules with positive and negative charges. These polarized molecules vibrate with the change of the electromagnetic field, and the temperature also increases.

8. Unlike the previous two-component reactive curable inks, the reaction-curing type of ink, when the ink comes into contact with paper, reacts with a certain component of the paper to dry and solidify. This reaction exists on the coating layer on the surface of the ink and paper, so that the ink cures rapidly and there is no problem of volatile pollution. However, inks and papers that can react with each other must be selected for printing.