Ink is an important material used in printing. It prints or sprays patterns and texts on substrates. Ink includes main ingredients and auxiliary ingredients, which are evenly mixed and repeatedly rolled to form a viscous colloidal fluid. It is composed of binders (resins), pigments, fillers, additives and solvents. It is used for various printings such as books and periodicals, packaging and decoration, architectural decoration and electronic circuit boards. As social demand increases, the variety and output of inks are also expanding and growing accordingly.
1 Fast-fixing glossy offset printing ink
Fast-setting glossy offset printing ink is composed of pigment, binder, desiccant, anti-fouling agent and other additives. The binder of this ink is composed of synthetic resin, vegetable oil, high-boiling point kerosene and a small amount of colloid oil. The synthetic resin is a rosin-modified phenolic resin and tung oil acid-modified phenolic resin oil with high melting point and high viscosity. The former has the characteristics of fast hard resin fixation speed, and the latter has the characteristics of good gloss of soft resin film.
2 Offset web ink
Offset rotary ink is used for web offset rotary presses with a printing speed of 25,000 to 30,000 r/h. According to the different papers used, it is divided into non-thermosetting offset rotary ink and thermosetting offset rotary ink.
1). Non-thermosetting offset rotary ink is made of pigment, synthetic resin with high solubility and high-boiling point kerosene with a narrow distillation range. The viscosity of the ink is low, and it is quickly fixed and dried by the capillary penetration of the paper. It is suitable for printing the main text of color newspapers and books with highly absorbent newsprint and letterpress paper.
2). Thermosetting offset rotary ink has similar ingredients to non-thermosetting offset rotary ink, but the printed product must pass through the heating device attached to the printing press to allow the air to take away the kerosene solvent with a boiling point of 230 to 270°C, and the remaining pigment-resin will thicken and fix. The drying of the ink depends on the volatilization of the solvent on the one hand and the thermal curing of the resin on the other. This ink is suitable for printing color newspapers on coated paper.
3 Glass screen printing ink
The surface decoration, scales, and text of glass products are mostly screen printed. The ink used for screen printing on the surface of glass products is called glass glaze. The process of glass glaze decoration is generally: glass glaze preparation → screen printing plate production → screen printing → baking (firing) → finished product inspection → packaging.
Glass glaze has three components, namely base glaze, colorant and printing oil. The mixing of these three components is a simple physical process, and there must be no chemical reaction between the various components. The fine powder of base glaze and colorant is mixed with liquid printing oil to form a suitable paste, which can be used as printing ink in the usual sense.
4 Metallic Screen Printing Ink
The requirements for screen printing inks for metal signs are strong adhesion, good wear resistance, clear graphics after printing, fast drying and no blocking. Metal sign screen printing inks are generally special inks made of synthetic resins such as alkyd and phenolic as binders, and some pigments, additives, etc. are added. This ink has good printing performance and can be dried naturally after printing or baked at 120°C for 2 hours. The surface of the ink film is bright and three-dimensional, and has excellent bonding and wear resistance with aluminum plates. The ink film of this ink is tested with a JM-1 paint film abrasion tester. The rubber grinding wheel with a load of 750g can be pressed and ground for more than 500 times, and the cloth wheel can be ground for more than 5,000 times.
If you print color signs, you can refer to the color samples of color printing inks to match the ink. When adjusting, you should add an appropriate amount of ink oil and desiccant. The amount of ink desiccant added is about 5%~8% of the total amount of ink. If you add less, it will not be easy to dry, and if you add more, it will affect the adhesion of the ink.
There are many inks that have not been introduced. Our company has resins specifically suitable for these types of inks. Welcome to the official website for inquiries.