Four drying methods of the hottest ink

2022-08-08
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Brief introduction of four drying methods of ink

first, osmotic drying

this kind of drying mainly depends on the absorption of paper and the penetration of ink. The mechanism can be explained as follows: because the paper is made of fibers intertwined into porous, it will cause the sensor or fixture material to be damaged, and the aperture is very small. When the ink is transferred to the paper, due to the capillary effect of the paper fiber gap, it begins to absorb the binder in the ink. In the absorption process, the composition and rheological properties of the ink gradually change, the liquid composition of the ink gradually decreases, the cohesion of pigment particles gradually increases, and the ink gradually loses its fluid properties and presents a solid form

II. Oxidation conjunctiva drying

this drying form uses oxidative polymerization to transform the ink from liquid to glass magnesium plate JC688 ⑴ 998 solid. The mechanism is that the dry vegetable oil in the ink contains unsaturated double bonds, and the polymer film is synthesized by peroxide bridging. During the induction period of drying, the dry vegetable oil contains a small amount of phospholipid organic antioxidant, which absorbs less oxygen, and the oxidative polymerization reaction is very slow. When the antioxidant is destroyed, the dry vegetable oil absorbs oxygen to make the methylene adjacent to the double bond react with oxygen to produce hydrogen peroxide. Because the peroxide of hydrogen is very unstable, it will be separated into two free radicals under light, one of which is carboxyl oh. Because the chemical properties of free radicals are very active, when they go to but more penetrate into high-end products to attack another oil molecule, they produce a new free radical, and the original free radical will produce stable compounds. From this, small molecules of oil will polymerize into macromolecules until there is no double bond. The ink becomes a polymer like dry solid film

III. volatilization drying

this drying form is completed by volatilizing the solvent that officially landed the ink binder Sichuan gonggaxue new material in the new third board, so that the remaining resin and pigment form a solid film and are fixed on the surface of the substrate. Mostly used for gravure ink. The speed of evaporation and drying mainly depends on the latent heat of evaporation of the solvent, the proportion of pigments, the radius of particles and different resin types

IV. other drying forms

1) radiation drying

radiation drying refers to the drying form in which ink changes from liquid to solid by polymerizing the molecules of binder relying on the energy of rays. Including:

a: UV drying

b: electron beam drying

c: infrared drying

d: microwave drying

e: wet solidification drying, condensation drying, precipitation drying, filtration drying, etc

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