The manufacture of ink is a complex chemical engineering. Its materials involve organic macromolecular synthesis and redox, diazotization, displacement reaction, complexation reaction and other chemical changes. At the same time, related to mechanics, optics, color science, surface chemistry and other materials.
The first is the manufacture of various pigments and the manufacture of fillers. The second is the manufacture of various synthetic resins and the production of various types of binders (dissolving solid resins in vegetable oils, mineral oils, solvent media). The third is the manufacture of ink. These three processes are interrelated and interact with each other and are indispensable. It should also be pointed out that the ink auxiliaries are also produced independently.
The production process of pigments, resins, and binders is very complicated. Due to lack of space, it is omitted. Only the ink manufacturing, the introduction is as follows:
Process:
Formulation design (including reinjection proofing in production) → Batching (pre-dispersion) → Grinding and dispersing → Inspection (class-level, workshop-level, plant-level) → Loading, barrels → packaging (packing, labeling, Mark)) Finished product.
Formula design, this work is carried out by experienced engineering and technical personnel, according to the requirements of the printing type, type of printing machine, printing object, printing process, etc., the ink formulation is tested and designed, the various conditions are verified, and after confirmation, the establishment is established. Standards, setting control indicators, selecting equipment, specifying processes, submitting production.
Various ink basic recipes:
1. Lithographic ink formulation (%)
Gelling agent 10-20
Synthetic resin oil A 50-60
Synthetic resin oil B 12-18
Pigments 13-20
Filler 8-15
Ink additives 2-5
Ink oil 5-7
Total 100
2, letterpress ink formula (%)
Pigments 11-19
Color adjustment agent 1-3
Filler 15-20
Synthetic resin oil 55-60
Mineral oil varnish 11-16
Ink additives 4-8
Ink oil 3—5
Total 100
3, gravure ink formula (%)
Resin 35-40
Pigments 8-16
Filler 2-5
Solvent A 30-35
Solvent B 15-20
Ink additives 10-20
Total 100
4, filtered version of ink formulations
Pigments 8-10
Filler 20-30
Paste ink 50-60
Synthetic resin oil 14-20
Additives 8-10
Total 100
This is for the printer to have a general understanding of the ink. As for the specific formula and quality requirements, it is more complicated. It is not possible to elaborate here. See other related materials.
Reload proofing, this work is to organize the production of ink, according to a slight change in raw materials, color preparation and ink mix. The general principle is to follow the standard. It is generally called looking for and finding ink. This is done by more experienced technicians, often and constantly.
Ingredients (pre-dispersion) process, this work is performed by senior skilled workers. The components specified in the ink formulation were accurately weighed and added to the container in order, proceeding well. Stir with high-speed stirring and variable planetary stirring. In this process, the linking material is preliminarily moistened with the pigment interface, and the large aggregates of the pigments are broken up, and the air, moisture, etc. adsorbed on the surface of the pigment particles are discharged, and the pigment aggregates are gradually loosened.
The grinding and dispersing process is to uniformly disperse and uniformly wet the ink, and then through the grinding equipment, further mix, moisten, disperse, and reach the required degree of dispersion (fineness). That is, the aggregates of the pigment are gradually broken up again, so that the binder is wetted and wrapped until almost evenly dispersed particles are evenly distributed between the binder molecules.
Grinding equipment has three rollers, horizontal ball mill, vertical ball mill, sand mill and so on.
Grinding and dispersing is a key position in the manufacture of inks. The skills of skilled workers can be fully revealed.
The technical specifications of the inks tested are as follows: color, tinting strength, gloss, viscosity, viscosity, fluidity, fineness, drying time, flying ink, viscosity increase, fixing time, adhesion, acid resistance, alkali resistance, light resistance, water resistance, resistance Alcohol and other solvents. There are other special indicators for inks with different characteristics.
The product is self-inspected, workshop inspection, factory inspection, and confirmed to be qualified.
The packing work is to reinforce the barrel, listen to the seal, paste the trademark, and pack it. The product name, lot number, net weight, gross weight are indicated. Production unit. Can be delivered for sale.
Source: 21st Century Fine Chemicals Network
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