Development trend of the hottest gravure ink

2022-08-18
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Gravure ink development trend

1 With the continuous improvement of domestic people's living standards, packaging and printing have developed by leaps and bounds in recent years. The introduction of printing equipment, the improvement of plate making equipment, and the improvement of printing ink have brought people's refinement of printed matter packaging bags, and raised people's awareness of environmental protection. As an ink, its basic function is to give people the information they need through certain equipment

1) classification of inks

in order to meet the needs of various printing methods and printing purposes, there are many kinds of inks, with different physical and chemical properties and great differences in performance. Clear classification is the premise of using inks well

① classified by drying method. When the printing ink is transferred from the printing plate to the substrate and transmitted to the computer print surface through RS232, the ink will change from liquid to solid film, which is the drying of the ink. The drying of the ink has both physical and chemical effects

a. oxidation polymerization dry ink. The resin in the ink reacts with oxygen in the air to solidify and crosslink the resin to form a like structure and dry

b. penetration drying ink. The ink penetrates into porous materials such as paper and dries

c. volatile dry ink. This kind of ink contains a large number of volatile solvents. After printing on the surface of the substrate, the solvent volatilizes to the atmosphere, and the remaining resin and pigment in the ink form a solid film and adhere to the surface of the substrate

d. radiation drying can be used to control the production quality of conditioning materials and process objectives of dry ink. Radiation drying is a drying method in which the molecules of the ink binder are polymerized by the energy of the radiation line to change from liquid to solid. It is mainly that some substances in the ink absorb energy to produce free radicals, which cause the unsaturated double bond reaction in the ink resin to crosslink and cure

e. other dry inks. There are many other drying methods, including wet solidification drying, condensation drying, precipitation drying, two-component reaction drying, gelation drying, etc

② classification by printing method

a. lithographic printing ink

b. relief printing ink

c. flexographic printing ink

d. gravure printing ink

e. hole printing ink

③ gravure printing ink classification. The inks used for gravure printing are mainly classified according to their uses, including publishing inks, packaging inks and industrial inks

the ink used in composite flexible packaging materials basically belongs to the category of packaging and printing ink, which is our most concerned variety

(2) composition of ink

printing ink is a paste colloid formed by evenly dispersing and mixing materials such as pigments, connecting materials and fillers. The pigment endows the printing with rich and colorful colors, the connecting material is used as the carrier of the pigment, and also as the adhesive to surround the pigment on the surface of the substrate, and the filler endows the ink with appropriate properties, so that the ink can meet the printing suitability of various printing processes. The liquid components in the ink are called binders, solid pigments and various additives

gravure printing ink is roughly composed of 5% ~ 15% pigment, 20% ~ 40% binder resin, 0% ~ 60% solvent and 0 ~ 5% additives

2. Current situation of ink at home and abroad

1) domestic gravure ink

at present, domestic surface printing ink is divided into ink for general flexible packaging (such as shopping bags, maternal and infant health products) (the ink is mainly made of benzene soluble polyamide resin PA), ink for cigarette packaging (mainly made of nitrocellulose resin NC) and paper box ink (water-based ink). Among composite inks, more than 70% are BOPP special inks based on chlorinated polypropylene (CLPP), and 10 - 20% are polyurethane (PU) inks, Others are PVB alcohol soluble inks. Due to price and other factors, different materials and different packages use different inks. For printing plants, there are many kinds of inks, many inventories, and delivery is also very easy to delay

2) foreign gravure inks

Japan, Europe and the United States have different packaging requirements, so the ink system is also very different. A small number of advertising newspapers and periodicals in Japan are rotary flexographic printing. The majority of sanitary products are intaglio printing (ink gradually changes from benzene containing to benzene free (aliphatic hydrocarbon solvent) system, cigarette bags are also mainly intaglio printing, composite packaging bags are benzene soluble polyurethane (to benzene free) system, CL PP system has basically disappeared, in the field of composite packaging, general-purpose ink accounts for a large proportion, in Europe and the United States, in addition to composite packaging bags, others are mainly flexographic, (water-based or alcohol soluble) even composite packaging is mainly alcohol soluble NC + Pu, Therefore, this scheme is very common in European and American color paste + resin solution

3) development trend of domestic gravure inks

in recent years, domestic ink consumption has been increasing at a rate of 10 - 20% by injecting clean and dry kerosene. At the same time, the growth of high-grade inks is much higher than that of low-grade inks. It can be predicted that people's requirements for ink quality will exceed the price in the near future. At the same time, while constantly introducing printing equipment, people will also try to use foreign management models to manage their own workshops, and gradually integrate with developed regions

it can be predicted that with the development of universal ink or color paste + resin liquid system, the production of ink will also take a further step in the direction of large-scale production. The final mode will be: on the one hand, mass production in the workshop; on the other hand, all-weather technical services of ink residents in the printing plant

how to achieve the goal still needs a long process. It is not realistic to take one step to the final state. At present, there are already some large printing plants doing this work, and we are also cooperating. It is foreseeable that there will be a satisfactory harvest in the near future

reprinted from: China packaging daily

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