Water-based inks in corrugated paper printing (2)

Considering the printing characteristics of the corrugated paper and the characteristics of the water-based ink, the following formulas of two water-based inks for corrugated paper printing are listed (for reference only).

Formula 1

raw material

Quality percentage/%

Acrylic resin Joncryl 67

6

Ammonia (28%)

0.31

Monoethanolamine

0.48

Diethylaminoethanol

0.72

Isopropanol

2.4

water

14.09

Inorganic pigment

36

Styrene acrylic dispersant Joncryl 87

35

Microcrystalline wax jonwax 22 emulsion

5

Formula 2

raw material

Quality percentage/%

Acrylic resin Joncryl 67

6

Ammonia (28%)

0.8

Morpholine

0.5

Isopropanol

2

Dibutyl phthalate

0.6

Cellosolve

0.6

water

24.5

Inorganic pigment

40

Styrene acrylic dispersant Joncryl 87

20

Microcrystalline wax jonwax 22 emulsion

5

3, some problems in the use of water-based ink printing corrugated paper

(1) The flexographic printing uses anilox roller to transmit ink, and the net space is small. A water filter should be added to the water-based ink drum to prevent the damage of the anilox roller from impurities and the like.

(2) The texture of water-based ink should be fine, the color should be bright, and the viscosity of the ink should match the printing speed.

(3) The water-based ink used for corrugated paper printing, its connection material is the oil-water miscible system formed by resin and water under the action of surfactant, and the stability of the system is poor. The stability of aqueous ink depends on the size of its pH. When the ph value drops to about 7.8 or lower, the ink begins to become cloudy and thickened, tends to conjunctiva, and hinders the normal ink transfer. Alkaline too strong, has an effect on the anilox roll, generally ph value is controlled at 8~9. Water-based ink is alkaline, similar to soap solution, easy to blistering.

(4)Before use, it must be fully stirred to keep the ink composition even; after opening, the ink should be stamped and sealed immediately to prevent it from dropping off and the crust should be dried and solidified; the remaining ink containing impurities should be filtered first and then be equipped with new ink. Use it together; during storage, avoid exposure to high temperatures or intense sunlight. Store under normal conditions for one year without deterioration.

(5) Reasonable use of ink additives. There are many kinds of additives for water-based inks, and they must be used correctly according to the specifications and experience. Before formal printing, inks should be formulated by considering various factors such as printing conditions, surface characteristics of substrates, ambient temperature and humidity, and water-based ink storage time.

At present, in the printing of corrugated board, water-based ink has occupied a dominant position, its printing quality has been recognized by people, and its pollution is small, so more and more applications. At present, water-based ink still has some problems to be solved, especially its drying speed. However, with the development of ink technology, the development prospect of water-based ink is still bright.