Mention ink, in fact, there is a more professional is plastic ink, this ink may not be common in ordinary life, but the staff engaged in the printing industry is very frequent contact with this type of product. It shows the effect and reading age contact with books inside the word is very similar, but the scope of plastic ink application is not in books, but the implementation of some more complex industries.           Plastic ink is mainly suitable for rotary intaglio press. The substrate is qualified polyethylene film, polypropylene film, polyester film, etc. treated by corona discharge, flame and other methods. Good quality plastic ink needs to have the following conditions: first, plastic ink printing adaptability, strong fastness to plastic film attachment, fast drying speed, printing text color, luster excellent. Two, plastic ink is volatile drying type, according to different printing models, printing speed can be 40-160 meters/min.           Classification of plastic ink. a, plastic gravure ink. Plastic gravure ink is generally used for printing PE, PP, OPP, NY and other plastic film ink, but it can also print composite flexible packaging. As long as no large color blocks in the printed page have been tested by rewinding cold air, the composite odor and fastness are basically OK. Plastic gravure surface printing ink is mainly made of bonding material, polyamide resin, plus pigments and additives through grinding and filtering. The softening point of polyamide resin is controlled at 121 degrees, otherwise the printing will appear adhesion in the mildew and rain season because of the low softening point of resin. Resin softening point is high in winter use will freeze, it needs to be heated mix, make it dissolve. Plastic gravure surface printing ink dilution solvent is toluene, isopropyl alcohol, xylene, butanol, etc. Some ester solvents can also be added in time to adjust the viscosity of ink. Toluene and isopropyl alcohol are quick-drying solvents. Xylene, butanol is a slow drying solvent. In the use of butanol should pay attention to, if the ink drying too fast, resulting in the loss of graphic dot, appropriate to add butanol to make ink reproducibility, fine print and dot clear, but more will cause ink dry, especially in the season of mildew and rain will appear in print adhesion anti stick. Plastic intaglio printing ink, also known as composite ink, refers to the printing ink in the substrate. b, PS special ink. PS special ink is mainly used in polystyrene (PS). At the same time, it is also suitable for plexiglass, ABS, PS robe products. It has the characteristics of high hiding power, no corrosion substrate and natural volatilization drying. Under normal temperature conditions, surface dry only 15 to 30 minutes, practical 6 to 10 hours. Thinner can be selected Ⅱ special agent. c, highlight PP ink. Highlighter PP ink is mainly used in polypropylene sheet and its products. It has the characteristics of free treatment, high gloss, good adhesion, high surface hardness and scratch resistance. Thinner can be used special Ⅰ. d, PET plastic ink. It is widely used in the labeling industry. Mainly suitable for PET adhesive, decal industry, water transfer printing industry. e, PVC ink. Mainly suitable for PVC sheet, tube, sheet, PC, ABS, blowing up toys, acrylic, paper, wood, imitation nylon. When choosing diluent, also need to choose according to different temperature.