High-line flexible printing requirements for substrates

Requirements for plate, paper, paperboard, water-based ink and equipment for high-line flexible printing

1. High-line plate plate selection: For high-line printing plate, the hardness is slightly higher than the printing plate required for general printing. This is because such a printing process requires a small amount of ink in order to accurately represent fine dots. If the printing plate is too soft, it will lead to excessive transfer of ink, which is unfavorable to the control of the amount of ink, and is prone to defects such as color cast, blocking of the net, and the like. In addition, it is also required that the plate material has a good dot reproduction range, can produce fine high-gloss dots; has a uniform thickness, good flatness, easy to achieve light pressure printing, easy reproduction of the original; there is a good Elasticity, can restore the original thickness after pressing, and the plate must have a certain degree of toughness, fine mesh points are not easy to wear and so on. The plates commonly used for such printing are DuPont's TDR.

2. Cardboard: It is best to use coated whiteboard to achieve the same effect as offset printing. Because the coated white paper has a better finish, the print is more glossy and bright. Ordinary white paper surface gloss is poor, the color of the imprint is dull. In addition, coated white paper is different from offset paper and coated paper, which retains part of the original characteristics of white paper - permeability and adhesion, and is conducive to the printing of water-based ink. The paperboard can be used for cardboard with uniform thickness, smooth paper surface, moisture control of 9+2%, and good hardness. E-shaped, F-shaped or G-type corrugated, with 180g/m2 face paper. Such paperboard has low corrugation and flat cardboard, which can withstand greater pressure, reduce the appearance of lines and imprints, and improve the quality of printed products.

3. Ink: Ink is a key factor in the entire printing process. Water-soluble acrylic and acrylic emulsions are formulated and added with a high-linking agent. For four-color overprinted high net jobs, we must pay attention to the choice of ink. The printing ink of printing and coating paper is different from ordinary ink. It mainly requires the following features: Fine fineness—clean dots and fine patterns; high gloss—bright colors and glossy; low viscosity—no blocking mesh and no ink bars , Picture and text clean, refreshing; High color content - full color, rich in content; good adhesion - anti-wear, do not fade; good leveling - uniform color, no exposed bottom; fast drying - stacking effect is good, without dragging Flowers; good overprinting - good compatibility between colors, natural and harmonious colors, rich levels.

4. Equipment requirements: (1) Scraper: The printing machine that can complete the high-line printing must have a scraper. It also requires a sealed double scraper and maintains the effectiveness of the scraper so that the ink can be accurately controlled; (2) Closed circulation ink Road: Sealing the ink path will help prevent excessive contact between ink and air, prevent certain components of the ink from evaporating, oxidizing, and dissolving bubbles, and maintain the stability of the ink composition in order to successfully complete high-quality printing; (3) High-line screen printing Ink roll: This is one of the most important conditions for high-line printing. The higher the number of reticulate lines, the higher the printable mesh line, and the smaller the amount of ink to be transferred, which helps to reproduce tiny high-gloss dots; (4 ) Suction and paper feeding, full absorption of paper: It can improve the flatness of paperboard, smooth the paper, ensure the accuracy, and ensure the accuracy of registration; (5) The liner (lining between printing plate and plate roller): better lining The pad cushions and adjusts pressure to protect small dots and increase plate life.