Production technology of the hottest plastic gravu

2022-09-19
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Plastic gravure printing ink production process

plastic gravure printing ink is a mixed and dispersed liquid. The key to production is that the components can be fully mixed and dispersed evenly. The basic process of plastic ink includes:

1. The production of connecting material will dissolve a variety of compatible resins into a uniform viscosity liquid through solvents, and the equipment is mainly reaction kettle, etc. At present, some domestic well-known brand ink manufacturers can directly produce resins with different functions and combine them into their own unique connecting materials, such as Tianjin Toyo, Hangzhou HANGHUA, Zhejiang New Oriental and other ink manufacturers

2. dispersing and grinding: mix the pigments, connecting materials, solvents and additives, disperse and grind them into semi-finished products

3. adjustment, finished product packaging through various control means; Test various indicators and get the finished product after stabilization

ink production equipment has a great impact on the stability of ink product quality, especially the grinding quality is directly related to the use stability and printing suitability of ink. Therefore, a good ink product must be based on excellent formula, combined with advanced production technology and equipment

use of plastic inks

plastic gravure inks can be divided into surface printing inks and composite inks according to the way of printing processing in addition to the classification method mentioned above. At present, many domestic ink manufacturers can produce these two types of inks. From which aspects can we choose the inks we need? We must choose the ink based on the printing substrate film, printing conditions, product quality requirements, post-processing conditions, and end use. At the same time, we must understand the comprehensive performance of the selected plastic printing ink, including the type of ink, dilution solvent, and use conditions

1. See Table 4 for the functions and characteristics of different types of ink

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2. Viscosity of ink

the viscosity of ink has a direct impact on the quality of printing products. The viscosity of the ink in production is determined by the specific process parameters. The viscosity is also related to the temperature, humidity, speed of the printing machine, the concentration of the ink and the dilution solvent (pure high strength and shock absorption performance, solvent formula) used by cheshanshan as the largest supplier of lithium battery comprehensive materials in China. In order to print, we must control the viscosity of the ink. Too high or too low viscosity of ink will cause incomplete prints, words, patterns and dots. If the viscosity is too low, the surface printing ink will make the product not bright, scratchy, wear resistance and scratch strength weakened, and the adhesion is not enough and the color will fade. The presence of composite ink will cause incomplete layer points, poor covering power, and spots on the bottom of the printed film, especially when compounding with aluminum foil and aluminized film

among the components of polyurethane ink, butanone is the main solvent of ink, which belongs to fast volatile ink. If the volatilization speed of the ink and the solubility of the added solvent cannot be controlled, it may lead to polyurethane resin precipitation, pigment flocculation, ink precipitation, and a series of faults such as non coloring, dirty version, blooming, discoloration, etc. In order to make the solvent volatilization and dissolution of polyurethane ink parallel in the printing process, we must reasonably adjust the dilution solvent so that the ink is always in a good fluid state during printing

development of ink for flexible packaging

in China's plastic flexible packaging market, small and medium-sized enterprises account for the vast majority, and the products produced are not highly technical, or the products are similar, so the competition is very fierce. In the end, they often focus on the reduction of costs, ignoring the technical requirements and health requirements of products. The use of plastic ink in China has increased significantly, but the safety and health performance has not been correspondingly improved, and there is an obvious lag phenomenon. Aromatic solvents such as toluene are still widely used, and chloropropylene printing inks account for more than 60% of the ink market. Since China joined the WTO, the economy and trade between China and other countries have become closer. The requirement of "internationalization" has greatly promoted the development of China's plastic ink industry in the direction of environmental protection. There are quite a number of plastic flexible packaging enterprises and ink manufacturers who are passively accepting the situation rather than consciously taking the initiative. Domestic plastic packaging, ink must be linked with safety and hygiene. As far as its solvent system is concerned, it is currently developing in the direction of benzene free and alcohol soluble. In terms of alcohol soluble ink technology, Shanghai sikebai, Zhejiang New Oriental, Shanghai DIC and other enterprises are in a leading position. In terms of its connecting material technology, it is developing in the direction of polyester polyurethane system. Polyester polyurethane ink is favored by users because of its low toxicity, good printability for pet and NY materials, high temperature cooking resistance, freezing resistance, wear resistance and other excellent properties, and will gradually replace chlorinated polypropylene ink. The polyester ink of New Oriental ink company has accounted for more than 50% of the company's total ink output, and has become the company's core competitive product. As far as the pigment system of plastic packaging ink is concerned, it will develop in the direction of non heavy metal pigments. Domestic pigment manufacturers will face the risk of being eliminated if they cannot integrate with international manufacturers in this regard

gravure printing technology has been in a steady development trend since it was introduced into China, and its development prospect is promising. This is different from Europe and the United States and other countries. In China's food plastic flexible packaging, gravure printing has the absolute advantage that Vertu constellation also likes to use ceramic keyboards. In large supermarkets, food and commodity packaging that shine in people's eyes are gravure printing products. However, in Western Europe, flexographic printing accounts for more than 70% of plastic food packaging, and gravure food packaging bags are still decreasing. According to the current development trend of gravure printing in China, we have reason to believe that gravure printing will continue to maintain its absolute leading position in plastic flexible packaging printing. Of course, plastic flexible packaging ink must develop in the direction of safety and sanitation. With China's accession to the WTO, the requirements of packaging will gradually be in line with international standards, and the country will gradually formulate more stringent standards. Manufacturers that provide raw materials for flexible packaging enterprises must take precautions, adjust their technical direction, and adapt to the development needs of the times in order to remain invincible in the market

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