The quality of the most popular plastic flexible p

2022-07-30
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The quality of printing inks for plastic flexible packaging has been generally improved in recent years, the quality of domestic inks has been generally improved, and the gap with foreign products is becoming smaller and smaller, but the low-cost inks produced by many domestic ink manufacturers are not standardized

the printing speed of foreign printing machines is fast, the production environment is relatively standard, the varieties are in large batches and the color is specific, so the ink requires high solid content, low viscosity, bright color and strong coloring power. In China, medium and low-speed printing machines are mainly used, and the domestic printing machines are uneven, the performance is too large, the product batch is small, there are many varieties, the production environment is poor, the operation is not standardized, and the price competition is fierce. This requires ink adaptability, good liquidity and low price

gravure printing inks currently used in China contain a large amount of organic solvents (about 50%). Gravure printing ink is usually made of chlorinated polymer. In the process of ink production, chlorinated polymers need to be dissolved in strong solvents (such as aromatic solvents such as toluene), and toluene is used to adjust the viscosity of ink in the printing process. However, toluene, ethyl acetate, butanone and other solvents have low boiling points, high volatility and contain aromatic hydrocarbons, which are toxic and flammable, and are the main pollution sources of the environment. The chlorofluorocarbon gas volatilized from the production of chlorinated polymer inks will destroy the ozone layer of the atmosphere. In the process of ink production and printing, the use of aromatic solvents (toluene) will also endanger the health and safety of workers (fire risk)

the sample is returned to the starting position for the second time. In addition, benzene is very easy to remain in the dry ink film of plastic flexible packaging printing products (xylene is required to adjust the drying speed of the ink for low-speed printing, but xylene is more likely to remain). Benzene residue will pollute the food or articles in the packaging. Therefore, the ink industry has been working hard to develop alcohol soluble inks that cause less environmental pollution. Let's take a look. 1. Alcohol soluble 2. Pressure testing machine inks can solve the problems of benzene damage and benzene residue caused by toluene inks

in Japan, South Korea, Southeast Asia and other countries, toluene inks have been eliminated, and flexible (relief) printing is also strongly advocated in Europe. But gravure printing can only use alcohol soluble ink, so alcohol soluble ink instead of benzene soluble ink is the inevitable trend of the development of plastic flexible packaging printing ink in China

however, benzene free and ketone free inks still pollute the environment and have solvent residues. Therefore, water-based gravure printing ink as a substitute system for solvent ink has attracted the attention of many departments, but the oil ink in plastic film printing has not yet reached the real practical stage. On the whole, the water-based gravure printing ink has not been further popularized because the printing performance and quality still can not meet the standards of solvent based ink printing

due to the large surface tension of water, it is difficult to wet the ink; The water does not volatilize, and the printing speed cannot go up. If we want to obtain the printing speed and printing quality of solvent based ink, not only the water-based ink itself needs to be improved, but also the gravure printing equipment and the printing plate roller need to be improved. For example, when the corrosive or electric engraving roller is changed to the laser plate making roller, the printing roller also needs to be made of corrosion-resistant materials. It also needs to refit more powerful and effective ink drying system, ink scraper and other equipment components on the printing machine, which requires considerable investment and a long time. Therefore, water-based gravure ink can not replace solvent ink except printing on paper

how to use a single solvent (convenient for recycling), surface printing, internal printing, compounding and cooking; All kinds of plastic films are suitable for any climate (which can reduce the production cost of enterprises). High speed, medium speed and low speed gravure printing inks are suitable for low prices. In a broad sense, gravure printing inks are the hope of the domestic gravure printing industry

this year, Zhejiang fangbang Machinery Co., Ltd. and Xi'an Aerospace Huayang Co., Ltd. exhibited satellite type high-speed relief (flexo) printing machines at the Shanghai full printing exhibition of transparent, halogen-free, phthalate free, non-toxic, easy to process, flexible thermoplastic elastomer (TPE) particles. Baoding yisida, Dalian and other plastic printing enterprises also introduced foreign advanced high-speed relief (flexo) printing machines to meet the packaging needs of China's dairy industry, It has solved the pollution and residue of benzene solvent to the environment, and has become a new competitive highlight of plastic flexible packaging printing. Therefore, the development and production of relief (flexo) ink with low price and excellent performance has also become the goal of ink manufacturers

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