China currently has more than 21 billion square meters of corrugated cartons annually, which is second only to the United States and ranks second in the world. The development of the corrugated box packaging industry can reflect the development of a country's industry. It is a great pleasure to see that our national economy maintains a sustained and rapid growth. If the physical and mental health of the people improves, it will be the icing on the cake. We hope that China is "rich and strong" instead of "wealthy and weak." Therefore, the majority of packaging workers in China, especially the corrugated box printing industry, let us shoulder our due responsibilities for the "rich and strong" of the motherland.
In the past more than 20 years, flexo printing has developed rapidly in packaging printing, especially in the printing of corrugated boxes. Its printing is convenient and exquisite, which is of great help to the promotion of the product. In addition, it is recognized by the industry as the most promising printing in the corrugated box printing industry due to its unique flexibility, economic efficiency, and no pollution. the way.
At present, the printing of corrugated boxes has gradually shifted from traditional hand-carved rubber plates to photosensitive resin flexographic plates, but the vast majority of them are solid photosensitive resin flexographic plates, which have been used throughout the platemaking process and are not biodegradable. A solvent that is highly contaminated by the environment and can be easily carcinogenic - tetrachloroethylene. Many years ago, one expert said with earnest words: "We cannot take the old road of governance after the Western countries first contaminated." Today, the expert's words become the most accurate language. The rivers and mountains in Dahao were shocking and the Huaihe River, the third largest river, became a stinking ditch, and all of the billions of huge governance funds invested had gone unreliable. One medical worker can set off an unprecedented health care boom in large and medium-sized cities because the rise of China’s economy has won applause, but also faced a huge embarrassment that the national health situation is worrying. In 1998, statistics from China showed that the incidence of chronic diseases has been rising in both urban and rural areas. The top ten causes of death in some cities in China in 2002 were chronic diseases, which accounted for 90% of the deaths. However, chronic diseases can be prevented and controlled. The key lies in people's understanding. Environmental protection is just to save ourselves! ! ! For human health and the country’s prosperity, we must take action to improve and enhance the overall level of the packaging industry, and establish a comprehensive green corrugated box printing industry system, which can be improved by two methods: First, change the washing solvent to minimize the harm And install a pollution treatment system to make the printing plate completely decontaminated and detoxified before use; the second is mainly washing, biodegradable and harmless to the environment.
Shanghai Yinheng Printing Technology Co., Ltd. Liquid photosensitive resin plate is flushed with water + neutral detergent, is biodegradable and harmless to the environment, wastewater can be discharged into the urban sewage system. Currently in Europe, America, Australia, Japan and Singapore, the liquid photosensitive resin plate has developed rapidly in corrugated box printing, accounting for more than 50% of the market. It is widely used with four major advantages, namely, environmental protection, economy, good printing effect and convenience. Fast. The specific advantages of this liquid version are detailed below:
1. Field printing ink delivery
The thickness of corrugated board and the unevenness of the corrugated board are very difficult to cover on the ground during printing, and leaks often occur. Liquid plates have unexpected advantages in this regard, mainly related to the properties of the plates. The surface tension of the liquid plate is 4~5dyn/cm higher than that of the solid plate (liquid plate: 36~38dyn/cm, solid plate: 32~33dyn/cm), so the same ink roller is used. The liquid plate with the ink is 10%~20% higher than the solid plate. At the same time, the modulus of the liquid plate is lower, the flexibility during printing is larger, and the surface of the thicker surface paper or corrugated paper also has better surface contact, so the coverage effect in the field is better.
2. Platemaking economy
At present, the corrugated carton packaging market has fierce competition, raw material prices remain high, cartons production tends to be low-profit, and customers' printing requirements have grown from traditional monochrome printing to multi-color printing. The printing requirements are getting higher and higher. Although flexible printing is flexible and efficient, Most of the matching accessories prices are relatively high. Sometimes the cost of one printing plate is equal to the profit of hundreds of qualified cardboard boxes. Therefore, the carton factory must start from saving 1 square centimeters of flexographic plates to benefit itself. How can we save money?
Shanghai Yinheng Printing Technology Co., Ltd. uses the characteristics of liquid plates to develop an "island plate making method" to make printing plates for corrugated boxes. The general flexo back exposure is a full back exposure that cures to form a base layer with a certain thickness. However, the island plate making method uses partial back exposure, that is, back exposure only in areas with fonts and graphics. In this part, the subbase layer and the font graphics are formed on the bottom polyester film as islands isolated on the plate. All the uncured resin is recovered. The benefit of such platemaking is not only to greatly reduce the plate-making cost, but also that the entire plate is lighter, more conformable, and easier to mount, and not easily distorted. The island technology layout is shown in the figure below.
Island Technology Show
The liquid plate-making and drying takes only 15 minutes, while the solid plate-making and drying requires 2 hours, and the solid plate-making power consumption during the entire plate-making process is 6 times that of the liquid plate-making.
(to be continued)
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