As we all know, the main body of the world ’s printing industry is offset printing. Offset ink is transferred to the substrate through ink rollers and blankets. The ink rollers and blankets are durable goods. Regular cleaning and maintenance are very important to ensure their normal work. This includes Three kinds of cleaning: routine cleaning after the end of printing every day; color-changing cleaning before ink color replacement; regular and thorough maintenance cleaning. In this way, ink cleaning is a very important project for printing companies. In addition, ink cleaning agents are very large amounts of printing consumables. According to the principle, printing companies should pay great attention to the purchase and selection of ink cleaning agents, but the current facts Yes, a large number of printing companies partially or completely use gasoline and kerosene as ink cleaning agents. A survey shows that even in Beijing, where the printing industry is more developed, few printing companies completely abolished the use of gasoline and kerosene to clean printing machines.
In fact, printing companies are well aware of the possible adverse effects of the use of gasoline and kerosene. However, gasoline and kerosene have a wide range of sources, fast drying speeds, and relatively low prices, which make printing companies unable to refuse. These advantages are particularly prominent compared with the ink cleaning agents available on the market: ink cleaning agents have specific conditions for specific printing machines, blankets, rubber rollers, etc .; the price of special ink cleaning agents is high; supply Nor can it be guaranteed to be fully timely.
Let gasoline and kerosene go to class
1. The effect is not good
Although the conventional cleaning of rubber rollers and blankets using gasoline and kerosene is very convenient and satisfactory, gasoline and kerosene are powerless to water-soluble components such as paper wool, paper powder, and gum arabic attached to the rubber roller. The accumulation of various impurities on the surface of the rubber roller will close the original capillary holes on the surface of the rubber roller to form a smooth crystalline layer, which will change the size of the rubber roller, seriously affect the printing pressure, and reduce the ink transfer performance of the ink roller. , Resulting in printing failures such as "ink bars" and "flat screen hair" during printing. At the same time, the large amount of aromatic compounds contained in gasoline and kerosene will also swell the rubber, affecting printing pressure and printing quality.
2. Security risks
Gasoline and kerosene are extremely flammable liquids. The flash point (ie, the temperature at which steam explodes when exposed to an open flame) is only 20 degrees. If the ventilation facilities in the printing plant are not good, dangerous situations such as fire accidents are likely to occur; As such, many printing companies have exploded when workers use gasoline to clean the printing press.
3. Unfavorable environmental protection
Gasoline and kerosene contain a large amount of VOC, which causes serious pollution to the environment, does not meet environmental safety standards, and is also harmful to the health of employees. At the same time, most printing companies will use the method of direct discharge to clean the ink vapor and kerosene.
Pour all into the sewer, let alone the pollution of the soil and water quality. At the same time, the gasoline floating on the water surface also has the risk of explosion in the season when the outdoor temperature is relatively high.
4. Market elimination
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