For printing companies, printing ink cleaning is very important work. I know that most printing companies use gasoline or kerosene to clean the ink, mainly on account of gasoline, kerosene cheap source of wide, fast drying ink compared to professional cleaning agents, these advantages are obvious. However, the use of gasoline, kerosene to clean the ink still has many drawbacks.
Although the routine 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.
Security risks gasoline, kerosene, a highly flammable liquid, flash point (ie steam explosion encountered in flame temperature) is only 20 several times, if the printing room ventilation is not good, it is prone to fire accidents and other dangerous situations. As it turns out, many printing companies exploded when workers used gasoline to clean the printing press.
Adverse environmental Gasoline, kerosene contains large amounts of voc, serious environmental pollution, do not meet environmental safety standards, health workers have greater damage. At the same time, most printing companies will directly discharge the cleaned gasoline and kerosene into the sewer, and it is needless to say that they pollute the soil and water quality. At the same time, the temperature of gasoline and kerosene floating on the water is relatively high outdoors During the season, there is also the danger of explosion.
Phased out in order to better promote the development of the printing industry, the world from 1995 has already begun to develop a variety of regulations and standards for ink cleaner (car wash water), which includes: a flash point below 21 ℃ of ink cleaner It can not be used for cleaning printing rollers and blanket (such as gasoline); alkane terpenes (turpentine) shall supply and containing a halogeno group, n-hexane, imine or amine-based solvents; aromatic compound content in the solvent It should be less than 0.1%; toluene and xylene content in the solvent should be less than 10%. At the same time, many printing machine manufacturers, especially high-end printing equipment manufacturers, will strictly test and stipulate the chemical supplies used in their printing equipment. Such as Heidelberg through rigorous testing, car washing water can be prescribed for use on Heidelberg presses have three kinds: 60, superdot and varn. And some printing companies to undertake international business, we must follow through iso9001 quality management system certification and iso14001 environmental management system certification, prohibit the use of natural gasoline, kerosene as ink cleaner.
Cleaning agents currently on the market are also generally contains the following components in the composition
(1) hydrocarbon cleaning agent content of about 50% or more, in accordance with different molecular structures hydrocarbons into aromatic hydrocarbons and the aliphatic hydrocarbons types are better dissolution of the ink. Among them, aliphatic hydrocarbon molecules contain a chain structure of carbon molecules, which cannot be dissolved in water, and are not harmful to the human body, rubber rollers, and the environment; while aromatic hydrocarbon molecules contain a cyclic chain structure of carbon molecules. The human nervous system has adverse effects, and long-term use may cause cancerous lesions, swell the rubber polymer, and have a certain effect on the rubber roller. Therefore, the relevant quality standards of international ink cleaning agents stipulate that their content should be less than 0.1%.
(2) an emulsifier can promote oil-water mixture to produce emulsification; flash point generally contain detergent emulsifying agents, chemical residues without causing the rubber roller and the blanket.
(3) Since the anti-corrosive cleaning agents required for cleaning of water distribution, anti-corrosion agents has the effect of preventing corrosion of water. The ink cleaning agents in the current market are mainly divided into two parts according to the source: one is imported, and its products basically meet the relevant international quality standards, but the price is expensive; the second is domestic, its products are moderate in price, but the quality is uneven, and some products have flash points If it is too low, it is easy to cause fire. Some products have too high content of aromatic compounds and poor environmental protection. According to the type of technology, ink cleaning agents can also be divided into two types: one is a pure solvent type, which needs to be mixed with clean water, but its ratio has an optimal value, and only when this ratio is reached can the best be achieved. Cleaning effect. In actual production, machine operators often cannot control the ratio of solvent to water very well, which not only causes a lot of waste, prolongs the cleaning time, but also affects the cleaning effect; the other is that the solvent has been used before production It is mixed with water at the best ratio, and the emulsion ink cleaning agent made of emulsifier is added. Its droplet size is extremely small, which is easier to penetrate the ink layer on the surface of the rubber roller. The cleaning effect is excellent, and the amount is only equivalent to gasoline. 1/4 to 1/5. This type of car wash water is the future development direction of car wash aquatic products. Usually we are talking quality ink cleaner, is mainly refers to an emulsion ink cleaner from two different flash point organic solvent, a surfactant and rubber antioxidant capable of forming a stable water-in-oil emulsion composition which by the action of the emulsifier to emulsify the solvent into water w / o type emulsion system, the ink can be directly substituted for gasoline cleaning. The emulsion-type car wash water is not flammable and has good storage safety, but the transportation volume is large, which increases the use cost. The cleaning performance of emulsion car wash water is related to the composition of the formula, especially the choice of solvent and active agent has a greater relationship. At the same time, since the emulsion-type car wash water is a thermodynamically unstable system with poor stability, it is easier to delaminate. Once delaminated, it is difficult to deink, which affects the use, so its storage period is not too long. At present, some manufacturers have launched new ink cleaning agents, such as microemulsion car wash water, without configuration, and the thermodynamic system is stable, making up for the shortcomings of traditional ink cleaning agents.
But in general, compared with gasoline and kerosene, ink cleaning agent has the advantages of high efficiency, energy saving, environmental protection and safety, and has the role of solvent and water. It can not only remove ink, but also remove some water-soluble water such as paper wool. The amount of dirt is relatively small compared to gasoline (cleaning the same ink roller, the amount of ink cleaning agent used is only less than 50% of gasoline), the ink cleaning agent volatilizes slowly, can fully exert its effect, and can greatly save the amount, but compared to gasoline Generally speaking, the drying speed is relatively slow. Just use, when we advocate the use of ink cleaner, partly because the ink cleaner can save overall costs of printing enterprises; on the other hand is mainly intended as a socially responsible enterprise, it must be based on their actual situation environment and human health assume their social responsibilities. Therefore, even if gasoline and kerosene are abandoned and the ink cleaning agent is replaced, it does not mean that everything is available, and the ink cleaning agent is not perfect, although the ink cleaning agent has its own impact on the human body and the surrounding environment relative to steam and kerosene To be small, but it does not mean that there is no pollution; at the same time, like gasoline and kerosene, the ink and other substances dissolved in the ink cleaning agent cause harm to the human body and the surrounding environment can not be ignored.
If in the past printing companies used gasoline and kerosene to make general choices to increase profits, then in today's increasingly fierce competition in the printing industry, only gasoline and kerosene are used to clean inks, considering the current cost of materials. Practice, because it has clearly affected the social and overall economic benefits of the printing industry. Therefore, the choice of ink cleaner, not cheaper, we must look long-term, in order to obtain a large benefit on small issues!
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