Printability and application of the hottest ink cl

2022-08-08
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Printing suitability and application of ink cleaner (Part 1)

printing auxiliary equipment refers to a part of printing equipment with small amount in printing, but has a great impact on printing quality and stability, such as printing cots, rubber blanket, fountain solution and ink cleaner. This article will focus on the printability and application of ink cleaner

generally, printing machine manufacturers will strictly test the chemicals used on their machines, and also have strict regulations on ink cleaners. For example, Heidelberg printing press has been strictly tested, and it is stipulated that there are three kinds of car washing water that can be used on Heidelberg printing press: bottcherin 60, superdot and Varn. It can be seen that printing machine manufacturers attach importance to ink cleaners, and these will be detailed in the engineering manual of the printing machine

ordinary offset presses use water supply and ink supply devices to supply printing plate fountain solution and ink. Although the ink and fountain solution do not dissolve each other, when the offset press presses, the water and ink are sheared at high speed in the roller gap and forced to mix and emulsify. Therefore, the ink supplied by the inking system of offset press to the printing plate is emulsified ink containing a certain amount of fountain solution

offset printing ink is an organic substance according to its molecular structure, which can be dissolved by organic solvents, while the pigment in the ink is neither soluble in water nor organic solvents, and only has a certain affinity for water. The fountain solution is composed of water, inorganic compounds and Arabic gum, and its hydrophilicity is very good. It can be seen from this that the components of the ink cleaner need to contain both organic solvents and components with good affinity with inorganic compounds and pigments, so as to form an emulsion of "oil in water, oil in water" by using the emulsification principle in the process of cleaning the ink according to the chemical principle of "structural similarity and compatibility", so as to achieve the purpose of cleaning the ink on the ink roller, blanket and printing plate

gasoline was first used to clean the ink on offset presses. However, gasoline and kerosene can only dissolve the organic substances in the ink, but cannot dissolve the inorganic compounds in the fountain solution in the emulsified ink. They have poor compatibility with the ink pigment and the paper wool and paper powder attached to the ink roller. Over time, the surface of the cot will be glazed, the surface will be seriously damaged, the ink transfer ability of the ink roller will decline, and the size will change, which will seriously affect the printing pressure, resulting in printing failures such as "ink bar" and "flat hair" during printing. Moreover, it causes serious environmental pollution and great harm to human body, which is also the hidden danger of fire, "Galen said, so this detergent has been on the edge of being eliminated

at present, many domestic printing enterprises only consider the immediate absolute cost and still use gasoline or kerosene to clean the ink. This process has significantly affected the social and production benefits of the printing industry and must be changed. In addition, in terms of cot maintenance, at present, many manufacturers are doing market promotion work in this area. Now many printing plants, especially in coastal areas, have paid more and more attention to the important role of maintenance on printing efficiency. Therefore, high-quality ink cleaners have broad development space

cleaning principle of ink cleaner

with the increasing requirements for printing quality, ink cleaner, which is easily ignored as a printing auxiliary equipment, has a greater and greater impact on printing. Many quality problems in printing often come directly or indirectly from ink cleaners. For example, the performance of the cots with water or ink is low, the cots are deformed, the field density is insufficient, flat hair, etc., most of which are caused by the improper use of detergent, which affects the printing quality and increases the printing downtime

in the process of cleaning the ink, use the emulsification principle, and use high-quality ink cleaner and water for cleaning. Detergent can dissolve oil soluble substances, while water can dissolve water-soluble substances, forming the form of "oil in water" and "water in oil" to complete the cleaning of impurities on the surface of printing cots, and can clean most oil-soluble and water-soluble substances. However, it is impossible to completely remove the impurities on the surface of the cot every time. There will always be some impurities left on the surface of the cot, and this will be distinguished according to the nature of the ink. If gold and silver and other spot color inks are printed, the cleaning work will be more difficult

insoluble substances cannot be removed with general ink cleaners, and some special maintenance chemicals need to be used for auxiliary cleaning. Zhongwang can provide a series of services from car shape design, material structure design, aluminum body production line design, simulation analysis, sample car production and so on

composition of ink cleaner ink cleaning must comprehensively consider energy efficiency, environmental protection and product quality composition of agent

ink cleaner is mainly composed of the following parts:

1 Hydrocarbons

in detergents, the content of hydrocarbons is about more than 50%, and hydrocarbons are divided into aliphatic hydrocarbons, lighter compounds and aromatic hydrocarbons according to different molecular structures. They have the following characteristics:

(1) aliphatic hydrocarbons: the chain structure of carbon molecules in the molecules, which has a good dissolution effect on ink, can not be dissolved in water, and can not be dissolved in rubber There is no harm to human body and environment

(2) aromatic hydrocarbons: the ring chain structure containing carbon molecules in the molecule has a good dissolution effect on the ink, but it will cause the expansion of rubber polymer, and have adverse effects on the human nervous system. Long term use may lead to cancer

2. Emulsifier

ink cleaner must contain emulsifier, which has the following characteristics: promote the mixing of oil and water to produce emulsification; Generally, the detergent with flash point contains emulsifier; It will not cause residual chemicals on the cots and blanket

3. Corrosion inhibitor

since detergent needs to be cleaned with water, corrosion inhibitor can prevent water corrosion

a high-quality ink cleaner is generally composed of two organic solvents with different boiling points, rubber antioxidant and surfactant that can form a stable water in oil emulsion

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