{"id":7458,"date":"2024-10-24T00:10:50","date_gmt":"2024-10-24T00:10:50","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=7458"},"modified":"2026-04-28T10:42:39","modified_gmt":"2026-04-28T10:42:39","slug":"solution-to-ink-skinning","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/solution-to-ink-skinning\/","title":{"rendered":"Qual \u00e9 a solu\u00e7\u00e3o para a perda de tinta?"},"content":{"rendered":"

What is the solution to ink skinning?<\/b><\/h1>\n

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Quick answer:<\/strong> A strong printing-ink formulation is usually the one that keeps process stability and final print quality in balance, rather than over-optimizing only one part of the press behavior.<\/p>\n

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Ink skinning is not only a problem that causes trouble in printing, but also a waste of materials to some extent, because it is difficult to dissolve the skinned ink and it is usually poured away. It is estimated that the waste is 1\u2030 in minor cases and nearly 1% in severe cases. This tangible consumption has increased a heavy economic burden on packaging and printing companies. [1]<\/p>\n

In order to prevent this phenomenon, it is necessary to understand the root cause of ink skinning in detail to avoid such failures.<\/p>\n

1<\/b><\/p>\n

Causes of ink skinning<\/b><\/p>\n

The causes of ink skinning during storage or before or during printing are oxidation, penetration, volatilization and evaporation at room temperature. This causes the surface layer of the packaging printing ink to come into contact with the air during storage or printing, and the oxidation of vegetable oil or the volatilization of organic solvents causes the ink system to polymerize and other effects, forming a gel \u2013 commonly known as the skinning of printing ink.<\/p>\n

When the concentration of the printing ink increases to a certain value, its surface will be covered with a layer of molecules. At this time, even if additional solvents or oils are added to reduce the concentration of the ink, the surface that has already formed a skin (gel) cannot accommodate any more molecules. [1] There are many reasons for the formation of ink skin, but they can be mainly classified into the following categories:<\/p>\n

1. The drying oil content in the ink is too high<\/b><\/p>\n

This kind of mistake may sometimes occur during the manufacturing or printing process of the ink. When adding the drying agent, it is important to add the right amount according to the printing conditions and ambient temperature, otherwise the ink will dry (skin) at an inappropriate time.<\/p>\n

2. Due to temperature<\/b><\/p>\n

The phenomenon of ink skin formation is mainly caused by excessively high temperatures. Under high temperature conditions, the unsaturated molecular activity in the ink is intensified, especially on the surface exposed to the air, which is prone to conjunctival oxidation in the presence of oxygen.<\/p>\n

3. Due to prolonged contact between the ink and air<\/b><\/p>\n

The binder components in the ink have redox properties. When they react with oxygen in the air, prolonged exposure to air may intensify the oxidation process, resulting in skin formation.<\/p>\n

2<\/b><\/p>\n

Ink skin solutions<\/b><\/p>\n

During the production or printing process, ink manufacturers or printing operators often take measures such as manual stirring, stirring with a polyethylene tube inserted, and adding anti-skin agents to save the skin phenomenon and minimize printing costs.The following are some measures to prevent ink skin during printing:<\/b><\/p>\n