The importance of ink fine-tuning in printing
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In the offset printing process, it is often necessary to adjust the ink used. To adapt to the printing needs of different products and different papers. The ink is suitably adjusted. This is achieved by adding appropriate auxiliary materials to the ink. Because people have different understandings or prejudice about the auxiliary materials, therefore. In actual production, it is very likely to enter certain "misunderstandings", resulting in unsatisfactory results.
First, completely replace the varnish with a debonding agent
during production. When printing large areas of the field version. The ink is not easily beaten during the transfer process of the ink roller or when the paper is "hair loss" and the print is rough. Generally, the viscosity of the ink is too high.
The main component of the debonding agent is: aluminum stearate, which is a kind of wax. Its role in the ink is to reduce the cohesion of the ink. The main component of the varnish (we mainly use No. 6 oil) is dry. Vegetable oil, its main role is to improve the fluidity of the ink and reduce the viscosity of the ink. Detackants and varnishes can reduce the viscosity of the ink, but their properties are not exactly the same. The detackifying agent also has the effect of suppressing the drying of the ink and the property of lowering the adhesion of the ink layer to the paper while reducing the viscosity of the ink. The varnish is used in the ink to reduce the viscosity of the ink and increase the fluidity of the ink. Although it has an effect on the drying speed of the ink layer, it is not obvious. If an excessive amount of detacking agent is added to the ink to reduce the viscosity of the ink, it is easy to cause excessive emulsification of the ink, resulting in a phenomenon that the imprint is not dry or weak, flying ink, etc., and the effect on post-processing such as buffing and laminating is extremely serious. Therefore, do not use it as much as possible. If you need to use the available 6# varnish, and pay attention to the addition amount, do not exceed 3%, and at the same time increase the amount of desiccant.