Four Misunderstandings In The Use Of Ink

Misunderstanding 1: completely replace the ink blending oil with a detackifier

In the production process, when printing large-area solid plates, the ink is not easy to be evened during the transfer process of the ink roller, or the paper "fluffs" or the printed product is rough, it is generally caused by the high viscosity of the ink.

Detackifier and varnish can reduce the viscosity of ink, but their properties are not exactly the same. While reducing the viscosity of the ink, the detackifier also has the effect of inhibiting the drying of the ink and reducing the adhesion of the ink layer to the paper. In the ink, the varnish can 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 very obvious. If an excessive amount of detackifier is added to the ink to reduce the viscosity of the ink, it is likely to cause the phenomenon of "not drying" or "chalking" of the ink layer. So pay attention to the "quantity" problem when adding detackifiers, and never take it lightly. Keep it in an appropriate ratio and increase the amount of desiccant at the same time to avoid the above-mentioned adverse consequences. 

Misunderstanding 2: Use white ink as a dilution agent

Individual color inks need to add a diluent to the original ink to make it a light-colored ink. This diluent should be colorless and transparent. Brightening paste and Weili oil are both ideal dispersants, which have the function of not changing the hue of the original ink but can change the depth of the original ink. If white ink is used as a diluent, it is inappropriate, because white ink has a white hue, it will change the hue of the original ink and make the original ink tend to be white and tender jade ink instead of light-colored ink. This goes against the operator's original intention of needing light-colored ink. Moreover, in the offset printing process, if there are too many white ink components in the ink, due to the high proportion of white ink pigment particles, the pigment particles will pile up on the printing plate or blanket during the ink delivery process, which will cause the disadvantage of rough printing.

Misunderstanding 3: Does not distinguish the different functions of anti-sticking agent and de-sticking agent

The anti-sticking agent is added to the ink to prevent or reduce the sticking problem of the paper surface and back after printing. The detackifier reduces the viscosity of the ink, and it mainly plays its role in the process of ink transfer during printing. If the two are confused without distinction, other problems are likely to arise.

If a detackifier is added to the ink in order to prevent the ink on the front and back of the paper from sticking, the "non-drying" nature of the detackifier will prolong the drying time of the ink layer of the printed product, which will counterproductively make the paper surface more sticky and dirty.

on the other hand. If more anti-sticking agent is added in order to reduce the viscosity of the ink in the printing process, it will not only not play a good role in reducing the viscosity, but will also "roughen" the ink and lose its luster and affect the quality of the product.

Misunderstanding 4: Not paying attention to the difference between red dry oil and white dry oil

Although both red dry oil and white dry oil are desiccants of the ink, their respective components have different compositions, so that the dry form of the ink layer is different.

Adding red dry oil to the ink can greatly increase the speed of oxidation and conjunctivation on the surface of the ink layer, that is, rapid drying on the surface of the ink layer, but the red dry oil cannot promote a greater increase in the drying speed inside the ink layer. White oil has the property of promoting the overall drying of the ink layer. When the white dry oil is added to the ink, the drying speed on the surface and inside of the ink layer can be greatly improved. Therefore, when we use desiccant, we must pay attention to the difference between the two dry forms. For example: for the dry surface of the ink layer. Red dry oil is better than white dry oil.

However, if the solid printing plate or paper with a thicker ink layer has poor drying performance on the ink layer due to its pH, if the operator simply uses red dry oil as the ink oil desiccant, the ink layer is likely to appear The surface is dry but the inside is not completely dry. Such a printed product can easily wipe off the ink layer in the case of rubbing with an external force, leaving the printed product with traces of being rubbed, which affects the product quality.

In addition, when you need to add a desiccant when printing gold ink and silver ink, generally red dry oil should be used instead of white dry oil. Because white dry oil is combined with gold ink and silver ink, it has a tendency to make the original ink color tend to be dark, so the printed product will affect the gloss effect of gold and silver ink.