Appropriate amount of desiccant (dry oil) is added in t […]
Appropriate amount of desiccant (dry oil) is added in the aluminum foil lunch box printing ink. Appropriate addition of desiccant can achieve certain effects. The desiccant is appropriately added to the ink, and the wicking action of the ink can accelerate the oxidation and polymerization of the ink layer, promote the drying and solidification of the ink layer, and prevent the occurrence of sticky defects. However, the desiccant should not be added excessively, otherwise the object must be reversed and converted to the opposite side. It can not only achieve the purpose of improving the fixing speed and dryness, but also causes the ink to dry too fast, dry, dry, or even in the printing process. print.
In addition, it may cause an increase in the viscosity of the ink during the printing process, that is, the aluminum foil lunch box can pull with the greatest degree of adhesion due to the increased stickiness. Therefore, some people think that it is wrong to add a desiccant (dry oil) to solve the problem of sticky and dry. The application requirements of desiccant are more complicated, not only the quantity factors, the variety factors and the application technology factors, but also the various conditions such as temperature and humidity, machine speed, syrup, ink, substrate and printed matter of the workshop.
Not only the variety and dosage factors, application technology factors, but also the temperature and humidity of the workshop, machine speed, syrup, ink, substrate and printed matter and other factors. In addition, the object and function of the desiccant in the ink system is mainly dry vegetable oil, but it does not help the ink oil. Because dry vegetable oil has an oxygen-absorbing function, it can change the resin and the resin from a liquid state to a solid state during the oxygen absorption process. The function of the desiccant is to shorten the process. The ink oil does not have this function, so the desiccant does not work, especially the aluminum foil lunch box printing.
Master the stacking of printed products, because the aluminum foil lunch box printing is very easy to stick dirty, the ink layer wetted by the printed matter is more prone to such failure under the action of the paper's own gravity, so mastering the stacking volume of the printed matter is a Very important link. Generally speaking, the method of drying the splint should be adopted to minimize the pressure on the ink layer formed by the gravity of each paper, and to prevent the paper surface and the back surface from being dirty. Under normal circumstances, the stacking amount of a single piece of paper is generally about 30 sheets.The layout to maintain a minimum amount of moisture paper absorption of water is the main way of water consumption on offset printing plates, aluminum foil lunch boxes do not absorb ink at the same time it does not absorb moisture.