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<1>: In general, the hue, color density, and hiding power are constant, but when the amount of ink on the print is changed (such as the printing speed, the number of anilox rollers, the viscosity of the ink, and whether the blade is changed Caused by the change in the amount of ink), the effect observed on the printed matter will change, so use the ink as much as possible to control the same printing conditions; the quality of the paper will also affect the color and its hiding power.
<2>: There are many factors affecting the viscosity, especially the water-based ink, which is also related to the pH of the solution. Water-based inks have a certain thixotropy, and some color varieties even have different degrees of delamination. Therefore, it is necessary to stir well before use, or to measure and adjust the viscosity after recycling. During the printing process, the viscosity should be checked regularly and adjusted in time (especially when the temperature is high). The control of stable printing viscosities is especially important for printed dot and overlay printing.
<3>: Corrugated paper printing is generally carried out in a osmotic absorption-type natural drying method. Therefore, the drying performance of the water-based ink itself must be matched with the conditions such as printing speed and paper properties. Drying too quickly, which causes over-drying of the printing ink, is often the main cause of blocking and unclear printing.
<4>: Printing adaptability is a comprehensive concept. Ink manufacturers use a comprehensive balance for each set of ink. In order to adapt to different printing presses and different printing conditions, appropriate adjustments should also be made when using inks, as well as adjusting the status of the printing press, the properties of the sheet, and the design status of the printing plate.
<5>: The post-processing performance can also be regarded as the performance requirements, such as abrasion resistance, water resistance, and anti-deinking performance, which are related to the imprinting of the ink and the ink encountered after the printed matter left the printing press. If there are other special requirements, ink manufacturers should be asked to make a special ink formulation design. (Gong Zhangshui, Technical Department of Hanghua Ink Chemical Co., Ltd.)
What are the properties of water-based ink for carton printing?
Carton printing ink performance can be from (1) hue, concentration, hiding power of the color; (2) viscosity, thixotropy (thixotropy); (3) drying; (4) printing adaptability; (5) after Processing performance and other five aspects to describe. Briefly explain the following.