Basic requirements of film coating on chip core
film coating has higher requirements on chip core, which has several significant differences compared with sugar coating. The hardness and brittleness of chip core and whether the surface of chip core is flat and smooth are the most critical prerequisites for obtaining ideal coating effect
1. The core must be smooth, flat and uniform. The smooth and uniform core is the basic guarantee for the good appearance of film coating. Only the smooth and uniform core can ensure the appearance effect of core coating
2. Hardness: film coating requires the core hardness to be higher than 3kg/cm, which can minimize the energy input. This has not been reported in the previous ceramic and ceramic matrix composite structure. 3. The hardness of traditional Chinese medicine tablets is best around 5kg/cm 3, and that of Western medicine tablets is best around 4kg/cm 3. (note that 3kg/cm3 is the minimum, and the coating effect of cores lower than 3kg/cm3 is poor.) the better the core hardness is, the better the coating effect is
3. Brittleness: also known as wear resistance, the brittleness of the chip core is required to be less than 0.3%, that is, the more wear-resistant the chip core is, the better. Because when the wear resistance of the chip core is poor, even if the chip core is flat and the hardness is OK, the coating appearance effect will be caused by the wear during the coating process, and it is more impossible to stretch the tool into the mixer to pick up the poor material (such as edge gouging, pitting, etc.) during operation. Therefore, this index is the most critical and easily ignored condition that affects the appearance. Please be sure to note that the higher the wear resistance, the better
4. Core color: also known as the background color. The background color of the core of the 5-Pillar guard plate directly affects the brightness of the colored clothes. Generally speaking, the core with darker background color should choose the color with stronger hiding power. Among all colors, yellow (especially lemon yellow) has the weakest hiding power
source: Wuzhou Jiajin corona coating materials Co., Ltd.