Color masterbatch quality. Because polypropylene itself can't be dyed, fine yarn can be produced by adding color masterbatch properly during spinning. However, there are many color differences caused by the quality problems of color masterbatch. The color masterbatch itself is uneven, and even has a knife block, which will lead to the current color difference. The measure taken is to check the situation of granulator frequently, so that the produced color masterbatch can form slices with uniform size.

2. temperature. The spinning temperature of polypropylene filament is also a main factor affecting the color difference. Because the melting point of polypropylene itself is not high, it is necessary to ensure that the spinning temperature is higher than 60 of the solubility of polypropylene itself in the spinning process, so as to produce colored yarns better. But the spinning temperature is very sensitive to color. This requires Dr. Sha's technicians to control the spinning temperature for colored yarns of different colors.