1. The quality of masterbatch. Since polypropylene fiber itself cannot be dyed, it is necessary to add color masterbatch to produce excellent yarn during spinning. But the color difference caused by the quality of masterbatch is not rare. The color masterbatch itself is not uniform, and the existence of continuous cutting and clumping will now cause color difference. The measure taken is to frequently check the condition of the pelletizer. The masterbatch produced is formed into slices of uniform size.

2. Temperature. The temperature of polypropylene filaments during the spinning process is also a major cause of chromatic aberration. Because polypropylene itself has a low melting point, it is necessary to ensure that the spinning temperature is higher than 60° of the solubility of polypropylene itself in the spinning process to better produce colored yarn. However, the spinning temperature is very sensitive to color. This requires the technicians of Dr. Yarn to control the spinning temperature for different colored yarns.

3. Drafting deformation. People are skeptical that "drawing deformation" will cause chromatic aberration, which is generally considered impossible. However, this is very common from the perspective of customer feedback. The measures taken are to ensure that the oil is applied at each position, the selection of the deformer and the generation of tension, all consistency, which will effectively control the color difference.

4. The influence of stretching temperature. The drawing temperature is very important. The temperature should be controlled above the glass transition temperature of 10°-20°C. Too high temperature will dissolve and cause the thread to break. Too low temperature will also cause the filament end to be unsatisfactory and uneven color. Studies have certified that the best stretching temperature is 130°.