What are the steps of plastic color matching?

An experienced colorist must know the colorant he needs before mixing colors. To master the general rules of mixed coloring of colorants, we should also have a clear understanding of the properties of colorants used, such as hue, shade, fluidity, heat resistance, weather resistance and chemical stability. , accumulate representative plastic coloring samples and color matching. Before finding a suitable colorant formula, a lot of experiments must be carried out, and the same color must be blended repeatedly until the desired color is obtained. Obviously, visual color matching is a trial and error method, which is not very scientific. Because this method is simple and practical, it is still widely used. But this method is time-consuming and requires the operator to have rich experience, otherwise it is difficult to operate.

2, instrument color matching

Instrument color matching is based on visual color matching. This method uses measuring instruments such as spectrophotometer to replace the functions of human eyes and brain. The trial and error process of color ratio is carried out by computer simulation, and there is no actual mixing of plastics. The operator only needs to measure the reflectivity, that is, its standard value, and choose pigments for color matching. By adjusting the concentration of color pigment, the measuring system is consistent with the standard conversion value. If the pigment selected by the operator is reasonable, the system will output a formula in the form of mass fraction, and then convert the percentage formula into mass ratio.