Research on the Optimization of Optical Properties of Colorants for Plastics based on Multichannel Theory

Zijian Lin; Xinyu Lin; Xiaoyin Wang

doi:10.62051/ijmsts.v3n1.08

Authors

Zijian Lin
Xinyu Lin
Xiaoyin Wang

DOI:

https://doi.org/10.62051/ijmsts.v3n1.08

Keywords:

Color matching, Plastic, Reflectance prediction, Finite difference method

Abstract

In the field of plastic color matching, the accuracy of color prediction directly affects the precise control of attributes such as hue, brightness, and saturation, thereby influencing the coloring effect of pigments. This paper conducts an in-depth study based on many-flux method and finite difference analysis, dividing the scattering medium into multiple light transmission channels according to the angle of light incidence. We investigate the flux transfer relationships between the channels to address the shortcomings of the Kubelka-Munk(K-M) theory in achieving satisfactory coloring effects in non-diffuse environments with weak scattering or thin media. Using polypropylene as the substrate, we analyze the optical properties of pigments under D65 light sources with a 10nm interval. Under conditions of higher transparency and lower scattering coefficients, we establish the relationship between the absorption coefficient K, scattering coefficient S, and reflectance R. Finally, we compare the experimental results with the reflectance errors of actual samples to optimize the theoretical model, thereby improving the coloring performance, by analyzing the K-M theory model and the multichannel model for high-concentration red pigment (DPP P.R.254) and high-concentration green pigment (Copper Phthalocyanine P.G.7).

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