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Abstract
Adding high-refractive index particulates is the most commonly used method in producing opaque fibers. Besides the refractive index of the added particulates, their weight percentage and particle size influence the fiber opacity too. In this paper, the films were designed and prepared from the mixture of polyester chips and titanium dioxide firstly. The effect of film thickness, size, and weight percentage of the filled titanium dioxide particulates on the reflectance and transmittance of the polyester films in the visible spectrum was studied in detail. Results showed that the reflectances of the polyester films increase with the increase of the weight percentage and diameter of the titanium dioxide within the tested range, but they have little to do with the film thickness. However, the light transmittances of the films decrease when the film thickness, weight percentage, and diameter of the titanium dioxide increase.