Measurement of color and transparance of polymer chips

Study on analytical method by reflected light. I

Abstract

The color and transparence of polymer chips are usually estimated by visual inspection and methods of their quantitative measurement have not been given. Widely used JIS method (CIE method) for representing colors is inconvenient for the sensory interpretation.
The authors have presented a method of quantitative estimation of color and transparence of polymer chips by reflectometry. In the proposed method, chips of sample polymer 12 mm in diameter and 515 mm in length are placed in a sample dish with a sheet of white or black paper on its bottom, and they are irradiated vertically. The scattered light from the polymer chips was collected and its intensity was measured at 445 mμ, 555 mμ and 600 mp to obtain reflection rates. Simple calculations give the color (c) and transparenc (T) of polymer chips.
The proposed method is rapid and simple, and has an advantage in its feasibility to the quick appreciation of the result. The time required for a measurement is about 20 min., and the accuracy is satisfactorily high.