The Sourcing Agent Treated Fabrics Whiteness Test
There are many methods with various reliability and using range to measure whiteness. Especially in recent years, with the extensive use of fluorescent optical whitener , the determination of whiteness becomes more complicated. The testing of whiteness can generally be divided into two categories: one is to test the reflectance of each wavelength by the spectrophotometric detector and calculate the L value, a value and b value using a computer, and then get the whiteness value by the whiteness formulas. At present, there are many formulas for calculating whiteness, but there are some defects existing. It is difficult to find a formula for calculating whiteness exactly in accordance with the actual situation. Another type of measurement is using the whiteness meter, which is usually express the whiteness value by reflectance at a specific wavelength. Take type ZBD whiteness meter as an example, if the specific wavelength light is measured by making it through the filter and the wav...