HT Fine Textile Chemical Auxiliary Agent

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...

1. Common methods Correct the horizontal position of capillary effect tester, adjust acaleplate and makes, its zero points exactly in one level with the water level. And then take 2 samples with 30cm in length and 5cm in width, make the mark at 1cm place to one end of cloth with a pencil mark, and then fix a 2g glass rod at the end of in the latitudinal direction as a weight,grip the other end of the clamp in the instrument's iron clamp, drop the end of glass rod into the water, stop at the 1cm level mark, start to time for 30min, observe the distilled water wetting cloth height. If it is uneven, read the minimum. Take the average of two data. 2. Express methods Cutting the cloth with 2cm in width and 10cm in length. Test according to the above sample method,  Watch the time need for distilled water rise 2cm height, if it is uneven, take the minimum value.  3. Drop method Keep the sample cloth in the tight frame taut, load the distilled water in the burette, and then put the ...