Before that, we wrote two articles on how to distinguish non-woven fabrics by hand feeling and visual inspection, as well as microscopic observation. Today we introduce the density gradient method
It is based on the characteristics of various fibers with different densities to identify non-woven fabrics.
(1) The system of xylene carbon tetrachloride is generally used.
(2) The precision ball method is commonly used to calibrate the density gradient tube.
(3) After being put into balance, the fiber density was measured according to the fiber suspension position.