APPARATUS AND METHOD FOR SIZING TESTING

摘要

A method of measuring a Stockigt sizing degree of a paper or board is provided. The method includes: placing a paper or board, to which FeCl<SUB>3</SUB> (II) is dropped or applied, on NH<SUB>4</SUB>SCN solution; sequentially capturing, by using a camera, a process of forming reddish brown Fe(SCN)<SUB>3</SUB> wile the FeCl<SUB>3</SUB> (II) meets the NH<SUB>4</SUB>SCN solution penetrating in a thickness direction of the specimen, and recording RGB values of droplet image of the reddish brown Fe(SCN)<SUB>3</SUB>; converting the RGB values into HSV values; recording hue (H) value of the HSV values with respect to time; and checking a point where a differentiation value of the H value recorded with respect to time becomes maximum.