Presto has recently introduced a crease stiffness HMI tester to test the crease resistance and board stiffness of various products like carton board, paper, printing, and packaging materials. The board stiffness and crease recovery are critical in the performance of cartons, especially on high-speed packaging machines and manual folding. The value of crease stiffness is technically important in the folding of carton blanks, most importantly during the release and closure.