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The present invention relates to the field of packaging, and specifically to a method for controlling the stiffness ratio of horizontal and vertical creases. BACKGROUND OF THE INVENTION Crease stiffness is the resistance to a certain degree of folding of paperboard along the crease direction under certain conditions, and is usually expressed in millinewtons (mn). Whether it is folded by hand or mechanically, the stiffness of the crease is very important during the opening and closing process of the carton. Excessive crease stiffness will cause the folding line position in the carton forming production line or carton design to deviate from the final position. Indentation rebound will cause the carton opening force to increase or the formed carton to twist and spring. open, thereby reducing production quality and production efficiency. The transverse crease stiffness represents the stiffness of the indentation crease perpendicular to the direction of the paper fibers, and the longitudinal crease stiffness represents the stiffness of the indentation crease parallel to the direction of the paper fibers. The transverse and longitudinal...
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