Patent ID: 7824321

Claim:
A creasing device that forms a crease on a corrugated board sheet along a flute of a fluted inner sheet between linerboards of the corrugated board sheet, the creasing device comprising: a creasing roll having: a protruding portion corresponding to a center position of the crease and arranged on a periphery of the creasing roll in a circumferential direction; a pressing portion arranged on both sides of the protruding portion in a width direction with respect to the creasing roll, wherein the pressing portion includes a first pressing portion and a second pressing portion having different lengths in the width direction and arranged opposite to each other across the protruding portion and in an alternate manner in the circumferential direction; a body having a first attaching portion and a second attaching portion arranged opposite to each other across the protruding portion and fixed to a rotatable shaft; a first pressing piece having the first pressing portion and to be fixed to the first attaching portion; and a second pressing piece having the second pressing portion and to be fixed to the second attaching portion.