Wedge knife based ruled-die cutting is widely spread in many fields such as foods, stationery packaging . Creasing is one of most important mechanical behavior for making any hinges on a product pattern of carton box. But since the deformability of paperboard is different from isotropical elasto-plasticity such as ductile metals and the deformation characteristics of crease folding are complicated, the creasing work is almost based on empirical knowledge of experts. A few reports for any suitable or critical conditions of the fine work are known. In this study, in order to reveal the usefulness of tapered groove, the authors experimentally investigated the effects of 45 degree tapered groove on the eccentricity of crease bulging and compared them with that of normal case (0 degree tapered).
As a result, when observing the state of the shape after the ruled line processing, it became asymmetric when the lateral shift became large, but it was improved when using the tapered groove. Also, in order to check the influence of lateral shift during bending, 180° bending was performed and the ruled line processing position was observed. As a result, the ruled line machining position changed as the lateral deviation increased, but the change using the tapered groove was small. In this study, it was found that the influence of lateral shift during ruled line processing becomes pronounced at a certain place and that using tapered groove can improve.
