Effect of Cutting Line End of Paperboard on Pushing-Load
Characteristic of Center Bevel Blade

Abstract

In this paper, we describe the three-dimensional effect of a blade line end on the pushing shear of paperboard. In order to reveal the deviation of cutting line force caused by the strain constraint of the unseparated zone, the relationship between the cutting line force and the indentation depth of a blade was experimentally investigated by varying the tip thickness of the blade, the length of the blade, and the length of the unseparated zone of paperboard. The following results were obtained. (1) The first peak (or inflection) of line force f_C1 tends to decrease in a certain range of unseparated-zone length a and a certain range of blade-tip thickness w, while f_C1 is almost constant with a in the case of a sharp blade. (2) The second peak of line force f_C2 is increased in a certain range of a. (3) A formula of the approximate relationship of f_C2 with respect to the blade length was experimentally derived.