白板紙の切断特性に及ぼす押型の影響

Abstract

In this paper, we describe a pushing shear process carried out on a white-coated paperboard. The cutting load response of a 42° center bevel blade on the paperboard was measured by varying the mechanical conditions of a rubber fixture. An early-stage deformation of the paperboard was numerically analyzed with the orthotropic elastic model, and the stress distribution in the surface layer of the paperboard was discussed with respect to the rubber fixture effect. From the experiment and numerical simulation,the following results were obtained. (1) The load of inflection point fC1 which corresponds to the surface layer breaking,decreases by 10-20% as a result of the mounting of a rubber fixture on a die set,while the load of peaked point fC2,during the final breaking,increases by 0-10% as a result of the mounting of the rubber fixture,for a specified condition of rubber fixture mounting. (2) The maximum principle stress (tensile) markedly increases at the surface layer near the blade tip as a result of considering the rubber fixture,at the early stage of blade indention into the paperboard. (3) The maximum principle stress markedly decreases in the surface layer, which is in 2-4 times the paperboard thickness from the blade tip,at the early stage.