抄録
Wedge indentation is well-known for producing various paperboard boxes and sizing the length of raw material sheets. In order to make the postal cardboards in a formatted size, a hundred pieces of raw cardboards are usually piled up and cut off at once by using a special side-wedge cutter. In this process, there is a problem that string-like paper dusts occurs from the sheared end of coated postcard. However, its occurrence mechanism is not revealed. To perform a high quality profile without any string-like dusts, the shearing behavior of postcards and the blade motion must be analyzed. In the present study, a cutting test of stacked 20 pieces of a coated postcard was conducted and the deformation of each layer of stacked postcards was observed using a high speed camera. It was found that the release timing of postcards compressed by the wedge tip was varied with the feed velocity of blade. Removing of clay material of coated zone was remarkably detected from the last released postcard. Namely, the edge of sheared zone is not so damaged under a stationary cutting motion without any frictional release.
