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The design assignment of connecting portions on a paperboard is important in order to stabilize the transport of the paperboard during die cutting. A mechanical estimation of various deformations of connecting portions is desired to predict an allowable assignment of connecting portions. The main purpose of this study is to reveal the elongation properties of the connecting portion of a paperboard with respect to several primary parameters such as nick width and crushed blade tip thickness. The result shows that there is a lower bound width of the connecting portion; the tensile strength of the connecting portion strongly depends on the cutting direction and grain (machine) direction of the paperboard. It is also clarified that the presence of string like dust affects the tensile strength of the connecting portion and that increasing blade tip thickness reduces the tensile strength of the connecting portion.

Tool geometry plays a major role in the weld quality of friction stir welded aluminum alloys. Because of lap joint, tool geometry must be designed specifically according to the thickness of the weld specimen. Therefore, in the present work, the effect of tool geometry will be analyzed for mechanical properties of aluminum alloy 5083 weld lap joint. The result of this research shows that aluminum alloy 5083 can be joined by the friction stir welding (FSW) process, using a tapered cylindrical design pin tool with a variety of diameters (i.e 5mm ,6mm, 7mm, 8mm and 9mm) and a fix 20 mm shoulder made of H13 Steel with varying rotational speeds (910 RPM, 1280 RPM and 1700 RPM). The investigation results show the relationship between the tool geometry and the rotation speed effect on mechanical properties of the welded joint.

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