Tensile Characteristics of Connecting Portions of PaperboardSubjected to Indentation of Nicked Center Bevel Blade

Abstract

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.

Cutting Characteristic of Polycarbonate Sheet Subjected to Wedge Indentation by Knife Edge and Grooved Plate

“…Die cutting of sheet materials (work sheets) is generally processed with indentation of a center bevel blade ruled in a specified pattern [1] [2]. Where, the work sheet is transferred in a plane (horizontal) direction and mounted on a hard-flat (counter) plate in a flatbed die cutter [3]. After setting up the work sheet on the counter plate, the ruled cutting blade is reciprocally accelerated and cut off the work sheet, compared to the combination of the lower flat counter plate and the upper wedge.…”

Effects of mechanical conditions on tearing characteristics of zipper band made of white-clay-coated paperboard (Dependency of tearing characteristics on length of connecting portions, width of band and pulling direction)

“…The outof-plane shear breaking behavior of white-coated paperboard, the thickness of which was 0.47mm, was experimentally investigated and the out-of-plane shear strength was reported as the twice or triple times larger as that of in-plane tensile strength (Nagasawa et al, 2010). Also, an in-plane tensile test of a small connecting portion of a 0.47mm thickness paperboard was reported by Nagasawa et al (2008). The in-plane tensile strength of connecting portion was experimentally estimated as the same as that of plain specimen when the length of connecting portion was larger than the thickness of paperboard, although the crushed tip thickness of cutting blade affected (made weak) the tensile strength of connecting portion.…”