Abstract: A die-cutting blade can form smooth die-cut lines in case-forming blanks which are less likely to injure hands when touched. A strip-plate-shaped steel blade plate has a pair of chamfers formed on opposite side surfaces of the blade plate, respectively, so as to extend from one side edge of the blade plate at substantially equal inclination angles. The chamfers define a cutting edge along the one side edge. The cutting edge has a composite wave pattern formed from a small wave pattern bent to have a wave shape within the range of the thickness of the blade plate, and a large wave pattern formed by a large undulation in the small wavy edge toward opposite side surfaces of the blade plate over its entire length within the range of the thickness of the blade plate, in order to provide smooth die-cut lines.

Abstract: A waste removing apparatus is used in a punching machine for manufacturing a carton and removes a waste region of a sheet inserted between a movable die and a fixed die by cutting the sheet along a punching line formed thereon. Two molded plates are provided on the movable die and the fixed die, respectively so as to sandwich a product region of the sheet therebetween. The molded plates have areas slightly smaller than the area of the product region to reliably separate the waste region of a sheet from the product region thereof, even though the sheet is thin and, as such, flexible.