Rotary blade for slotter, production manner of slotter and sheet body for cardboard box

摘要

PROBLEM TO BE SOLVED: To provide a rotary blade for a slotter capable of forming a cut groove formed in a conventional corrugated box, and further, capable of forming a cut groove of a corrugated box excellent in tightness and hard to generate a gap in corners thereof when the corrugated box is assembled.SOLUTION: The rotary blade 1 for the slotter includes: a rotary blade body 10 having a cut groove forming part 20 formed along a nearly circular shape; and a movable blade 50 fitted to the rotary blade body. The movable blade is provided so as to fix a cutting part 55 thereof by selecting a cutting position, which continues to a cut groove formed part along an extension curve of the cut groove formed part, and a non-cutting position inside of the cutting position. A cutting width of the cutting part of the movable blade is provided narrower than the cutting width of the cut groove formed part. The cut grooves of the corrugated box hard to generate a gap in corners thereof can be formed by positioning the cutting part of the movable blade to the cutting position, and the cut grooves of a conventional corrugated box can be formed by positioning the cutting part of the movable blade to the non-cutting position.