Angle and the shape of the cutting edge
of the Nano Powder Metal
other maker
Nano Powder Metal
The Nano Powder Metal, with blades at a 30–35° sharp cutting edge angle (image, above right), makes it easy to cut into hair. Many inexpensive or conventional haircutting scissors use blades featuring a less-sharp cutting edge angle, between 40° and 80°, with a greater curvature radius of the edge. These scissors, in addition to a worn and less-tough cutting edge (image, above left), cause the blades to become blunt.
■Haircut scissors durability test
■Source: Long-term trial report on haircutting scissors
*Scissors A and B are made from the same stainless steel as that used for high-quality knives. Source by Mr. Keisuke Kato
Cross-section of hair
other maker
Nano Powder Metal
An electron microscopic cross-section image of hair that was cut using the Nano Powder Metal reveals a very smooth cut surface (image, above right). It also shows that hair can be cut almost in a circular shape without becoming “mashed.” When cut using scissors made by another company, however, hair is mashed and cut in an oval shape. A cross-section of the hair shows a rough cut surface (image, left).
Dr. Kentaro Asakura, Engineering
Department of Materials Engineering at the School of Engineering, The University of Tokyo
(Part-time instructor at the Tobu College of Medical Technology)