EP 3 800 016 A1 [0028] The thickness of the cutting edge 11 disclosed in Table 1 was measured using scanning-electron microscopy (SEM). However, the present disclosure is not limited thereto. The thickness of the cutting edge 11 may be measured using an interferometer or confocal microscopy. [0029] Referring to Table 1, the shaving blade of each comparative example may have different thicknesses in the respective sections ofthecutting edge.Accordingly,theshaving blades ofthe comparative examples may have different cutting forces. [0030] Forexample,the cutting edge 11 oftheshaving blade according to the Example has a relativelysmallthickness compared to the comparative examples, and in particular, in areas of D16 or higher. [0031] Further,referring to Table 1, the cutting edge 11 of the shaving blade according to the Example has a relatively low cutting force compared to the comparative examples. [0032] FIG. 2 is a graph depicting the magnitude of shaving resistance with a cutting distance of a shaving blade according to Comparative Example 1 of Table 1 and a shaving blade according to an embodiment of the present disclosure. [0033] In this specification, the cutting distance refers to the distance that the cutting edge travels from the time when the cutting edge contacts the body hair until the hair is completely cut off by the cutting edge. [0034] In this specification, shaving resistance refers to the force acting on the shaving blade by body hair during shaving. [0035] Referring to FIG. 2,in the section ofcutting distance from 100 to 500 micrometers ( m m), the shaving resistance is 1.0 gf or less, and may have a relatively small magnitude. [0036] In this section, the shaving blade may start contacting the body hair. When the shaving blade moves, the body hair in contact with the shaving blade may lie down in the movement direction. In this state, when the shaving blade moves a certain distance, the body hair may be pressed by the shaving blade, and thus, a part of the shaving blade may cut in the surface of the body hair. [0037] In this section, tension does not occur inside the body hair, and accordingly, the magnitude of the shaving resistance may have a relatively small value. [0038] In the section of a cutting distance from 500 to 800 micrometers ( m m), the shaving resistance may continue to increase to the highest point. [0039] In this section, the body hair may almost lie down in the movement direction of the shaving blade, with the shaving blade cutting in the body hair. In this case, the body hair may no longer be laid down, and accordingly, tension may occur inside the body hair due to tugging of the shaving blade. [0040] At this time, the shaving blade cutting in the body hair may dig deeper into the body hair, whereby substantial cutting of the body hair may start. [0041] In this section, as the cutting distance increases, the magnitude of the tension acting on the body hair may continue to increase, and accordingly the shaving resistance may also increase. This increase in shaving resistance may be continued until the cutting of the body hair by the shaving blade is completed. [0042] In the section of cutting distance near 800 micrometers ( m m), the shaving resistance may reach the highest point and may decrease rapidly after reaching the highest point. [0043] In this section, cutting of the body hair by the shaving blade may be completed. In this case, tugging of the body hair by the shaving blade does not occur, and accordingly the tension acting on the body hair may disappear. Accordingly, the shaving resistance may be drastically reduced. [0044] Thehighestpointofthe shaving resistance meansthe minimumforcerequiredforthe shaving bladetocomplete cutting of body hair. Accordingly, the shaving resistance at the highest point may represent the cutting force of the shaving blade. [0045] For example, the cutting force of the shaving blade of Comparative Example 1 is 5.90 gf, and the cutting force of the shaving blade according to the embodiment is 4.30 gf. It may be seen that the cutting force of the shaving blade according to the embodiment is about 27% lower than the cutting force of the shaving blade of Comparative Example 1. [0046] Referring back to Table 1, the cutting force of the shaving blade tends to decrease as the thickness of the cutting edge decreases. Accordingly, in order to reduce the cutting force, it is necessary to design a thin cutting edge. [0047] However, for the durability of the shaving blade, the cutting edge needs to have a thickness equal to or greater than a certain value. In other words, it is not possible to indefinitely reduce the thickness of the cutting edge to reduce the cutting force, and it is necessary to design a profile of the cutting edge that may reduce the cutting force of the shaving blade most efficiently in terms of reduction of the thickness of the cutting edge. [0048] The shaving blade according to an embodiment of the present disclosure has been devised in view of the above, and has a technically meaning in most effectively reducing the cutting force of the shaving blade by optimizing the thickness of a section of D16 or higher, which has a high correlation with the cutting force. Hereinafter, a process of obtaining a correlation between the cutting force ofthe shavingblade and the thicknessofthe substrate willbe described in detail. [0049] First, using the thickness distribution data about the cutting edge of each comparative example and the cutting 4 55 50 45 40 35 30 25 20 15 10 5