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force data about each comparative example shown in Table 1, a regression equation of Equation 1 below may be obtained. Equation 1 may approximate the relationship between the cutting force of the shaving blade and the thickness distribution of the cutting edge. 

5 

10 

[0050] The data about the multiple comparative examples shown in Table 1 were derived using an actually fabricated specimen, and some of the comparative examples are used in actual razor products. In this aspect, Equation 1 has high reliability, and the result obtained through Equation 1, which will be described later, may also have high reliability. 

[0051] When the correlation between the thickness in each section of the cutting edge and the cutting force of the cutting edge is obtained using Equation 1, the results in Table 2 below may be obtained. 

15 

20 

[0052] The correlation in Table 2 is a numerical representation of the degree of correlation between the change in thickness and the change in cutting force in each section. Therefore, when the correlation of a certain thickness section is low, the degree of change of the cutting force may be relatively small compared to the thickness of another section having a higher correlation even if the thickness of the section changes. 

25 

[0053] For example, in Table 2, the correlation of T16 is 0.974, which is greater than the correlation of T4, 0.682. Accordingly, the reduction in thickness required to reduce the same cutting force may be smaller at T16 than T4. That is, when the thickness of the shaving blade reduced at T16 and the thickness of the shaving blade reduced at T4 are the same, the effect of reducing the cutting force that may be obtained at T16 is greater than the reduction effect that may be obtained at T4. 

30 

[0054] Referring to Table 2, the highest correlation is obtained at T16, and the correlation decreases in order of T32, T64, and T100, which are thicknesses of D16 or higher sections away from the substrate tip. At thicknesses T4 and T8 at less than D16 close to the substrate tip 12, the correlation is lower than at the other thicknesses. 

35 

[0055] To reduce cutting force, conventional shaving blades have been focused on reducing an area of the cutting edge that is very close to the substrate tip. It is found from the experimental data above that the highest correlation is obtained at D16, which is relatively spaced apart from the substrate tip, and a relatively high correlation is obtained in areas beyond D16. 

[0056] Accordingly, research has been conducted on the thickness ofthe sectionsat D16 or afarther distance.Details of a shaving blade according to an embodiment of the present disclosure, derived on the basis of this research, are described below. 

40 

Equation 1 

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<img src='content_image/878284.jpg'>

[0057] In the substrate 10 according to one embodiment of the present disclosure, the thickness of the substrate 10 according to the distance from the substrate tip 12 may be in the range disclosed in Table 3 below. 

45 

50 

[0058] Referring to Table 3,the thickness T16 of the substrate 10 measured at distance D16,which is 16 micrometers from the substrate tip 12 may be from 2.41 micrometers to 3.76 micrometers, preferably from 3.08 micrometers to 3.76 micrometers. 

55 

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[0059] The thickness T32 of the substrate 10 measured at a distance D32, which is 32 micrometers from the substrate 

