Tactile and Physical Properties of Cosmetic Powders with a Shittori Feel

Abstract

Shittori feel is defined as a texture that is moderately moisturized and is one of the most favorable textures for many Japanese. In this research, we studied the relationship between the tactile and physical properties of cosmetic powders to determine the specific factors that make up shittori feel. We selected nine cosmetic powders with different sizes, shapes, and touch to conduct physical and tactile evaluations. These evaluations suggested that shittori feel is a complex combination of moist and smooth feels induced by a frictional phenomenon on skin. The moist and smooth feels are perceived when the finger starts to move and when the finger rubs the powders, respectively.

Recognition Mechanism of the “<i>Sara-sara</i> Feel” of Cosmetic Powders

“…The friction force was evaluated using a sinusoidal motion friction evaluation system, in which the contact probe slide on objects under sinusoidal motion, at 25 0.5 and 50 5 relative humidity 9,11,12 . Figure 2 shows a photograph and overview of the device.…”

“…Using this evaluation system, Kikegawa et al have proposed the physical origin of the Shittori feel, a tactile sensation of moderate moisture 11 . Tsuchiya et al have found that Shit-tori is a complex combination of moist and smooth feels induced by a frictional phenomenon on the skin, i.e., when the finger starts to move and when the finger rubs a powder, respectively 12 .…”

Friction Dynamics of Wood Coated with Vegetable Oil

“…These results suggest that the surface properties of wood treated with vegetable oil are suitable to induce a smooth feel. Our previous studies showed that the smoothness of wood is enhanced when the coefficient of friction and the variation in the dynamic friction process are small and the surface has micron-order irregularities 12,13) . The frictional properties and surface morphology of wood 1 meet these requirements, suggesting that treatment with vegetable oil is a useful method for the improvement of the tactile feel of wood.…”

Nonlinear friction dynamics in the cognitive process of food textures: Thickness of polysaccharide solution

“…Previously, we revealed the tactile expression mechanism of cosmetic sponges, cosmetic powders, leathers, and cloths using this evaluation system (Asanuma, Aita, & Nonomura, 2018; Kikegawa et al, 2019; Tsuchiya, Kuhara, Kikegawa, Nagatani, & Nonomura, 2020). When the change of the friction coefficient was small, the slippery feel of sponges became strong.…”

“…The normalized delay time δ, obtained by dividing the time lag Δt by the time for a cycle T 0 , was 0.014. Previous studies suggest that δ reflects characteristic friction phenomena on soft matter surfaces(Aita et al, 2017;Asanuma et al, 2018;Kikegawa et al, 2019;Nonomura & Ouchi, 2020;Okawara et al, 2019;Shinomiya et al, 2018;Tsuchiya et al, 2020).…”