Keio University

Nissan Motor Company Limited

Kouichi Asakura

Akihiro Kuroda

Hiroyuki Mitomo

Tatsuki Kurata

Shirou Ota

Shou Sakai

Kazuyuki Shizawa

Hideo Sugawara

An object is to measure absorbance of aqueous cosmetic materials that have not heretofore been studied for absorbance measurement, and particularly to form a uniform layer of thin film in order to ensure accurate measurement without causing these aqueous cosmetic materials, which are O/W emulsions, to undergo phase separation during measurement. As a means for achieving the foregoing, an absorbance measurement method is provided, wherein an absorbent aqueous composition is applied on the surface of a substrate, which surface has been plasma treated, arc-discharge treated, or corona-discharge treated, to achieve a contact angle with pure water of 0 to 70.0 degrees, and the applied absorbent aqueous composition is measured for absorbance.

Method and device for measuring absorbance of aqueous compositions using a substrate having a surface with an adjusted contact angle with water

A bell cup includes an inner surface and a coating material diffusion surface on the inner surface of the bell cup. The coating material diffusion surface includes a first range extending from an end part of the coating material diffusion surface to a center part of the coating material diffusion surface, the end part being disposed toward a proximal end of the bell cup, being a convex curved surface facing towards the rotation axis, and on which, in a cross section of any plane that includes the rotation axis, normal line components of a centrifugal force acting on a coating material liquid film due to rotation of the bell cup are substantially equal, and a second range extending from the center part to a distal end edge of the bell cup, and being a being a concave curved surface facing towards the rotation axis.

Bell cup for a rotary atomizing type electrostatic coating device

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Yokohama, Japan

Kouichi Asakura