Machine-kneaded soap - Machine-kneaded soap

…The former is called framed soap, which is difficult for water to penetrate and does not dissolve in cold water, but dissolves easily in hot water, making it suitable for bath soap. The latter is called machine-kneaded soap, which has fine soap crystals, is easy for water to penetrate, and dissolves well in cold water. In the case of cosmetic soap, it is particularly important to carefully consider free alkali and impurities that may irritate the skin.

*Some of the terminology that refers to "machine-kneaded soap" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…前者は枠練りセッケンと呼ばれ，内部に水が入り込みにくく，冷水には溶けにくいが，湯には溶けやすく，浴用セッケンに適する。後者は機械練りセッケンと呼ばれ，セッケンの結晶が細かく，水分が入り込みやすく，冷水によく溶ける。化粧セッケンの場合は，とくに遊離アルカリ，皮膚を刺激する介在不純物などを十分に吟味する必要がある。…

※「機械練りセッケン」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報