Lotions are among the most frequently used cosmetic products. Cosmetic lotions are more fluid than cremes and are characterised by a higher water content. Lotions are multi-phase preparations. As they contain water, as well as fats and oils, their preparation produces finely distributed emulsions which are distinguished by hydrophobic or hydrophilic properties.
The hydrophobic lotions cannot be washed off, are water-repellant and extremely greasy. The ingredients of such a lotion, such as water, oil and wax, have different viscosity levels. A hydrophilic lotion is, on the other hand, less greasy, can be distributed well and can be washed off. It is, therefore, developed from very fine emulsions, so that the properties of the active ingredients it contains can optimally develop.
Modern homogenising mixers have special properties for use in the production of cosmetics. The process plants should be equipped with pressure and vacuum-proof vessel design, which enables the production of particularly stable and closely distributed emulsions in the shortest possible process times. In addition to a low particle size, optimum particle distribution is of paramount importance in the production of cosmetic lotions. Only in this way can the best possible development of the effect of all ingredients be achieved.
The homogenising mixers should be equipped with a scraper system which is independent of the rotation direction, in order to enable excellent radial and vertical mixing of viscose products, as well as intensive homogenisation at individually adjustable shear rates. With these properties, high-performance devices ensure the production of permanently stable emulsions with optimum particle distribution. In the production of lotions, care must be taken that, in addition to clean production, a CIP cleaning device according to current GMP standards is guaranteed. In the case of modern process plants, this is guaranteed by a rotating CIP system under the lid.