Cosmetic gels consist of gelled liquids which are produced with suitable swelling agents. Basically, gels are single-phase systems which, depending on the basic liquid, water or oil, belong either to the hydrogels or oleogels.
In the industrial production of gels for cosmetics, many constituents can be used that are intended to develop their optimal effect in the finished product. For this purpose, the polyacrylic acid Carbopol is often used as a versatile thickener, because it can thicken a wide range of solvents and even nonpolar systems. Carbopol also enables a well-controlled application during the production phase. However, numerous factors must be taken into account during the mixing process, in order to guarantee GMP-compliant and efficient production. Furthermore, the integration of Carbopol in powder form requires a multi-stage mixing procedure, observance of certain rotary speeds and avoidance of air intake into the product. Cosmetic gels can be produced efficiently by this method of processing.
Especially for these particular features, the homogenisation plants should have the possibility of convenient suction and dispersion of powders. When adding powders to the liquid phase of the product, a low rotational speed must be maintained to prevent the incorporation of air. The process plant should therefore have an infinitely variable adjustment of the agitator and the homogeniser, as well as be specially designed for suction in the lower speed range. In this way, highly efficient agitation and homogenisation can even be carried out at low rotational speeds.
The suction is generally vacuum-controlled for additional liquids or powders (in this case Carbopol) in the circulatory flow of the vessel. This method ensures rapid incorporation of powders and can prevent the incorporation of air by means of vacuum or overpressure. Pressure and vacuum-proof machine designs thus also provide added support for the production process.