Low-shear handling of suspensions with an intermittent dispersing phase.
Powders in the conventional sense are known as solids. Their classic manufacturing process is called Powder Compaction: Dry powders are compacted with a pounder to form a solid unit (a disc or other form). Finished products are i.e. eye shadow or blush.
However, in some manufacturing processes these powders are formulated in a liquid phase. This often results in complex fluid characteristics. The behavior is sometimes rheopex, i.e. shear-thickening over a period of time. Shear causes the solid component to compress, the liquid is extracted, and the product can therefore no longer be dosed. The solution: These rheopex fluids or liquid powders can be dosed using a low-shear dosing method. The ViscoTec endless piston principle is particularly advantageous for this application. It allows continuous and low-pulsation dosing and filling.
Processing of liquid powders
After the actual dosing process, the intermittent dispersing phase is evaporated – the suspended solids form a solid structure. In this way, color gradients can be achieved in addition to shapes, such as lettering or patterns. Different products can also be combined.
The ViscoDuo VM HD, a 2-component Hygienic Dispenser, is used to combine different products. The mixing ratio of two material components can thus be flexibly adjusted.
On our pharmaceutical application site you can find other dosing examples in hygienic processes.