The functionality of Hot Melt Coating
Guidance for an excellent Hot Melt Coating
Part 2 in the series of 3 articles
In order to reduce the problems of other solvent-based coating processes, such as time and cost intensity, the active ingredient coating by means of Hot Melt Coating (HMC) was developed.
HMC is a process in which coating materials such as lipids, e.g. carnauba wax and beeswax, are melted and applied to the active ingredient by a coating machine.
In the first step the molten coating components are sprayed onto the active ingredient.
In the second step the coating components are wetted onto the active ingredient. As they have a lower melting temperature than the active ingredients, they cool down on the surface of the active ingredients and a homogeneous layer consisting of 100% coating material is formed.
In the second step, the active agent particles are conveyed into the spray area by means of an air sliding layer. In the third step, the molten coating components are broken down by compressed air into very fine droplets. These are then sprayed onto the active ingredients.
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