Microencapsulation by Annular Jet Process

Authored by: Thorsten Brandau

Handbook of Encapsulation and Controlled Release

Print publication date:  November  2015
Online publication date:  December  2015

Print ISBN: 9781482232325
eBook ISBN: 9781482232349
Adobe ISBN:


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Annular jet processes are used, when regular drop generation does not lead to a satisfactory result of the final properties of a particle. A normal particle, generated by a classical process using any jet, for example, atomization, vibrational drip casting, spinning disk, etc., consists of a more or less homogeneous mixture or a single material. The release properties of such particles are typically driven by a diffusion controlled process or by degradation. As, in case of an embedded active, the active is distributed over the total volume of the particle, it is partly unprotected. So, such actives at the outer parts of the particle can and will be subject to evaporation, oxidization, or degradation. In the best case, this means a loss of active. In the works, the final product is gone bad and has to be discarded—just think of a fruit yoghurt highly enriched with Ω3-acid that smells strongly of rancid fish.

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