To protect the primary capsule from environmental factors such as desiccation, a secondary step is required for the production of liquid core microcapsules. The resulting capsule can be seen in the picture below:
Figure 1: Capsule after coating with functional shell.
Beside the enhancement of mechanical stability, the functional shape also improves the usability, the capsule - system is completely dry from the outside. From the outside, it can see the functional coating, which reduces the drying of the capsule and offers an environmental effect protection.
Figure 2: Cross section of a coated capsule.
The coating is realized by the Wuster fluidized bed coating method. The functional coating is applied.