Spray coating microencapsulation deposit atomized droplets onto a solid particle. This process takes many forms and different names, including fluid-bed coating, Wurster coating, air-suspension coating, pan coating and granulation. Solid-core particles are suspended in air (fluid-bed coating) or rotated in a drum (pan coating), followed by the introduction of an aerosol containing the shell material.
The aerosol may be solvent-based or a melt material. The droplets wet and spread around the solid core particles and are solidified through drying or congealing. Subsequent droplets wet the surface and dry, creating a buildup of shell material around the solid core.
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Laboratories & Instruments
SwRI hosts multiple spray-coating systems for fluid-bed coating, pan coating, granulation and agglomeration. Our on-site lab and pilot-scale equipment offer versability for preparing a variety of encapsulated products to meet client objectives.
- Batch sizes from 50 g to 5 kg
- Particle sizes from 50 µm to >10 mm
- Top spray, bottom spray
- Wurster coating
- Aqueous, solvent and “melt” feedstock
- Nitrogen atmosphere
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For additional information, please contact James Oxley at +1 210 522 2913 and Joseph Persyn at +1 210 522 2691 or visit Microencapsulation Techniques.