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Sherwood Laboratory Fluid Bed
Dryer
Sherwood Scientific have developed and manufactured a
range of two general purpose Fluid Bed Dryers (FBDs): one analogue and one with
digital controls of airspeed, temperature, and time. In addition we have
developed a programmable version where drying programmes can be created, and
stored on computers.
Key Features
- The laboratory fluid bed dryer offers significant
advantages over conventional drying techniques
- The high rates of heat and mass transfer ensure much
faster and more homogeneous drying than other methods such as oven and vacuum
drying.
- Drying times range from a few seconds to minutes.
Complete drying is usually achieved in under 15 mins, the exact time for a
given sample, airflow rate and temperature setting being very repeatable. A
uniform reproducible moisture content can also be achieved with the appropriate
settings.
- The temperature range from ambient to 200°C
covers the majority of drying and solvent removal operations. Due to good
mixing, the sample temperature is uniform and under close control during
drying. This proves advantageous when drying heat sensitive materials or
coating particles.
- Among the wide range of materials that can be
processed are pharmaceuticals, chemicals, minerals, foods, coals, wood chips,
plastics, resins, etc. Ask for our specific applications sheet on your
material.
Filter Bag Materials
The filter bags fitted to the top of the drying tubs
retain any stray particles of the sample being fluidised while allowing the
passage of the exit gases. There are just two sizes of bag for the whole range
of tubs and a wide choice of materials to ensure compatibility with the
substance being dried and the drying temperature. 
Nylon and terylene are normally chosen as filter bag
materials; nylon is resistant to alkali vapours while terylene shows greater
stability with acids. Polypropylene is inert to most chemicals but degrades
more rapidly than the above materials over 100°C. A special alkali-tolerant
material, nomex, is available for sustained high-temperature drying, e.g.
around 200°C. Finally, a fluorocarbon filter bag can be used when tolerance
to both high temperature and a broad range of chemicals is required.
For
further information and prices, please click
here.
Please also visit the Sherwood Website for further
information
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