DRYIT Semi-Continuous Tray Drier
Practical Action
Important Notice to Constructors
This manual is intended to be used with Practical Action’s engineering drawings TD001 to
TD102.These are available on the website to down load electronically, alternatively you can
contact Practical Action and have them sent on electronically or on paper.
Most of the drier is made from mild steel angle, which should be as straight, flat and square
as possible. The drier should be built on a horizontal, flat floor; otherwise fitting the trays will
be very difficult.
Particular care must be given to ensuring parts are correctly positioned before they are
welded.
Where materials are not available in the sizes specified in the manual and drawings, give
serious thought to how substitution with material of a different size will affect the function of
that part of the machine:
• Will this substitution alter other dimensions?
• Will the change weaken the finished machine?
• Will it make the machine less durable?
It is usually better to use a larger steel section than a smaller one.
Components, which slide together, should not be painted on the sliding surfaces but should
be oiled as the unit is assembled.
Lead paint must not be used to paint any part of the drier, being a toxic substance it could
contaminate food being dried.
On page 3 of this manual is a checklist, which should be read before and after completing
the drier.
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