T r i t h e r m

SPECIALIST  IN  HEATING  &  DRYING   SINCE  1995    

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THE VACUUM DRYING PROCESS

A Vacuum dryer operates in an airtight chamber maintaining an air pressure  much lower than the normal atmospheric pressure. The boiling point of water is reduced  substantially at the lowered pressure. As the wood is first heated to a predetermined temperature where boiling will take place, a vacuum is applied. Wood moisture in the wood core will turn into vapour and  force its way out from inside the wood core. Unlike conventional drying, the moisture starts to move out only when the wood surface moisture content (EMC) is much lower than the wood core moisture content. This moisture gradient , that cause stresses between the outer face and inner core of the timber, has to be controlled accurately and slowly otherwise drying defects will be severe.Drying under vacuum condition , this moisture gradient is negligible resulting in gentler and faster  drying with very little or no drying defects.

Wood-drying in an oxygen-free or oxygen-reduced environments also has other advantages. In particular, the discoloration of wood is partly or completely reduced.

Tritherm’s conventional  vacuum dryer comes complete with an automatic sawdust fired hot water heater. For places where wood burning is not permitted, Tritherm has designed an Electrically operated vacuum dryer using heat  pump system. The heat from the compressor is used for heating and the cool evaporator side is used for condensing the water vapour.  The condensed water is then  drained out .

Due to constraints in shipping and to have the most effective diameter, our vacuum dryers have a standard diameter  of  2.3m. The length of the vessel will depend on the capacity required. Our standard  loaded timber capacities are 10 , 15, and 20 m3.

Tritherm fully understands the fundamentals of Vacuum Drying and has plenty of experience solving vacuum drying problems. Our Vacuum dryer comes with a fully automatic controller with wireless moisture probes.

TIMBER VACUUM DRYERS

Small wood pellet or sawdust fired hot water heater with automatic feeder & mini silo.