T r i t h e r m
SPECIALIST IN HEATING & DRYING SINCE 1995
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-
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.