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To fit the different needs of users, we have designed two types of  vacuum dryers:  "Ventilated" dryers (model ESV) and "Heating plates vacuum" dryers (model ESP).

The choice of the dryer is made according to the type of product to be treated and the final degree of humidity desired.

 

 

VENTILATED DRYERS WITH DISCONTINUOUS VACUUM (ESV)

They are faster than the conventional drying kiln type and moreover with this type of plant it is possible to obtain a final moisture content between 15 and 12%. They are particularly suitable for drying of wood planks.

  essiccatoio sottovuoto ventilato per legno
       

HEATING PLATES DRYERS WITH CONTINUOUS VACUUM (ESP)

This type of dryers guarantee drying rates even faster than the models ESV.  It is possible to obtain a final moisture of 7%. They are particularly suitable for drying semi-finished products, but they can also treat wood planks.

  essiccatoio sottovuoto con piastre riscaldanti per legno
 
 
 
 
 
 
 

 

The efficient wood vacuum drying technology of WTMVAGLIO

DESCRIPTION

The fundamental principle that underlies vacuum drying is that when the wood is placed under vacuum, the water in the wood starts to boiling and comes out quickly at temperatures below 100° C (45 ° C at -700 mmHg ).

In our dryers it is possible to monitor climate key parameters for drying: wood humidity and EMC of chamber, temperature of wood and heating fluid, air velocity. These parameters are varied according to appropriate drying schedules, fruit of decades of experiences with different species of wood.
Duration can lasts from few days to several weeks, depending on: 
- wood species, heartwood / sapwood 
- thickness of sawn timber 
- initial moisture content of sawn timber 
- drying method and type of cycle adopted 
- desired final moisture

The purpose of drying is to let out the excess water from the wood as rapidly as possible (and economically), but avoiding that excessive moisture gradients can arise.

 

 
 

WHY DRYING WOOD

WITH VACUUM?

      ADVANTAGES
 

-Fast drying speed: up to 20 times faster than conventional dryers;

 

 

-Vacuum drying technology can reduce energy costs by up to 50% compared with conventional drying processes:

shorter drying times and lower temperature minimize heat loss from vacuum drying chambers.

 

- High uniformity in the grade of final humidity;

 

-High quality of dried wood: less checking and end splits (thanks to lower temperatures); less internal stress (thanks to lower moisture gradients);

 

 

-There is no discoloration of the wood: drying in a oxygen-free or oxygen-reduced atmosphere prevents the oxidation of some components of the natural wood. High valuable woods preserve their beautiful grains;

  -Absence of pollutant emissions to air (VOC = volatile organic compounds): the drying process takes place into an hermetically sealed autoclave.