How to choose which EMV is the most suitable for one’s requirements?

Drying times depending on the humidity and the initial thickness of the wood

To choose a vacuum drier suitable

How to choose a vacuum drier, but above all how to calculate its size according to one’s requirements?

The main parameters to be taken into consideration are as follows:

  • cu.m of wood to be dried per unit of time;
  • type of wood (pine, fir-wood, oak, etc.);
  • thickness of semi-finished product in mm;
  • initial humidity level.

From the graph below, some indications can be had of drying times on the basis of initial humidity level and thickness of wood.
By centring the initial humidity level of the boards with the vertical line of the thickness and then by moving down to where the whitish-grey lines of the different types of wood are crossed, the duration of the drying process, expressed in days, can be set.

For example, supposing you needed to dry 70 m3 a month of pine or fir having 30% initial humidity and a thickness of 32 mm, on the basis of the graph the time needed would be about 2 days (final humidity 10%).
Over a month, considering the plant will be working automatically, 14 drying cycles can easily be carried out.
The net capacity of the autoclave will therefore be equal to: 70 m3 /month ÷ 14 monthly cycles = 5 m3.

From this result it is easy to see how the reduction in drying times means smaller capacity driers can be used compared with the volume of wood to be dried.

The advantages are clearly several and range from saving of space to easier insertion in the company drying process logistics.
Not least, the monolithic characteristics of ISVE driers permits easy re-positioning should a change be required in the company production line.

Quality of drying and design quality are two important features of ISVE EMV driers, making them simple to use and easy to insert in the company production cycle.