WDE MASPELL srl

Based on a cylindrical drying cell operating with heating plates and a continuous vacuum (PRIMO model), the WDE MASPELL company proposes a new version of the plate vacuum drying cell that uses a vacuum not only for drying, but also to exert a pressure of 10 tons/m² on the wooden boards during cycle (Pagnozzi patent).

ADVANTAGES OF THE PRESS MODEL

• improves drying quality
• straightens warped boards
• increases drying speed.

CAPACITY
From 0,3 m³ to 10 m³ per cell

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According to international standard ISPM-15 regulations, which provide the guidelines for the herbal heritage of nations safeguarding trouhgt the heat treatment of wood used for packaging, the WDE MASPELL proposes the "PHYTOVAC" system which, installed in its vacuum-drying chambers, can provide greater versatility of them.

The PHYTOVAC system consists in equiping the drying cell with a suitable quantity of probes to measure the air and / or wood temperature, which, connected to a PLC control system, enables a simple and intuitive management, to monitor, store and finally print out every cycle performed by the user, in accordance with the regulations of the country in which the dryer operates.

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It’s been well-known for centuries that subjecting wood to very high temperatures and close to combustion (180° C - 230° C) changes their chemical structure, altering colour, increasing hardness and durability and protecting the wood from attacks from exogenous agents, mould and parasites. Therefore soft woods such as conifers (e.g. pine, spruce and larch) and non-coniferous soft wood (e.g. poplar, birch, alder) may take on very dark colouring and, above all, they can see their durability and hardness features increased, so that they can be assimilated to wood always considered more valuable such as oak and beech, which if treated in the same way, may themselves be darkened and improved in their intrinsic characteristics. WDE MASPELL, in collaboration with the C.N.R. IVALSA Wood Institute of San Michele all’ Adige, has developed a combined treatment of high temperature and vacuum with no additives, capable of reaching the standards of absolute excellence, with its ability to modulate the pressure within their drying cells.

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This type of the drying is performed with cylindrical cell (ROLL model) and with square cell (SQUARE model) operating either with a discontinuous vacuum (Pagnozzi patent) or continuous vacuum since, in each case, heating is generated through ventilation.

ADVANTAGES 
Drying wood stacks with spacer sticks.
Loading wood stacks with fork-lif.

CAPACITY
From 5 m³ a 100 m³ per cell.

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Vaporization is a process that consists in submitting to the action of saturated vapor green wood stacked inside a cell, to increase the temperature around 100 ° C, to change the natural coloring of some woody species (e.g. Beech, Cherry, Walnut and many tropical species).

The cell of the WDE-MASPELL vacuum drying, being by nature an absolutely watertight adiabatic chamber, can become an ideal environment where obtaining saturated vapor at all temperatures between 60 °C and 100 °C through an environmental management of vacuum and temperature, without the need to inject steam in the cell from the outside, but using the same steam produced by the water extracted from the wood, thus generating a process of self-vaporization, which combines the excellent aesthetic result with a low operating cost and a great operational flexibility.

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