How does a desiccant help in drying and storing wood?

With­out water, all rep­re­sen­ta­tives of the flo­ra invari­ably begin to dry out from the inside and sub­se­quent­ly break down. This also applies to trees grow­ing in their nat­ur­al envi­ron­ment — they must include a large amount of liq­uid. There­fore, from young trees after a log house, raw mate­ri­als con­tain­ing more than 35% mois­ture are obtained. Dur­ing stor­age, such an abun­dance of mois­ture leads to rot­ting, mold and shrink­age of wood. And as a result, the raw mate­r­i­al becomes unsuit­able for fur­ther use.

How to find out the lev­el of mois­ture in wood, how much mois­ture should be con­tained in the mate­r­i­al for dif­fer­ent pur­pos­es of its appli­ca­tion, in what ways dry­ing is car­ried out and how an air des­ic­cant helps in this process — more details in the arti­cle. Read below!

Inter­est­ing arti­cle: “Con­di­tions for stor­ing wine and how to main­tain them”



How much moisture does wood contain: we make miscalculations


Before pro­ceed­ing with the cal­cu­la­tions, it should be not­ed that:

Rel­a­tive Humid­i­ty is an indi­ca­tor of the ratio of the mass of wood mois­ture to the mass of the mate­r­i­al in the wet state.

Absolute humid­i­ty — this is the ratio of the mass of mois­ture in the raw mate­r­i­al to the mass of mois­ture of the wood, which has been dried to a com­plete­ly dry state.

Impor­tant infor­ma­tion: “A des­ic­cant at a car wash. More cars — more prof­it”

Both para­me­ters are mea­sured as a per­cent­age.

What deter­mines the mois­ture con­tent of a tree? From the rel­a­tive humid­i­ty of the air and the ambi­ent tem­per­a­ture. It fol­lows from this that dry raw mate­ri­als “take away” the miss­ing liq­uid from the atmos­phere, and wet, on the con­trary, “give away” excess mois­ture.

To deter­mine how much mois­ture wood con­tains when stored indoors, a spe­cial chart has been devel­oped in which out­side tem­per­a­tures are shown hor­i­zon­tal­ly, air humid­i­ty is shown ver­ti­cal­ly, and diag­o­nal stripes show wood mois­ture con­tent. The accu­ra­cy of indi­ca­tors does not exceed 0.75%.

Mate­r­i­al for cheese mak­ers: “Why do you need a des­ic­cant in cheese pro­duc­tion?”


Recommended moisture content of wood depending on the purpose


Wood is used for var­i­ous pur­pos­es: the man­u­fac­ture of inte­ri­or items, the con­struc­tion of air­craft, the cre­ation of musi­cal instru­ments, etc. The mois­ture lev­el of raw mate­ri­als must be main­tained with­in the range rec­om­mend­ed specif­i­cal­ly for a par­tic­u­lar pur­pose.

The indi­ca­tors that need to be achieved in the process of dry­ing wood are shown in the table:

Pur­pose
Mois­ture lev­el in %
Pro­duc­tion of chip­board, ply­wood 6–8
Pro­duc­tion of com­po­nents for marine ves­sels 12–16
Mak­ing musi­cal instru­ments 5–8
Man­u­fac­ture of sports equip­ment, exer­cise equip­ment 8–12
Man­u­fac­tur­ing of elec­tri­cal appli­ances 5–8
Mak­ing Tools for the Gar­den 12–16
Pro­duc­tion of train ele­ments 6–8
Cre­at­ing Fur­nish­ings 6–10
Pro­duc­tion of par­quet board 6–8
Cre­at­ing Air­craft Parts 6–10
Mak­ing chil­dren’s toys 6–10
Cre­at­ing weapon parts 7–12
Pro­duc­tion of inte­ri­or doors and win­dow struc­tures 8–10
Man­u­fac­ture of exter­nal win­dows and doors 12–15
Cre­ation of agri­cul­tur­al machin­ery 12–18

To use wood as a build­ing mate­r­i­al, it is dried up to 12–18%, and for use in ser­vice rooms — from 16% to 20%.

See also: “A des­ic­cant for dry­ing fish — we speed up pro­duc­tion by 2–3 times”


Wood drying technologies


There are 2 ways to dry wood:

1. Natural drying of wood

All meth­ods of dry­ing this nat­ur­al mate­r­i­al are based on the influ­ence of the ambi­ent air on the mois­ture con­tent of the raw mate­r­i­al. There­fore, in order to achieve opti­mal per­for­mance in wood, it is nec­es­sary to cre­ate an appro­pri­ate micro­cli­mate in the room where the wood is dried and sub­se­quent­ly stored.

As already described above, the mois­ture con­tent of the mate­r­i­al depends on the pur­pose of its appli­ca­tion and fluc­tu­ates approx­i­mate­ly in the range of 5–18%. It is pos­si­ble to dry raw mate­ri­als in a nat­ur­al way, for exam­ple, for the man­u­fac­ture of fur­ni­ture. But this process, first­ly, direct­ly depends on the “whims” of nature and takes a very long time. But arti­fi­cial­ly, this pro­ce­dure is much faster and eas­i­er.

2. Artificial drying of wood

Wood dry­ing occurs in most cas­es using two tech­nolo­gies:

Through the instal­la­tion of a sup­ply and exhaust ven­ti­la­tion sys­tem in the room, which has a mechan­i­cal con­trol method.

By installing mod­ern equip­ment specif­i­cal­ly designed for dehu­mid­i­fy­ing the air in the premis­es — a dehu­mid­i­fi­er.

Learn: “Why do we need an indus­tri­al des­ic­cant in the con­fec­tionery indus­try”

The first option works accord­ing to the fol­low­ing prin­ci­ple: the ven­ti­la­tion sys­tem draws mois­ture-sat­u­rat­ed air flows from the room, and returns heat­ed air. This method shows excel­lent results, how­ev­er, in terms of prof­itabil­i­ty, it is less prof­itable than using a des­ic­cant.

The sec­ond option, in which the des­ic­cant works ‑15-+35°С / ‑30-+40°С / 5–35°С or 1–35°С, is sim­pler and more prof­itable in finan­cial terms. These devices belong to “smart” tech­nol­o­gy, which inde­pen­dent­ly main­tains the desired degree of humid­i­ty in the room. To dry and store wood, a per­son only needs to set the set­tings on the unit and peri­od­i­cal­ly drain the col­lect­ed con­den­sate. And if you make a drainage sys­tem, the drainage process will take place con­tin­u­ous­ly.

We draw a con­clu­sion: the arti­fi­cial method of dry­ing wood, in com­par­i­son with the nat­ur­al one, is sim­pler, more eco­nom­i­cal and faster. And with the main­te­nance of opti­mal humid­i­ty indi­ca­tors, the best way to cope is with an air dry­er.

Read also: “Adsorp­tion des­ic­cant — why is it need­ed in the pro­duc­tion of frozen foods”

In order for the dry­ing and stor­age of wood to take place in accor­dance with the require­ments, it is impor­tant to buy a good des­ic­cant (for exam­ple, from the com­pa­ny Storm, Cel­sius, Trotec, Cooper&Hunter, DT Group). Con­tact the man­agers of the Pobut online store and they will help you choose the right device based on the pur­pose of use and your bud­get. Call: (099) 389 94 49.

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