Mogućnost sušenja elemenata hrasta i jasena sa korom

Abstract

Predmet ovog rada je analiza mogućnosti sušenja rezanih elemenata hrasta i jasena sa prisutnom korom drveta na jednoj strani elementa. Osušena je jedna šarža hrastovih i jedna jasenovih elemenata pri čemu je proces vođen daljinskim elektrovlagomerima u sušari, ali je vlažnost određivana i gravimetrijskim metodom. Analizirane su i greške sušenja i njihovi uzroci. Rezultati su pokazali da se konvencionalno sušenje može koristiti za ovu namenu - trajanje je relativno kratko (do 7 dana), a varijacija konačne vlažnosti relativno mala. Osnovni problem je relativno veliki broj zakrivljenih elemenata na kraju sušenja, isključivo onih gde je učešće drveta u odnosu na koru malo. Vrlo visoki koeficijenti aksijalnog utezanja kore (4,5 puta veći od drveta) su uzrok ovih deformacija.

The subject of this paper is the analysis of the possibility of drying oak and ash elements with the presence of tree bark on one side of the element (bark edge). One batch was dried per species, and the process was controlled by moisture content (MC) probes in the kiln, but also determined by the oven-dry method. Drying defects and their causes were also analyzed. The results showed that conventional drying can be used for this purpose - the duration is relatively short (up to 7 days), and the variation of the final MC is relatively small. The main problem is a relatively large number of crooked elements at the end of drying, particularly those where the share of wood in relation to the bark was small. Very high axial shrinkage coefficients of the bark (4.5 times higher than wood) are the cause of these deformations.