USCAREA LEMNULUI DE FAG ALB

Ottaviano ALLEGRETTI
PhD in Wood Science - CNR-IVALSA, Italian Research Council - Timber and Trees Institute
Adresa: Via Biasi 75, I-38010 San Michele all'Adige (TN), Italy
Tel: 0039 0461 660203. Fax: 0039 0461 650045. E-mail: allegretti@ivalsa.cnr.it

Rodolfo CIVIDINI
Private consultant
Adresa: Via dei Porta 6/1 36051 (TS), Italy
E-mail: cividinir@yahoo.com

Livio TRAVAN
Eng. - Technical assistance at NARDI International
Adresa: Via Ritonda, S.S.11, 37047 San Bonifacio (VR), Italy
E-mail: livio.t@metal-tecno.com

Rezumat:
Conform unor tendinte periodice, cererea pe piata europeana a produselor semifinite din lemn pentru mobilier si design interior, se indreapta din nou spre lemnul de fag cu aspect natural, de culoare deschisa, cu o usoara tenta spre gri-pal.
Una din principalele probleme este ca nimeni nu stie exact ce inseamna acest fag "alb", iar absenta standardelor si metodelor de sortare creaza confuzie si neintelegeri intre cumparatori si producatori. In opinia generala, se considera fag "alb" cheresteaua cu grosime de 25-100mm, cu o culoare deschisa, uniforma pe toata sectiunea transversala a piesei, de la suprafata pana in centrul acesteia.
Aceste caracteristici nu sunt usor de realizat, mai ales in cazul grosimilor mari si mai ales pe perioada anotimpului cald. Exista multi factori care pot influenta culoarea lemnului atat in timpul procesului de uscare, cat si in timpul operatiilor de pregatire, respectiv in timpul depozitarii bustenilor, a debitarii cherestelei si a depozitarii acesteiea. Prezenta lucrare sintetizeaza experienta si cunostintele autorilor si prezinta cateva reguli principale care pot fi aplicate la uscare pentru a obtine rezultate bune.

Cuvinte cheie: uscare, fag, modificarea culorii.

BIBLIOGRAFIE
ALEON, D. (2002). Beech Drying with Light Colour, without Stain and with Low Residual Stresses. Proceed-ings of COST Action E15 4th Workshop, Santiago de Compostela, Spain.
ALLEGRETTI, O. (2004). Non Symmetrical Drying Test - Experimental Results for Free and Constrained Samples of Beech Wood. 5th European COST E15 Workshop, Athen.
CIVIDINI, R. (2000) Conventional Kiln-Drying of Lumber. Compendium. NARDI Srl, Italy
CIVIDINI, R.; VALENTI, L.; ALLEGRETTI, O. (2003). Investigation On MC Gradients In Vacuum-Press Drying Process Of Beech Elements. Proceedings of 8th International IUFRO Wood Drying Conference, Brasov, Ro-mania.
CIVIDINI, R. (2007). Faggio: segati. Guida all'essiccazione artificiale. NARDI Srl, Italy
KARKI, T.; MOTTONEN, V. (2004). Preventing Discolouration of Birch (Betula pendula, B. pubescens) in HT Drying. 5th European COST E15 Workshop, Athen.
KOCH, G. (2004). Discoloration of Wood during Storage and Drying. 5th European COST E15 Workshop, Athen.
KOCH, G.; BAUCH, J. (2000). Discolouration in European Beechwood (Fagus sylvatica L.) during Storage and Drying. Proceedings of COST Action E15 2nd Workshop on Quality Drying of Hardwood, Sopron, Hun-gary.
KOCH, G.; WELLING, G. (2006). Verfärbungen - nicht immer ist die Trocknung schuld (Colour Changes - Not Always the Fault of Drying) - EDG Drying Seminar, Hamburg.
NEGRI, M.; TESSADRI, B.; GAETI, N.; VALENTI, L. (2004). Physical Properties in Wood during Press-Vacuum Drying: Colour Changes and Other Phenomena. 5th European COST E15 Workshop, Athen.
STRAZE, A.; OVEN, P.; ZUPANCIC, M.; GORISEK, Z. (2003). Colour Changes of Ash-Wood (Fraxinus ex-celsior L.) during Conventional Drying. Proceedings of 8th IUFRO International Wood Drying Conference, Brasov, Romania.