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Strukturne značilnosti in fizikalno-mehanske lastnosti juvenilnega, adultnega in poranitvenega lesa črnega bora (Pinus nigra Arn.) : diplomsko delo (visokošolski strokovni študij)
ID Grahor, Andrej (Author), ID Gorišek, Željko (Mentor) More about this mentor... This link opens in a new window, ID Oven, Primož (Co-mentor), ID Čufar, Katarina (Reviewer)

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PID: 20.500.12556/rul/177d9a77-9ea7-4a40-966a-ef15ec626bba

Abstract
Na lesu črnega bora (Pinus nigra Arn.) smo primerjali gostoto (ru = 12%), ravnovesne vlažnosti lesa (ur), sušilnične in totalne skrčke (ß), prečno krčitveno anizotropijo (An), diferencialno nabrekanje (q), koeficient nabrekanja (h), sorpcijski kvocient (s), tlačno (vzporedno z vlakni) in upogibno trdnost, ter modul elastičnosti (Emodul) pri juvenilnem, adultnemin poranitvenem lesu. Gostota (pri MC = 12%) juvenilnega, kakor tudi poranitvenega lesa, je bila višja od gostote adultnega. Vzrok za višjo gostoto juvenilnega lesa je bila povečana vsebnost smole: ta je vplivala tudi na navidezno višjo ravnovesno vlažnost juvenilnega lesa v primerjavi z adultnim oziroma poranitvenim: med slednjima pa ni bilo opaznih razlik. Značilnih razlik pri krčenju (podobno velja tudi za kazalnike dimenzijske stabilnosti) v radialni in longitudinalni smeri med normalnim in poranitvenim lesom ni bilo, kar pa ne velja za krčenje v tangencialni smeri, ki je bilo pri normalnem lesu večje. Juvenilni les je imel v vseh 3 smereh manjše skrčke od normalnega in poranitvenega. Prečna krčitvena anizotropija je bila največja pri juvenilnem lesu, med ostalima kategorijama pa ni bilo značilnih razlik. Tlačna trdnost vzporedno z vlakni in modul elastičnosti adultnega lesa sta bila večja kot pri poranitvenem lesu, medtem ko je bila upogibna trdnost med obema kategorijama primerljiva. Najslabše mehanske lastnosti (tlačno in upogibno trdnost ter modul elastičnosti) je imel juvenilni les.

Language:Slovenian
Keywords:juvenilni les, adultni les, poranitveni les, krčenje, dimenzijska stabilnost, mehanske lastnosti, Pinus nigra Arn.
Work type:Undergraduate thesis (m5)
Typology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2007
Publisher:[A. Grahor]
Number of pages:XIV, 56 f., [32 f. pril.]
Place:Ljubljana
PID:20.500.12556/RUL-170 This link opens in a new window
UDC:630*811
COBISS.SI-ID:1472393 This link opens in a new window
Publication date in RUL:11.07.2014
Views:1384
Downloads:418
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Secondary language

Language:English
Title:Structural characteristics and physical-mechanical properties of juvenile, adult and wound pine wood (Pinus nigra Arn.) : graduation thesis (higher professional studies)
Abstract:
Density (ru = 12%), equilibrium moisture content (ur), drying and total shrinkage (ß), transversal shrinkage anisotropy (An), ratio of swelling (q), coefficient of swelling (h), ratio of sorption (s), compressive (parallel to grain) and bending strength, and the modulus of elasticity (Emodul) of juvenile, adult and wound of black pine wood (Pinus nigra Arn.) were compared. The density of juvenile wood (at MC = 12%), as well as of wound wood, was higher than the density of adult wood due to high resin content. This was also the reason that the equilibrium moisture content of juvenile wood was higher than those of adult wood and wound wood; the differences between the latter being negligible. There were no typical characteristics in shrinkage (the same pattern was observed also in dimensional stability) in the radial and longitudinal directions between the normal and juvenile wood, which could not be said for the shrinkage in tangential direction - it was more intensive in normal wood. Juvenile wood had lower shrinkage compared to normal and wound wood in all 3 directions. The transversal shrinkage anisotropy was the highest in juvenile wood, while the differences between the other 2 categories were not characteristic. The compressive strength parallel to grain and the modulus of elasticity of adult wood were higher than those of wound wood, while the bending strength between the 2 categories was comparable. Juvenile wood had the lowest mechanical properties (compressive and bending strength, and the modulus of elasticity).

Keywords:wood, juvenile wood, adult wood, wound, schrinkage, dimensional stability, mechanical properties, Pinus nigra Arn.

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