VERTICAL VARIATION IN PHYSICO-CHEMICAL AND MECHANICAL PROPERTIES OF Toona ciliata M. Roem.
Loading...
Date
2020-10
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
NAUNI,UHF
Abstract
ABSTRACT
The present research entitled “Vertical variation in physico-chemical and mechanical
mechanicalof Toona ciliata M. Roem.” was carried out in the Laboratory and Wood Workshop in the
Department of Forest Products, College of Forestry, Dr Y S Parmar University of Horticulture and
Forestry, Nauni, Solan (HP) during 2018-19 and 2019-20. Toona ciliata tree of age about thirty-fiveyear
was felled and converted into seven logs (base 0%, 15%, 30%, 45%, 60%, 75% and 90%) of total
bole height to investigate the physical, chemical and strength properties of the wood. It showed
significant variation along the bole height. The values of diameter, bark percentage ranged between
24.90 cm (90%) to 52.00 cm (base) and 5.21 per cent (90%) to 7.72 per cent (base), respectively. The
maximum moisture content (143.61%) was maximum at 90 per cent and minimum (103.96%) at base.
Maximum specific gravity (0.591) was recorded from base and minimum (0.481) was recorded from
90 per cent. The values for fibre length and fibre diameter ranged between 0.96 mm (90%) to 1.09
mm (base) and 0.020 mm (90%) to 0.026 mm (base), respectively. The cold water-soluble extractives,
hot water-soluble extractives, alcohol-benzene soluble extractives, holocellulose content, lignin
content and ash content ranged between 4.73 per cent (90%) to 6.05 per cent (base), 7.33 per cent
(90%) to 8.15 per cent (base), 7.19 per cent (90%) to 8.93 per cent (base), 69.33 per cent (base) to
71.37 per cent (90%), 22.18 per cent (90%) to 24.07 per cent (base) and 1.72 per cent (base) to 2.70
per cent (90%) of total bole height, respectively. The tensile strength, bending strength, compressive
strength parallel to grain, compression strength perpendicular to grain, bending modulus of rupture,
modulus elasticity in tensile strength, modulus of elasticity in bending strength, modulus of elasticity
compression parallel to grain, modulus of elasticity compression perpendicular to grain were ranged
between 0.043 kN/mm2 (90%) to 0.077 kN/mm2 (base), 0.009 kN/mm2 (90%) to 0.012 kN/mm2 (base),
0.049 kN/mm2 (90%) to 0.054 kN/mm2 (base), 0.015 kN/mm2 (90%) to 0.028 kN/mm2 (45%), 0.211
kN/mm2 (90%) to 0.225 kN/mm2 (base), 0.697 kN/mm2 (90%) to 1.287 kN/mm2 (15%), 7.424
kN/mm2 (90%) to 10.551 kN/mm2 (base), 0.477 kN/mm2 (60%) to 0.784 kN/mm2 (base) and 0.045
kN/mm2 (15%) to 0.088 kN/mm2 (30%), respectively.