SOFTWOOD:
SPRUCE |
|
| NAMES: |
Pine/Spruce |
| BOTANICAL NAME: |
Picea
abies Karst. |
| ORIGIN AND SPREAD: |
Central-,
South-eastern- and North-eastern Europe; wide artificial spread. |
| MACROSCOPIC CHARACTERISTIC
FEATURES: |
Clear
boarder of annual rings, yellowish white to reddish white colour,
Transition from spring-wood to summer-wood within one year continuously |
| MICROSCOPIC CHARACTERISTIC
FEATURES: |
Arrangement
of the thracheids strictly radial , length of the tracheide up
to 43µ lumen diameter of spring wood up to 45µ, by summer wood
up to 22µ, woodrays heterozellular irregular, horizontal and axial
pitch streak |
|
IMPORTANT TECHNOLOGICAL FEATURES:
|
Dry density (grams/cbm) 0,30
– 0,43 – 0,64
Volume shrinking tolerance (in %) 11,6 – 12,0
Pressure strength (Newton/qm) 33 – 50 – 79
Bending strength (Newton/qm) 49 – 78 –136
Tensile strength (Newton/qm) 21 – 90 – 240
E-Module 7
300 – 11 000 – 21 000
|
|
PROCESS
AND USE:
|
Easy to
saw, to plane, to peel and nailing, gut to stain, drying without
problems, no tendency to tear and warp, difficult to impregnate
Usage as
construction wood for inside and outside; Important raw material
for the paper and pulp industry as well as for the fibre- and
chipboard industry.
Poor natural
durability
|
| SPECIFIC
CHARACTERISTICS: |
Special
wood for music instruments (resonance wood)
Approx.
50 Picea kinds are known.
|
