timber Flashcards
in hard wood annular rings are
less distinct and nearer to each other
timber can be made fire resistant by
soaking in ammonium sulphate
seasoning best for large scale
kiln seasoning
boucherie process is used for
treatment of green timber
in wood how many coats of plastering is reqd
no plastreing we only do painting
modulus of elasticity of timber is
0.5 to 1 x 10^4 N/mm2
time taken for artificial seasoning of timber
4 - 5 days
defect caused by imperfect seasoning
honeycombing
When timber is burnt in the wood fire over a depth of about 15 mm, the process of treatment is known as______.
charring
time taken for natural seasoning of timber
60 - 90 days
decraesing order of effectiveness of method of preservation of timber
brushing/spraying>dipping>pressure impregnation
The defect caused due to over-maturity and unventilated storage of the wood during its transit, is called
foxiness
which quality of timber can be improved by abels process
fire resistance
creosote oil applied in timber helps
protects from fungi
code for seasoning
IS 1141-1948
bethels process is used for
seasoning of timber
trees used for making sports goods
willow trees, mulberry
wooden mould is made from
shsishum wood
timber having maxm resistance against white ants and higher valuw
teak
the piece of sawn timber whose dimensions do not exceed 5 cm either in breadth or in thickness is known as
batten
life of teak wood doors and windows
40 yrs
timber used for
- tennis rackets
- agricultural tools
- boats
- furniture
tennis rackets - mulberry
- agricultural tools - babul
- boats - BEN TEAK
- furniture - bijasal
which is strongest, least durable, lightest?
strongest - sal
least durable - mango
lightest - deodar
advantage of plywood
tensile strength is same in all directions reduced shrinkage and swelling availability of thin large size sheets greater impact resistance obtained from timber
in plywood grains of veneer are
at right angles
fibre board (hard board) can be used for
furniture
