key words Flashcards
what does conversion do
turn trees into timber
what are the two methods of conversion
slab / plain sawing
quarter sawing
what slab / plain sawing
produces timber which is less stable and more prone to warping
what is quarter sawing
produces more stable timber, often with more attractive grain patterns but is more expensive
what is seasoning
newly cut timber is left to dry
what is the percentage seasoning is aiming to reduce the moisture of timber
reduce the moisture by 20 percent
what are the benefits of seasoning
- increases strength and stability of timber
- reduce moisture = reduce risk of timber casuing corrosion to the surrounding metal work
defects of timber
if not seasoned correctly its shape can change which makes it more difficult to use
what are knots and what can they do to wood
where branches of the tree grew
can weaken the structure of wood as well as produce irregular grain which makes it more difficult to work iwth
what are veneers
thin layers of wood that have been peeled off the truck of a tree
what are veneers made from
hardwood
- more decorative than soft woods
what is laminates
process of gluing layers of material together
veneers = plywood
what does lamination do
improve strength
improve aesthetic
what is plywood
kayers of hardwood laminated together
arranging layers so that the grain is 90 degrees to the prevuious layer, a very strong material is made
what is forest stewardship council
non-gov
promote responsible management of worlds forest
