wood theory resistant materials little heath
DESCRIPTION
Information on wood theory, how wood rots, types of wood and their uses.TRANSCRIPT
Types of Wood
There are 3 Types of wood
Man made board
HardwoodSoftwood
Softwood comes from evergreen trees
Evergreen treesHave very thinNeedle likeLeaves that stay on thetree duringwinterPINE
Some softwood shrubs do have wider leaves, but the are hard and waxy
Holly Laurel
Hardwood comes from deciduous trees
BEECHDeciduous trees have broader paper likeleaves that change colour during the year and fall off in the winter
Some other trees whose wood is widely used
Oak Maple Elm
Man made wood is made in factories
We use wood leftovers like sawdust and chippings to make boards
How wood grows and rots
Softwood trees grow quicklyso their growth rings are wider,
which makes the grain wider
Wider wood grain
Hard wood grows slowerso the growth rings are smaller,
which makes the grain closer
Closer wood grain
This is a tree stump where you can see the growth rings.
After a few years the tree stump will rot away, caused by the weather, fungi and insects.
We can prevent wood from rotting away by protecting it. We could use such things as varnish and wax
Ways that wood is used
Because Hardwood grows slower, it ismore expensive. It is resistant to decay and it is
more water resistant because of oils in the wood. Because of this it is used to build garden furniture,
boats and quality furniture
Soft wood is cheaper than hardwood and used to make cheaper furniture and less quality items because it grows quickly and can therefore be
processed and produced quickly.
Man made woods are the cheapest. They are made from wood scraps such as
chippings and sawdust. They make kitchen cupboards and the cheapest furniture