Materials

Question 1

how is paper made?

Answer 1

1. wood is barked
2. then it is cut and pulped
3. water is added to the pulp
4. wood pulp
5. chemicals are added to the pulp and its is filtered
6. the paper is then put on rolls

Question 2

What are the main features of hardwood

Answer 2

• deciduous
• has leaves
• grows slower than coniferous
• tighter grain
• expensive
• more dense and stronger

Question 3

What are the main features of softwood

Answer 3

• coniferous (evergreen)
• sustainable - grows fast (30 years to reach maturity)
• cheaper
• holds resin, may leak
• prone to water damage
• e.g. pine

Question 4

features of wood

Answer 4

• number of rings correlates to age
• timber comes from trees
• knots and grains
• knots where branches grow
• flammable
• hard and soft wood

Question 5

Thermoplastics

Answer 5

• long thin chains of molecules tangled with no fixed pattern, few links across the pattern
• when heated become soft and can be shaped
• can be reheated and reshaped many times

Question 6

Thermo-setting plastics

Answer 6

• created with a resin and a catalyst
• long ‘cross-linked’ chains of molecules make for a rigid structure
• when heated become but only once, stiffen when cooled
• cannot be reheated and reshaped