production of materials - paper and board

Question 1

what are paper and board made from?

Answer 1

cellulose fibres

Question 2

summarise 4 stages of paper and board production

Answer 2

1. trees cut down taken to paper mill
2. bark is stripped. wood chopped into small pieces by chipper
3. chemical or mechanical pulping turns pieces into mushy brown pulp
4. pulp washed and bleached. pressed flat between rollers. dried. cut to size

Question 3

what type of board needs and extra stage in production because of it has flutes and what is that stage?

Answer 3

corrugated card

will need sticking to outer two layers to become a laminate

Question 4

what is mechanical pulping?

Answer 4

grinding down wood to separate fibres

Question 5

what is chemical pulping?

Answer 5

heating wood with chemicals

this dissolves other parts of wood leaving just fibres behind