Sources and origins (AQA GCSE Design and Technology): Flashcards
📚Flashcards
Practise the cards
12 cards from this deck
ShowHide
Practise the cards
12 cards from this deck
What are papers & boards made from?
What are papers & boards made from?
Cellulose fibres
% timber from coniferous trees
% timber from coniferous trees
85%
Why coniferous trees for paper?
Why coniferous trees for paper?
Long, strong fibres make durable products
What is lignin?
What is lignin?
Natural glue holding cellulose fibres together
Chemical breaking down lignin
Chemical breaking down lignin
Sodium hydroxide
% water in pulp slurry
% water in pulp slurry
99%
% fibres in pulp slurry
% fibres in pulp slurry
1%
What is calendaring?
What is calendaring?
Pressing through rollers for uniform thickness
Max energy saved by recycling paper (%)
Max energy saved by recycling paper (%)
Up to 60%
What is duplex board?
What is duplex board?
Two-layer board construction
Structure of corrugated cardboard
Structure of corrugated cardboard
Fluted inner layer between flat outer layers
Purpose of sizing agents
Purpose of sizing agents
Water resistance & improve printability