Chapter 5 Flashcards
Polymers
A long chain substance made of bonded monomers and have identical molecular structure
Monomer
the smaller units from which larger molecules are made.
Synthetic
Something created to imitate a natural product
Polymerisation
Chemical procces of monomers joining together to form polymers
Catalysts
Chemicals that cause a reaction to happen and speed up the process
Additives
Substances added to polymers to improve their mechanical properties
Stockforms
the standard shapes and sizes in which a. material is available
Examples of working properties
How they look?
What are they commonly used for?
How do they perform in use?
What are materials selected by
Working properties
What are paper and boards selected by
The purpose they are going to be used for
Examples of purposes of paper and boards
Packaging
Drawing and sketching
Model making
what is the selection criteria of board and papers
How easy is it to recycle
How expensive is it t
What will the use be for it
Does it have any special properties
What can you do on paper and boards
Texture
Embossing
Printing
Laminating
Sketching
Drawing
Building models
How is paper made
1- wood pulp is obtained from cutting down trees
2- The bark and chippings are then removed and ground down or cooked with chemicals to extract the cellulose fibres.
What does corrugated cardboard do?
Gives compressive strength
What is a use of corrugated card
Packaging products for transportation
Why is it good to score cards
So it can be folded more easily
What is paper made out of
New fibres or recycled materials
Common weights used for paper
80 to 170
A weight greater than ______ is classified as a board rather than paper
170gsm
What is the thickness of board measured in
Microns
Paper types
Layout paper
Copier paper
Cartridge paper
Bleedproof paper
Sugar paper
What is offset lithography?
A commercial printing method that uses four colours, cyan, magenta, yellow and black (CMYK).
White board
High quality white card
