Flashcards
plastics/polymers tech
Cards in this deck (26)
- 1A polymer isA non-stick solid made up of long chains of molecules which are formed by joining shorter chain molecules
- 2Plastic comes from the greek wordPlaskos which means mould
- 3the raw materials of polymer areICI and dupont
- 4thermo-softening polymers aresoft and can be reshaped many times after heating
- 5thermo-setting polymers areharder stronger and can not be softened and reshaped after heating
- 6composite materials aremixtures of metal, ceramics and polymers
- 71.composite fibers provide 2. Polymers...1. strength
2. hold fibers together - 8two types of thermosetting polymers are1. epoxy resin - used to make very strong adhesives
2. polyester resin - used to make surf boards and swimming pools - 9two types of thermosoftening polymers are1. acrylic- car lights, baths, shop signs
2. polystyrene - food containers, toys, CD cases packaging - 10combination squarused for measuring 45 angles and 90 angles
- 11steel ruleused for measuring and drawing straight lines
- 12tape measureused for measuring distances greater than 300mm and curved surfaces
- 13compass and spring dividersused for marking circles and arks
- 14templates are used fortracing around to help get the right shape
- 15scoring bladeused for scratching shallow groves so that the polymer cam be broken along the scored line
- 16hack sawused for cutting polymers
- 17band saw and scroll sawused for cutting sheet polymers along strait and curved lines
- 18circular sawused for cutting sheets of polymers along very strait lines
- 19filesused for finishing edges
- 20the three types of filing arecross filing, strait filing, draw filing
- 21the three types of files areflat smooth, flat basted, second cut
- 22the first step in finishing polymers istrimming the edges because it was cut with a table saw
- 23the second step in finishing iscross filing with a second cut or flat basted then draw filing with a flat basted or second cut
- 24the third step in finishing isstrait, cross and draw filing with a hand smooth and sanding it with 400 grit wet and dry
- 25the forth step in finishing ispolishing it with braso or the buffing wheel
- 26two was to join polymers areadhesive bonding and cohesive bonding
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- tech Flashcards on plastics/polymers tech, created by maebhy wavy on 11/11/2013.
- Created by
- maebhy wavy · Nov 2013
- Updated
- Feb 19, 2016
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