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PLASTICS, image, image, image, image, image, image, image, image, image,…
PLASTICS
Properties
Strength, elasticity, rigidity and flexibtflty are charactenstics of many plastics
mechanical: malleabrlity, ductility, mechanical resistance
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other propierties: low density, impearmbelity
Formation techniques
Extursion: Used to form; wrapping,liningfor electric cables, tubes and pipes
Lamination: Used to form: worktops, to cover surfaces of kitchen cupboards and
drawers
Vacuum forming: Used to form: bathtubs, dashboards, shop signs and egg boxes
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Blow moulding : Used to form: hollow oblects, for example bottles and flasks.
Compression: Used to form: different types of containers, machine bodywork and electrical appliance
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Textiles and leather
Vegetable origin: Cotton. linen, hemp
Animal origin: Wool, silk
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Synthetic fibres: Synthetic fibres such as nylon, polyester, rayon and Lycra' are plastics. They are long-lasting, resistant and waterproof.
clasifications
Thermoplastics: They' re made up of weakly formed molecular chains. When we heat them, they become soft
Thermostable plastics: They are formed by strongly-linked chams runmng in different directions. When heated, they become soft and can be sharped.
Elastomers: They are hard, resistant and very elastic-stretching easily under force They' re formed by chains linked laterally and then folded over themeselves
Joining plastic:
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When plastics have been formed, shaped and finished, we can join pieces to each other
Stone and ceramics
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Stone binders: Sand and gravel are used directly to make asphalt and also for binders,
which are used to 'bind' or join other materials together
Ceramics: Clay is a fine-grained earth composed of aluminium silicates and other galzed: finished with
a shiny, substances We can mould it easily when it's wet.
Ecological properties
Chemical recycling We apply chemical processes to make new matenals from the original components of plastic residues.
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Glass
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Shaping techniques:
Mould blowing: We put the paste into a hollow mouldwhich has the shape of the obiect we want to make
Float glass making: We float molten glass on top of a layer of molten tin. The glass spreads to form a sheet that we pass through a system of rollers
Lamination: Lam ination
We pass the soft material through a system of rollers. The roflers can be smooth, or engraved to create a design on the glass
Shaping techniques
Cutting
cutter, scisors, steel bit, fretsaw, jig saw, power press,
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