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PLASTICS, during the manufacturing procces, we can add materials such as…
PLASTICS
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PROPERTIES OF PLASICS
Strength, elasticity, rigidity and flexibtflty are characteristics of many
plastics, although they vary from one type to another
Ecological propierties
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Mechanical recycling:
1.Separation and crushing
2.Floating
3.Agglutination
4.Extrusion
5.Pelletising
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FORMATION TECHNIQUES
Vacuum forming
- We then use a heater to heat the mould and soften the plasuc.
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the inside walls of the shaped mould, and the desired form ts created
- We leave the mould to cool, then remove the obiect
- We put thermoplastic into a mould.
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Plastics are made by polymers and they play a big part in our daily lives. They are used in many economic and industrial sectors, for example: telecomunications
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during the manufacturing procces, we can add materials such as fribleglass or textile fibres
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We can incorporate chemical additivies to increase flexibility and to strengthen the polymers, and we can add pigments to give colour to the plastics.
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Elastomers
Made by vulcanisationi mixing sulphur and rubber, and heating to 160ºC
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otherproperties: low density, ipermeability
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- We put thermoplastic, in granular form, Into a previously heated
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- We inject melted thermoplastic into a mould
- When the material has cooled and solidified, we extract tt from the mould
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- We apply pressure by means of a large, rotattng screw, whtch forces
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the melted material out, through a nozzle.
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- We cool the shaped material slowly In a refngerated water bath until it´s solid
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- Finally, we collect the pieces of plastic through a feeder system.
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Thermoplastic produced by the extrusion method ls passed through a
series of hot cylinders to produce sheets of varying thickness
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