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Plastics (Properties of plastics (-Mechanical: malleabrlity, ductility,…
Plastics
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Properties of plastics
-Mechanical: malleabrlity, ductility, mechanical resIstance-
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-Other properties: low density, impermeability
Ecological properties
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Mechanical recycling
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Extrusion.We melt the material, and then tt's extruded into long filaments
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Energetic recycling
We can incinerate plastics and the energy that
is produced is used tn industry, for heating or producing electnctty.
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Formation techniques
When we manufacture plastic obiects ln Industry, the plasticIs available In three different forms, powder, granules and resins.
Extrusion
We put thermoplastic, in granular form, Into a previously heated cylinder
We apply pressure by means of a large, rotattng screw, which forces the melted matenal out, through a nozzle.
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Finally, we collect the pieces of plastic through a feeder system.
Lamination
Thermoplastic produced by the extrusion method ls passed through a series of hot cylinders to produce sheets of varying thickness
Vacuum forming
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We extract the air below the sheet so that the plastic ts pulled against the instde walls of the shaped mould, and the desired form ts created
We leave the mould to cool, then remove the obiect
Moulding
infection
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When the material has cooled and solidified, we extract it from the mould
blow moulding
We put a tubular-shaped piece of plastic into a hollow mould which has the same shape as the oblect that we want to make
When the object is cold, we remove it from the mould.
We close the mould and blow pressurised air into it,so that the plastic adheres to the sides of the mould and takes its shape.
compression.
We put thermostable plasuc, which can be in granular form, into the base of a cavity mould.
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