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Plastics (Properties (mechanical: malleabrlity, ductility, mechanical…
Plastics
Properties
mechanical: malleabrlity, ductility, mechanical resrstance
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• other properties: low density, tmpermeabihty
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Thermoplastics
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They're formed by chains linked laterally and then folded over.
themselves, like a ball of wool or strtng.
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Has four stages
We apply pressure by means of a large, rotattng screw, whtch forces
the melted matenal out, through a nuzzle.
We put thermoplastic, in ganular form into a previously heated cylinder.
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Finally, we collect the pieces of plastic through a feeder system.
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With this technique, we can produce different finishes, for example,
glossy, matt or textured. This depends on the outer coating applied by the
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Formation Techniques
Extrusion
We put thermoplastic, in grandular form, into a previously heated cylinder.
We apply pressure by means of a large, rotattng screw, whtch forces
the melted matenal out, through a nuzzle.
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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
senes of hot cylinders to produce sheets of varying thtckness.
Vaccum 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
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Types
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petroleum, natural gas and carbon The maionty of plastics belong
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Natural plastics are obtained directly from raw vegetable matenals, for example, cellulose or latex, or from animal proteins.
During the manufacturing process, we can add matenals such as
Natural rubber is obtained from latex. flbreglass, textile fibres, paper, silica and sascduct to reduce
production costs, and to develop certain characteristics.
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strengthen the polymers, and we can add pigments to give colour to
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