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PLASTICS - Coggle Diagram
PLASTICS
Plastics are materials formed by polymers. The polymers in plastic are made from long chains of carbon atoms.
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TYPES
NATURAL
They are obtained directly from raw vegetable materials, such as latex.
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SYNTHETIC
They are made from compounds extracted from petrolroleum, natural gas and carbon.Most of the plastics belong to this group.
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FORMATION TECHNIQUES
extrusion
We apply pressure by means of a large, rotattng screw, whtch forces the melted matenal out, through a nozzle
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We put thermoplastic, in granular form, Into a previously heated
example in kitchens or cyhnder
nally, we collect the pieces of plastic through a feeder system.
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lamination
Thermoplastic produced by the extrusion method is passed through series of hot cyllinders to produce sheets of varying thickness
vacuum forming
We put thermoplastic into a mould, then we use a heater to heat the mould and soften the plastic. Then we extract the air below the sheet so that the plastic is pulled against te walls of the mould. Finally we leave the mould to cool and then remoe the object.
moulding
injection
we inject thermoplastic into a mould. 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 that has the same form as the object we want to make, then we close the mould and blow pressurised air into it, so the plastic adheres t the sides of the oul. When its cold we remove it from the mould.
compression
We put thermostable plastic into the base of a cavity mould. The other part of the cavity mould is closed so that the material is compresed inside. Then we heat it so that the plastic adapts to the shape of the mould and when it has cooled and solidified we extract it.
