Please enable JavaScript.
Coggle requires JavaScript to display documents.
plastics 1, Plastics 3, Plastics 2 - Coggle Diagram
plastics 1
Properties of plastics
mechanical: malleabrlity, ductility, mechanical resistance
-
-
-
-
other properties: low density, impermeablihty
-
-
-
Plastics 3
Extrusion
We put thermoplastic, in granular 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.
-
Finally, we collect the pieces of plastic through a feeder system.
-
Vacuum forming
-
-
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
injection
-
When the material has cooled and solidified, we extract tt 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
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.
When the object is cold, we remove it from the mould.
-
compression
We put thermostable plasuc, which can be in granular form,
into the base of a cavity mould.
The outer part of the cavity
mould, shaped the same, is closed to compress the material inside We then heat it and it
becomes soft and mafleabie
-
-
Lamination
Thermoplastic produced by the extrusion method ls passed through a
senes of hot cylinders to produce sheets of varying thtckness.
-
Plastics 2
-
-
Elastomers
Made by vulcanisationi mixing sulphur and rubber, and heating to 160 C
-
