Please enable JavaScript.
Coggle requires JavaScript to display documents.
PLASTICS (Formation techniques (Extrusion (We apply pressure by means of a…
PLASTICS
Formation techniques
Extrusion 
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.
We put thermoplastic, in granular form, Into a previously heated
cylinder.
Lamination
Thermoplastic produced by the extrusion method ls passed through a senes of hot cylinders to produce sheets of varying thtckness.
With this technique, we can produce different finishes, for example, glossy, matt or textured. This depends on the outer coating applied by the final cylinder.
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 te mould to cool, then remove the object.
-
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 theplastic adheres to the sides of the mould and takes its shape.
When the object is cold, we remove it from the mould.
Compression
The outer part of the cavity mould, shaped the same, is closed to compress the matenal inside We then heat it and it becomes soft and mafleabie.
-
We put thermostable plasuc, which can be in granular form,
into the base of a cavity mould.
-
-
-
-
-
Stone and ceramics
Stone
Slate.
Marble and granite .
Stone binders
-
-
Cement.
-
-
-
-
Textiles and leather
-
Synthetic fibres
Synthetic fibres such as nylon, polyester, rayon and Lycra' are plasucs.They are long-lasting, resistant and waterproof.A mixture of natural and syntheticfibresisoftenusedtomaketextiles
Joining plastics
Temporary joints
-
Permanent joints
We use this type of joint when we don't want to separate or dismantle the pieces We can use adhesives or soldenng.
Synthetic fibres
Synthetic fibres such as nylon, polyester, rayon and Lycra' are plasucs.They are long-lasting, resistant and waterproof.
A mixture of natural and synthetic fibres is often used to make textiles .
Stone
These are materials found in nature as large blocks of rock within the Lmineral rock Earth. For example, marble, granite and slate. We can also find them indifferent-sized granules and fragments.
-
-