Please enable JavaScript.
Coggle requires JavaScript to display documents.
PLASTICS, th (21), th (24), th (25), th (31), th (34), th (32), th (35),…
PLASTICS
Formation techniques
Lamination
Thermoplastic produced by the extrusion method is passed through a seriess of hot cylinders to produce sheets of varying thickness
-
Vacuum forming
-
3.We extract the air below the sheet so that the plastic is pulled against the inside walls of the shaped mould and the desired form is created
-
4.We leave the mould to cool, then remove the object
Used to form:bathtubs, dashbnards, shop signs and egg boxes
Extrusion
2.We apply pressure by means of a large, rotatting screw, which forces the melted matenal out, through a nuzzle.
-
-
4.Finally, we collect the pieces of plastic through a feeder system.
Used to form:wrapping, lining for electric cables, tubes and pipes.
Moulding
Blow
-
3.When the object is cold, we remove it from the mould
Used to form: hollow objects, for example bottles and flasks.
-
Compression
-
-
-
-
Used to form: different types of containers, machine bodywork and electrcal appliances
Injection
-
2.When the material has cooled and solidified, we extract it from the mould
-
-
Stone, ceramics and glass
Stone
Marble, granite and slate
-
-
Ceramics
-
-
Physical and chemical properties (Clay is a fine-grained earth composed of aluminium silicates and other substances)
Glass
-
Shaping techniques
Mould blowing:bottles, decanters, test tubes, dunking glasses, etc.
-
Float glass:windows, sheets of plate glass.
-
-
Properties
Strength, elasticity, rigidity and flexibtflty are charactenstics of many plastics (the characteristics of many plastics)
Other properties
-
-
Mechanical:malleabrlity, ductility, mechanical resrstance
-
-
-
Textiles and leather
-
Synthetic
They are long-lasting, resistant and waterproof.
nylon, polyester, rayon and lycra
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-