2. 1º STEP FOR OBTAINING
PLASTICS
The 1º step is obtaining it from
petroleum.
The 2º step is, when it cools down under
a cold enviroment of water it gets harder
in a moving belt
3. 1st Sourcing of Raw Material
and 2nd Synthesis of
monomers
Taken of from:
mineral, plant or animal origin
Obtained by:
The nature
(need chemical process)
4. METHODS OF SHAPING
AND FINISHING PLASTICS
Thermocompression: Plastic objects
- Hot mold
- Shape it
- Cool down
5. METHODS OF SHAPING AND
FINISHING PLASTICS
Extrusion molding: Pipes and bars
-Hot pipe
-shape and cool down
-Cut and measure
6. METHODS OF SHAPING AND
FINISHING PLASTICS
Blow molding: Containers for liquids
-Liquid
-air pressure mold
-Cool down
7. 3º STEP FOR OBTAINING
PLASTICS
The 3º step is the production of polymers.
Polymers are big particles formed by small
ones.
8. 4º STEEP FOR OBTAINING
PLASTICS
In the fourth steep we give shape to the
polymers and we obtain our object.
9. Shaping And Finishing
Plastics
Vacuum forming: all types of objects,
give shape and modulate polymers.
Foam molding: insulating electricity
areas, obtained from foam objects.
Injection molding: play movil and lego
toys, formed by pression and coldness.
Calendaring: cloths, high temperature.
10. PROPERTIES OF PLASTIC
Physical properties
Electrical conductivity: very low
Thermal conductivity,: very low
Density: low
Expansion: high
Melting point: 200ºc
Fusibility: specific heat
Mechanical properties
Stress: high
Elasticity: low
Plasticity: high
Malleability: slabs and sheets
Ductility: deform under stress
Resistance: very low
Hardness: high
Weldability: high
11. PROPERTIES OF PLASTIC
Chemical properties
Permeability: high
Solubility: only some
Combustibility: high
Biological properties
Recyclability: high
Toxicity: high
Biodegradability:
long time until it
happens
12. THREE GROUPS OF
PLASTICS
Thermosetting: Polymers become
harder, they are shaped when they are
manufactured. Thermal stability.
Thermoplastics: Polymers become
moldable. Transparent and resistance
Elastomers: Polymers with high
viscoelasticity . Impermeable
