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PLASTICS (properties and calification of plastics (Properties (mechanical,…
PLASTICS
properties and calification of plastics
Properties
mechanical
acustic
electrical
thermal
low density
impermeability
Ecological Properties
chemical recycilng
apply chemical processes to make new materials from the original components
mechanical recycling
separition and crushing
floating
agglutination
extrution
pelletising
energetic recycling
plastics that descompouse on contact with certain bacteria and biological agents
plastics that dissolve in hot or cold water
Thermoplastics
compounds acquired from petroleum. when we heat them they become soft and it can be repeat many times.
Thermostable plastics
these are compunds derved from pretoleum. when heated tehy become soft and can be shaped
Elastomers
they are made by vulcanisation: mixing sulphur and rubber. they are hard, resistant and very elastic
formation techniques
extrusion
(
lamination
vacuum forming
shaping and finishing techniques
cutting
cutter
cut sheets of different thickness
scissors
cut soft thinflexible sheets
steel bit
cut sheets less than 1mm thickness
fretsaw
cut low density plastics
jig saw
cut very large sheets of plastics
power press
cut flat sheets of low density plastic
hot metal thread trimmer
cut sheets of soft thermoplastic
perforating
drill bit
it makes holes in plastic
trimming and filing
a rasp has an even rougher surface
a file has a rough surface
origin and transfomation of plastics
natural plastics
natural plastics are directly obtained from raw vegetable material
syntethic platics
syntethic platics are made from compounds extrated from pretoleum, natural gas and carbon
molding
joining of plastics
when the plastics have been finished you can join picies to each other
temporary joins
mechanical fasteners
nut and bolt
standard screw
double ended screw
permanent joints
adhesives
soldering
joining plastics using heat and presure
