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Polymer Injection molding

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Polymer Injection molding Powered By Docstoc
					       Eric Otero
    Felix Rivera
Christian Vargas
 Large molecules with a huge molecular
  mass
 Made of repeating structural units
  (monomers)
 Connected by covalent chemical bonds
 poly – “many”; -mers – “parts”
 Examples: plastics, rubbers and polyester
Plastics:
 Thermoplastic polymers or thermoplastics


  Thermosetting   polymers or thermosets

Rubbers:
 Elastomers
Is a manufacturing process in which a
polymer is heated to a highly plastic state
and forced to flow under high pressure into
a mold cavity, where it solidifies.
http://www.cheresources.com/injectionzz.shtml
Advantages
•    It has the most precise control of
    shape and dimensions.
•    Highly automatic process.
•    Fast cycle time.


Disadvantages
• It has high setup cost.
• Only good for large numbers of parts.
• Large pressures in mold (20,000 psi).
http://www.cheresources.com/injectionzz.shtml

				
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