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General characteristics and uses of plastic

Posted by hasnan | |

The structure, properties and uses of the materials deeply related to the injection molding are explained below so that the forming material will be understood well

Thermosetting Plastic

This type have Amorphous structure, During the irradiation of diamond by carbon atoms, amorphization of the crystal structure may occur and two specific amorphous forms of carbon may appear, he diamond like amorphous carbon which will be denoted by ta-C and the graphite like amorphous carbon named a-C. These two structures can be distinguish clearly by their macroscopic and microscopic properties

Types of Plastics

  • Phenol (PF)
  • Urea (UF)
  • Melamine (MF)
  • Polyester (UP)
  • Epoxy (EPK)


Main Properties

  • High distortion temperature, not softened any more by heating once set,
  • Hardness is high generally
  • Molded by transfer molding and compression molding in many case


Main Uses

Electronic parts such us printer parts, camera part, refrigerator parts, television parts, camera parts, beside that structural parts mostly used this plastic type such us, frames printer, chassis and outer parts, in printer it is used in Ink jet printer head parts.


Thermoplastic

This type of plastic can divide into 2 structure of plastic they are :

  1. Crystalline structure
  2. Amorphous structure


Crystalline structure
This type of plastic that have crystalline structure include :

  • Polyethylene (PE)
  • Polypropylene (PP)
  • Polyamide (PA)
  • Polyacetal (POM)
  • Polyethylene teraphthalate (PET)
  • Polypropylene sulfide (PPS)


Main Properties

  • Has chemical resistance
  • Adhesion and paintability are low
  • Molding shrinkage is large so it is difficult to secure precise dimension
  • Warp and sink are made easily and mold is not copied well
  • Transparency is low


Main uses

  • Tableware and containers
  • Electronic parts that not need very precise dimension
  • Sliding parts, machine parts
  • Mechanism parts, connector coil bobbin
  • Same frame and chassis


Amorphous structure
This type of plastic that have amorphous structure include

  • Polystyrene (PS)
  • ABS
  • Acrylic resin (PMMA)
  • Polysulfone (PSF)
  • Polyvinyl chloride (PVC)
  • Polysulfone (PSF)
  • Polyurethane (PU)


Main Properties

  • Chemical resistance is not high
  • Adhesion and paint ability are high
  • In Molding shrinkage is little so precision can be obtained more easily than crystalline plastics.
  • Have high transparency

Main uses

  • Miscellaneous goods and containers
  • Electronic parts that need precise dimension
  • Housing glasses
  • Lenses and glasses
  • Camera parts
  • Watch band, soles
  • Medical device parts
  • Pipe and chassis that need transparency