Plastic Processing Data

Processing means setting up different parameters to produce a part which has all dimensions and tolerances per drawing and also meets the quality requirements. Process needs to be optimized to give us a part with minimum cycle time and best quality. First thing to start will be material properties (Physical, Mechanical and Thermal) which are provided by material supplier. These data can be used as guidelines for setting parameters on injection machine.

Material Properties

  • Material 
  • Melt Temperature (  or ° F)
  • Mold Shrinkage  (%)
  • Specific Gravity  (unitless)
  • Coefficient of Thermal Expansion, (in/in)/°F
  • Drying Temp (  or ° F)
  • Water Absorption % (24 hr@ 73 °F)
  • Heat Deflection Temp @264 psi
  • Specific Heat btu/lb/°F
  • Injection Pressure on Material (PSI)
  • Back Pressure on Material (PSI)
  • Melt Flow Index (g/10 min)

Process Setup Sheet

  • Press tonnage (tons)
  • Barrel Zones Temperature (°F)
  • Screw RPM
  • Gates Temperature  (℃  or °F)
  • Nozzle Temperature (°F)
  • Mold Zones Temperature (°F)
  • Clamp Force (ton)
  • Filling Time (sec)
  • Hold Pressure 
  • Cooling Time (sec) 
  • Injection Pressure (PSI)
  • Cushion (in)
  • Injection Speed (in/sec or mm/sec)
  • Ejector speed (in/sec or mm/sec)

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