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PA 66 (Nylon 66)

Also Known As

  • Akulon
  • Durethen A
  • Grilon
  • Maranyl
  • Orgamid
  • Technyl
  • Ultramid A
  • Vydyne
  • Zytel

Typical Machine Settings: Subject To Polymer Grade

Nozzle

Front

Centre

Rear

Barrel Temperature

285 - 300oC

270 - 280oC

275 - 280oC

285 - 300oC

Melt Temperature

295 - 310oC

Must be measured with a pyrometer by taking an airshot through the injection machine nozzle.

Hot Runner Temperature

295 - 310oC

Mould Temperature

65 - 120oC

Run at upper end of range for best surface finish.

Injection Rate

Fast

Specific Injection Pressure

350 - 1400 Bar (5,000 - 20,000psi)

Screw Back Pressure

3.5 Bar (50psi)

Screw Speed

Slow

Processing Features

Structure

Semi-Crystalline

Specific Gravity

1.15

Viscosity

Medium

Shear Rate Susceptibility

Low

Temperature Window

Narrow

Needs accurate & stable control

Residence Time

Short

Aim for '1-shot' residence time

Start-Up Precedure
  • Ensure all heaters are thoroughly baked dry - do not rely on brief ‘soft start’ systems to do this.
  • Fast Heat controllers automatically and safely bakeout wet heaters - ask for details.
  • Turn on water lines to stabilise tool and manifold temperatures.
  • Turn on manifold control zone(s) and allow to warm up until measured value is within 10oC of setpoint.
  • Now turn on tip zones and allow to settle at setpoint for 5 - 10 minutes before starting production.
  • Take an airshot from the machine barrel and check that the melt temperature is correct.
  • Start moulding parts on a semi-automatic cycle until suitable machine settings are established.
  • Avoid lengthy delays between cycles during this setting procedure.
  • Switch to automatic cycle when parts are being produced, and fine tune the machine settings

Shut-Down Precedure
  • DO NOT shut down with Nylon in the machine barrel of hot runner system.
  • Purge the barrel thoroughly with glass-filled HDPe or other recommend polymer.
  • Now start moulding parts in the purging material until all drops are clear of Nylon.
  • DO NOT attempt to purge through an open mould, or melt leakage my result.
  • Shut down the machine & mould when ALL of the Nylon has been cleaned out.