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PC - HD (Polyethylene - High Density)

Also Known As

  • Hostalen
  • Lacqtene HD
  • Lupolen
  • Marlex
  • Rigidex
  • Stamylan HD
  • Vestolen A

Typical Machine Settings: Subject To Polymer Grade

Nozzle

Front

Centre

Rear

Barrel Temperature

205 - 285oC

205 - 285oC

205 - 285oC

175 - 205oC

Melt Temperature

205 - 285oC

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

Hot Runner Temperature

205 - 285oC

Mould Temperature

5 - 35oC

Injection Rate

Fast

Specific Injection Pressure

700 - 1400 Bar (10,000 - 20,000psi)

Screw Back Pressure

3.5 - 13.5 Bar (50 - 200psi)

Screw Speed

Fast

Processing Features

Structure

Semi-Crystalline

Specific Gravity

0.96

Viscosity

Medium

Needs medium runners.

Shear Rate Susceptibility

High

Needs medium gates to reduce pressure.

Temperature Window

Wide

Residence Time

Long

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

The mcahine and mould may be shut-down normally, without purging the Polyethylene from either the barrel or the hot runner.