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PSU (Polysulphone)

Also Known As

  • Mindel
  • Udel
  • Ultrason S

Typical Machine Settings: Subject To Polymer Grade

Nozzle

Front

Centre

Rear

Barrel Temperature

340 - 390oC

340 - 390oC

320 - 370oC

300 - 350oC

Melt Temperature

340 - 390oC

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

Hot Runner Temperature

340 - 390oC

Mould Temperature

100 - 175oC

Run at upper end of range for best surface finish.

Injection Rate

Moderate

Specific Injection Pressure

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

Screw Back Pressure

1.7 - 5.0 Bar (25 - 75psi)

Screw Speed

Slow

Processing Features

Structure

Amorphous

Specific Gravity

1.24

Viscosity

High

Medium to large runners can be used.

Shear Rate Susceptibility

Medium

Medium gates can be used.

Temperature Window

Small

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