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PVC-P (Flexible Poly-Vinyl Chloride)

Also Known As

  • Vinoflex

Typical Machine Settings: Subject To Polymer Grade

Nozzle

Front

Centre

Rear

Barrel Temperature

170 - 195oC

170 - 190oC

160 - 180oC

150 - 170oC

Melt Temperature

175 - 195oC

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

Hot Runner Temperature

175 - 195oC

Mould Temperature

10 - 45oC

Injection Rate

Moderate To Fast

Specific Injection Pressure

700 - 1250 Bar (10,000 - 18,000psi)

Screw Back Pressure

3.5 Bar (50psi)

Screw Speed

50 rpm

Processing Features

Structure

Amorphous

Specific Gravity

1.30

Viscosity

Low

Small runners can be used.

Shear Rate Susceptibility

Low

Small gates can be used.

Temperature Window

Medium

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