Opaque White to Clear Goal: Scrap and cleaning cost reduction

“I said before the cleanup that nothing would be able to clean this stubborn opaque white. EasyPurge got the job done reducing scrap by half.”
Plant Manager


Machine: Husky Hypet 300
Extruder Diameter: 120 mm
Mould: 48 x 44.0grs
Material: PET
Colour: Opaque White 10% T. Oxide to Clear
Factory Location: Spain

Colour change current standings:
  • High scrap rates during colour changes when using purging compound in pellets.
  • Long downtimes due to the presence of colour streaks.
Normal results using virgin material:

Time: 1:10 Hour
Scrap: 450 Kgs
Purging Compound consumed: 25 Kgs

Using EasyPurge Purging Compound:

Time: 30 Minutes
Scrap: 200 Kgs
Purging Compound used: 1950ml

  1. Seven shots were done injecting Virgin PET resin to remove the bulk of the colour contamination.
  2. The dosing of Easypurge started automatically through the premixer using the automatic dosing device while the machine was still injecting preforms.
  3. Both screw and hot runners were cleaned using Easypurge at 1.5%.
  4. The Easypurge Automatic Purging System stopped adding purging compound.
  5. The cleaning colour changes procedure was finished using virgin material to remove the rest of the purging compound leaving the hot runners clear of colour contamination.