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PL-P

PET Preform Stress Viewer

The PL-P Polarization Light for Preform identifies weaknesses and stress points in PET preforms, revealing defects through a colored birefringence pattern under polarized light. It highlights the molecular strain occurring during injection moulding, with a viewing area of 330x150mm (350x350mm optional).

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PET Preform Stress Viewer

Many of the defects found in PET container preforms can be detected by using the PL-P. Preforms viewed in polarized light exhibit a colored birefringence pattern, a result of the polymer flow lines (molecular orientational strain) produced during the injection moulding process.

The colored pattern observed with the preform held at 45° to the polarizing axis is known as an isochromatic fringe, indicating the amount of birefringence. When the preform is held parallel to the polarizing axis, a black isoclinic can be seen indicating the direction of the molecular orientational strain. By correctly interpreting these flow patterns, many preform defects can be detected.

Key Features

  • Detects weaknesses and stress points via colored birefringence pattern.
  • Light source: 2 x 18 watt fluorescent lamps.
  • Power supply: 110 or 220 volts.
  • Viewing area: 330 x 150mm (350 x 350mm optional).
  • Available in multiple models to suit various inspection needs.

Applications

Essential for PET preform manufacturers needing to identify moulding-induced weaknesses and stress points before preforms are blown into finished bottles.

Talk to the Techotrix team to find out whether the PL-P is the right stress viewer for your preform quality control.

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