Torus B306 Polarised Light Box

Reliable Visual Inspection for PET and Clear Plastic Preforms

The Torus B306 Polarised Light Box supports production operators in visually inspecting plastic preforms for internal defects and material inconsistencies.

Using polarised light filters and long-life LED backlighting, the B306 reveals stress concentrations, non-uniform material flow, and issues caused by moisture or degraded resin. The inspection is carried out manually, allowing users to rotate and tilt the preform under light to spot defects such as bubbles, cold or hot material, slow fill, crystallisation, and more.

This intuitive inspection tool is developed by Torus – our specialist testing brand for plastic preform inspection. Whether you’re dealing with PET, PP, or Tritan, the B306 provides an easy-to-use, shop-floor-ready solution for ensuring quality before bottles are blow-moulded.

Designed for Efficiency – Small Footprint, Big Impact

Compact and efficient, the B306 fits seamlessly into both laboratory and production environments. Its small footprint allows it to be easily installed on workbenches or near the line without disrupting workflow—making it ideal for manufacturers looking to optimise space while maintaining inspection accuracy.

The inspection process is entirely manual, allowing users to rotate and tilt preforms under polarised light for close visual checks of bubbles, stress points, crystallisation, and other issues caused by inconsistent resin flow.

Why Polarised Light Testing Matters

In preform production, invisible defects can have serious downstream consequences — from structural weaknesses in bottles to costly machine downtime.

By using polarised light, operators can identify problems at the earliest stage. This helps protect the integrity of your containers, improves line efficiency, and supports sustainable manufacturing — especially when working with recycled materials (rPET).

How to Use the B306 Polarised Light Box

1. Place your clear plastic preform into the viewing area.
2. Use the adjustable screen angle to optimise visibility.
3. Rotate and tilt the preform to inspect it from different orientations.
4. Observe internal stress lines, flow inconsistencies, or other visible defects under polarised light.

The entire process is manual, allowing experienced operators to rely on visual judgement and quickly compare multiple samples using the wide viewing area.

Explore More Plastic Preform Inspection Instruments

The Torus B306 Polarised Light Box is part of a broader portfolio of inspection tools designed to meet the evolving quality control needs of plastic preform manufacturers. For enhanced dimensional analysis and semi-automated defect detection, the Torus B301 Semi-Automatic Optical Inspection Gauge offers precise, repeatable imaging for detailed assessment. When full automation is required, the Torus B305 Automatic Preform Inspection System delivers high-speed, 360-degree inspection with minimal operator involvement.