Web and Paper Inspection FAQs

Web inspection is continuous monitoring of moving material (paper, film, foil, textiles) to detect defects in real time, typically using:

• Line-scan cameras
• Controlled illumination
• Encoders for position tracking
• Defect mapping and reporting for downstream actions

Common defects include:

• Holes, tears, edge defects
• Streaks, bands, blobs, spots
• Coating voids, inclusions, contamination
• Wrinkles, creases
• Print defects and registration errors

Systems can be tuned to classify defects by severity and type.

Yes, particularly when using:

• Registration tools for alignment and repeat checks
• Density/contrast monitoring for banding and fade
• Controlled lighting to keep color metrics stable

Some applications require calibration to maintain acc

Strobe lighting uses very short flashes synchronized to motion so the camera captures a crisp image without blur. This is especially valuable when:

• Web speed changes frequently
• Defects are small and require sharp imaging

• Line scan captures one line of pixels repeatedly to build an image as the web moves—ideal for high speed and continuous material.
• Area scan captures full frames—often used for discrete products or lower-speed web segments.

Most true web inspection systems use line scan for performance and coverage.

Reducing false calls often involves:

• Lighting that minimizes texture contrast
• Filters that ignore repeating fiber patterns
• Thresholds built from representative samples across lots
• AI classification when normal texture variation is extreme

The best setups include a process for periodically reviewing false reject images.