Web Inspection
Line Scan Lighting for Film Wrinkle Inspection
For film and web wrinkle inspection, lighting direction matters as much as output. Select a line-scan configuration by comparing wrinkle direction, film finish, scan width, speed, exposure, working distance, and the thermal duty cycle that the station can sustain.
FocusDirect answer: start with defect directionEvidenceSelection inputsControlProduction risks to validate
Direct answer: start with defect direction
- Wrinkles and scratches can disappear when their direction aligns with the illumination response, so test more than one directional arrangement.
- Define scan width, exposure, speed, working distance, camera sensitivity, and thermal limits together.
Selection inputs
- Film type, coating, transparency, gloss, web tension, defect direction, and representative good/bad material.
- Camera line rate, exposure, transport speed, encoder or trigger source, and fixture envelope.
Production risks to validate
- Contrast drift from film lot, coating, web tension, or reflective changes.
- Insufficient exposure margin, non-uniformity across width, or impractical thermal and mounting limits.
Line Scan Lighting for Film Wrinkle Inspection questions
Why can a wrinkle disappear in a line-scan image?
The illumination direction may align with the wrinkle, the angle may not create enough response, or exposure and reflection conditions may reduce contrast. Compare orientation and angle on representative moving material.
What information is required for a line-scan lighting review?
Provide film material and finish, defect examples, scan width, camera and lens, line speed, exposure, working distance, trigger method, and space or thermal limits.