Quick Answer:
Short Answer
Fork sensors can be hit by expanding webs. Roll-2-Roll® Sensors mount outside web path - no collision risk.
Fork sensor collision occurs when the web width increases unexpectedly (due to material variation, tension changes, or process adjustments) and the expanding web physically contacts the fork-style sensor assembly. This causes web damage (scratches, contamination), sensor damage (misalignment or breakage), emergency line stops, and material waste. Roll-2-Roll® Sensors avoids this entirely by using wide one-sided sensor mounted outside the web path—even when web width increases dramatically, there is no physical sensor in the way.