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Defect Catalog Extract


Alternative terms: Sludge, slime hole, Pinhole

Appearance: Diverse in shape, sometimes with a dark area, where the paper is folded. Circular in shape and very small.

Bright Spot

Alternative terms: Thin Spot, Water drop

Appearance: Bright area with soft edge, sometimes with periodic occurrence, often lengthwise.



Dark Spot

Alternative terms: Dirt, sludge, Scrap, debris

Appearance: Small dark spot with variable shape. Sometimes in bursts across the whole web; dark spot with variable shape and high contrast.

Edge Crack

Appearance: Crack, sometimes combined with a wrinkle mostly ending at the edge. The wrinkle is often sickle-shaped.



Appearance: Dark with good contrast and sharp edges, up to three layers of paper, often running inwards from the paper edge.


Appearance: Oriented in machine direction, not always sharp edges, length depending on coating device. Width may vary considerably.




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Customer Examples

  • Abitibi
  • Atlantic Packaging
  • Bowater
  • Guangzhou Paper
  • Irving Paper
  • Madison Paper
  • Malaysian Newsprint
  • Norske Skog
  • Palm Papier
  • Pan Asia
  • Stora Enso
  • UPM-Kymmene