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.
Alternative terms: Thin Spot, Water drop
Appearance: Bright area with soft edge, sometimes with periodic occurrence, often lengthwise.
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.
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.