Выражение встречается в следующем контексте:
5.4 Manufacturing defects
Panels conforming to this standard shall not contain any of the following manufacturing defects: open joints (e.g. core gaps, overlaps and pleats, blisters, hollows, bumps and imprints), roughness (other than that due to the irregular structure of the wood), sanding through, foreign particles, defects in the edges of panels (e.g. due to sanding, sawing, missing wood).

Заранее спасибо