Look at a letter, fine rule and solid printed area at the same magnification. A smear often shows a drawn-out tail, a blurred transition or ink spread in a direction. A doubled edge more often shows a second recognizable contour displaced from the intended one. Look for the same displacement at several corners of the artwork. A recognizable offset across several features supports the interpretation of a repeated or misregistered impression.

Check which features move together

Compare the mark with the approved artwork and a good sample. In a multicolor design, identify which color formed the extra contour. An offset in one color relative to another calls for a different investigation from two contours in the same ink. On curved parts, rotate the sample under a fixed light and keep the magnification and viewing angle consistent so reflections do not resemble a pale outline.

Use process history to locate the step

Preserve an untouched part. Compare samples collected just after printing and after handling or curing, where those samples are available. A mark visible immediately after print can prompt checks on part hold, screen motion or registration. A mark appearing after contact later in the process points to a different part of the route. Record the direction and offset alongside the production stage before attributing the defect to a particular machine setting.

Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information: sambound.com.

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