This is an uneven winding of the paper reel at the mill. If the roll was at the end of the jumbo reel, the web was winding in an out during the process. Both the lateral movement of the sheet or core can cause this.
Problems that this causes on a web offset press:
- Automatic lateral adjustments of the web guides will not function properly as the edge of the paper changes.
- The edge of the paper will wander to offset blanket's inked edges of the paper that are out of print. This can cause web breaks.
- The finished product will have uneven edges of the newspaper or magazine.
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