Geometry
Perforation
A perforation is a series of cuts separated by uncut bridges that creates a controlled tear or separation line.
What it means in packaging
The cut lengths and remaining bridges affect how easily the material tears. A dashed line drawn for appearance does not necessarily define a usable perforation for a cutter. Its production meaning must be assigned explicitly.
A practical example
A display carton can use a perforated strip so the shop removes its upper section after delivery.
What to check
Test opening force and accidental tearing with the actual material; a screen preview cannot establish either.