Needle Perforation
Making holes mechanically (by piercing or punching) in order to incorporate a number or motif into a document. Serial numbers are perforated in a regular, matrix-type arrangement of circular, equal-sized holes always pierced in the same direction. Needle perforation is recognisable by the ridges ("burr") that can be felt on the back of the substrate.
Source : Click Here
Making holes mechanically (by piercing or punching) in order to incorporate a number or motif into a document. Serial numbers are perforated in a regular, matrix-type arrangement of circular, equal-sized holes always pierced in the same direction. Needle perforation is recognisable by the ridges ("burr") that can be felt on the back of the substrate.
Source : Click Here
Comments
Post a Comment