Patent ID: 8512836

Claim:
A packaging material comprising a plurality of magnetisable portions printed thereon comprising at least one spot per package to be formed from the packaging material, the package possessing a bottom and a top, wherein at least one of the magnetisable portions provides a magnetic mark carrying a magnetic field pattern, wherein the magnetic field pattern comprises a first magnetic field peak having a first polarity and a second magnetic field peak having a second opposite polarity, the packaging material having a longitudinal direction defined in parallel with a flange or joint connecting the bottom and the top of the package, a transversal direction perpendicular to the longitudinal direction, and an imaginary line between a midpoint of the first peak and the second peak of the magnetic field pattern, wherein the peaks of the magnetic pattern have a distribution forming a substantially constant magnetic field strength along a width of the magnetic pattern in a direction perpendicular to the imaginary line, and forming a strongly decreasing magnetic field strength outside the width of the magnetic pattern in the direction perpendicular to the imaginary line, and wherein the magnetic field pattern is arranged such that the angle between the imaginary line and the longitudinal direction is between −10 and 10 degrees.