Perforation of food packaging is often required for ease of removal. In this particular application, filled ice cream cones were packaged in a material that is made of 70-80 μm thick paper, coated with an approximately 20 μm thick layer of aluminium; and to facilitate opening of the package, the cone manufacturer needed to perforate through the paper layer while leaving the aluminium layer totally untouched. Preserving the aluminium layer was necessary to maintain the mechanical stability of the package and avoid compromising its function as a barrier to entry for moisture and oxygen.
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