Outer packaging for kitchen roll, toilet paper etc. is usually made from PE film. This is very elastic and is hard to open without slits. Lasers are used to make cuts with any spacing and length following a predefined contour. So the packaging can easily be opened for removal of the individual products.
PP film, for example, is used for the outer packaging of tissues. Thanks to the slits and precise coordination of the cut-to-land ratio, after tearing along the lines, consumers are left with an opening that enables them to remove the little packs of tissues individually.