Patent ID: 8097312

Claim:
A roll of material used for the production of paper products that include a transparent window within a surrounding non-transparent area, the material being substantially planar and having a rectangular shape when laid flat and possessing the characteristic that when it is rolled up along its length the resulting roll of material has a substantially circular-cylindrical shape, the material comprising: a) a paper substrate including a plurality of open areas formed such that each open area has a perimeter that is contacted along its entirety by the paper substrate; and; b) a multiple of windows that are substantially planar when laid flat; c) wherein the multiple of windows are arranged to cover the respective open areas and wherein the multiple of windows extend over the perimeter of each open area so as to create a plurality of covered areas; d) wherein the paper substrate is modified such that when the material is rolled up along its length the resulting roll of material has a substantially circular cross-section; and e) wherein the combined thickness of the transparent window and paper at the plurality of covered areas is uniform to the thickness of the paper at the surrounding non-covered areas, such that the roll of material can be unrolled at high speeds without the uneven and erratic unwinding associated with unrolling asymmetrical rolls.