Interfolded stack of sheet material
View Patent ↗By reducing the overlap distance O of the interfolded sheets in the upper layer of a stack of interfolded sheets, sheet tears and/or multiple dispensing can be avoided for the initial sheets dispensed. By increasing the overlap distance O of the interfolded sheets in the lower layer of a stack of interfolded sheets, fallback of the subsequent sheets can be avoided. To maximize the number of sheets that can be placed into the same sized dispenser, the folded width of all sheets in the stack should be substantially the same. The interfolded stack is especially useful in an upright dispenser to improve sheet dispensing, but can also be utilized in a flat dispenser.
1. A product comprising:
an interfolded stack containing a plurality of individual interleaved sheets folded from a sheet material;
each of the sheets having substantially the same overall folded width and having an overlap distance O representing the distance a preceding sheet is in interleaved contact with a subsequent sheet;
the stack having an upper layer and a lower layer; and
wherein the overlap distance O is less for the sheets in the upper layer than for the sheets in the lower layer and wherein the overlap distance for the sheets in the upper layer progressively increases from an initial overlap distance O i to a final overlap distance O f .
2. The product of claim 1 wherein the upper layer comprises Z-folded sheets and the lower layer comprises V-folded sheets.
3. The product of claim 1 wherein the upper layer comprises C-folded sheets and the lower layer comprises V-folded sheets.
4. The product of claim 1 wherein the sheets in the upper layer have an initial overlap distance O i and O i between about 15% to about 45% of the unfolded sheet width.
5. The product of claims 1 , 2 , or 3 wherein the sheets in the upper layer have an initial overlap distance O i and O i is between about 20% to about 35% of the unfolded sheet width.
6. The product of claim 1 wherein the sheets in the lower layer have a final overlap distance O f and O f is between about 35% to about 50% of the unfolded sheet width.
7. The product of claim 5 wherein the sheets in the lower layer have a final overlap distance O f and O f is between about 45% to about 50% of the unfolded sheet width.
8. The product of claim 1 , 2 , or 3 wherein the increase in overlap distance occurs in about 20 sheets or less.
9. The product of claims 1 , 2 , or 3 further comprising the stack folded about an offset transverse fold axis into a J-shaped folded clip; the folded clip including a folded end and a longitudinal fold axis; the folded clip placed into an upright dispenser having a top, a bottom, a sidewall, and a dispensing opening in the top with the upper layer positioned in the vicinity of the dispensing opening; and wherein the longitudinal fold axis of the folded clip intersects the dispenser's sidewall.
10. The product of claims 1 , 2 , or 3 further comprising the stack folded about a transverse fold axis into a U-shaped folded clip; the folded clip including a folded end and a longitudinal fold axis; the folded clip placed into an upright dispenser having a top, a bottom, a sidewall, and a dispensing opening in the top with the upper layer positioned in the vicinity of the dispensing opening; and wherein the longitudinal fold axis of the folded clip intersects the dispenser's top.
11. The product of claim 1 wherein the sheet material comprises wet sheet material.
12. The product of claim 1 wherein the sheet material comprises tissue paper.
13. The product of claim 1 wherein the first sheet in the upper layer comprises a staler sheet having a folded free end.
14. The product of claim 11 wherein the starter sheet comprises a J-shape having a first panel folded under a second panel and also having the first and second panels folded over a third panel.