Tissue machine parent roll having variable intrinsic sheet dryness
View Patent ↗The intrinsic tissue sheet properties of tissue sheets wound into a parent roll during manufacturing can be purposely varied in order to provide a z-directional gradient within the parent roll. For example, the moisture content of the tissue sheet can be made lower in the core region of the parent roll and greater in the outer region of the parent roll. Such gradients can ultimately provide more uniformity of the intrinsic property within the final tissue product.
1. A parent roll comprising a tissue web having a machine direction moisture profile wound around a core thereby forming a core area and an outer area wherein the average sheet moisture in the core region is from about 0.5 to about 1.5 weight percent and the average sheet moisture in the outer region is from about 2 to about 4 weight percent, wherein the average sheet moisture is measured upon formation of the parent roll.
2. The parent roll of claim 1 wherein the average sheet moisture in the core region is from about 0.5 to about 1 weight percent and the average sheet moisture in the outer region is from about 2 to about 3 weight percent.
3. The parent roll of claim 1 wherein the sheet caliper in the core region is equal to or greater than the sheet caliper in the outer region.
4. A parent roll having a z-directional moisture gradient, the parent roll comprising a tissue web having a machine direction moisture profile wound around a core thereby forming a core region spanning from about 0 to about 30 inches from the core, a transitional region spanning from about 30 to about 50 inches from the core and an outer region spanning from about 50 to about 150 inches from the core, wherein the average sheet moisture in the core region is from about 0.5 to about 1.5 weight percent and the average sheet moisture in the outer region is from about 2 to about 4 weight percent, wherein the average sheet moisture is measured upon formation of the parent roll.
5. The parent roll of claim 4 wherein the average sheet moisture in the core region is from about 0.5 to about 1 weight percent and the average sheet moisture in the outer region is from about 2 to about 3 weight percent.