Coreless tissue rolls and method of making the same
View Patent ↗Coreless tissue rolls can be produced without having to use an adhesive to form a hollow center. Instead, moisture can be used to promote light hydrogen bonding between the layers of the tissue web that line the hollow center. The hydrogen bonding provides sufficient structure to maintain the shape of the hollow center without rendering the tissue web surrounding the passageway unusable. Passageways can also be formed in accordance with the present disclosure that are substantially circular so that the rolls will easily spin on a spindle. In an alternative embodiment, moisture is not used in constructing the wound tissue roll.
1. A process for producing a coreless tissue roll comprising:
wetting a leading edge or near a leading edge of a tissue sheet with an aqueous solution, the aqueous solution being adhesive free;
contacting the leading edge of the tissue sheet with a mandrel;
rotating the mandrel in order to wind the tissue sheet into a roll, the roll having an exterior surface as it is wound;
cutting the tissue sheet to complete the roll; and
stripping the finished roll from the mandrel, the finished roll defining an axially passageway that extends from a first end of the roll to a second and opposite end of the roll in a direction perpendicular to the length of the tissue sheet, the passageway being lined only by the tissue sheet;
wherein the tension is maintained on the tissue sheet during formation on the roll in an amount of 0.2 lb per linear inch or less.
2. A process as defined in claim 1 , wherein, in addition to rotating the mandrel, a moving belt engages the exterior surface of the roll during winding such that the roll is wound using a combination of center winding and surface winding.
3. A method as defined in claim 2 , wherein the tissue sheet is conveyed on the belt for initial contact with the mandrel, the mandrel being accelerated to a rotational speed that is substantially equal to a speed at which the tissue sheet is moving on the belt prior to contact with the tissue sheet.
4. A process as defined in claim 1 , wherein a tension is maintained on the tissue sheet during formation of the roll in an amount less than about 0.1 lb per linear inch.
5. A process as defined in claim 1 , wherein the tissue sheet is cut to complete the roll at a tension of no greater than about 0.2 lb per linear inch.
6. A process as defined in claim 1 , wherein the tissue sheet comprises a bath tissue and has a basis weight of from about 8 gsm to about 45 gsm, the tissue sheet having a bulk of at least 3 cc/g and containing at least about 80 percent by weight pulp fibers, and wherein the tissue sheet has a geometric mean tensile strength of less than about 1000.
7. A process as defined in claim 1 , wherein the tissue sheet comprises a paper towel and has a basis weight of from about 25 gam to about 80 gsm, the tissue sheet having a bulk of at least 3 cc/g and containing at least about 80 percent by weight pulp fibers.
8. A process as defined in claim 1 , wherein the mandrel applies a suction force against the tissue sheet during winding.
9. A process as defined in claim 1 , wherein the axial passageway has a substantially circular cross-sectional shape.
10. A process as defined in claim 1 , wherein the axial passageway has a diameter of from about 0.5 inches to about 3 inches.
11. A process as defined in claim 1 , wherein the axial passageway has a diameter of from about 1 inch to about 3 inches.
12. A process as defined in claim 1 , wherein the mandrel comprises a plurality of openings and wherein a suction force is applied to the mandrel during contact with the leading edge of the tissue sheet.