Durable and dispersible creped mutli-ply tissue
Disclosed are multi-ply tissue products comprising a non-crosslinked binder that are durable and dispersible. The products generally have a Slosh time less than 2 minutes, such as less than about 60 seconds, such as less than about 45 seconds. Surprisingly, the foregoing Slosh times are achieved despite the tissue products having relatively high cross-machine direction (CD) wet tensile strength, such as greater than about 100 g/3″. Typically, increasing wet tensile strength, particularly wet CD tensile strength, negatively effects dispersability and increases Slosh time. Despite this trend, the present invention surprisingly provides a tissue product having a relatively high degree of wet strength and good dispersability.
1. A method of manufacturing a rolled tissue product comprising the steps of:
a. providing a first tissue web;
b. providing a heated creping surface;
c. applying a non-crosslinked vinyl acetate-ethylene polymer to the first tissue web;
d. adhering the first tissue web to the heated creping surface;
e. removing the adhered first tissue web from the heated creping surface to yield a creped tissue ply;
f. plying two or more creped tissue plies together to form a multi-ply tissue product, wherein the multi-ply tissue product has a geometric mean tensile strength (GMT) greater than about 700 g/3″, a Durability Index of about 10.0 or greater and a Slosh time less than about 2 minutes.
2. The method of claim 1 further comprising the step of applying a softening composition to the creped tissue ply or the multi-ply tissue product, wherein the softening composition is selected from the group consisting of a polyhydroxy compound having a molecular weight of at least about 1,000 g/mol, a diamidoamine quaternary compound, an ester quaternary compound, an alkoxy alkyl quaternary compound, a benzyl quaternary compound, an alkyl quaternary compound, an imidazolinium quaternary compounds, a polysiloxane and glycerin.
3. The method of claim 1 further comprising the step of applying an anti-blocking agent to the heated creping surface, wherein the anti-blocking agent is selected, from the group consisting of surfactants, silicones, waxes and polysaccharides.
4. The method of claim 1 further comprising the step of embossing the creped tissue ply.
5. The method of claim 1 further comprising the step of spirally winding the multi-ply tissue product around a core to yield a rolled tissue product.
6. The method of claim 1 wherein the first tissue web consists essentially of wood pulp fibers.
7. The method of claim 1 wherein the first tissue web has a basis weight ranging from about 10 to about 30 grams per square meter (gsm).
8. The method of claim 1 wherein the multi-ply tissue product has a GMT from about 700 to about 1,700 g/3″.
9. The method of claim 1 wherein the multi-ply tissue product has a wet CD tensile from about 110 to about 160 g/3″.
10. The method of claim 1 wherein the multi-ply tissue product has a Wet/Dry Ratio from about 0.10 to about 0.15.
11. The method of claim 1 wherein the multi-ply tissue product has a Durability Index of about 15.0 or greater.
12. The method of claim 1 wherein the multi-ply tissue product has a Stiffness Index from about 4.0 to about 6.0.
13. The method of claim 1 wherein the multi-ply tissue product has a Slosh time from about 15 to about 45 seconds and a wet burst strength from about 150 to about 200 gf.
14. The method of claim 1 wherein the step of removing the adhered first tissue web from the heated creping surface to yield a creped tissue ply is carried out by a contacting the adhered tissue web with a creping blade.
15. The method of claim 1 wherein the non-crosslinked vinyl acetate-ethylene polymer is applied to the first tissue web in a pattern.
16. The method of claim 15 wherein the pattern is a continuous pattern.
17. The method of claim 16 wherein the density of discrete dots ranges from about 25 to about 35 dots per square inch (25.4 mm 2 ) of tissue web surface area.
18. The method of claim 15 wherein the pattern comprises a plurality of discrete dots.
19. The method of claim 15 wherein the pattern is a continuous reticulated pattern.
20. The method of claim 1 wherein the non-crosslinked vinyl acetate-ethylene polymer is applied to the first tissue web by gravure printing, spraying, flexographic printing or ink jet printing.