Banded cigarette wrapper with opened-area bands

Patent metadata

Field	Value
Publication number	US-12075818-B2
Application number	US-202016867840-A
Country	US
Kind code	B2
Filing date	May 6, 2020
Priority date	May 16, 2012
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A wrapper of a smoking article comprising a base web and banded regions comprising a leading edge, a trailing edge and a plurality of add-on material-free openings between said leading edge and said trailing edge. The add-on material-free openings establish a predetermined, nominal opened-area within said banded regions to control diffusivity. The add-on material can be applied by a gravure roller comprising a surface region with cells, cell-free areas and a chevron shape.

First claim

We claim:

1. A method of manufacturing wrapper material suitable for forming wrappers of smoking articles, the method comprising
maintaining an aqueous starch solution at a temperature sufficient to provide the aqueous starch solution with a viscosity of less than about 200 cP;
feeding a base web along a feed path; and
printing the aqueous starch solution onto the base web to form a plurality of banded regions including the aqueous starch solution, each of the banded regions including
a leading edge,
a trailing edge, and
openings between the leading edge and the trailing edge free of the aqueous starch solution, the openings establishing a desired, nominal area free of the aqueous starch solution within each banded region of the plurality of banded regions in the range of about 4% to about 9% of a total nominal area of an respective banded region of the plurality of banded regions, and the openings having a pattern that includes linear rows, the openings defining one or more square shaped pillars, one or more triangular shaped pillars, one or more rectangular shaped pillars, or any combination thereof in the linear rows.

2. The method of claim 1 , wherein the pattern further includes linear rows of dot openings, the dot openings having a circular shape, a square shape, a diamond shape, a rectangular shape, an oval shape, or any combination thereof.

3. The method of claim 2 , wherein the linear rows of the dot openings include a first row and a second row, the first row including a first plurality of openings, the second row including a second plurality of openings, a center of each opening of the first plurality of openings is located about 1.5 mm to about 2.0 mm diagonally from an adjacent opening of the second plurality of openings in the second row.

4. The method of claim 1 , wherein the openings further define a lattice structure.

5. The method of claim 1 , wherein the openings include about 6% to about 8% of the total nominal area of the respective banded region.

6. The method of claim 1 , wherein the printing includes gravure printing with a gravure roller, the gravure roller having cells disposed on an outer surface thereof where areas without cells correspond to the openings.

7. The method of claim 1 , wherein the aqueous starch solution is applied as a single layer.

8. The method of claim 1 , wherein the aqueous starch solution includes an anti-wrinkling agent, calcium carbonate, and starch.

9. The method of claim 8 , wherein the anti-wrinkling agent includes propylene glycol, 1,2 propylene glycol, glycerin, or any combination thereof.

10. The method of claim 1 , wherein a center of a first row is about 5.0 mm to about 6.0 mm from a center of a second row.

11. The method of claim 1 , wherein each of the banded regions is about 5.0 mm to about 9 mm in width.

12. The method of claim 1 , wherein the aqueous starch solution includes starch and propylene glycol, and the method further includes adding calcium carbonate to the aqueous starch solution prior to printing.

13. The method of claim 12 , wherein the base web has a permeability of greater than about 20 CORESTA.

14. The method of claim 13 , wherein the base web has a permeability of less than about 100 CORESTA.

15. The method of claim 1 , wherein each of the banded regions exhibits a diffusivity value in the range of about 0.12 cm/sec to about 0.15 cm/sec.

Assignees

• Altria Client Services Llc

Inventors

• Sherwood Timothy S
• Kikkert Robert
• Smith Robert
• Rostami Ali A
• Karles Georgios

Classifications

• A24D1/025 Primary

  the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity · CPC title