Smoking product wrapping material having improved smouldering properties

Abstract

Disclosed is a smoking article wrapping material comprising a base wrapping material to which has been applied, at least in discrete zones, a composition comprising a mechanically fragmented, chemically crosslinked polysaccharide having a particle size (weighted average) in the range from 1 to 1000 m for the dry product; a process for production thereof; and a smoking article comprising the smoking article wrapping material described.

Claims

1. A process for the production of smoking article wrapping materials, comprising applying a composition to at least discrete zones of a base smoking article wrapping material, said composition comprising a chemically crosslinked, mechanically fragmented starch having a particle size (weighted average) in a range of from 1 to 1000 m of dry product, wherein the chemically crosslinked, mechanically fragmented starch is fragmented by extrusion, said extrusion comminuting the starch through a shearing action, the surfaces of the resulting fragmented starch comprising loose, partially hydrolyzed polysaccharide strands and wherein the chemical crosslinking occurs by reaction of the starch with 0.1% to 0.8% by weight of a bifunctional or polyfunctional crosslinking agent capable of reacting with at least two free hydroxyl groups of the starch.

2. The process according to claim 1 wherein the composition consists essentially of the chemically crosslinked, mechanically fragmented starch, a burn rate retarding substance and/or a burn rate accelerating substance.

3. The process according to claim 1, wherein the composition consists essentially of the chemically cross-linked, mechanically fragmented starch.

4. The process according to claim 1, wherein the composition further comprises a filler, a burn rate retarding substance, a burn rate accelerating substance or mixtures thereof.

5. The process according to claim 1, wherein the applying is effected by printing or spraying.

6. The process according to claim 1, wherein the applying is effected using a pressure nozzle.

7. The process according to claim 1, wherein the composition further comprises water, a mixture of water and organic solvent, an organic solvent, or a mixture of organic solvents.

8. The process according to claim 1, wherein the applying is by gravure printing.

9. The process according to claim 1, wherein the amount of composition applied to the base smoking article wrapper material is in a range of 0.1 to 10 g/m.sup.2 of the base smoking article wrapping material.

10. The process according to claim 1, wherein the distance between discrete zones is around 1 to 30 mm.

11. The process according to claim 10, wherein the discrete zones have a width of 5 to 10 mm.

12. The process according to claim 1, wherein the discrete zones have a width of at least 3 mm.

Description

EXAMPLES

Example 1

(1) Test cigarettes were produced. To this end, discrete bands 7 mm wide were gravure printed onto Cigla 55 standard cigarette paper capable of glowing combustion (porosity 55 CU, Julius Glatz GmbH, Neidenfels) 18 mm apart. The printing medium used was a 13.5% aqueous suspension of a chemically crosslinked and mechanically fragmented potato starch (F6493, Emsland-Strke GmbH, Emlichheim). Porosity in the coated regions is 14 CU.

(2) NIST test and freeburn test are passed 100%.

Comparative Example 1

(3) The test cigarettes were produced similarly to Example 1 except that the printing medium used was a 7.5% aqueous solution of an extremely film-formation capable potato starch hydroxypropyl ether (Emsize E2, Emsland-Starke GmbH). Porosity in the coated regions is 14 CU, the freeburn test is passed 100%, but the NIST test only 63%.

Example 2

(4) The test cigarettes were produced similarly to Example 1, except that the printing medium used was a 12.5% suspension of the chemically crosslinked and fragmented potato starch of Example 1 (F6493). Porosity within the coated regions is 25 CU, the NIST test and the freeburn test are passed 100%.

Comparative Example 2

(5) The test cigarettes were produced similarly to Example 1, except that the printing medium used was an 8% suspension of potato starch hydroxypropyl ether (Emsol K 115, Emsland-Starke GmbH, Emlichheim) in water. Porosity is 37 CU, freeburn is passed, the NIST test was not passed.