Wrapper for cigarette manufacture includes transversely extending band regions applied by a printing technique, such as gravure printing. The band regions comprise starch, an anti-wrinkling agent such as 1,2 propylene glycol or glycerin, and optionally calcium carbonate. Any suitable printing techni
Wrapper for cigarette manufacture includes transversely extending band regions applied by a printing technique, such as gravure printing. The band regions comprise starch, an anti-wrinkling agent such as 1,2 propylene glycol or glycerin, and optionally calcium carbonate. Any suitable printing technique can be used to apply the aqueous solution to the banded regions. The pattern of banded regions may be bands, stripes, two-dimensional arrays, undulated regions, and the like along and/or around the tobacco rod. The pattern can be applied in one or more layers. The pattern may be configured so that when a smoking article is placed on a substrate, at least two longitudinal locations along the length of the tobacco rod have film-forming compound located only on sides of the smoking article not in contact with the substrate.
대표청구항▼
1. A method of achieving ignition propensity not greater than 25% in a smoking article, comprising the steps of: applying an add-on material in pairs of opposing zones at spaced apart regions of a wrapper the add-on material being an aqueous starch solution including at least about 6.4% propylene gl
1. A method of achieving ignition propensity not greater than 25% in a smoking article, comprising the steps of: applying an add-on material in pairs of opposing zones at spaced apart regions of a wrapper the add-on material being an aqueous starch solution including at least about 6.4% propylene glycol by weight of the solution;transversely off-setting adjacent pairs of zones from one another such that said pairs of zones of every three or more consecutive regions are offset from one another;providing said pairs of zones with sufficient size and amount of add-on material such that the smoking article formed with the wrapper, when smoldering upon a substrate, will tend to extinguish at one of said regions; andproviding each region sufficient transverse spacing between the respective pairs of zones such that the smoking article, when smolders clear of a substrate, will tend to sustain smoldering without self-extinguishment. 2. The method of claim 1, further including: applying the add-on material to the wrapper in a pattern. 3. The method of claim 1, further including the step of including the propylene glycol in the add-on material to reduce tendency of the wrapper to shrink. 4. The method of claim 3, including relaxing shrinkage in the wrapper during drying. 5. The method of claim 1, wherein: the regions have a leading edge and a trailing edge, and including the further step of applying the regions to the wrapper such that the leading and trailing edges receive add-on material a first application rate, and such that a zone exists transversely of the wrapper and receives no add-on material. 6. The method of claim 5, further providing an undulated edge. 7. The method of claim 5, further including providing a crenellated edge. 8. The method of claim 1, wherein: the regions have a leading edge and a trailing edge, and including the further step of applying the regions to the wrapper such that the leading and trailing edges receive add-on material a first application rate, and such that a zone exists longitudinally of the wrapper and receives no add-on material. 9. The method of claim 1, including applying the add-on material as a single layer. 10. The method of claim 1, including applying the add-on material in at least two layers. 11. The method of claim 1, including applying the add-on material such that one layer includes calcium carbonate. 12. The method of claim 1, further comprising the steps of: preparing the add-on solution including at least water and an oxidized starch having:room temperature viscosity no greater than about 50 centipoises;particles in the range of about 4 to about 40 microns when dry and about 90% in the range of about 10 to about 100 microns when wet;a pH in the range of about 6 to about 6.5;the starch further being capable of forming a solution with about 20 to about 24% oxidized starch content; andthe solution having a surface tension of at least about 65 dynes per centimeter. 13. The method of claim 1, including the step of preparing the add-on material by combining an aqueous solution having starch in the range of about 14% to about 24% by weight of solution, propylene glycol in the range of about 6.4% to about 19.6% by weight of solution, and calcium carbonate in the range of 0% to about 24% by weight of solution.
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