Wrapper Paper for Smoking Articles, with Improved Ash Formation

Abstract

The invention relates to a wrapper paper for smoking articles, comprising cellulose fibres loaded with calcium carbonate particles, wherein the mass of the cellulose fibres loaded with calcium carbonate particles is at least 1% of the mass of the wrapper paper, and the calcium carbonate particles in the cellulose fibres loaded with calcium carbonate particles make up at least 5% and no more than 80% of the mass of the cellulose fibres loaded with calcium carbonate particles.

1 . Wrapper paper for smoking articles, which comprises pulp fibers loaded with calcium carbonate particles, wherein the mass of the pulp fibers loaded with calcium carbonate particles is at least 1% of the mass of the wrapper paper and the calcium carbonate particles in the pulp fibers loaded with calcium carbonate particles make up at least 20% and at most 80% of the mass of the pulp fibers loaded with calcium carbonate particles, and the wrapper paper has an air permeability in accordance with ISO 2965:2019 of at least 50 cm 3 /(cm 2 ·min·kPa) and at most 300 cm 3 /(cm 2 ·min·kPa). 
     
     
         2 . Wrapper paper according to  claim 1  which, in addition to the pulp fibers loaded with calcium carbonate particles, also contains pulp fibers which are not loaded with calcium carbonate particles and their proportion is at least 10% and at most 80%, each with respect to the mass of the wrapper paper. 
     
     
         3 . Wrapper paper according to  claim 1 , wherein the pulp fibers loaded with calcium carbonate particles and, if present, also the pulp fibers not loaded with calcium carbonate particles, are at least partially sourced from spruce, pine or fir, f eucalyptus, birch or beech, or from hemp, flax, sisal, aback or cotton. 
     
     
         4 . (canceled) 
     
     
         5 . Wrapper paper according to  claim 1 , wherein the pulp fibers loaded with calcium carbonate particles are at least partially located in the bulk of the wrapper paper, wherein the proportion of pulp fibers loaded with calcium carbonate particles is at least 5% and at most 80%, each with respect to the mass of the wrapper paper. 
     
     
         6 . Wrapper paper according to  claim 1 , which has a coating and wherein the pulp fibers loaded with calcium carbonate particles are at least partially located in the coating, wherein their proportion, in the case in which the pulp fibers loaded with calcium carbonate particles are exclusively located in the coating, is at least 1% and at most 30%, each with respect to the mass of the wrapper paper. 
     
     
         7 . Wrapper paper according to  claim 1 , wherein the calcium carbonate particles of the pulp fibers loaded with calcium carbonate particles are formed by precipitated calcium carbonate particles with a rhombohedral structure. 
     
     
         8 . Wrapper paper according to  claim 1 , wherein the mass of the calcium carbonate particles with respect to the mass of the pulp fibers loaded with calcium carbonate particles is at least 20% and at most 60%. 
     
     
         9 . Wrapper paper according to  claim 1 , which further contains free filler materials that are not bonded to the pulp fibers, wherein the proportion of free filler materials is at least 1% and at most 40%, each with respect to the mass of the wrapper paper. 
     
     
         10 . Wrapper paper according to  claim 9 , wherein the free filler materials are formed by calcium carbonate, magnesium carbonate, magnesium oxide, magnesium hydroxide, aluminum hydroxide, titanium dioxide, talcum, kaolin, calcinated kaolin and mixtures thereof. 
     
     
         11 .- 13 . (canceled) 
     
     
         14 . Wrapper paper according to  claim 1 , wherein at least 95% of its surface has a coating which contains pulp fibers loaded with calcium carbonate particles. 
     
     
         15 . Wrapper paper according to  claim 14 , wherein the coating further comprises a binder that is suitable for binding the free calcium carbonate particles or the pulp fibers loaded with calcium carbonate particles to the wrapper paper. 
     
     
         16 . Wrapper paper according to  claim 14 , wherein the coating comprises further components selected from the group consisting of burn additives, colorants, flavors, humectants, glycerol or propylene glycol, or substances for adjusting the viscosity. 
     
     
         17 . Wrapper paper according to  claim 14 , wherein the coating is located on that side of the wrapper paper that faces the outside of the smoking article to be manufactured therefrom. 
     
     
         18 . Wrapper paper according to  claim 14 , wherein the mass per unit area of the coating is at least 0.5 g/m 2  and at most 10 g/m 2 . 
     
     
         19 . (canceled) 
     
     
         20 . Wrapper paper according to  claim 19 , which additionally contains pulp fibers loaded with calcium carbonate particles in the bulk, wherein the mass of the pulp fibers loaded with calcium carbonate particles in the wrapper paper without the coating is at least 1% and at most 60% of the mass of the wrapper paper and the calcium carbonate particles in the pulp fibers loaded with calcium carbonate particles make up at least 10% and at most 60% of the mass of the pulp fibers loaded with calcium carbonate particles. 
     
     
         21 . (canceled) 
     
     
         22 . Wrapper paper according to  claim 1 , with a basis weight of at least 20 g/m 2  and at most 120 g/m 2 , wherein a coating, if present, counts towards the basis weight of the wrapper paper. 
     
     
         23 . (canceled) 
     
     
         24 . Wrapper paper according to  claim 1 , with a tensile strength of at least 10 N/15 mm. 
     
     
         25 . Wrapper paper according to  claim 1 , with a tensile strength of at most 100 N/15 mm. 
     
     
         26 .- 27 . (canceled) 
     
     
         28 . Wrapper paper according to  claim 1 , with a brightness in accordance with ISO 2470-1:2016 of at least 90%. 
     
     
         29 . Wrapper paper according to  claim 1 , with an opacity in accordance with ISO 2471:2008 of at least at least 80%. 
     
     
         30 - 31 . (canceled) 
     
     
         32 . Laminate comprising a wrapper paper according to  claim 1  and a further material the thermal conductivity of which exceeds the thermal conductivity of the wrapper paper by a factor of at least two. 
     
     
         33 . Smoking article comprising an aerosol-forming material and a wrapper paper according to  claim 1 . 
     
     
         34 . Smoking article according to  claim 33 , wherein the aerosol-forming material comprises tobacco, wherein the smoking article is a cigarette and the wrapper paper is a cigarette paper. 
     
     
         35 . Smoking article according to  claim 33  in which, during its intended use, the aerosol-forming material is only heated but not burnt.