Method for producing an aerosol-forming substrate and aerosol-forming substrate

Abstract

The invention relates to a method for producing an aerosol-forming substrate comprising: providing a cellulose based strengthening agent, providing a binder, mixing of hydroxypropylmethyl cellulose, water and an aerosol-former to form a first slurry, the first slurry having a viscosity of between 0.9 Pa s and 5 Pa s, and combining the cellulose based strengthening agent, the binder and the first slurry in order to obtain a final slurry, and drying the final slurry to obtain the aerosol-forming substrate. This method provides a first slurry having reduced viscosity and less water content.

1 - 15 . (canceled) 
     
     
         16 . A method for producing an aerosol-forming substrate comprising:
 providing a cellulose based strengthening agent, wherein the cellulose based strengthening agent is selected from a group consisting of: cellulose fibers, microcrystalline cellulose and cellulose powder,   providing a binder, wherein the binder is selected from a group consisting of: methyl cellulose and carboxymethyl cellulose,   mixing of hydroxypropylmethyl cellulose, water and an aerosol-former to form a first slurry, the first slurry having a viscosity of between 0.9 Pa·s and 5 Pa·s, and   combining the cellulose based strengthening agent, the binder and the first slurry in order to obtain a final slurry, and   drying the final slurry to obtain the aerosol-forming substrate.   
     
     
         17 . The method according to  claim 16 , wherein the weight proportions of water:aerosol-former:hydroxypropylmethyl cellulose in the first slurry are 1:2 to 10:2 to 3.5, preferably wherein first water and aerosol-former are mixed in a weight proportion of water:aerosol-former of 1:2 to 10 and subsequently hydroxypropylmethyl cellulose is added in a weight proportion of hydroxypropylmethyl cellulose:aerosol-former of 1:1 to 3. 
     
     
         18 . The method according to  claim 16 , wherein the cellulose based strengthening agent is cellulose fibers. 
     
     
         19 . The method according to  claim 16 , wherein the aerosol-former is selected from a group consisting of: polyhydric alcohols, such as triethylene glycol, 1,3-butanediol and glycerine; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, preferably wherein the aerosol-former is selected from a group consisting of: propylene glycol and glycerin, more preferably wherein the aerosol-former is glycerin. 
     
     
         20 . The method according to  claim 16 , wherein the binder is carboxymethyl cellulose. 
     
     
         21 . The method according to  claim 16 , wherein the cellulose based strengthening agent and water are mixed in weight proportions of cellulose fibers:water of 1:20 to 40 to form a second slurry and wherein the second slurry is combined with one or both of the first slurry or the binder. 
     
     
         22 . The method according to  claim 16 , wherein the weight proportion of the second slurry:first slurry is 1:4 to 8, preferably 1:5 to 7, more preferably 1:6 to 6.5. 
     
     
         23 . The method according to  claim 16 , wherein the binder is mixed with water to provide a third slurry, preferably wherein the weight proportion of binder:water is 1:30 to 200. 
     
     
         24 . The method according to  claim 16 , wherein the first slurry, second slurry and third slurry are formed and wherein subsequently the slurries are mixed, preferably at a weight proportion of first slurry:second slurry:third slurry of 1:0.1 to 10:3 to 20, preferably 1:0.5 to 8:4 to 15. 
     
     
         25 . The method according to  claim 16 , wherein nicotine is included in at least one of: the first slurry, the second slurry, the third slurry or the final slurry. 
     
     
         26 . The method according to  claim 16 , wherein the aerosol-forming substrate is dried to a residual water content of between 5 weight percent and 15 weight percent based on the total weight of the aerosol-forming substrate. 
     
     
         27 . A solid aerosol-forming substrate for use in an aerosol-generating system, the
 aerosol-forming substrate comprising:
 between 40 weight percent to 60 weight percent based on the total weight of the aerosol-forming substrate of an aerosol-former; 
 between 12 weight percent to 25 weight percent based on the total weight of the aerosol-forming substrate of hydroxypropylmethyl cellulose; 
 between 3 weight percent to 10 weight percent based on the total weight of the aerosol-forming substrate of a binder, wherein the binder is selected from a group consisting of: methyl cellulose and carboxymethyl cellulose, 
 between 4 weight percent to 25 weight percent based on the total weight of the aerosol-forming substrate of a cellulose based strengthening agent, wherein the cellulose based strengthening agent is selected from a group consisting of: cellulose fibers, microcrystalline cellulose and cellulose powder, and 
 water. 
   
     
     
         28 . The aerosol-forming substrate according to  claim 27 , comprising between 16 weight percent to 23 weight percent of hydroxypropylmethyl cellulose. 
     
     
         29 . The aerosol-forming substrate according to  claim 27 , comprising between 4 weight percent to 7 weight percent of binder.