Wax encapsulated flavour delivery system for tobacco

Abstract

A smoking composition includes tobacco material and a flavor delivery system. The flavor delivery system includes a flavor material and first wax material forming a core and a second wax material encapsulating the core. The second wax material being a different wax material than the first wax material.

Claims

1. A smoking composition comprising tobacco material and a flavour delivery system, the flavour delivery system comprising: a flavour material and a first wax material forming a core; and a second wax material surrounding and disposed directly on the core and forming an encapsulated flavour particle, the second wax material being a different wax material than the first wax material, wherein the core makes up from 1% to 50% of a total weight of the encapsulated flavour particle.

2. The smoking composition according to claim 1, wherein the first wax material has a melting point of about 100 degrees centigrade or greater.

3. The smoking composition according to claim 1, wherein second wax material has a melting point that is less than the melting point of the first wax material.

4. The smoking composition according to claim 1, wherein the flavour material is a hydrophobic liquid.

5. The smoking composition according to claim 1, wherein the flavour material is entrained or dispersed in a matrix of the first wax material.

6. The smoking composition according to claim 1, wherein the encapsulated flavour particle has a particle size in a range from about 25 micrometers to about 250 micrometers.

7. The smoking composition according to claim 1, wherein the tobacco material comprises homogenized tobacco.

8. The smoking composition according to claim 1, wherein the tobacco material comprises cast leaf tobacco.

9. The smoking composition according to claim 1, wherein at least a portion of the second wax material is melted off the core and is dispersed within the tobacco material.

10. The smoking composition according to claim 2, wherein second wax material has a melting point that is less than the melting point of the first wax material.

11. The smoking composition according to claim 4, wherein the flavour material is entrained or dispersed in a matrix of the first wax material.

12. The smoking composition according to claim 7, wherein at least a portion of the second wax material is melted off the core and is dispersed within the tobacco material.

13. The smoking composition according to claim 8, wherein at least a portion of the second wax material is melted off the core and is dispersed within the tobacco material.

14. A smoking article comprising an aerosol generating substrate comprising the smoking composition of claim 1.

15. A method of forming the smoking composition according to claim 1 comprising the steps: combining the tobacco material with the flavour delivery system to form a tobacco mixture; and heating the tobacco mixture to form the smoking composition.

16. The method according to claim 15, wherein the tobacco material comprises homogenized tobacco and water and the heating step removes at least a portion of the water from the tobacco mixture to form the smoking composition.

17. The method according to claim 15, wherein the heating step melts at least a portion of the second wax material.

18. The method according to claim 17, wherein the heating step does not melt the first wax material.

19. The method according to claim 16, wherein the heating step melts at least a portion of the second wax material.

20. The method according to claim 19, wherein the heating step does not melt the first wax material.

Description

(1) FIG. 1 is a schematic diagram of an illustrative flavour delivery system 10 or encapsulated flavour core. The schematic drawing is not necessarily to scale and is presented for purposes of illustration and not limitation. The drawing depicts one or more aspects described in this disclosure. However, it will be understood that other aspects not depicted in the drawing fall within the scope and spirit of this disclosure.

(2) Referring now to FIG. 1, the flavour delivery system 10 includes a flavour material 12 and first wax material 14 forming a core 11 and a second wax material 16 encapsulating the core 11. The second wax material 16 is a different wax material than the first wax material 14.

(3) The core 11 has a particle size or largest lateral dimension D.sub.1. The flavour delivery system 10 has a particle size or largest lateral dimension D.sub.2.

(4) Non-limiting examples illustrating flavour delivery system as described above and tobacco substrates and smoking articles having such flavour delivery systems are described below.

EXAMPLES

(5) A variety of wax materials were evaluated as described below for suitability in the flavour delivery system as described above.

(6) Flash and fire points for selected wax excipients were determined according ISO 2592 (Cleveland open cup method). The flash point is the lowest temperature at which a flame will ignite the vapors of the heated excipient, while the fire point is the lowest temperature when the vapors ignite and burn for at least 2 seconds. It will be appreciated that the melting point in practice for the wax material will depend on for example any impurities or other components in the wax, as well as the pressure. Results of this testing is reported in Table 1 under ambient pressure.

(7) TABLE-US-00001 TABLE 1 Fire Flash Melting point point point Wax Type ( C.) ( C.) Supplier ( C.) Rice bran Natural wax 299 333 Kahlwax/ 79-85 (Kahlwax Kahlwax 2811) Sunflower Natural wax 305 335 Kahlwax/ 74-80 wax Kahlwax (Kahlwax 6607) Carnauba Natural wax 315 345 Kahlwax/ 82-86 wax Kahlwax (Kahlwax 2442L) Candelilla Natural wax 269 299 Kahlwax/ 68-73 wax Kahlwax (Kahlwax 2039) Cutina wax Hard Fat 325 341 CareChemicals 83-88 Licowax Polyethylene 249 >309 Clariant/Parka 101-106 521 PED wax d.o.o. Ceridust Polyolefin wax 297 329 Clariant/Parka 108-116 2051 d.o.o. Ceridust Polyethylene 263 >303 Clariant/Parka 125-130 3610 wax d.o.o. Deurex MX Polypropylene 277 329 Deurex/Deurex 110-118 9820 wax Deurex ME Polyethylene 261 >321 Deurex/Deurex 122-130 1620 wax Deurex MT Fischer- 295 339 Deurex/Deurex 112-120 9120 Tropsch wax Sasolwax H1 Fischer- 287 327 Sasolwax/HDS 112 Tropsch wax Chemie Sasolwax Fischer- na Na Sasolwax/HDS 117 H105 Tropsch wax Chemie Vestowax Fischer- 267 295 Evonik/Evonik 102-110 EH100 Tropsch wax Vestowax Fischer- 310 333 Evonik/Evonik 108-114 SH105 Tropsch wax PEG 6000 Polymer 233 >259 Merck 55-60 PEG 35000 Polymer 259 >319 Merck 60-65 Ceridust Polypropylene 271 319 Clariant/Parka 142-148 6050M wax d.o.o. Revel A Hard fat 319 347 Loders Croklaan

(8) A sensory analysis of wax materials is determined using the descriptive criterion overall sensory neutrality to indicate intensity differences. As sensory and psychological fatigue sets in after 7-8 samples, a balanced incomplete block design (BiB) (ISO 29842) is selected for the ranking test (ISO 8587). Assessors receive per session five samples in random order and are asked to rank the samples according to the criterion. Four sessions are performed in order to achieve an adequate level of precision. Results of this BiB ranking are reported in Table 2.

(9) TABLE-US-00002 TABLE 2 BiB Ranking rank sum LSD = 13 0 Tixosil 45 A I Deurex ME 9120 37 A B Sasolwax H1 35 A B C Ceridust 3610 33 A B C Ceridust 2051 33 A B C Cutina HR 33 B C Vestowax EH 100 32 B C II Vestowax SH 105 28 B C D Sasolwax H105 27 B C D E Kahlwax 2811 (Rice Bran) 27 B C D E III Kahlwax 2442L (Carnauba) 25 B C D E F Kahlwax 2039 (Candelilla) 23 C D E F IV Deurex ME 1620 18 D E F Deurex ME 9820 17 D E F Licowax PED 521 GR 15 E F Kahlwax 6607 (Sunflower) 14 F

(10) A number of flavour delivery system are formed by first spray chilling a flavour with a first wax material to form a core and then spray chilling the core with a second wax material to form the encapsulated core or flavour delivery system. Table 3 reports the results of the materials screened.

(11) TABLE-US-00003 TABLE 3 Example flavour sieve no. Core shell load fraction 1 ceridust 3610 Revel A 25% 63-125 m (polyethylene wax) 2 ceridust 3610 Revel A 25% 125-250 m (polyethylene wax) 3 ceridust 3610 Revel A 35% 63-125 m (polyethylene wax) 4 ceridust 3610 Revel A 35% 125-250 m (polyethylene wax) 5 ceridust 3610 Sunflower 25% 63-125 m (polyethylene wax) wax 6 ceridust 3610 Sunflower 25% 125-250 m (polyethylene wax) wax

(12) These samples are then analyzed for particle size distribution, bulk density and morphology.

(13) The particle size distribution is measured by laser diffraction method with the Malvern Mastersizer 2000. The liquid dispersion unit Hydro MU is used to measure the particles dispersed in ethanol. After the samples are dispersed in ethanol the ultrasonic bath is turned on for a period of 3 minutes to break the agglomerates. After 1 minute the measurement is initiated. All samples are measured twice and the average values are reported. The interpretation of the data is done according to the theory of Fraunhofer.

(14) The Mastersizer breaks the agglomerates by using an ultrasonic batch prior to the particle size measurement; the particle size measured by laser diffraction method differs from the expected particle size of the sieved fractions. By sieving the samples, the agglomerates are not destroyed and the sieved fractions in fact consist of agglomerates rather than fractions of single particles.

(15) FIG. 2 reports the particle size distributions of the core-shell samples of Examples 1-6 produced by the double spray chilling process described above.

(16) The bulk density of the core-shell samples of Examples 1-6 is measured in accordance to DIN ISO 697. In FIG. 3 the bulk densities is reported. FIGS. 4-6 show scanning electron microscope (SEM) pictures of Example 1 (Revel A+10% C3610 25% fl.63-125 m). FIG. 4 gives an overview picture of the particles in Example 1. Nearly all particles are spherical. In FIG. 5 a close up of an agglomerate is shown. The big particles indicate double encapsulated particles and the small particles indicate a single layer of encapsulate. FIG. 6 shows a close up of a single particle with a particle size of about 80 m. The surface is very smooth and without any capillaries or holes.

(17) The flavour release of the flavour delivery system described herein was then evaluated. A flavour delivery system described herein that was formed by a two stage spray chilling was added to a cast leaf slurry prior to cast leaf tobacco substrate generation at a level of 3% (w/w). The cast leaf was generated according to a standard cast-leaf procedure involving a drying step at approximately 100 C. No special observations were made during cast leaf manufacturing, indicating no to low flavour losses. Using the generated cast leaf, consumables (tobacco sticks) were manufactured to be used in the aerosol generating substrate.

(18) Flavour release analyses were performed by the Health Canada Intense Smoking Regime. The following two examples illustrate the successful release of flavouring ingredients by the described flavour delivery system. For both examples the quantified flavouring ingredients are not detectable in the aerosol of the consumable without addition of the flavour delivery system described herein.

(19) The release quantification of the flavouring agent 3-ethylphenol using a combination of Revel A/ceridust (35%) with a particle size of 63-125 m (see Example 3) in the cast leaf of the consumable was about 14 ng per 12 puffs Health Canada intense regime.

(20) The release quantification of the flavouring agent pyrazine using a combination of sunflower/ceridust (25%) at a particle size of 63-125 m (see Example 5) in the cast leaf of the consumable was about 18 ng per 12 puffs Health Canada intense regime.