RU2676255C1 - Wax encapsulated flavour delivery system for tobacco - Google Patents

Abstract

FIELD: tobacco industry.SUBSTANCE: invention relates to a smoking composition, which contains tobacco material and a flavour delivery system, wherein the flavour delivery system includes a flavour material and a first wax material forming a core; and a second wax material surrounding the core and forming a particle with an encapsulated flavour, wherein the second wax material is a wax material different from the first wax material.EFFECT: ensuring uniformity of taste of the smoking material and storage stability of flavours added to a tobacco substrate.15 cl, 6 dwg, 3 tbl

Description

The present invention relates to flavor delivery systems for smoking articles in which the flavor is encapsulated in wax and combined with tobacco for smoking articles.

Flammable smoking articles, such as cigarettes, usually contain a tobacco substrate, which is cut tobacco (usually in the form of a cut filler) surrounded by a paper wrapper forming a tobacco rod. To use a cigarette, the smoker sets fire to one end of the cigarette, and the shredded tobacco rod begins to burn. The smoker then receives inhaled smoke, puffing at the opposite end or end of the cigarette to the mouth, which usually contains a filter. In traditional cigarettes, tobacco burns and temperatures are formed that contribute to the release of volatile compounds into the inhaled smoke. It is known that to modify the aroma of inhaled smoke, cigarettes are equipped with single-segment and multi-segment mouthpiece filters containing flavorings such as menthol.

Several smoking articles are known in the art in which an aerosol generating substrate, such as a tobacco substrate, is heated rather than burned. Such products may be referred to by the term “aerosol generating products”. Examples of systems that use aerosol generating products include systems that heat a tobacco-containing substrate above 200 degrees Celsius to form a nicotine-containing aerosol. Typically, in such heated aerosol generating articles, the inhaled aerosol is typically generated by transferring heat from a heat source to a substrate or aerosol forming material that can be located inside, around, or downstream of the heat source. During use of the aerosol generating article, volatile compounds are released from the aerosol forming substrate by transferring heat from the heat source and into the air drawn through the article. When the released compounds are cooled, they condense to form an aerosol inhaled by the consumer.

For example, in the manufacture of these smoking articles, the tobacco substrate is usually heated or dried to remove water. During this heating or drying step, volatile compounds, such as flavors, are removed from the tobacco substrate, changing the taste of the finished smoking article. Currently, aromatic substances are sprayed directly onto the dried tobacco substrate. This method is called “top fill”. This method is complicated because the dosage and final concentration of aromatic substances on the tobacco substrate may depend on environmental conditions and the design of the atomization device. In addition, the aromatic substance may be moved or released from the tobacco substrate during storage. All of these factors can lead to undesirable variability in the taste of the product.

It is desirable to improve the uniformity of the taste of the smoking article and the storage stability of the flavorings added to the tobacco substrate (tobacco rod or aerosol generating substrate).

Compositions for smoking containing tobacco material with the aroma delivery system described herein can be used in traditional combustible smoking articles or in an aerosol generating substrate, aerosol generating smoking articles. Aroma delivery systems can provide smokers with a predictable and stable release of aroma. This is especially useful when combined with aerosol generating substrates that are heated during the production of an aerosol generating substrate.

As described herein, a smoking composition includes an aroma delivery system and tobacco material. The aroma delivery system includes an aromatic substance and a first wax material forming the core, and a second wax material encapsulating the core, which is different from it. Preferably, the first wax material has a melting point of about 100 degrees Celsius or higher. The aromatic substance may be a hydrophobic liquid. The tobacco material is preferably homogenized tobacco or reconstituted tobacco sheet forming an aerosol generating substrate.

Various aspects of smoking compositions containing tobacco material with an aroma delivery system described herein may have one or more advantages over standard tobacco compositions. For example, aroma delivery systems provide improved aroma perception compared to tobacco compositions not containing an aroma delivery system. The wax material does not affect or change the notes of the aroma of the tobacco composition. Wax materials encapsulate an aromatic substance to protect the aromatic substance during the manufacture and storage of the smoking article including these tobacco compositions, and also release the aromatic substance in the predicted manner during the use of the smoking article. Combining the aroma delivery system with tobacco material to form a composition for smoking also provides a uniform distribution of aroma in the composition for smoking. Fragrance delivery systems can replace or improve tobacco flavor notes that have been modified during the manufacture of the aerosol generating substrate. In addition, the outer wax coating or envelope surrounding or encapsulating the aromatic substance, and the inner wax core may be a sacrificial layer that can perform the function of heat dissipation, further protecting the core from the release of aromatic substances during the manufacture or storage of the composition for smoking. Further advantages of one or more aspects of the flavor delivery system described herein will become apparent to those skilled in the art after reading and understanding the present invention.

The term “wax material” refers to products of natural or synthetic wax that are hydrophobic and can transform into a molten liquid state (dropping temperature) at temperatures below 200 degrees Celsius and practically do not contain ash-forming compounds.

The term "flavoring" or "aromatic substance" refers to organoleptic compounds, compositions or materials that alter the taste or aromatic characteristics of a tobacco substrate when consumed.

The term “smoking article” includes cigarettes, cigars, cigarillos and other articles in which smoking material, such as tobacco, is ignited and burned to produce smoke. The term “smoking article” also includes articles in which the smoking composition does not burn, such as, but not limited to, smoking articles that directly or indirectly heat the smoking composition without igniting or burning the smoking composition, or smoking articles in which the smoking composition does not burn or heat, and an air stream or chemical reaction is used to deliver nicotine, a flavoring compound, or other materials from the tobacco substrate.

As used herein, the term “smoke” or “inhaled smoke” is used to describe the aerosol generated by heating or burning a tobacco substrate of a smoking article. The aerosol generated by the smoking article may, for example, be smoke generated by combustible smoking articles, such as cigarettes, or aerosols generated by non-combustible smoking articles, such as heated smoking articles or unheated smoking articles.

As used herein, the term “atomization” refers to a process in which a liquid, which may contain molten material, a solution, an emulsion, or a combination thereof, is forced to flow through one or more openings in the atomizer and is separated into droplets or particles.

The present invention provides smoking compositions containing tobacco material with a flavor delivery system for smoking articles. The aroma delivery system contains an aromatic substance and a first wax material forming a core. The first wax material encapsulates an aromatic substance. A second wax material surrounds the core and forms an encapsulated core or double encapsulated flavor. The second wax material is a wax material different from the first wax material.

The flavor delivery system described herein provides an improved method for incorporating flavorings into a smoking article. The types of flavors used in smoking articles are generally relatively volatile, and therefore, maintaining acceptable levels of flavors in smoking articles during manufacture and storage is difficult. Volatile flavors can also move to other parts of the smoking article and can adversely affect the characteristics of other components of the smoking article, such as any sorbents located inside the filter.

The aroma delivery system can in a controlled manner release the aromatic substance or flavor into the environment by increasing the ambient temperature. The second wax material forms a shell around the core. In some embodiments, the second wax material has a melting point (drop formation) higher than the melting temperature (drop formation) of the first wax material. In some embodiments, the second wax material has a melting point (drop formation) substantially equal to the melting temperature (drop formation) of the first wax material. Preferably, the second wax material has a melting point (drop formation) lower than the melting temperature (drop formation) of the first wax material. The melting point (dropping) can be determined using a standard test method for determining the dropping temperature of waxes, known from ASTM D3954-94 (2010).

The aroma or flavor may be dispersed or incorporated into the first wax material or enclosed in a first wax material. If they are dispersed or incorporated into a wax material, this is usually called a matrix. If covered by wax material, this is commonly referred to as a core-shell construction. Thus, the core containing the first wax material and the aromatic substance may be a matrix or a core-shell structure. Preferably, the aromatic substance or flavor is dispersed or incorporated into the first wax material. In many embodiments, the aromatic substance or flavor is dispersed in the first wax material when the first wax material is in molten form. A core is a particle (called a core particle) that can be formed in any suitable manner. Preferably, the core particle is formed by atomization, such as spray cooling. Spray cooling provides a more uniform particle size than, for example, traditional spray drying. In addition, spray cooling reduces the amount of heat supplied to the aromatic substance, thereby reducing evaporation losses or undesirable changes in the aromatic substance. Preferably, the spray cooling is carried out with an inert gas, such as carbon dioxide or nitrogen, to further reduce the conversion or undesirable changes in the aromatic substance.

The core particle can then be encapsulated with a second wax material to form an encapsulated core. The core particle may be dispersed in a second wax material. Preferably, the core particle is dispersed in the second wax material when the second wax material is in molten form. The encapsulated core particle may be formed in any suitable manner. Preferably, the encapsulated core particle is formed by atomization, such as spray cooling, as described above.

Suitable wax materials are selected from the group consisting of natural and synthetic waxes and mixtures thereof. Natural waxes are obtained from animals, plants, minerals and oil. Animal waxes include, for example, beeswax, Chinese wax, lanolin, shellac and spermaceti wax, etc. Plant-based waxes include, for example, carnauba wax, candelilla wax, Mirica wax, sugarcane wax, castor wax , esparto wax, Japanese wax, jojoba wax, ourikuri wax, rice bran wax, soy wax, etc. Mineral waxes include, for example, ceresin wax, montan wax, mountain wax, peat wax and the like. Waxes of petroleum origin include, for example, paraffin wax, petroleum jelly, microcrystalline wax, etc. Synthetic waxes include, for example, polyethylene waxes, Fischer-Tropsch waxes, chemically modified waxes, substituted amide waxes, polymerized alpha olefins, etc. .

Particularly suitable wax materials do not alter the aroma of the tobacco substrate, have a suitable melting or dropping point, flash point, flash point, polarity, and are safe to use. The flash point and ignition temperature of wax materials is especially important when the flavor delivery system described herein is combined with tobacco and heated in the manufacture of a tobacco substrate. It is preferable to use wax materials having a flash point and a flash point higher than the temperatures affecting the wax materials in the manufacturing process. The flash point is the lowest temperature at which the flame ignites the vapor of the heated filler, while the flash point is the lowest temperature at which the vapor burns for at least 2 seconds.

Examples of suitable waxes include polyethylene waxes, polyethylene glycol waxes, or vegetable waxes.

Typical examples of polyethylene waxes are marketed under the trade name CERIDUST by Clariant International Ltd., Switzerland. Typical examples of polyethylene glycol waxes are marketed under the trade name CARBOWAX by Dow Chemical Co., USA. Typical examples of vegetable waxes are marketed under the trade name REVEL by Loders Croklaan, The Netherlands.

Flavoring agents or flavoring agents may be flavoring agents, liquid or solid (at room temperature of approximately 22 degrees Celsius and a pressure of one atmosphere), which may include flavoring compositions, flavoring materials, and flavoring precursors. The flavor may include one or more natural flavors, one or more synthetic flavors, or a combination of natural and synthetic flavors. Preferably, the aromatic substance is a liquid. Preferably, the aromatic substance is a hydrophobic liquid.

A hydrophobic liquid aromatic substance is usually able to dissolve in organic solvents, but slightly soluble in water. Preferably, this hydrophobic liquid aromatic substance is characterized by a Hildebrand solubility parameter of less than 30 MPa ^1/2 . Incompatibility with water of most oily liquids can actually be expressed using the Hildebrand solubility parameter δ, which is usually below 25 MPa ^1/2 , while for water it is 48 MPa ^1/2 , and 15-16 MPa ^1/2 for alkanes . This parameter provides an applicable scale of polarity, correlated with the energy density of the cohesive bond of the molecules. For the occurrence of spontaneous mixing, it is necessary to maintain a minimum difference in the parameters δ of the mixed molecules. The solubility parameters reference book (published by AFM Barton, CRC Press, Bocca Raton, 1991) provides a list of δ values for many chemicals, as well as methods for calculating recommended group fractions that allow calculating δ values for complex chemical structures.

Flavors or fragrances belong to a variety of flavoring materials of natural or synthetic origin. These include single compounds and mixtures. Preferably, the flavoring or aromatic substance has flavoring properties that improve the sensation of a non-combustible smoking article to provide, for example, a sensation similar to that of smoking a combustible smoking article. For example, a flavoring or flavoring agent may improve flavoring properties, such as the degree of filling of the oral cavity and balance. Balance in the general sense is known as the general harmony of the flavoring substance, which is more “rich” without the dominance of individual sensory attributes. The degree of filling of the oral cavity is described as the perception of saturation and volume in the oral cavity and throat of the consumer.

Suitable flavors and aromas include, but are not limited to, any natural or synthetic aromatic substance or aroma, such as tobacco, smoky, menthol, peppermint (such as peppermint and curly mint), chocolate, licorice, citrus and other fruit flavors, gamma octalactone, vanillin, ethyl vanillin, flavors for fresh breath, spicy flavors such as cinnamon, methyl salicylate, linalool, bergamot oil, geranium oil, lemon oil, ginger oil, etc.

Other suitable flavoring agents and aromas may include flavoring compounds selected from the group consisting of acid, alcohol, ester, aldehyde, ketone, pyrazine, combinations or mixtures thereof, etc. Suitable flavoring compounds may be selected, for example, from the group consisting of phenylacetic acid, solanone, megastigmatienone, 2-heptanone, benzyl alcohol, cis-3-hexenyl acetate, valerianic acid, valerianic aldehyde, ester, terpene, sesquiterpene, nutcatone, maltol, damascenone , pyrazine, lactone, anethole, iso-s valerianic acid, combinations thereof, and the like.

Further specific examples of flavoring agents can be found in contemporary literature, for example, in Perfume and Flavor Chemicals, 1969, by S. Arctander, Montclair N.J. (USA); Fenaroli's Handbook of Flavor Ingredients CRC Press, or Synthetic Food Adjuncts by M.B. Jacobs, van Nostrand Co., Inc. They are well known to specialists in the field of aromatization, that is, to impart a smell or taste to a product.

In some embodiments, the flavoring agent is a highly effective flavoring agent and is typically used in concentrations that result in less than 200 ppm in aerosol or inhaled smoke. Examples of such flavors are key tobacco flavors such as beta-damascenone, 2-ethyl-3,5-dimethylpyrazine, phenylacetaldehyde, guaiacol and furaneol. A person can feel other flavors only at higher levels of concentration. These flavors, which are referred to herein as low-performance flavors, are typically used in concentrations that result in an order of magnitude greater amount of flavor released into aerosol or inhaled smoke. Suitable low-performance flavors include, but are not limited to, natural or synthetic menthol, peppermint, spearmint, coffee, tea, spices (such as cinnamon, cloves and ginger), cocoa, vanilla, fruit flavors, chocolate, eucalyptus, geranium, eugenol and linalool.

In preferred embodiments, the first wax material of the aroma delivery system has a melting point of about 100 degrees Celsius or higher, or about 120 degrees Celsius or higher, or about 140 degrees Celsius or higher, or about 150 degrees Celsius or higher. In many embodiments, the first wax material has a melting point in the range of from about 100 degrees Celsius to 150 degrees Celsius or from about 110 degrees Celsius to about 140 degrees Celsius. In many embodiments, the first wax material has a melting point not exceeding approximately 200 degrees Celsius.

In preferred embodiments, the second wax material of the aroma delivery system has a melting point of about 100 degrees Celsius or less, or about 90 degrees Celsius or less, or about 80 degrees Celsius or less, or about 70 degrees Celsius or less. In many embodiments, the second wax material has a melting point in the range of from about 50 degrees Celsius to 100 degrees Celsius, or from about 50 degrees Celsius to about 80 degrees Celsius. In many embodiments, the second wax material has a melting point of about 40 degrees Celsius.

In preferred embodiments, the first wax material has a higher melting point than the second wax material. In some embodiments, the first wax material has a higher melting point, which is approximately 30 degrees, or at least 40 degrees, or at least 50 degrees higher than the melting temperature of the second wax material. The aromatic substance is released from the aroma delivery system when the first wax material is heated above its melting point. Preferably, the first and second wax materials are selected with different melting points, as a result of which a slight melting occurs when the second wax material is used, or essentially the first wax material of the core does not melt.

The aromatic substance may be present in the core in any suitable amount. In many embodiments, the aroma is present in the core in an amount of at least about 5% by weight. In many embodiments, the aromatic substance is present in the core in an amount of less than about 50 wt.%. In many embodiments, the aroma is present in the core in an amount of from about 5 to about 50 wt.%, Or from about 5 to about 35 wt.%, Or from about 10 to about 30 wt.%.

Using the flavor delivery system described herein to provide a flavor within a smoking article advantageously reduces the loss of flavor during storage in order to maintain a large proportion of the flavor in the smoking article. Therefore, the aroma delivery system can deliver a more saturated aromatic substance to the inhaled smoke. Since the loss of flavor is reduced, it is possible to incorporate a smaller amount of flavor in each smoking article while providing the same effect on the flavor as provided in modern smoking articles.

The core may have any suitable particle size or largest transverse size. In many embodiments, the core has a particle size of approximately less than 30 micrometers or approximately less than 20 micrometers. In many embodiments, the core has a particle size of greater than about 1 micrometer, or greater than about 5 micrometers. In many embodiments, the core has a particle size in the range of from about 1 to about 30 micrometers, or from about 5 to about 25 micrometers, or from about 5 to about 20 micrometers.

The encapsulated core may have any suitable particle size or largest transverse size. In many embodiments, the encapsulated core has a particle size of less than about 250 micrometers, or about less than 200 micrometers. In many embodiments, the encapsulated core has a particle size of greater than about 25 micrometers, or greater than about 50 micrometers. In many embodiments, the encapsulated core has a particle size in the range of from about 25 to about 300 micrometers, or from about 25 to about 250 micrometers, or from about 50 to about 200 micrometers.

The core may be combined with the first wax material in any suitable amount to form an encapsulated core particle or flavor delivery system. In many embodiments, the core represents at least about 1% by weight of the total weight of the encapsulated core particle. In many embodiments, the core represents at least about 5% by weight of the total weight of the encapsulated core particle. In many embodiments, the core represents less than about 50 weight percent of the total weight of the encapsulated core particle. In many embodiments, the core represents a range of from about 1 to about 50 wt.% Of the total weight of the encapsulated core particle, or from about 5 to about 50 wt.% Of the total weight of the encapsulated core particle, or from about 10 to about 35 wt.% of the total weight of the encapsulated core particle.

The aroma delivery system combines with the tobacco material to form a tobacco or smoking composition that provides a stable and predictable release of the aroma as the tobacco or smoking composition is heated to a temperature at which the wax material melts and releases the aromatic substance into the inhaled smoke or aerosol for consumption . The aroma delivery system can be combined with cut tobacco to form a tobacco composition or a smoking composition for use with traditional combustible smoking articles. Preferably, the aroma delivery system may be combined with reconstituted or homogenized tobacco to form a tobacco or smoking composition for use with aerosol generating articles. Preferably, the homogenized tobacco is a reconstituted tobacco sheet.

Smoking articles may contain an aerosol generating substrate that is assembled, often with other components, in the form of a rod. Typically, such a rod has such a shape and dimensions that it can be inserted into an aerosol generating device containing a heating element for heating the aerosol generating substrate.

An “aerosol forming substrate” or “an aerosol generating substrate”, as used herein, is a type of smoking composition that can be used to produce aerosol in an aerosol generating device. The aerosol generating substrate can release an aromatic compound when heated. The aerosol generating substrate may contain both liquid and solid components. The aerosol generating substrate may comprise tobacco material and the aroma delivery system described, wherein the aromatic substance is released from the substrate by heating. Preferably, the aerosol generating substrate does not burn. The aerosol generating substrate may further comprise an aerosol forming substance. Examples of suitable substances for aerosol formation are glycerin and propylene glycol. Optionally, the aerosol generating substrate may be provided on or incorporated into the carrier, the carrier may take the form of powder, granules, beads, grains, thin tubes, strips or sheets. The aerosol generating substrate may be applied to the surface of the carrier in the form of, for example, a sheet, foam, gel or suspension. The aerosol generating substrate may be applied over the entire surface of the carrier or alternatively may be applied in a pattern to provide a non-uniform delivery of flavor during use.

Homogenized tobacco can be used to make an aerosol generating substrate for use in smoking articles that are heated in an aerosol generating device. In this context, the term "homogenized tobacco" means a material formed by agglomeration of tobacco in the form of particles. Tobacco dust generated during grinding of tobacco during transportation and manufacture, leaf blade, stems and other tobacco waste, which are finely ground, can be mixed with a particle agglomeration binder. Homogenized tobacco may contain other additives in addition to the flavoring or flavor delivery composition, including, but not limited to, aerosol forming agents, plasticizers, moisturizers, and non-tobacco fibers, fillers, aqueous and non-aqueous solvents, and combinations thereof. Homogenized tobacco may be molded, extruded or rolled. Several reduction methods are known in the art for the manufacture of homogenized tobacco materials. These include, but are not limited to, papermaking processes of the type described, for example, in US Pat. No. 5,724,998; molding (leaf forming) processes of the type described, for example, in document US 5724998; processes for the restoration of pasty mass related to the type described, for example, in document US 3894544; and extrusion processes of the type described, for example, in document GB 983928.

An aroma delivery system may be integrated into the tobacco material, such as, for example, a reconstituted tobacco sheet substrate formed during leaf formation. This type of process is known as the leaf forming process and is used in the tobacco industry to produce reconstituted or homogenized tobacco for use in a conventional cigarette. Reconstituted tobacco leaf substrates can be formed by combining homogenized tobacco powder with water, glycerin and other optional additives to form a suspension and incorporate the described flavor delivery system into the suspension. The suspension can then be molded and dried (heated) to remove water and form a tobacco substrate and in the form of a reconstituted tobacco sheet.

The process of forming such a sheet may include applying temperatures up to about 140 ° C, such as, for example, from about 90 ° C to 140 ° C. Accordingly, one or both of the wax materials of the aroma delivery system is preferably stable at such temperatures. Preferably, the first wax material of the core is stable at such temperatures, as a result of which the aromatic substance is not released during the heating step during leaf formation. In many embodiments, the second wax material has a melting point substantially equal to the drying temperature in the drying step during leaf formation. In some embodiments, the second wax material has a melting point lower than the drying temperature in the drying step during leaf formation. In these embodiments, at least a portion of the shell or the second wax material is melted away from the core and dispersed within the homogenized tobacco material. Preferably, the first wax material forming the core of the flavoring substance has a melting point in excess of the temperature used to form the substrate in the form of a reconstituted tobacco sheet.

All scientific and technical terms used in this document have the meanings commonly used in this field, unless otherwise indicated. The following definitions are intended to facilitate understanding of some of the terms often used in this document.

The singular forms used in this application include embodiments having references to the plural, unless the content clearly indicates otherwise.

Used in this application, the union “or” is usually used in a meaning including “and / or”, unless the content clearly indicates otherwise. The term “and / or” means one or all of the listed elements or a combination of any two or more of the listed elements.

Used in this application, the expressions “have”, “having”, “include”, “including”, “contain”, “containing” or the like are used in their broad sense, and generally mean “including without limitation”. It should be understood that the expressions “consisting essentially of”, “consisting of”, etc., belong to the category of “comprising”, etc.

The words “preferred” and “preferably” refer to embodiments of the invention that may provide certain advantages in certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. In addition, listing one or more preferred embodiments does not imply that other embodiments are not suitable, and is not intended to exclude other embodiments from the scope of the invention, including the claims.

In FIG. 1 is a schematic representation of an exemplary aroma or encapsulated fragrance core delivery system 10. The schematic is not necessarily drawn to scale and presented for purposes of illustration and not limitation. The graphic materials depict various aspects described in this invention. However, it should be understood that other aspects not shown in the graphic materials fall within the scope and essence of the present invention.

As shown in FIG. 1, the aroma delivery system 10 comprises an aromatic substance 12 and a 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 wax material different from the first wax material 14.

The core 11 has a particle size or largest transverse dimension D1. The aroma delivery system 10 has a particle size or largest transverse dimension D2.

Non-limiting examples illustrating the above aroma delivery system, and tobacco substrates and smoking articles containing such aroma delivery systems are described below.

EXAMPLES

Various wax materials were evaluated, as described below, regarding their applicability in the aroma delivery system, as described above.

Flash point and flash point for selected wax fillers were determined according to ISO 2592 (method using the Cleveland open crucible device). The flash point is the lowest temperature at which the flame ignites the vapor of the heated filler, while the flash point is the lowest temperature at which the vapor burns for at least 2 seconds. It should be understood that in practice the melting point of the wax material will depend, for example, on any impurities or other components in the wax, as well as pressure. The results of this test are presented in table 1 at atmospheric pressure.

TABLE 1 Wax Type of Temperature
ignition
(° C) Flash point
(° C) Provider Melting temperature
(° C) Rice Bran Wax (Kahlwax 2811) Natural wax 299 333 Kahlwax / kahlwax 79–85 Sunflower Wax (Kahlwax 6607) Natural wax 305 335 Kahlwax / kahlwax 74–80 Carnauba Wax (Kahlwax 2442L) Natural wax 315 345 Kahlwax / kahlwax 82–86 Candelilla Wax (Kahlwax 2039) Natural wax 269 299 Kahlwax / kahlwax 68–73 Wax brand Cutina Solid fat 325 341 CareChemicals 83–88 Licowax 521 PED Polyethylene wax 249 > 309 Clariant / Parka d.o.o. 101-106 Ceridust 2051 Polyolefin wax 297 329 Clariant / Parka d.o.o. 108–116 Ceridust 3610 Polyethylene wax 263 > 303 Clariant / Parka d.o.o. 125-130 Deurex MX 9820 Polypropylene wax 277 329 Deurex / deurex 110–118 Deurex ME 1620 Polyethylene wax 261 > 321 Deurex / deurex 122–130 Deurex MT 9120 Fischer-Tropsch Wax 295 339 Deurex / deurex 112-120 Sasolwax h1 Fischer-Tropsch Wax 287 327 Sasolwax / HDS Chemie 112 Sasolwax h105 Fischer-Tropsch Wax there is no data There is no data Sasolwax / HDS Chemie 117 Vestowax EH100 Fischer-Tropsch Wax 267 295 Evonik / Evonik 102-110 Vestowax SH105 Fischer-Tropsch Wax 310 333 Evonik / Evonik 108–114 PEG 6000 Polymer 233 > 259 Merck 55-60 PEG 35000 Polymer 259 > 319 Merck 60–65 Ceridust 6050M Polypropylene wax 271 319 Clariant / Parka d.o.o. 142–148 Revel a Solid fat 319 347 Loders croklaan -

Organoleptic analysis of wax materials is carried out using the descriptive criterion of "general organoleptic neutrality" to indicate differences in saturation. Since organoleptic and psychological fatigue occurs after 7–8 samples, a balanced non-block plan (BiB) (ISO 29842) was chosen for the evaluation test (ISO 8587). Evaluation experts receive five samples per session at random and must evaluate the samples according to the criterion. To achieve a sufficient level of accuracy, four sessions are conducted. The results of this BiB assessment are presented in table 2.

TABLE 2 BiB score Total score LSD = 13 0 Tixosil 45 A I Deurex MT 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 A 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 (Karnaubsky) 25 B C D E F Kahlwax 2039 (Candelilla) 23 C D E F IV Deurex ME 1620 eighteen D E F Deurex MX 9820 17 D E F Licowax PED 521 GR fifteen E F Kahlwax 6607 (Sunflower) fourteen F

Several flavor delivery systems are formed as follows: first, the flavor is cooled by spraying a first wax material to form a core, and then the core is cooled by spraying a second wax material to form an encapsulated core or flavor delivery system. Table 3 presents the results of the materials after sieving.

TABLE 3 Example No. Core Shell Aromatic loading Fraction after sieving one ceridust 3610 (polyethylene wax) Revel a 25% 63–125 microns 2 ceridust 3610 (polyethylene wax) Revel a 25% 125–250 microns 3 ceridust 3610 (polyethylene wax) Revel a 35% 63–125 microns four ceridust 3610 (polyethylene wax) Revel a 35% 125–250 microns 5 ceridust 3610 (polyethylene wax) Sunflower wax 25% 63–125 microns 6 ceridust 3610 (polyethylene wax) Sunflower wax 25% 125–250 microns

These samples were then analyzed for particle size distribution, bulk density, and morphology.

Particle size distribution is measured by laser diffraction using a Malvern Mastersizer 2000. The Hydro MU liquid dispersion device is used to measure particles dispersed in ethanol. After dispersing the samples in ethanol, the ultrasonic bath is turned on for 3 minutes to crush the agglomerates. After 1 minute, the measurement begins. All samples are measured twice and indicate average values. The interpretation of the data is carried out according to the Fraunhofer theory.

Mastersizer crushes agglomerates using an ultrasonic bath before measuring particle size; The particle size measured by laser diffraction differs from the expected particle size of the sieved fractions. Sifting of the samples does not destroy the agglomerates and the sieved fractions actually consist of agglomerates, and not of fractions of single particles.

In FIG. 2 shows the particle size distributions of core-shell samples from Examples 1–6 formed as a result of the double spray cooling process described above.

The bulk density of core-shell samples of Examples 1-6 is measured according to DIN ISO 697. FIG. 3 shows bulk densities. In FIG. Figures 4–6 show the images obtained by a scanning electron microscope (SEM), example 1 (Revel A + 10% C3610 –25% aroma – 63–125 μm). In FIG. 4 presents an overview of the particles of example 1. Almost all particles have a spherical shape. In FIG. 5 shows an enlarged image of an agglomerate. Large particles indicate particles with double encapsulation and small particles indicate a single layer of encapsulation. In FIG. 6 shows an enlarged image of one particle with a size of approximately 80 microns. The surface is very smooth and does not contain capillaries or holes.

The release of aroma from the aroma delivery system was then evaluated. The aroma delivery system described herein, which was formed by two-stage spray cooling, was added to the suspension to form the reconstituted tobacco sheet as a tobacco substrate at a concentration of 3% (w / w). The reconstituted tobacco sheet was obtained according to the traditional procedure for forming such a sheet, including a drying step at a temperature of about 100 ° C. In the manufacturing process of the reconstituted tobacco sheet, no particular observations were made regarding the absence of loss or low loss of flavoring substance. Using the formed molded sheet, consumables (tobacco sticks) were made for use in an aerosol generating substrate.

The aroma release was analyzed according to the intensive smoking reference regimen according to the Canadian Department of Health. The following two examples describe the successful release of flavoring ingredients with the described flavor delivery system. For both examples, quantified flavoring ingredients cannot be detected in the aerosol consumable without the addition of the flavor delivery system described herein.

The quantified release of the 3-ethylphenol flavoring agent using a Revel A / ceridust combination (35%) with a particle size of 63-125 μm (see Example 3) in the shaped sheet of the consumable was about 14 ng per 12 Intensive regime puffs according to Canada Department of Health.

The quantified release of the pyrazine flavoring agent using a combination of sunflower / ceridust wax (25%) with a particle size of 63-125 μm (see Example 5) in the shaped sheet of the consumable was approximately 18 ng per 12 puffs intensive care according to the Department of Health Canada.

Claims (19)

1. A smoking composition comprising tobacco material and an aroma delivery system, the aroma delivery system comprising: an aromatic substance and a first waxy core material; and a second wax material surrounding the core and forming an encapsulated aroma particle, the second wax material being a wax material different from the first wax material. 2. A smoking composition according to claim 1, characterized in that the first wax material has a melting point of about 100 ° C or higher. 3. The smoking composition according to claim 1, characterized in that the second wax material has a melting point lower than the melting temperature of the first wax material. 4. Composition for smoking according to any one of paragraphs. 1-3, characterized in that the aromatic substance is a hydrophobic liquid. 5. Composition for smoking according to any one of paragraphs. 1-3, characterized in that the aromatic substance is captured or dispersed in the matrix of the first wax material. 6. Composition for smoking according to any one of paragraphs. 1-3, characterized in that the particle with an encapsulated aroma has a particle size in the range from about 25 micrometers to about 250 micrometers. 7. Composition for smoking according to any one of paragraphs. 1-3, characterized in that the tobacco material contains homogenized tobacco. 8. Composition for smoking according to any one of paragraphs. 1-3, characterized in that the tobacco material contains a reconstituted tobacco sheet. 9. Composition for smoking according to any one of paragraphs. 1-3, characterized in that at least part of the second wax material during melting is separated from the core and dispersed inside the tobacco material. 10. A smoking article containing an aerosol generating substrate that contains a smoking composition according to any one of claims. 1-9. 11. The method of forming a composition for smoking according to any one of paragraphs. 1-9, comprising the steps of: combining tobacco material with a flavor delivery system to form a tobacco blend; and heating the tobacco mixture to form a composition for smoking. 12. The method according to p. 11, characterized in that the tobacco material contains homogenized tobacco and water and at the stage of heating remove at least part of the water from the tobacco mixture to form a composition for smoking. 13. The method according to p. 11, characterized in that at the stage of heating melt at least part of the second wax material. 14. The method according to p. 13, characterized in that at the stage of heating the first wax material is not melted. 15. The use of the composition for smoking according to any one of paragraphs. 1-9 to replace or improve tobacco flavor notes.

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