DOUBLE PAPER-WRAPLED AEROSOL GENERATING SUBSTRATE ELEMENT

Abstract

An aerosol-generating substrate element is enclosed by exactly two layers of paper that do not extend beyond the aerosol-generating substrate. The aerosol-generating substrate includes approximately 10% to approximately 30% glycerin by weight. The first and second paper wrappers have a combined thickness ranging from approximately 60 micrometers to approximately 200 micrometers. The first paper wrapper does not overlap itself, and the second paper wrapper does not overlap itself.

Description

DOUBLE PAPER-WRAPLED AEROSOL GENERATING SUBSTRATE ELEMENT This description refers to double paper wrappers used in an aerosol-generating substrate element. An aerosol-generating substrate is enclosed by exactly two layers of paper wrapper to form the aerosol-generating substrate element. Aerosol-generating articles are known in the art in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated rather than burned. Typically, in such heated aerosol-generating articles, an aerosol is generated by heat transfer from a heat source to a physically separate aerosol-generating material or substrate, which may be located in contact with, within, around, or downstream of the heat source. During use of the aerosol-generating article, volatile compounds are released from the aerosol-generating substrate by heat transfer from the heat source and are carried in the air drawn through the article. As the released compounds cool, they condense to form an aerosol. The paper used to wrap the aerosol-generating substrate and form the aerosol-generating element can absorb aerosol former, water, and other liquid compounds found in conventional smoke or aerosol passing through the aerosol-generating article, or the moisture or hydration surrounding the paper. The absorbed liquid can stain or weaken the paper and negatively affect the appearance and structural integrity of the aerosol-generating article. Heated aerosol-generating articles are particularly susceptible to wetting and breakage due to the high levels of aerosol former in the aerosol-generating substrate of these heated aerosol-generating articles. Heated aerosol generating articles are particularly susceptible to swelling as the aerosol components are absorbed by the casing, leading to difficult removal of the heating device. A resistive heating blade can be inserted into the aerosol generating substrate to heat it and release volatile compounds. The resistive heating blade can provide a localized heat source within the substrate, positioned along its central axis. However, the area around the periphery or interface with the paper wrapper may not be sufficiently heated by the centrally located resistive heating blade, resulting in unused aerosol generating substrate within the aerosol generating element. It would be advisable to provide a visually and mechanically stable aerosol-generating substrate element, particularly for non-combustible heated aerosol-generating substrates containing a high level of liquids or aerosol formers. It would also be desirable for this thick paper layer not to affect the taste of the aerosol generated by the aerosol-generating substrate element. It would be desirable to provide an aerosol-generating substrate element that reduces the amount of unused aerosol-generating substrate within the aerosol-generating element. It would be desirable for this wrapping not to burn easily if it is brought near a heating element and not to negatively affect the heating of the substrate generating the non-combustion heating aerosol. A purpose of the invention may be to solve at least partially one or more of the convenient technical benefits mentioned above. LCfrQnn / zznz / E / YiAi According to this description, an aerosol-generating substrate element is provided, comprising a cylindrical aerosol-generating substrate and a first paper wrapper and a second paper wrapper circumscribing the aerosol-forming substrate. The first paper wrapper and the second paper wrapper have a combined thickness in the range of approximately 60 micrometers to approximately 200 micrometers. The first paper wrapper and the second paper wrapper do not extend beyond the aerosol-generating substrate. The first paper wrapper does not overlap itself, and the second paper wrapper does not overlap itself. Preferably, an aerosol-generating substrate element comprising a cylindrical aerosol-generating substrate and a first paper wrapper and a second paper wrapper enclosing the aerosol-forming substrate. The cylindrical aerosol-generating substrate includes from approximately 10% to approximately 30% glycerin by weight. The first paper wrapper and the second paper wrapper have a combined thickness in the range of approximately 60 micrometers to approximately 200 micrometers. The first paper wrapper and the second paper wrapper do not extend beyond the aerosol-generating substrate. The first paper wrapper does not overlap itself, and the second paper wrapper does not overlap itself. According to this description, an aerosol-generating substrate element is provided, comprising a cylindrical aerosol-generating substrate, a first paper wrapper, and a second paper wrapper enclosing the first paper wrapper. The first paper wrapper comprises opposite edges that meet to enclose the aerosol-forming substrate and form a first bonding line. The second paper wrapper comprises opposite edges that meet to enclose the first paper wrapper and form a second bonding line. The first bonding line is offset from the LCfrQnn / zznz / E / YiAi second bond line. The first paper wrap and the second paper wrap do not extend beyond the aerosol generating substrate. Preferably, the first bond line is offset from the second bond line by at least approximately 5%, or at least approximately 10%, or at least approximately 15% of a circumference of the aerosol-generating substrate. Preferably, the aerosol generating substrate is circumscribed by fewer than three layers of paper at any point around a circumference of the aerosol generating substrate that do not extend beyond the aerosol generating substrate. The first and second paper wrappings may have a combined thickness ranging from approximately 78 micrometers to approximately 160 micrometers. The first and second paper wrappings may have a combined thickness ranging from approximately 78 micrometers to approximately 140 micrometers. The first and second paper wrappings may have a combined thickness ranging from approximately 90 micrometers to approximately 140 micrometers. The first and second paper wrappings may have a combined thickness ranging from approximately 100 micrometers to approximately 140 micrometers. The first and second paper wrappings may have a combined thickness ranging from approximately 110 micrometers to approximately 140 micrometers.The first and second paper wrappings can have a combined thickness in the range of approximately 125 micrometers to approximately 140 micrometers. The first and second paper wrappings can have a combined thickness in the range of approximately 130 micrometers to approximately 140 micrometers. The first paper wrapping and the second paper wrapping can have a uniform combined thickness that does not differ at any point around a circumference of the item LCfrQnn / zznz / E / YiAi of aerosol generating substrate by more than approximately 30 micrometers, or more than approximately 20 micrometers, or more than approximately 10 micrometers, or more than approximately 5 micrometers. The aerosol generating substrate can define a substantially cylindrical shape having a diameter in the range of approximately 6.8 mm to approximately 7.1 mm or from approximately 6.8 mm to approximately 7.0 mm. The first and second paper wrappers may have a combined thickness-to-tobacco substrate diameter ratio in the range of approximately 1:120 to approximately 1:40. The first and second paper wrappers may have a combined thickness-to-tobacco substrate diameter ratio in the range of approximately 1:100 to approximately 1:50. The first and second paper wrappers may have a combined thickness-to-tobacco substrate diameter ratio in the range of approximately 1:70 to approximately 1:50. The first and second paper wrappers may have a combined thickness-to-tobacco substrate diameter ratio in the range of approximately 1:60 to approximately 1:50. The aerosol-generating substrate may include homogenized tobacco material. The homogenized tobacco material may include tobacco material, from approximately 1 percent to approximately 5 percent of a binder, and from approximately 5 percent to approximately 30 percent of an aerosol former, on a dry weight basis. The aerosol-generating substrate may include a crinkled sheet of homogenized tobacco material that is preferably curled. Preferably, the aerosol-generating substrate may include homogenized tobacco material. The homogenized tobacco material may include tobacco material, from approximately 1 percent to approximately 5 percent of a binder, and LCfrQnn / zznz / E / YiAi approximately 10 percent to approximately 30 percent glygerin, on a dry weight basis. The aerosol-generating substrate may include a crinkled sheet of homogenized tobacco material that is preferably curled. The aerosol generating substrate may include a metallic induction heating element. The aerosol generating substrate may include a plurality of metallic induction heating elements. In accordance with the present description, an aerosol generating system is provided comprising the aerosol generating article described herein, and an aerosol generating device comprising a heating element configured to heat the aerosol generating substrate. The heating element can be a resistive heating blade element configured to be inserted into the aerosol generating substrate. Alternatively, the heating element can be an inductive heating element configured to inductively heat metallic induction heating elements embedded within the aerosol generating substrate. Advantageously, aerosol-generating substrate elements that include a double wrapping of thick paper can provide a visually and mechanically stable aerosol-generating substrate element, particularly for non-combustion heating aerosol-generating substrates containing a high level of liquids or aerosol formers. As a result, swelling, visible staining, and physical weakening of the wrapping portion of the aerosol-generating article can be reduced, even when a high level of wetting agent is included in the aerosol-generating substrate. Advantageously, aerosol-generating substrate elements that include a double wrapping of thick paper can be formed on top of the conventional substrate element. LCfrQnn / zznz / E / YiAi, which forms the manufacturing team. This can improve the processability of aerosol-generating substrate elements and reduce manufacturing costs. Advantageously, aerosol generating substrate elements that include a double wrapping of thick paper can increase the amount of aerosol generating substrate that is heated and consumed evenly, thereby reducing unused or wasted aerosol generating substrate material. Advantageously, aerosol generating substrate elements that include a double wrapping of thick paper can utilize internal heating of the aerosol generating substrate through induction or resistive heating elements incorporated or inserted into the aerosol generating substrate, and the double wrapping of thick paper that encloses the aerosol generating substrate may not negatively affect the heating of the non-combustion heated aerosol generating substrate. A conventional cigarette is lit when a user applies a flame to one end and inhales through the other. The localized heat from the flame and the oxygen in the inhaled air ignites the end, and the resulting combustion produces inhalable smoke. In contrast, heated aerosol-generating articles generate an aerosol by heating a flavor-forming substrate, such as tobacco. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles and aerosol-generating articles in which an aerosol is generated by transferring heat from a fuel element or heat source to a physically separated aerosol-forming substrate.For example, aerosol generating articles as described find particular application in aerosol generating systems comprising an electrically heated aerosol generating device having an internal heating plate adapted for insertion into the aerosol generating substrate bar. LCfrQnn / zznz / E / YiAi aerosol generators of this type are described in the prior art, for example, in document EP 0822670. As used in the present description, the term “aerosol generating device” refers to a device comprising a heating element that interacts with the aerosol generating substrate of an aerosol generating article to generate an aerosol. As used in the present description, the expression “aerosol generating system” refers to a combination of an aerosol generating device and an aerosol generating article. As used in the present description, the term aerosol generating article refers to an article that includes an aerosol generating substrate that is heated to produce and deliver an inhalable aerosol to a consumer. The term “aerosol generating substrate element” is used in this description to denote an aerosol generating substrate wrapped with a paper layer to form a portion of an aerosol generating article. The term “aerosol-generating substrate” refers to a substance capable of generating or releasing an aerosol. The aerosol-generating substrate may be a solid, paste, gel, suspension, liquid, or comprise any combination of solid, paste, gel, suspension, and liquid compounds. Preferably, the aerosol-generating substrate is a solid or gel composition. The aerosol-generating substrate may, preferably, include nicotine. The term “nozzle” is used in this description to refer to the portion of the aerosol-generating article designed to come into contact with the consumer’s mouth. The nozzle may be the portion of the aerosol-generating article that includes a filter, or in some cases, the nozzle may be defined by the extent of the nozzle wrap. LCfrQnn / zznz / E / YiAi The terms “upstream” and “downstream” refer to the relative positions of elements of the described aerosol-generating article in relation to the aerosol direction when drawn from an aerosol-generating substrate and through the nozzle. The aerosol-generating substrate elements of the present invention include an aerosol-generating substrate wrapped with a double layer of thick paper. The aerosol-generating substrate element includes an aerosol-generating substrate and at least two layers of paper surrounding the aerosol-generating substrate. The aerosol-generating substrate element includes a cylindrical aerosol-generating substrate element and a first and second paper wrapper that circumscribe the aerosol-forming substrate. The first and second paper wrappers have a combined thickness ranging from approximately 60 micrometers to approximately 200 micrometers. The first and second paper wrappers do not extend beyond the aerosol-generating substrate. The first and second paper wrappers do not overlap. The aerosol-generating substrate element includes a cylindrical aerosol-generating substrate, a first paper wrapper, and a second paper wrapper. The first paper wrapper comprises opposite edges that meet to circumscribe the aerosol-forming substrate and form a first bonding line. The second paper wrapper comprises opposite edges that meet to circumscribe the first paper wrapper and form a second bonding line. The first bonding line is offset from the second bonding line, and neither the first nor the second paper wrapper extends beyond the aerosol-generating substrate. Preferably, the first bond line may be offset from the second bond line by at least approximately 5% of the circumference of the aerosol-generating substrate. LCfrQnn / zznz / E / YiAi bonding in at least approximately 10% of a circumference of the aerosol-generating substrate. Preferably, the first bonding line may be offset from the second bonding line by at least approximately 15% of a circumference of the aerosol-generating substrate. The joining line may define a space or gap that is less than 10 micrometers in the lateral dimension, or less than 5 micrometers in the lateral dimension, or less than 2 micrometers in the lateral dimension. Preferably, the joining line does not define a space. Preferably, the opposite edges of the paper layer abut each other without overlapping. Preferably, the opposite edges of the paper layer come into contact with each other without overlapping. Preferably, the first bond line may be offset from the second bond line by a range of approximately 5% to approximately 20% of the circumference of the aerosol-generating substrate. Preferably, the first bond line may be offset from the second bond line by a range of approximately 5% to approximately 15% of the circumference of the aerosol-generating substrate. Preferably, the first bond line may be offset from the second bond line by a range of approximately 10% to approximately 20% of the circumference of the aerosol-generating substrate. The first bond line may be parallel to the second bond line. The first bond line may extend along the entire length of the aerosol-generating substrate. The second bond line may extend along the entire length of the aerosol-generating substrate. The first bond line may be parallel to the second bond line along the entire length of the aerosol-generating substrate. The aerosol-generating substrate may be enclosed by fewer than three layers of paper at any point around a circumference of the aerosol-generating substrate that is not LCfrQnn / zznz / E / YiAi extend beyond the aerosol-generating substrate. The aerosol-generating substrate may be enclosed by fewer than three layers of paper at any point along a length of the aerosol-generating substrate that does not extend beyond the aerosol-generating substrate. Preferably, the aerosol-generating substrate may be enclosed by fewer than three layers of paper at any point around a circumference, and at any point along a length of the aerosol-generating substrate that does not extend beyond the aerosol-generating substrate. The combined thickness of the first and second paper wrappings ranges from approximately 60 micrometers to approximately 200 micrometers. Preferably, the combined thickness of the first and second paper wrappings ranges from approximately 78 micrometers to approximately 160 micrometers. Preferably, the combined thickness of the first and second paper wrappings ranges from approximately 78 micrometers to approximately 140 micrometers. Preferably, the combined thickness of the first and second paper wrappings ranges from approximately 90 micrometers to approximately 140 micrometers. Preferably, the combined thickness of the first and second paper wrappings ranges from approximately 100 micrometers to approximately 140 micrometers.Preferably, the combined thickness of the first and second paper wrappings is in the range of approximately 110 micrometers to approximately 140 micrometers. Preferably, the combined thickness of the first and second paper wrappings is in the range of approximately 125 micrometers to approximately 140 micrometers. Preferably, the combined thickness of the first and second paper wrappings is in the range of approximately 130 micrometers to approximately 140 micrometers. LCfrQnn / zznz / E / YiAi The first paper wrapping can have a thickness ranging from approximately 25 micrometers to approximately 175 micrometers. The first paper wrapping can have a thickness ranging from approximately 50 micrometers to approximately 150 micrometers. The first paper wrapping can have a thickness ranging from approximately 75 micrometers to approximately 125 micrometers. The first paper wrapping can have a thickness ranging from approximately 100 micrometers to approximately 140 micrometers. The second paper wrapping can have a thickness ranging from approximately 25 micrometers to approximately 175 micrometers. The second paper wrapping can have a thickness ranging from approximately 50 micrometers to approximately 150 micrometers. The second paper wrapping can have a thickness ranging from approximately 75 micrometers to approximately 125 micrometers. The second paper wrapping can have a thickness ranging from approximately 100 micrometers to approximately 140 micrometers. The first and second paper wrappers can be substantially the same thickness. The first paper wrapper can be thicker than the second paper wrapper. The second paper wrapper can be thicker than the first paper wrapper. The first paper wrapper can be affixed to the second paper wrapper. The first paper wrapper can be adhered to the second paper wrapper. The first paper wrapper can be adhered to the second paper wrapper with an adhesive material. The adhesive material can have a thickness ranging from approximately 1 micrometer to approximately 30 micrometers, or from approximately 5 micrometers to approximately 25 micrometers, or from approximately 10 micrometers to approximately 25 micrometers. The adhesive material can be applied uniformly to the first and second paper wrappers. LCfrQnn / zznz / E / YiAi paper wrapping. The adhesive material can separate the first paper wrapping from the second paper wrapping. The first paper wrapper and the second paper wrapper may have a uniform combined thickness that does not differ at any point around a circumference of the aerosol-generating substrate element by more than approximately 30 micrometers. Preferably, the first paper wrapper and the second paper wrapper may have a uniform combined thickness that does not differ at any point around a circumference of the aerosol-generating substrate element by more than approximately 20 micrometers. Preferably, the first paper wrapper and the second paper wrapper may have a uniform combined thickness that does not differ at any point around a circumference of the aerosol-generating substrate element by more than approximately 10 micrometers.Preferably, the first paper wrapper and the second paper wrapper can have a uniform combined thickness that does not differ at any point around a circumference of the aerosol-generating substrate element by more than approximately 5 micrometers. The first paper wrapper may not extend beyond either end of the aerosol-generating substrate. The second paper wrapper may not extend beyond either end of the aerosol-generating substrate. The first and second paper wrappers may not extend beyond either end of the aerosol-generating substrate. The aerosol-generating substrate element includes a cylindrical aerosol-generating substrate, a first paper wrapper, and a second paper wrapper. The first paper wrapper comprises opposite edges that meet to circumscribe the aerosol-forming substrate and form a first bond line, wherein the first paper wrapper does not overlap or cover itself. The second paper wrapper comprises opposite edges that meet to circumscribe the first paper wrapper and form a LCfrQnn / zznz / E / YiAi Second bond line where the first paper wrap does not overlap or cover itself. The first bond line is offset from the second bond line, and neither the first nor the second paper wrap extends beyond the spray-generating substrate. Reducing overlap or covering of the paper wrap can help prevent or minimize voids or defined air pockets between the paper layers. The first and second paper wraps may not extend beyond the ends of the aerosol-generating substrate. Preferably, the first and second paper wraps enclose an entire length of the aerosol-generating substrate between the ends of the aerosol-generating substrate. Preferably, the first and second paper wraps enclose an entire length of the aerosol-generating substrate between the ends of the aerosol-generating substrate and do not extend beyond one or both ends of the aerosol-generating substrate. The first and second paper wrappers may enclose the aerosol-generating substrate to define the aerosol-generating substrate element with a substantially cylindrical shape. The aerosol-generating substrate may define a substantially cylindrical shape having a diameter in the range of approximately 6.8 mm to approximately 7.1 mm or from approximately 6.8 mm to approximately 7.0 mm. The aerosol-generating substrate element may define a substantially cylindrical shape having a diameter in the range of approximately 7.1 mm to approximately 7.3 mm, or from approximately 7.15 mm to approximately 7.25 mm. The first and second paper wrappers have a combined paper thickness to tobacco substrate diameter ratio in the range of approximately 1:120 to approximately 1:40, or approximately 1:100 to approximately 1:50, or approximately 1:70 to approximately 1:50, or approximately 1:60 to approximately 1:50. Conventionally wrapped tobacco substrates may LCfrQnn / zznz / E / YiAi have a paper thickness to tobacco substrate diameter ratio of approximately 1:300. The first paper wrapper and the second paper wrapper have a combined paper thickness to tobacco substrate element diameter ratio in the range of approximately 1:100 to approximately 1:40, or approximately 1:75 to approximately 1:50, or approximately 1:65 to approximately 1:50, or approximately 1:60 to approximately 1:50. Conventionally wrapped tobacco substrates may have a paper thickness to tobacco substrate element diameter ratio of approximately 1:300. The aerosol-generating substrate element preferably includes an aerosol-generating substrate having a diameter in the range of approximately 6.8 mm to approximately 7.1 mm and a combined paper thickness of a first paper wrapper and a second paper wrapper in the range of approximately 78 micrometers to 160 micrometers surrounding the aerosol-generating substrate. The first and second paper wrappers do not overlap each other. Preferably, the first and second paper wrappers do not extend beyond the ends of the aerosol-generating substrate. Preferably, the first and second paper wrappers surround the entire length of the aerosol-generating substrate. An aerosol-generating article may comprise an aerosol-generating substrate and a nozzle. The nozzle may comprise a filter. A nozzle housing may attach the filter to the aerosol-generating substrate. One or more intermediate sections may separate the aerosol-generating substrate and a nozzle. The tip wrap can be attached to either the first or second paper wrap. Preferably, the tip wrap extends from the nozzle or filter segment to the aerosol-generating substrate element. The tip paper extends from the nozzle or filter segment to the aerosol-generating substrate element and makes contact with and adheres to the second outer surface of the paper wrap. The tip paper preferably extends over only a portion downstream of the aerosol-generating substrate element. The tip wrap may cover 25% or less downstream of the aerosol-generating substrate element. An aerosol-generating substrate may be a solid composition. This composition may include plant-based material. The aerosol-generating substrate may include tobacco, and preferably the tobacco contains volatile tobacco-flavored compounds that are released from the aerosol-generating substrate upon heating. The aerosol-generating substrate may comprise homogenized tobacco material, an aerosol former, and a binder. Nicotine may be present in the aerosol-generating substrate in a range of approximately 0.5 to approximately 10% by weight, or approximately 0.5 to approximately 5% by weight. Preferably, the aerosol-generating substrate may include approximately 1% to approximately 3% by weight, or approximately 1.5% to approximately 2.5% by weight, or approximately 2% by weight. The aerosol-generating substrate may comprise any suitable type or types of tobacco or tobacco substitute material, in any suitable form. The aerosol-generating substrate may include artificial atmosphere-cured tobacco, Burley tobacco, Maryland tobacco, Oriental tobacco, specialty tobacco, homogenized or reconstituted tobacco, or any combination thereof. The aerosol-generating substrate may be provided in the form of tobacco chips, tobacco foil, processed tobacco materials such as volume-expanded or inflated tobacco, processed tobacco stalks such as rolled cut stalks or inflated cut stalks, homogenized tobacco, reconstituted tobacco, molded leaf tobacco, or mixtures thereof, and the like. The term “tobacco chips” is used in this description. LCfrQnn / zznz / E / YiAi to indicate a tobacco material that is formed predominantly from the lamina portion of the tobacco leaf. The term “tobacco chip” is used herein to indicate either a single species of Nicotiana or two or more species of Nicotiana forming a tobacco chip mixture. As used in this description, the term “homogenized tobacco” denotes a material formed by agglomerating particulate tobacco. Homogenized tobacco may include reconstituted tobacco or molded-leaf tobacco, or a mixture of both. The term “reconstituted tobacco” refers to a paper-like material that can be manufactured from tobacco by-products, such as very short tobacco fibers, tobacco dust, tobacco stalks, or a mixture thereof. Reconstituted tobacco can be manufactured by extracting soluble chemicals from tobacco by-products, processing the remaining tobacco fibers into a sheet, and then reapplying the extracted materials in concentrated form to the sheet.The term “molded leaf tobacco” is used herein to refer to a product resulting from a process well known in the art, which involves pouring a suspension comprising ground tobacco particles and a binder (e.g., guar) onto a support surface, such as a conveyor belt, drying the suspension, and removing the dried sheet from the support surface. Illustrative methods for producing these types of aerosol-generating substrates are described in U.S. Patents 5,724,998; 5,584,306; 4,341,228; 5,584,306; and 6,216,706. The homogenized tobacco may be formed into a sheet that is curled, twisted, folded, or otherwise compressed before being wound into a stick. For example, sheets of homogenized tobacco material for use in the invention can be curled by using a curling unit of the type described in CH-A-691156, comprising a pair of rotating curling rollers.However, it will be appreciated that the sheets of homogenized tobacco material for use in the invention can be textured by using another. LCfrQnn / zznz / E / YiAi suitable machinery and processes that deform or perforate sheets of homogenized tobacco material. The aerosol-generating substrate used in aerosol-generating articles generally includes a higher level of aerosol formers than burned smoking articles, such as cigarettes. Humectants may also be referred to as an “aerosol former.” An aerosol former is used to describe any suitable known compound or mixture of compounds that, during use, facilitates the formation of an aerosol and is essentially resistant to thermal degradation at the operating temperature of the aerosol-generating substrate. Suitable aerosol formers are well known in the art and include, but are not limited to: polyhydric alcohols, such as propylene glycol, triethylene glycol, 1.3-butanediol and glycerin; esters of polyhydric alcohols, such as glyceryl monoacetate, dicetate, or triacetate; and aliphatic esters of monocarboxylic, dicarboxylic, or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred aerosol formers are polyhydric alcohols or mixtures thereof, such as propylene glycol, triethylene glycol, 1,3-butanediol, and, most preferably, glycerin. The aerosol-generating substrate may comprise a single aerosol former. Alternatively, the aerosol-generating substrate may comprise a combination of two or more aerosol formers. The aerosol-generating substrate may have a high level of aerosol former. As used herein, a high level of aerosol former means an aerosol former content that is greater than approximately 10%, or preferably greater than approximately 15%, or more preferably greater than approximately 20%, by weight. The aerosol-generating substrate may also have an aerosol former content of between approximately 10% and approximately 30%, approximately 15% and approximately 30%, or approximately 20% and approximately 30%, by weight. LCfrQnn / zznz / E / YiAi aerosol generating substrate may also have a glycerin content of between approximately 10% and approximately 30%, approximately 15% and approximately 30%, or approximately 20% and approximately 30%, by weight. The aerosol-generating substrate may comprise at least approximately 1%, or at least approximately 2%, or at least approximately 5%, or at least approximately 7%, or at least approximately 10%, or at least approximately 12%, or at least approximately 15%, or at least approximately 18% aerosol former, by weight. The aerosol-generating substrate may comprise an aerosol former in the range of approximately 1% to approximately 20%, or approximately 5% to approximately 20%, or approximately 10% to approximately 20%, by weight. The aerosol-generating substrate may comprise at least approximately 1%, or at least approximately 2%, or at least approximately 5%, or at least approximately 7%, or at least approximately 10%, or at least approximately 12%, or at least approximately 15%, or at least approximately 18% glycerin, by weight. The aerosol-generating substrate may comprise glycerin in the range of approximately 1% to approximately 20%, or approximately 5% to approximately 20%, or approximately 10% to approximately 20%, by weight. Preferably, the aerosol-generating article should generally be cylindrical. This allows for a smooth flow of the aerosol. The aerosol-generating article may have an outer diameter, for example, between 7.1 mm and 7.3 mm, or between 7.15 mm and 7.25 mm. The aerosol-generating article may have a length, for example, between 10 mm and 60 mm, between 15 mm and 50 mm, or between 20 mm and 45 mm. The aerosol-generating substrate may include a flavoring. Botanical materials provide a flavoring that can impart a taste to the aerosol generated by the aerosol-generating item. A flavoring is any natural or artificial compound that LCfronn / zznz / E / YiAi affects the organoleptic quality of the aerosol. Non-limiting examples of flavoring sources include mints such as spearmint and peppermint, coffee, tea, cinnamon, clove, cocoa, vanilla, eucalyptus, geranium, agave, and juniper; and combinations thereof. The aerosol-generating substrate may include an essential oil. Essential oils can provide a flavoring that imparts a taste to the aerosol generated by the aerosol-generating device. Suitable essential oils include, but are not limited to, eugenol, peppermint oil, and spearmint oil. A preferred essential oil is eugenol. The essential oil may be present in the aerosol-generating substrate in an amount of at least approximately 0.1% by weight, or at least approximately 0.5% by weight, or at least approximately 1% by weight. The essential oil may be present in the aerosol-generating substrate in a range of approximately 0.1% by weight to approximately 10% by weight, or from approximately 0.1% by weight to approximately 5% by weight, or from approximately 0.5% by weight to approximately 2%. The aerosol-generating substrate may include homogenized tobacco material. The homogenized tobacco material may include tobacco material, approximately 1 percent to approximately 5 percent of a binder, and approximately 5 percent to approximately 30 percent of an aerosol former, on a dry weight basis. The aerosol-generating substrate may include homogenized tobacco material. The homogenized tobacco material may include tobacco material, approximately 1 percent to approximately 5 percent of a binder, and approximately 10 percent to approximately 30 percent of glycerin, on a dry weight basis. The homogenized tobacco sheets for use in the aerosol generating article of the present invention can be made by methods known in the art, for example, the methods described in International Patent Application WO-A-201 2 / 1 64009 A2. In a preferred embodiment, the sheets of homogenized tobacco material for use in the LCfrQnn / zznz / E / YiAi aerosol generating article is formed from a suspension comprising particulate tobacco, guar gum, cellulose fibers and glycerin by a casting process. The aerosol-generating substrate may include a crinkled sheet of homogenized tobacco material that is preferably crimped. As used herein, the term “crimped” refers to a sheet having a plurality of substantially parallel ridges or corrugations. Preferably, when the aerosol-generating article has been assembled, the essentially parallel ridges or corrugations extend along, or are parallel to, the longitudinal axis of the aerosol-generating article. An aerosol generating system may comprise: an aerosol generating article comprising the aerosol generating substrate element, as described herein, attached to a filter element, and an aerosol generating device comprising a heating element configured to heat the aerosol generating substrate element. The heating element can be integrated with an aerosol generating device and a consumable aerosol generating item can be freely received within the aerosol generating device. The heating element can be a combustible heat source, a chemical heat source, an electrical heat source, a heat sink, or any combination thereof. Preferably, the heat source is an electrical heat source, preferably in the form of a blade that can be inserted into the aerosol-generating substrate. Alternatively, the heat source can be configured to surround the aerosol-generating substrate, and as such, it can be in the form of a hollow cylinder or any other suitable shape. Preferably, the heating element is configured to heat the aerosol generating substrate directly without transmitting heat to the aerosol generating substrate through the first or second paper wrapper. LCfrQnn / zznz / E / YiAi The aerosol-generating substrate may include one or more induction heating elements or susceptors. Induction heating elements or susceptors are heated in the presence of an alternating or fluctuating electromagnetic field. When heating is by induction, a fluctuating electromagnetic field is transmitted through the aerosol-generating article to the induction heating element or susceptor, causing the susceptor or induced heating element to convert the fluctuating field into thermal energy, thereby heating the aerosol-generating substrate. The induction heating element or susceptor can be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-generating substrate. The induction heating element or susceptor can comprise a metal or carbon. A preferred induction heating element or susceptor can comprise a ferromagnetic material, for example, ferritic iron, or a ferromagnetic steel or stainless steel. The induction heating element or susceptor can comprise aluminum. The induction heating element or susceptor can be formed from 400 series stainless steels, for example, grade 410, grade 420, or grade 430 stainless steel. Different materials will dissipate different amounts of energy when placed within electromagnetic fields that have similar values ​​of frequency and field strength.Preferably, the induction heating element or susceptors are heated to a temperature above 250 degrees Celsius. However, preferably the induction heating element or susceptors are heated to less than 350 degrees Celsius to prevent burning the material in contact with the susceptor. The aerosol-generating substrate may comprise a metallic induction heating element. The metallic induction heating element may comprise multiple metallic induction heating elements. The heating element LCfrQnn / zznz / E / YiAi metallic induction may comprise a metallic induction heating ring element. This first paper wrapper may exhibit a permeability range that includes being non-permeable. The permeability of cigarette paper is determined using the international standard test method ISO 2965:2009, and the result is presented as cubic centimeters per minute per square centimeter and is referred to as “CORESTA units.” The permeability of the first paper wrapper described herein is in the range of approximately 1 to approximately 10 CORESTA units, approximately 5 to approximately 20 CORESTA units, or approximately 1 to approximately 5 CORESTA units. The first layer of paper wrapping can be made of any cellulosic material such as paper, wood, textile, natural and artificial fibers. This second paper wrapper may exhibit a permeability range that includes being non-permeable. The permeability of cigarette paper is determined using the international standard test method ISO 2965:2009, and the result is presented as cubic centimeters per minute per square centimeter and is referred to as “CORESTA units.” The permeability of the second paper wrapper described herein is in the range of approximately 1 to approximately 10 CORESTA units, approximately 5 to approximately 20 CORESTA units, or approximately 1 to approximately 5 CORESTA units. The second layer of paper wrapping can be made of any cellulosic material such as paper, wood, textile, natural and artificial fibers. The first or second paper layer may comprise a laminate of one layer of paper and one layer of metal. The first paper layer may comprise a laminate of one layer of paper and one layer of metal. The second paper layer may comprise a laminate LCfrQnn / zznz / E / YiAi of a paper layer and a metal layer. The first and second paper layers may comprise a laminate of a paper layer and a metal layer. The metal layer may be an aluminum layer. The first or second paper layer may comprise a laminate of one layer of paper and one layer of aluminum. The laminate of one layer of paper and one layer of aluminum may have a uniform thickness in the range of approximately 78 micrometers to approximately 160 micrometers, or from approximately 78 micrometers to approximately 140 micrometers, or from approximately 100 micrometers to approximately 140 micrometers, or from approximately 125 micrometers to approximately 140 micrometers. The laminate of one layer of paper and one layer of metal may not extend beyond the edges of the aerosol-generating substrate. The pull-out resistance (RTD) of the aerosol generating article after insertion into the aerosol generating device is preferably between approximately 80 mm WG and approximately 140 mm WG, with greater preference between approximately 100 mm WG and approximately 120 mm WG. As used in this description, pull-out resistance is expressed in pressure units 'mm WG' or 'mm of water column' and is measured in accordance with ISO 6565:2002. The pull-out resistance (RTD) of the aerosol-generating substrate bar is preferably between approximately 50 mm WG and approximately 80 mm WG. Preferably, the RTD of the aerosol-generating substrate bar is between approximately 5 mm WG and approximately 8 mm WG per millimeter of bar length. All scientific and technical terms used in this description have meanings commonly used in the art unless otherwise specified. The definitions provided in this description are to facilitate understanding of certain terms frequently used herein. LCfrQnn / zznz / E / YiAi As used in this description and the accompanying claims, the singular forms “a”, “an”, and “the” encompass examples that have plural referents, unless the content clearly indicates otherwise. As used in this description and accompanying claims, the term “or” is generally used in a sense that includes “and / or” unless the content clearly indicates otherwise. As used in this description, “has,” “which has,” “includes,” “which includes,” “comprises,” “which comprises,” or similar expressions are used in their open-ended sense and generally mean “which includes, but is not limited to.” The expressions “which essentially consists of,” “consists of,” and similar expressions are understood to be included within “which comprises” and similar expressions. The words “preferred” and “preferably” refer to examples of the invention that may achieve certain benefits under certain circumstances. However, other examples may also be preferred under the same or other circumstances. Furthermore, the enumeration of one or more preferred examples does not imply that other examples are not useful, and it is not intended to exclude other examples from the scope of the description, which includes the claims. Figure 1 is a schematic cross-section diagram of an aerosol generating article. Figure 2 is a schematic cross-section diagram of the first paper wrap and the second paper wrap before being wrapped around the aerosol generating substrate. Figure 3 is a schematic cross-section diagram of the aerosol-generating substrate element along line 3-3 in Figure 1. Figure 4 is a schematic cross-section diagram of the aerosol-generating substrate element along line 4-4 in Figure 3. LCfrQnn / zznz / E / YiAi Figure 5 is a schematic cross-section diagram of an aerosol generating system. Figure 6 is a schematic cross-section diagram of a heating blade inserted into the aerosol generating substrate element. The aerosol generating articles illustrated in Figures 1-6 illustrate one or more examples of aerosol generating articles, components of aerosol generating articles, or aerosol generating systems described above. The schematic drawings are not necessarily to scale and are presented for illustrative purposes only and are not intended to be limiting. The figures represent one or more aspects described herein. However, it is understood that other aspects not represented in the figures fall within the scope and spirit of this description. The aerosol-generating article 10, in Figure 1, illustrates an aerosol-generating substrate element 12 comprising an aerosol-generating substrate 20 wrapped with a double paper wrapper 30. An intermediate section 24 separates a filter element 22 from the aerosol-generating substrate element 12. The aerosol-generating substrate element 12, the intermediate section 24, and a filter element 22 are aligned from a distal end 13 to a proximal end 11 in serial order and form a cylinder. A tip paper or tip wrapper 40 circumscribes the aerosol-generating article 10 to join the aerosol-generating substrate element 12 to the intermediate section 24, and a filter element 22. The intermediate section 24 may comprise one or more hollow cellulose acetate tubes or polylactic acid filter segments. The filter element 22 may define a nozzle segment and be formed from cellulose acetate material. The aerosol-generating substrate element 12, the intermediate section 24, and a filter element 22 may each be individually wrapped with a paper layer and then bonded together with tip or wrapper paper. LCfrQnn / zznz / E / YiAi of tip 40. In particular, the aerosol generating substrate element 12 is wrapped with a double paper wrapper 30, as described herein. The aerosol generating article 10 has a mouth end or proximal end 11 and an upstream distal end 13, located at the opposite end of the article from the mouth end 11. The aerosol generating article 10 shown in Figure 1 is particularly suitable for use with an electrically operated aerosol generating device comprising a heater for heating the aerosol generating substrate element 12. Figure 2 is a schematic cross-sectional diagram of the first paper wrapper 31 and the second paper wrapper 32 or the double paper wrapper 30, before being wrapped around the aerosol-generating substrate 20. Figure 3 is a schematic cross-sectional diagram of the aerosol-generating substrate element 12 along line 3-3 in Figure 1. Figure 4 is a schematic cross-sectional diagram of the aerosol-generating substrate element 12 along line 4-4 in Figure 3. A first paper wrapper 31 comprises opposite edges that abut each other to circumscribe the aerosol-forming substrate 20 and form a first bonding line 35. A second paper wrapper 32 comprises opposite edges that abut each other to circumscribe the first paper wrapper 31 and form a second bonding line 34. The first bonding line 35 is offset from the second bonding line 34, and the first paper wrapper 31 and the second paper wrapper 32 do not extend beyond the aerosol-generating substrate 20 or beyond the ends 25, 26 of the aerosol-generating substrate 20. The double paper wrapping 30 circumscribes the aerosol-generating substrate 20 to define the aerosol-generating substrate element 12 with a substantially cylindrical shape. The aerosol-generating substrate 20 defines a substantially cylindrical shape having a diameter 23 in the range of approximately 6.8 mm to approximately 7.1 mm or from approximately 6.8 mm to approximately 7.0 mm. The aerosol-generating substrate element LCfrQnn / zznz / E / YiAi aerosol 12 defines a substantially cylindrical shape having a diameter 33 in a range of approximately 7.1 mm to approximately 7.3 mm, or from approximately 7.15 mm to approximately 7.25 mm. The double-ply paper wrapper 30 has a thickness T in the range of approximately 60 micrometers to approximately 200 micrometers. The double-ply paper wrapper 30 may preferably have a thickness in the range of approximately 78 micrometers to approximately 160 micrometers, or from approximately 78 micrometers to approximately 140 micrometers, or from approximately 90 micrometers to approximately 140 micrometers, or from approximately 100 micrometers to approximately 140 micrometers, or from approximately 110 micrometers to approximately 140 micrometers, or from approximately 125 micrometers to approximately 140 micrometers, or from approximately 130 micrometers to approximately 140 micrometers. The double paper wrapper 30 and has a paper thickness ratio T to tobacco substrate diameter 23 in a range of approximately 1:120 to approximately 1:40, or approximately 1:100 to approximately 1:50, or approximately 1:70 to approximately 1:50, or approximately 1:60 to approximately 1:50. The double paper wrap 30 circumscribes the entire circumference of the aerosol-generating substrate 20 without overlap of the first paper wrap 31 upon itself and without the second paper wrap 32 covering itself. The double paper wrap 30 defines fewer than three layers of paper at any point around the circumference of the aerosol-generating substrate element 12. Figure 5 is a schematic cross-sectional diagram of an aerosol generating system 201. Figure 6 is a schematic cross-sectional diagram of a heating blade 230 inserted into the aerosol generating substrate element 12. The article The LCfrQnn / zznz / E / YiAi aerosol generator 10 can be used with the aerosol generator device 200 as illustrated in Figure 5 and Figure 6. The aerosol generating device 200 includes a housing 210 that defines the receptacle 220, which is configured to receive the aerosol generating article 10. The aerosol generating device 200 also includes a heating blade element 230 configured to pierce the aerosol generating substrate element 12 of the aerosol generating article 10. The heating blade element 230 may comprise an electrically resistive heating component. In addition, the device 200 includes a power supply 240 and electronic control circuits 250 that cooperate to control the heating of the heating blade element 230. The aerosol-generating article 10 comprises an aerosol-generating substrate element 12, an intermediate section 24, and a filter element 22 aligned from a distal end 13 to a proximal end 11 in serial order and forming a cylinder. The distal end 13 of the aerosol-generating article 10 is approximately 12 millimeters long. The aerosol-generating substrate 12 is cylindrical in shape and has an essentially circular cross-section. The aerosol-generating substrate 12 may comprise a crinkled sheet of homogenized tobacco material. The sheet of homogenized tobacco material may comprise approximately 10 percent by weight on a dry basis of glycerin. The intermediate section 24 may be a hollow cellulose acetate tube having a length of approximately 8 millimeters and a thickness of 1 millimeter.The nozzle segment or filter element 22 may comprise an 8 denier cellulose acetate tow plug per filament and has a length of approximately 7 millimeters. Figure 6 illustrates the heating blade element 230 arranged within the aerosol generating substrate 12. The heating blade element 230 can heat the aerosol generating substrate 12, 20 of the aerosol generating article 10. Heating the substrate LCfrQnn / zznz / E / YiAi aerosol generator 12 causes the aerosol generator substrate 12 to generate an aerosol containing nicotine that can be transferred out of the aerosol generator article 10 at the proximal end 11. The heating blade element 230 may have a width 233 of approximately 5 mm. The aerosol generating substrate 20 defines a substantially cylindrical shape having a diameter 23 in the range of approximately 6.8 mm to approximately 7.1 mm. The aerosol generating substrate element 12 defines a substantially cylindrical shape having a diameter 33 in the range of approximately 7.1 mm to approximately 7.3 mm. The heating blade element 230 may be located within approximately 1 mm of the double paper wrapper 30. In some examples the heating mechanism may be by induction, where the heating element emits radiomagnetic radiation that is absorbed by one or more metallic induction heating elements when the aerosol generating article 10 is positioned in the receptacle 220 of the aerosol generating device 200. Once the aerosol generating article 10 is freely received into the aerosol generating device 200 and onto the heating blade element 230, the aerosol generating device 200 is activated to heat the aerosol generating substrate 12 to a temperature of approximately 375 degrees Celsius. When a user inhales into the mouth end 11 of the aerosol generating article 10, the volatile compounds released from the aerosol generating substrate 12 are drawn down through the aerosol generating article 10 and condense to form an aerosol that is drawn through the nozzle 11 of the aerosol generating article 10 into the user's mouth. The illustrative examples described above are not exhaustive. Other examples consistent with those described above will be evident to those skilled in the art.

Claims

1. An aerosol-generating substrate element comprising: a cylindrical aerosol-generating substrate comprising approximately 10% to approximately 30% glycerin by weight; a first paper wrapper comprising opposite edges adjoining each other to circumscribe the aerosol-forming substrate and form a first bonding line; a second paper wrapper comprising opposite edges adjoining each other to circumscribe the first paper wrapper and form a second bonding line; and the first bonding line is offset from the second bonding line and the first paper wrapper and the second paper wrapper do not extend beyond the aerosol-generating substrate and the first paper wrapper and the second paper wrapper have a combined thickness in the range of approximately 60 micrometers to approximately 200 micrometers.

2. The aerosol generating substrate element according to claim 1, wherein the first bond line is offset from the second bond line by at least approximately 5%, or at least approximately 10%, or at least approximately 15% of a circumference of the aerosol generating substrate.

3. The aerosol generating substrate element according to any preceding claim, wherein the aerosol generating substrate is circumscribed by fewer than three layers of paper at any point around a circumference of the aerosol generating substrate that do not extend beyond the aerosol generating substrate.

4. The aerosol generating substrate element according to any preceding claim, wherein the first paper wrapper and the second paper wrapper have a combined thickness in the range of approximately 78 micrometers to approximately 160 micrometers, or 78 micrometers to approximately 140 micrometers, or approximately 100 micrometers to approximately 140 micrometers, or approximately 125 micrometers to approximately 140 micrometers.

5. The aerosol-generating substrate element according to any preceding claim, wherein the first paper wrapper and the second paper wrapper have a uniform combined thickness that does not differ at any point around a circumference of the aerosol-generating substrate element by more than approximately 30 micrometers, or more than approximately 20 micrometers, or more than approximately 10 micrometers, or more than approximately 5 micrometers.

6. The aerosol generating substrate element according to any of the preceding claims, wherein the aerosol generating substrate has a diameter in the range of approximately 6.8 mm to approximately 7.1 mm.

7. The aerosol generating substrate element according to any preceding claim, wherein the at least first paper wrapper and the second paper wrapper have a combined paper thickness to tobacco substrate diameter ratio in the range of approximately 1:120 to approximately 1:40, or approximately 1:100 to approximately 1:

50.

8. The aerosol generating substrate element according to any of the preceding claims, wherein the aerosol generating substrate comprises homogenized tobacco material.

9. The aerosol-generating substrate element according to claim 8, wherein the homogenized tobacco material comprises tobacco material, from approximately 1 percent to approximately 5 percent of a binder, and from approximately 10 percent to approximately 30 percent of glycerin, on a dry weight basis. LCfrQnn / zznz / E / YiAi 10. The aerosol generating substrate according to any of the preceding claims, wherein the aerosol generating substrate comprises a metallic induction heating element.

11. The aerosol generating substrate according to any of the preceding claims, wherein the aerosol generating substrate comprises a plurality of metallic induction heating elements.

12. An aerosol generating system, comprising: an aerosol generating article comprising the aerosol generating substrate element according to any preceding claim attached to a filter element; and an aerosol generating device comprising a heating element configured to heat the aerosol generating substrate element.

13. The aerosol generating system according to claim 12, wherein the heating element is a resistive heating blade element configured to be inserted into the aerosol generating substrate element.

14. The aerosol generating system according to claim 12, wherein the heating element is in the inductive heating element configured to inductively heat the metal induction heating elements incorporated within the aerosol generating substrate element.