WO2022107055A1 - A method of preparing a reconstituted tobacco sheet for heat-no-burn devices - Google Patents

A method of preparing a reconstituted tobacco sheet for heat-no-burn devices Download PDF

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Publication number
WO2022107055A1
WO2022107055A1 PCT/IB2021/060733 IB2021060733W WO2022107055A1 WO 2022107055 A1 WO2022107055 A1 WO 2022107055A1 IB 2021060733 W IB2021060733 W IB 2021060733W WO 2022107055 A1 WO2022107055 A1 WO 2022107055A1
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WO
WIPO (PCT)
Prior art keywords
tobacco
dry
sheet
powder
pulp
Prior art date
Application number
PCT/IB2021/060733
Other languages
French (fr)
Inventor
Mansueto Favaro
Original Assignee
Hf S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hf S.R.L. filed Critical Hf S.R.L.
Publication of WO2022107055A1 publication Critical patent/WO2022107055A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/14—Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products

Definitions

  • the present invention relates to the sector of heat-not-burn (HNB) tobacco products.
  • the invention has been developed with particular reference to a method of preparing a reconstituted tobacco sheet for heat-not-burn tobacco devices.
  • HNB products The underlying idea of HNB products is the possibility of administering nicotine to the smoker via the "smoke" of a cigarette by simply heating the tobacco, instead of burning it, since nicotine evaporates at about 270 °C. As a result, it is possible to avoid the simultaneous inhalation of the pyrolysis products which are extremely cancerogenic and which develop at temperatures above 400 °C.
  • the first method involves the use of a metal element, for example a thin metal plate, on top of which or around which the tobacco-based product is inserted.
  • the metal plate which is connected to an electric power supply, heats up and consequently heats the product.
  • the second method involves the use of an alternating electromagnetic field which generates a plurality of parasitic currents able to produce heat in a metal element which they cross.
  • WO95/27411 in the name of Philip Morris Products Inc. describes a cigarette comprising a cylindrical layer of tobacco and a cylindrical layer of metallic material.
  • a metal component is mixed with a binder so as to form an ink.
  • the ink is then applied onto a reconstituted tobacco sheet made using one of the known methods.
  • CN1 10013047 in the name of China Tobacco Yunnan describes a method of preparing a reconstituted tobacco sheet for heat-not-burn tobacco devices.
  • the method involves the step of mixing tobacco powders with water in order to create an aqueous sludge, to which a metal component, and in particular particles of aluminium, gold, iron, nickel, cobalt, carbon steel, stainless steel or copper, is added.
  • the general object of the present invention is that of providing a method which further improves the sensorial experience of the consumer, which increases the distribution of the temperature inside the heated tobacco product and which makes the use of an HNB device as similar as possible to the use of a normal cigarette.
  • the method further comprises the step of:
  • the method of preparing a reconstituted tobacco sheet for heat-not-burn tobacco devices comprises a first step of providing a predetermined quantity of tobacco-based material.
  • tobacco-based material is understood as meaning a material comprising the stem and/or the stalk and/or the tobacco leaf, tobacco extract, or other source of nicotine.
  • the tobacco-based material is dry, namely devoid of water and/or having an extremely small percentage moisture content.
  • stem is used to refer to the main structural part of the tobacco plant which remains after the leaves, including the stalk and the leaf blade, have been removed.
  • the stem supports the tobacco leaves and connects them to the roots of the plant and has a high cellulose content.
  • stalk is used here to refer to the structural portion of the tobacco plant which connects the leaf blade to the stem, as well as the veins or ribs which extend across the leaves between the parts of the leaf blade.
  • the method according to the present invention then comprises a second step of processing the tobacco-based material to obtain a tobacco powder, preferably a dry tobacco powder.
  • the powder may be obtained by means of methods and machinery of the known type, such as grinding or shredding machines which are able to reduce the tobacco-based material into extremely small granules.
  • the method according to the present invention then comprises a third step of providing a dry tobacco powder and combining the dry tobacco powder with a metal component to obtain a dry mixture of tobacco powder and metal component.
  • Metal component is understood as meaning any chemical element with a high electrical and thermal conductivity such as, for example, one or more of the following elements: aluminium, gold, iron, nickel, cobalt, carbon steel, stainless steel or copper.
  • the metal component is preferably in the form of particles or granules such as to form a powder, and even more preferably the particles or granules have a diameter of between 0.09 mm and 0.44 mm. According to a further embodiment, the particle size of the particles or granules is similar to the particle size of the tobacco powder.
  • dry referring to the mixture of tobacco powder and metal component is understood as meaning a mixture with a low percentage moisture content based on the wet weight, preferably less than 20%, even more preferably less than 16%.
  • the dry tobacco powder and the metal component in powder form may be mixed together in a very uniform and homogeneous manner, avoiding compaction of the metal component particles and/or clumping together of the tobacco powder into one or more portions.
  • the uniform and homogeneous mixing of the dry tobacco powder and the metal component in powder form are able to ensure the formation of a reconstituted tobacco sheet for heat-not-burn tobacco devices in which the metal component is distributed uniformly and homogeneously over the whole sheet.
  • this feature allows the parasitic currents generated by the electromagnetic field produced by the HNB device to cross a greater quantity of the tobacco-based product and therefore maximize the evaporation of the nicotine contained therein and increase the quantity of vapour inhaled by the consumer. Moreover, the greater uniformity of distribution of the metal particles over the whole sheet results in a greater uniformity of distribution of the heating effect of the reconstituted tobacco.
  • the quantities of tobacco powder and metal component inside the dry mixture may obviously vary depending on the final result which is to be obtained in the reconstituted tobacco sheet. According to one of the preferred embodiments of the present invention, the percentage by weight of metal particle concentration in the dry mixture is between 1% and 20%.
  • the method according to the present invention comprises a fourth step of combining the dry mixture of tobacco powder and metal component with a binder so as to form a tobacco pulp.
  • binder is understood as meaning any substance able to adhere to the particles of the mixture of tobacco powder and metal component in powder form so as to form a single resistant complex, namely a tobacco pulp and metal component.
  • the binder may be, for example, but not solely guar, CMC and/or colloid or other components with a binder function.
  • the dry mixture of tobacco powder and metal component may be first combined with water and then with one of the substances indicated above.
  • pulp is understood as meaning a semi-solid substance in which, for example, but not exclusively, the maximum moisture is less than 50% based on the wet weight, and preferably between 10% and 30% based on the wet weight.
  • the method according to the present invention comprises a fifth step of processing the tobacco pulp to obtain a sheet of tobacco.
  • the pulp may be processed by means of a method and a machine of the known type which is able to provide a quantity of low thickness homogeneous material spread uniformly over a surface, for example by means of a rolling process.
  • the method according to the present invention comprises a sixth step of drying the sheet of tobacco to create a reconstituted tobacco sheet.
  • the tobacco sheet may be dried, cured and de-moisturized using any one of the known processes.
  • the dried tobacco sheet may have a percentage moisture content based on the wet weight preferably of between 4% and 16%.
  • first two steps of the method according to the present invention may be carried out at times and in places different from those of the following steps. It will also be clear to the person skilled in the art that the first two steps are not essential for resolution of the technical problem and the results obtained by the present invention and that an embodiment of the present invention may not comprise the first two steps.
  • one or more additives for example glycerine, propylene glycol, and/or a mixture of water and these substances, may be added to the dry mixture of tobacco powder and/or to the tobacco pulp.
  • Thee substances act as "nicotine conveyors", in the sense that they evaporate within the temperature range where the tobacco may be heated without being burnt, then condensing into a nicotine-containing aerosol during transfer from the heated zone to the consumer's mouth.
  • one or more further additives for example wood pulp and/or hemp pulp fibres, and/or a substance comprising cellulose, may be added to the dry mixture of tobacco powder and/or to the tobacco pulp. These substances allow the formation of a web in the tobacco sheet which reinforces the mechanical features thereof.

Abstract

A method of preparing a reconstituted tobacco sheet comprises the steps of providing a dry tobacco powder, combining the dry tobacco powder with a binder so as to form a tobacco pulp, processing the tobacco pump to create a continuous sheet of tobacco, and drying the sheet of tobacco to obtain a reconstituted tobacco sheet. The method also comprises the step of mixing metal particles with the dry tobacco powder to obtain a dry mixture of tobacco powder and metal component.

Description

Title
"A method of preparing a reconstituted tobacco sheet for heat-no-burn devices"
Description
The present invention relates to the sector of heat-not-burn (HNB) tobacco products. The invention has been developed with particular reference to a method of preparing a reconstituted tobacco sheet for heat-not-burn tobacco devices.
The underlying idea of HNB products is the possibility of administering nicotine to the smoker via the "smoke" of a cigarette by simply heating the tobacco, instead of burning it, since nicotine evaporates at about 270 °C. As a result, it is possible to avoid the simultaneous inhalation of the pyrolysis products which are extremely cancerogenic and which develop at temperatures above 400 °C.
At the same time, particular attention has been paid to the sensations perceived by the consumer when using an HNB device. The temperature which the HNB devices are able to reach, and therefore the temperature to which the tobacco-based product is heated, results in different sensorial experiences for the consumer.
Two methods for heating the tobacco-based product are known: resistive heating and electromagnetic induction heating. The first method involves the use of a metal element, for example a thin metal plate, on top of which or around which the tobacco-based product is inserted. The metal plate, which is connected to an electric power supply, heats up and consequently heats the product. The second method involves the use of an alternating electromagnetic field which generates a plurality of parasitic currents able to produce heat in a metal element which they cross.
In connection with this second method solutions which allow the metal element to be distributed over the tobacco-based product in a uniform and extensive manner have been proposed.
For example, WO95/27411 in the name of Philip Morris Products Inc. describes a cigarette comprising a cylindrical layer of tobacco and a cylindrical layer of metallic material. In this case, a metal component is mixed with a binder so as to form an ink. The ink is then applied onto a reconstituted tobacco sheet made using one of the known methods.
CN1 10013047 in the name of China Tobacco Yunnan describes a method of preparing a reconstituted tobacco sheet for heat-not-burn tobacco devices. The method involves the step of mixing tobacco powders with water in order to create an aqueous sludge, to which a metal component, and in particular particles of aluminium, gold, iron, nickel, cobalt, carbon steel, stainless steel or copper, is added.
It has been noted that with the method described in CN110013047 the metal particles tend to precipitate onto the bottom of the aqueous sludge, owing to their greater specific weight. This happens both during the mixing step and the transportation step as well as during preparation of the compound for creation of the composite tobacco sheet. Consequently, the density and distribution of the metal particles inside the composite tobacco sheet is variable, non-uniform and inconsistent. During use, the portions of the tobacco-based product which contain a greater density of particles reach higher temperatures than other portions containing fewer metal particles. Heating of the tobacco-based product therefore is not uniform and the sensation perceived by the consumer worsens.
The general object of the present invention is that of providing a method which further improves the sensorial experience of the consumer, which increases the distribution of the temperature inside the heated tobacco product and which makes the use of an HNB device as similar as possible to the use of a normal cigarette.
In view of this object the idea which has occurred to the Applicant is that of providing, according to the invention, a method of preparing a reconstituted tobacco sheet which comprises the following steps;
- providing a dry tobacco powder;
- combining the dry tobacco powder with a binder to form a tobacco pulp;
- processing the tobacco pulp to create a continuous sheet of tobacco; and
- drying the sheet of tobacco to obtain a reconstituted tobacco sheet; characterized in that the method further comprises the step of:
- mixing metal particles with the dry tobacco powder.
Further technical features and advantages of the present invention will become clearer from the description given below.
It is to be understood that elements or technical features of one embodiment may be conveniently incorporated in other embodiments without further clarifications.
Reference will now be made in detail to the various embodiments of the invention. Each example is provided merely by way of illustration of the invention and is understood as not being a limitation thereof. For example, the technical features shown or described since they form part of an embodiment may be adopted in, or associated with, other embodiments in order to produce a further embodiment. It is understood that the present invention will be inclusive of these modifications and variants.
In a first embodiment of the present invention, the method of preparing a reconstituted tobacco sheet for heat-not-burn tobacco devices comprises a first step of providing a predetermined quantity of tobacco-based material. "Tobacco-based material" is understood as meaning a material comprising the stem and/or the stalk and/or the tobacco leaf, tobacco extract, or other source of nicotine. Preferably, the tobacco-based material is dry, namely devoid of water and/or having an extremely small percentage moisture content.
In the present description the term "stem" is used to refer to the main structural part of the tobacco plant which remains after the leaves, including the stalk and the leaf blade, have been removed. The stem supports the tobacco leaves and connects them to the roots of the plant and has a high cellulose content. The term "stalk" is used here to refer to the structural portion of the tobacco plant which connects the leaf blade to the stem, as well as the veins or ribs which extend across the leaves between the parts of the leaf blade.
The method according to the present invention then comprises a second step of processing the tobacco-based material to obtain a tobacco powder, preferably a dry tobacco powder. The powder may be obtained by means of methods and machinery of the known type, such as grinding or shredding machines which are able to reduce the tobacco-based material into extremely small granules. The method according to the present invention then comprises a third step of providing a dry tobacco powder and combining the dry tobacco powder with a metal component to obtain a dry mixture of tobacco powder and metal component. "Metal component" is understood as meaning any chemical element with a high electrical and thermal conductivity such as, for example, one or more of the following elements: aluminium, gold, iron, nickel, cobalt, carbon steel, stainless steel or copper.
The metal component is preferably in the form of particles or granules such as to form a powder, and even more preferably the particles or granules have a diameter of between 0.09 mm and 0.44 mm. According to a further embodiment, the particle size of the particles or granules is similar to the particle size of the tobacco powder.
The term "dry" referring to the mixture of tobacco powder and metal component is understood as meaning a mixture with a low percentage moisture content based on the wet weight, preferably less than 20%, even more preferably less than 16%.
Owing to this particularly advantageous feature, the dry tobacco powder and the metal component in powder form may be mixed together in a very uniform and homogeneous manner, avoiding compaction of the metal component particles and/or clumping together of the tobacco powder into one or more portions. As will appear more clearly below, the uniform and homogeneous mixing of the dry tobacco powder and the metal component in powder form are able to ensure the formation of a reconstituted tobacco sheet for heat-not-burn tobacco devices in which the metal component is distributed uniformly and homogeneously over the whole sheet. During use, this feature allows the parasitic currents generated by the electromagnetic field produced by the HNB device to cross a greater quantity of the tobacco-based product and therefore maximize the evaporation of the nicotine contained therein and increase the quantity of vapour inhaled by the consumer. Moreover, the greater uniformity of distribution of the metal particles over the whole sheet results in a greater uniformity of distribution of the heating effect of the reconstituted tobacco.
The quantities of tobacco powder and metal component inside the dry mixture may obviously vary depending on the final result which is to be obtained in the reconstituted tobacco sheet. According to one of the preferred embodiments of the present invention, the percentage by weight of metal particle concentration in the dry mixture is between 1% and 20%.
The method according to the present invention comprises a fourth step of combining the dry mixture of tobacco powder and metal component with a binder so as to form a tobacco pulp. The term "binder" is understood as meaning any substance able to adhere to the particles of the mixture of tobacco powder and metal component in powder form so as to form a single resistant complex, namely a tobacco pulp and metal component. The binder may be, for example, but not solely guar, CMC and/or colloid or other components with a binder function. Alternatively, the dry mixture of tobacco powder and metal component may be first combined with water and then with one of the substances indicated above.
The term "pulp" is understood as meaning a semi-solid substance in which, for example, but not exclusively, the maximum moisture is less than 50% based on the wet weight, and preferably between 10% and 30% based on the wet weight.
The method according to the present invention comprises a fifth step of processing the tobacco pulp to obtain a sheet of tobacco. The pulp may be processed by means of a method and a machine of the known type which is able to provide a quantity of low thickness homogeneous material spread uniformly over a surface, for example by means of a rolling process.
The method according to the present invention comprises a sixth step of drying the sheet of tobacco to create a reconstituted tobacco sheet.
The tobacco sheet may be dried, cured and de-moisturized using any one of the known processes. The dried tobacco sheet may have a percentage moisture content based on the wet weight preferably of between 4% and 16%.
From the description provided above it is clear that the first two steps of the method according to the present invention may be carried out at times and in places different from those of the following steps. It will also be clear to the person skilled in the art that the first two steps are not essential for resolution of the technical problem and the results obtained by the present invention and that an embodiment of the present invention may not comprise the first two steps.
According to an alternative embodiment of the present invention, one or more additives, for example glycerine, propylene glycol, and/or a mixture of water and these substances, may be added to the dry mixture of tobacco powder and/or to the tobacco pulp. Thee substances act as "nicotine conveyors", in the sense that they evaporate within the temperature range where the tobacco may be heated without being burnt, then condensing into a nicotine-containing aerosol during transfer from the heated zone to the consumer's mouth.
According to a further embodiment of the present invention, one or more further additives, for example wood pulp and/or hemp pulp fibres, and/or a substance comprising cellulose, may be added to the dry mixture of tobacco powder and/or to the tobacco pulp. These substances allow the formation of a web in the tobacco sheet which reinforces the mechanical features thereof.
All the details may be replaced by other technically equivalent elements. Similarly, the materials used, and the associated forms and dimensions may be of any kind depending on the needs, without thereby departing from the scope of protection of the following claims.

Claims

1. A method of preparing a reconstituted tobacco sheet which comprises the following steps:
- providing a dry tobacco powder,
- combining the dry tobacco powder with a binder to form a tobacco pulp,
- processing the tobacco pulp to create a continuous sheet of tobacco, and
- drying the sheet of tobacco to obtain a reconstituted tobacco sheet, characterized in that the method also comprises the step of:
- mixing metal particles with the dry tobacco powder to obtain a dry mixture of tobacco powder and metal component.
2. A preparation method according to claim 1 , characterized in that it further comprises a step of combining the dry tobacco powder and/or the tobacco pulp with additives.
3. A preparation method according to claim 2, characterized in that the additives comprise one or more of the following elements: propylene glycol, glycerine, wood pulp and/or hemp pulp fibres, and/or a substance comprising cellulose.
4. A preparation method according to claim 1 , characterized in that said dry mixture of tobacco powder and metal component has a percentage moisture content of less than 20%.
5. A preparation method according to claim 1 , characterized in that said tobacco pulp has a moisture content of between 10% and 30% based on the wet weight.
6. A preparation method according to claim 1 , characterized in that the percentage by weight of concentration of metal particles in the dry mixture
9 of tobacco powder and metal component is between 1% and 20%.
7. Dry mixture of tobacco powder and metal component, particularly suitable for use in a method of preparing a reconstituted tobacco sheet according to claims 1 to 6, characterized in that it has a percentage by weight of metal particle concentration of between 1 % and 20%.
8. Dry mixture according to claim 7, characterized in that it has a percentage moisture content of less than 20%.
PCT/IB2021/060733 2020-11-23 2021-11-19 A method of preparing a reconstituted tobacco sheet for heat-no-burn devices WO2022107055A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000028031A IT202000028031A1 (en) 2020-11-23 2020-11-23 METHOD OF PREPARING A RECONSTITUTED TOBACCO SHEET FOR HEATED UNBURNED TOBACCO DEVICES
IT102020000028031 2020-11-23

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WO2022107055A1 true WO2022107055A1 (en) 2022-05-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115088859A (en) * 2022-06-13 2022-09-23 湖北中烟工业有限责任公司 Preparation method and application of reconstituted tobacco

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN107319628B (en) * 2017-05-27 2018-12-11 浙江中烟工业有限责任公司 One kind is suitable for heating incombustible tobacco matrixes and preparation method thereof
US20190075851A1 (en) * 2014-05-21 2019-03-14 Philip Morris Products S.A. Inductively heatable tobacco product
CN110013047A (en) * 2019-04-30 2019-07-16 云南中烟工业有限责任公司 A kind of reconstituted tobacco comprising metallic particles and preparation method thereof and cigarette comprising it
US20190387787A1 (en) * 2018-06-22 2019-12-26 Rai Strategic Holdings, Inc. Aerosol source member having combined susceptor and aerosol precursor material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5613505A (en) 1992-09-11 1997-03-25 Philip Morris Incorporated Inductive heating systems for smoking articles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190075851A1 (en) * 2014-05-21 2019-03-14 Philip Morris Products S.A. Inductively heatable tobacco product
CN107319628B (en) * 2017-05-27 2018-12-11 浙江中烟工业有限责任公司 One kind is suitable for heating incombustible tobacco matrixes and preparation method thereof
US20190387787A1 (en) * 2018-06-22 2019-12-26 Rai Strategic Holdings, Inc. Aerosol source member having combined susceptor and aerosol precursor material
CN110013047A (en) * 2019-04-30 2019-07-16 云南中烟工业有限责任公司 A kind of reconstituted tobacco comprising metallic particles and preparation method thereof and cigarette comprising it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115088859A (en) * 2022-06-13 2022-09-23 湖北中烟工业有限责任公司 Preparation method and application of reconstituted tobacco

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