Tobacco – Tobacco or tobacco substitute product or component part thereof – Cigar or cigarette
Patent
1993-10-12
1996-01-02
Bahr, Jennifer
Tobacco
Tobacco or tobacco substitute product or component part thereof
Cigar or cigarette
131353, 131370, A24D 102
Patent
active
054799490
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a sheet material into which at least one aromatic substance has been incorporated, designed for the manufacture of smoking products, such as cigarettes, cigars, or similar products, as well as smoking products that include such a material.
The invention aims at preventing loss or premature modification of at least one aromatic substance before the product is smoked, without modifying the smoke unfavorably and without the substance being detectable before the product is smoked.
It also aims at releasing at least one aromatic substance into the primary and/or secondary flux throughout the smoking of the product, at a sufficiently low temperature to avoid thermal degradation of the said substance.
The sheet material according to the invention can be used as a wrapper for the product to be smoked.
It can also be used as reconstituted tobacco leaf, manufactured by a well-known paper-making technique.
It has already been proposed to incorporate aromatic or non-aromatic substances in the paste itself used in the manufacture of the paper.
Thus in the U.S. Pat. No. 2,886,042 (REYNOLDS) it was proposed to dissolve sodium and potassium salts in the initial paper pulp, but essentially for the purpose of improving the combustion properties of this paper and its quality.
In the patent EP 0251132 (SHIBANAI), it is proposed to include substances, notably perfumes, in cyclodextrin in order to form molecular-inclusion compounds and to mix them into the pulp and water used in paper manufacture, and particularly in wrapping paper.
In this patent, this molecular inclusion should not be total, because if it were, the paper would not release any odor of its own, which is the purpose sought by this patent.
We are speaking here of a prolonged aromatic effect, and it is due to the fact that molecules are partially adsorbed onto the cyclodextrins or in an emulsion in the mixture and that they evaporate progressively from it when it is applied to the paste during the course of manufacture. It has never been suggested that the cyclodextrins or the inclusion complexes be submitted to a thermal effect that degrades them in order to release the aromas.
In all previous documents, no measure is envisioned such that the aromatic substances incorporated in the paper intended to serve as a wrapper for a smoking product would be protected until the product is consumed and would be released at a sufficiently low temperature, that is, before being submitted to the high temperatures of the flame when the product is smoked, both in free combustion and in forced combustion.
The invention aims precisely at obtaining the above results, and it proposes for this a process for preparation of a sheet material intended for the manufacture of smoking products, such as cigars, cigarettes, or analogous products, in which one introduces into the paste itself used in the manufacture of the material, aromatic substances or preparations that are designed not to be released until the moment of combustion of the product to be smoked and that are included by molecular encapsulation or complexing in cyclodextrins, characterized by the fact that measures are taken so that the said aromatic substances are all included in the cyclodextrins.
This complete inclusion of the said substances can be realized, after the inclusion operation, by getting rid, by heating or washing for example, of the inclusion products of the said aromatic substances that were not included, in particular those that were simply adsorbed onto the surfaces of the cyclodextrins.
This removal of the substances that were not included can also be performed be drying the coating material in the paper machine itself.
Because of the fact of total inclusion, the said aromatic substances do not migrate in the tobacco and are preserved until the moment when, through the thermal degradation caused by the advance of the flame of the lit product, the cyclodextrins again release abruptly a part of the said aromatic substances they are protecting, this violent re-release continuing progres
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patent: 5137034 (1992-08-01), Perfetti et al.
patent: 5144964 (1992-09-01), Demain
Battard Jean C.
Esnault Daniel
Mane Jean M. E.
Bahr Jennifer
Societe Nationale d'Exploitation Industrielle des Tabacs et Allu
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