FI59705C - POROES TOBAKSERSAETTNING - Google Patents

Description

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England-England (GB) 11029/7 ^ (71) British-American Tobacco Company Limited, Westminster House, 7,

Millbank, London, S.W.I., England-England (GB) (72) Roger William Hedge, Lymington, Hampshire, England-England (GB) (7M Leitzinger Oy (5Π) Porous tobacco substitute - Porös tobaksersättning

The present invention relates to a porous tobacco substitute containing a substantially combustible substituted cellulose derivative and a water-insoluble inorganic diluent, the density of which has been reduced by making it porous. The invention also relates to a method for producing such a porous tobacco substitute.

British Patent Publication No. 1,305,492 discloses a tobacco substitute of this type having a reduced density. The publication discloses a large number of different combustible carbohydrate materials for use in tobacco substitutes. By way of example, carboxymethylcellulose has been selected to obtain the most satisfactory results. A degree of substitution of 0.2 to 3.0, preferably 0.4 to 1.2 ether groups per glucose unit has been proposed. In order to create the pores, the publication has exclusively proposed the use of a swelling agent such as ammonium carbonate. However, the use of such blowing agents has detrimental effects e.g. the taste of the tobacco, and their use must be closely monitored during the manufacturing process.

It is an object of the invention to provide a porous tobacco substitute and a method of making the same, in which porosity can be achieved by means of air bubbles without the use of any other foaming agents, blowing agents or the like, and without the need to closely monitor the conditions associated with foaming or blowing with such agents. .

To achieve this purpose, the porous tobacco substitute according to the invention is characterized in that it contains a binder consisting of partially or completely water-soluble heat-gelling methoxyl-substituted cellulose having a degree of methoxyl substitution of at least 1.5 methoxyl groups per anhydroglucose unit. - 13% by weight and 75% to 85% by weight of the diluent of the amount of tobacco substitute, and that the tobacco substitute is made porous by introducing and dispersing air therein, the air bubbles forming closed cells distributed throughout the tobacco substitute. The former combination of substances is a prerequisite for the mixture to be made porous in the latter way. Successful removal and dispersion of air bubbles is not possible unless the binder is composed primarily of thermally gelling substituted cellulose or unless the degree of methoxyl substitution is at least 1.5.

The process according to the invention for preparing such a tobacco substitute by mixing a substituted cellulose derivative and a water-insoluble inorganic diluent and reducing the density of the mixture by making it porous is characterized in that a binder consisting of at least 1.5 methoxyl group per anhydroglucose unit, mixed with a water-insoluble inorganic diluent, and the density of the mixture is reduced by introducing and dispersing air in it by subjecting the mixture to high-shear mixing. High shear mixing is the most practical and simplest way to introduce air into the tobacco substitute mixture and disperse it uniformly throughout.

Thermally gelling substituted cellulose means cellulose which forms a thermally gelling solution in water, 59705 3 i.e. a solution whose viscosity increases rapidly as the temperature increases over a certain temperature range depending on the substance. The thermally gelling substituted cellulose used may be methylcellulose and / or further substituted methylcellulose having at least said degree of substitution. Such methylcellulose can be used in admixture with either low methoxy methylcellulose or non-thermally gelling substituted cellulose such as sodium carboxymethylcellulose. It is essential for carrying out the object of the invention that said binder is said amount of thermally gelling methylcellulose or further substituted methylcellulose having at least the above-mentioned methoxy content. By further substituted methylcellulose is meant methylcellulose containing some amount of carboxymethyl or other similar substituents. A sufficiently high methoxy content for the purposes of the invention is generally a degree of substitution called "high" by the manufacturers of such products, this degree of substitution usually being between 1.5 and 2.4 methoxy units per anhydroglucose unit. Due to the variability in the quality of these products, the exact degree of substitution cannot always be indicated, but only the range in which suitable properties can be obtained »

Suitably, a planetary mixer is used to disperse and dissolve the ingredients in the water prior to placing the material in a space that can be used in the smoking mixture. This type of mixer throws air into the slurry itself. However, in this way it is not possible to obtain a sufficiently uniform product containing large amounts of air bubbles, preferably small closed bubbles. It is necessary to use a high-shear mixer which can supply a controlled amount of air, more than can be supplied to the air by the action of a planetary mixer, 4,5705 and which can circulate temperature-controlled imaged water through the mixer head jacket. The mixture is preferably raised to a temperature between 35 and 60 ° C. The power of a high-shear mixer is basically due to the fact that it reduces the size of air bubbles. The largest bubble size should be less than the thickness of the sheet material to be made, and preferably less than half of this thickness, so that the bubbles do not substantially break the surface of the sheet. With the above-mentioned method, it is possible to reliably produce a uniform foam material with closed cells, without using any other flotation, expansion! without the need to closely monitor the conditions associated with foaming or swelling with such substances.

The inert inorganic diluent or filler is preferably calcium carbonate (lime or Spanish white) but other substances such as calcium sulphate (gypsum, calcium phosphate, aluminum trihydrate, aluminates or the like) may also be used, provided that they are insoluble in water.

The mixture may also contain caramel or tobacco extract. Caramel can replace all or part of the tobacco extract known to be used as an ingredient in tobacco substitutes. The mixture may further contain a wetting agent such as glycerol. The mixture need not contain any other ingredients.

Suitable amounts of ingredients by weight are, for example:

Binder, 7 to 13%, of which 10 to 100% of this amount should be substituted cellulose having the above-mentioned high methoxy content.

Caramel and / or tobacco extract, 2 to 20%, but preferably 8 to 16%. Inert inorganic diluent, 75-85%.

Wetting agent, 1 to 10%, but preferably 2 to 6%.

If such a mixture is used as a torn mixture with cut tobacco and / or reconstituted tobacco, the amount of mixture in the total mixture should be between 1 and 99% by weight, preferably usually between 5 and 75%.

5 59705

The following examples illustrate how the invention may be practiced.

Example 1 0.5 parts of glycerol (B.P. grade) was added to 51 parts of water in a dish of a Hobart planetary mixer with a port-type beater blade. Then 1.6 parts of commercial sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd., estimated viscosity at 2300 cps in 2% aqueous solution at 20 ° C by the Brookfield method; average degree of methoxyl substitution 1.67 and little undetermined substitution of sodium carboxymethyl groups) was then added. . The mixture was stirred for 1 hour, after which 15.2 parts of commercial Spanish white (very pure, 90% less than BS 200 mesh) was added. The slurry was further stirred for 2 hours in the same mixer and the resulting slurry was then fed through an Oakes high shear continuous automatic mixer with adjustable air supply and circulating temperature controlled hot water through the mixer head jacket. The rotor speed and recirculated water temperature of the Oakes mixer were adjusted so that the aerated slurry entered the gate coater at 42-48 ° C and cast as a sheet on an endless strip of stainless steel passed through a set of drying chambers 80 ° C commonly used in the manufacture of tobacco sheet products. and steam heating under the strip was used. The minimum rotor speed of the Oakes mixer to obtain suitably small air bubbles was 250 rpm. At the maximum air supply speed to the Oakes mixer that could form a cohesive product in this example, the specific weight of the sheet produced was 0.25. Gradually reducing the air supply flow rate caused the specific gravity to increase to 0.75. Above and below, the unit of specific gravity is kg / dm.

Example 2

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 2.75 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.). After stirring for one hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish white were added simultaneously. According to Example 1, cast plates with specific gravities ranging from 0.3 to 0.8 were obtained.

6 59705

Example 3

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water and then 0.75 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 2 parts of methylcellulose (grade M2500, British Celanese Ltd., viscosity) were added. 2200 to 2800 cps in 2% aqueous solution at 20 ° C by the Ostwald method; methoxyl substitution was reported to be average, averaging between 1.5 and 1.9 methoxyl groups per anhydroglucose unit). After stirring for one hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 4

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 0.75 parts of methylcellulose (grade C2026, Henkel Chemicals Ltd., viscosity 2000 -3000 cPs in 2% aqueous solution at 20 ° C) and reported the degree of methoxyl substitution high, average 1.8 methoxyl groups per anhydroglucose unit), and 2 parts methylcellulose (grade M2500, British Celanese Ltd.). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 5

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 0.75 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 2 parts of sodium carboxymethylcellulose (grade F100, British Celanese Ltd., viscosity 80 - 120 cps in 1% aqueous solution at 25 ° C by the Ostwald method, degree of substitution 0.5 to 0.7 carboxymethyl groups per anhydroglucose unit). Stir for one hour and add 2.5 parts caramel (65% dry matter) and 19.25 parts Spanish white. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 6 7 59705

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water containing 1.25 parts (dry weight) of aqueous tobacco extracts. Subsequently, 0.75 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 2 parts of sodium carboxymethylcellulose (grade FlOO, British Celanese Ltd.) were added. Stir for one hour and add 1.25 parts caramel (65% dry matter) and 19.25 parts Spanish white. According to Example 1, sheets with specific gravities ranging from 0.5 to 0.9 were prepared.

Example 7

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 0.75 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 2 parts of sodium carboxymethylcellulose (grade F8, British Celanese Ltd., viscosity 5). -9 cPs in 1% aqueous solution at 25 ° C by the Ostwald method, degree of substitution 0.5 to 0.7 carboxymethyl groups per anhydroglucose unit). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.3 to 0.8 were prepared.

Example 8

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 2 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 0.75 part of sodium carboxymethylcellulose (grade F100, British Celanese Ltd.). Stir for 1 hour and add 2.5 parts caramel (65% dry matter) and 19.25 parts Spanish white. According to Example 1, sheets with specific gravities ranging from 0.25 to 0.7 were prepared.

Example 9

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 2 parts of sodium carboxymethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 0.75 part of methylcellulose (grade M2500, British Celanese Ltd.). . After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.3 to 0.7 were prepared.

Example 10

The procedure of Example 1 was followed, but 0.5 parts of glycerol was added to 60 parts of water, followed by 0.275 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 2.475 parts of methylcellulose (grade M2500, British Celanese Ltd.). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 11

The procedure of Example 1 was followed, but 0.5 parts of glycerol was added to 60 parts of water, followed by 0.35 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 1.40 parts of methylcellulose (grade M2500, British Celanese Ltd.). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 12

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 0.275 parts of sodium carboxymethylmethylcellulose (grade C7501, Henkel Chemicals Ltd.) and 2.475 parts of sodium carboxymethylcellulose (grade F100, British Celanese Ltd.). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

9 59705

Example 13

The procedure of Example 1 was followed, but the Spanish white was replaced with the same amount of aluminum trihydrate of similar particle size. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 14

The procedure of Example 3 was followed, but the Spanish white was replaced with the same amount of aluminum trihydrate of similar particle size. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 15

The procedure of Example 1 was followed, but 1 part glycerol was added to 60 parts water, followed by 0.6 parts methylcellulose (grade C2026, Henkel Chemicals Ltd.) and 2.4 parts sodium carboxymethylcellulose (grade F100, British Celanese Ltd. ). Stir for 1 hour and add 2 parts caramel (65% dry matter) and 19 parts Spanish white. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 16

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 2.75 parts of methylcellulose (MMPR2 grade, British Celanese Ltd., viscosity 450-550 cPs at 1.5% 80:20 v). / v Methylene chloride: in methanol solution at 20 ° C (degree of methoxyl substitution was reported to be high, averaging between 1.5 and 1.9 methoxyl groups per anhydroglycose unit). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 17 ίο 5 970 5

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 60 parts of water, followed by 2.75 parts of methylcellulose (grade M2500, British Celanese, -Ltd.). After stirring for 1 hour, 2.5 parts of caramel (65% dry matter) and 19.25 parts of Spanish whites were added. According to Example 1, sheets with specific gravities ranging from 0.4 to 0.8 were prepared.

Example 18

The procedure of Example 1 was followed, but 0.5 part of glycerol was added to 80 parts of water, followed by 2.75 parts of methylcellulose (Grade MC4000, Dow Chemical Company, viscosity 3500-5000 cPs in 2% aqueous solution at 20 ° C). average degree of methoxyl substitution 1.6 to 1.85 methoxyl groups per anhydroglucose unit). Stir for 1 hour and add 2.5 parts caramel (65% dry matter) ’and 19.25 parts Spanish white. According to Example 1, sheets with specific gravities ranging from 0.5 to 0.9 were prepared.

The accompanying schematic drawing shows a combination of devices with reference to examples:

The water and glycerol and then the binder and the inorganic diluent are mixed in a planetary mixer 1. The mixture is passed through a continuous high shear mixer 2 which, as shown in reference 3, can be used to control air and circulate a temperature-controlled liquid through the head of the mixer. ; the temperature is controlled by a temperature measuring device 5. From the mixer 2 the mixture enters the gate coating device 6, by means of which the mixture is applied at a controlled temperature to a continuously moving steel strip 7, on which it is conveyed through a series of drying chambers 8. Casting and drying equipment may be similar to that commonly used in the manufacture of reconstituted tobacco sheet products.

Claims (8)

11 59705 A porous tobacco substitute containing a substantially combustible substituted cellulose derivative and a water-insoluble inorganic diluent and having a reduced density by making it porous, characterized in that the tobacco substitute contains a binder consisting of partially or completely water-soluble methoxy at least 1.5 methoxyl groups per anhydroglucose unit, with a binder content of 7 to 13% by weight and a diluent content of 75 to 85% by weight of the amount of tobacco substitute, and that the tobacco substitute is made porous by introducing and dispersing air into air bubbles to form closed cells; throughout the tobacco substitute. Tobacco substitute according to Claim 1, characterized in that the binder contains further substituted, heat-gelling methylcellulose having a degree of substitution of at least 1.5 methoxyl groups per anhydroglucose unit. A tobacco substitute according to claim 1 or 2, characterized in that in addition to said heat-gelling cellulose having a high degree of substitution, the binder comprises heat-gelling cellulose having a lower degree of substitution or non-heat-gelling substituted cellulose. Tobacco substitute according to one of the preceding claims, characterized in that it contains 8 to 16% of caramel and / or tobacco extract, preferably. Tobacco substitute according to one of the preceding claims, characterized in that at least 1/10 of the binder is heat-gelled substituted cellulose having a degree of substitution of at least 1.5 methoxyl groups per anhydroglucose unit. A process for preparing a tobacco substitute according to any one of the preceding claims by mixing a substituted cellulose derivative and a water-insoluble inorganic diluent and reducing the density of the mixture by making it porous, characterized in that the binder which. consists of partially or completely water-soluble, thermally gelatable methoxyl-substituted cellulose having a degree of methoxyl substitution of at least 1.5 methoxyl groups per anhydroglucose unit, mixed with a water-insoluble inorganic diluent by stirring and reducing the density of the mixture. Process according to Claim 6, characterized in that the mixture is kept at a temperature between 35 and 60 ° C. A method according to claim 6 or 7, characterized in that the smoking material is prepared from the mixture by drying, wherein the introduction and dispersion of air is performed before the drying of the mixture.