CN102014676A - Wrapping paper for rods of smoking material - Google Patents

Abstract

The present invention relates to a wrapper (4) for smoking material rods. More particularly, the invention relates to a wrapper for smoking material rods, wherein the wrapper comprises a single sheet having two or more layers (10, 11), one of which contains an adsorbent material and a flavoring. The invention also relates to a method for preparing the wrapper and a smoking product (1) comprising the wrapper.

Description

Wrapping paper for rods of smoking material

technical field

The present invention relates to a wrapper for rods of smoking material and also to a method of making a wrapper for rods of smoking material.

Background technique

Forming the wrapper into a single sheet is known in wrappers for smoking products. For example EP-A-0407022 discloses a wrapper for smoking products, wherein the wrapper comprises a single sheet of two or more discrete webs, with at least one of the webs still being formed Combine during the wet phase before drying. In addition, EP-A-0475580 discloses a wrapper for smoking products consisting of a single sheet having two or more layers, each layer being formed from pulp and wherein at least one layer of pulp has not yet Pulp is added to each other when forming. It is disclosed in both EP-A-0407022 and EP-A-0475580 that one of the layers may contain carbon.

Flavors such as menthol have been applied to smoking products to alter their smoke and taste characteristics. Flavoring can be added to smoking products by various methods, for example by spraying a flavoring-containing solution onto tobacco or by adding flavoring to cigarette paper. However, due to the volatile or semi-volatile nature of many flavorants, considerable amounts of flavorants are lost through evaporation during production and storage of smoking products. Moreover, during smoking, most of the spices will be volatilized by the initial puff of smoke, resulting in uneven supply of spices to the smoker.

In order to avoid loss or premature volatilization of fragrances, various substances have been used to encapsulate fragrances. Various flavor encapsulation techniques involve encapsulating flavors within polysaccharide coatings. For example, EP-A-0490559 discloses a filament comprising a perfume inner core and a polysaccharide bound together with a coextensive alginate sheath coating. However, it is difficult to insert such filaments into cigarettes using conventional high speed machinery. Control of the flavor delivery provided to the smoker at specific stages during smoking is also not readily achievable with such filaments due to the necessity of precise positioning of the flavor within the cigarette.

Another encapsulation technique used in smoking products involves the microencapsulation of flavorants and incorporating the microcapsules into the tobacco blend. Disadvantages of this technique include the difficulty in achieving an even distribution of the microcapsules within the smoking product when desired, or in other words placing the microcapsules precisely at specific locations within the smoking product.

The smoking article disclosed in WO 2005/081280 comprises a rod of smokable material, a wrapper surrounding the rod of smokable material, and a wrapping material comprising absorbent material and flavourant, the wrapping material being positioned between the rod of smokable material and the wrapping paper. between and preferably adhered to the wrapper with an adhesive. The adsorbent material can be carbon. In WO 2005/082180 a filler material such as calcium carbonate and a combustion enhancer such as citrate are advantageously used. The presence of these fillers and oxidizers is often required to control ignition problems associated with the use of carbon-containing webs.

Contents of the invention

According to the present invention there is provided a wrapper for a rod of smoking material comprising a single sheet comprising two or more layers wherein a first layer comprises fibrous material and said second layer comprises absorbent material, fibrous Materials and spices.

Applicants have found that a single sheet comprising at least two layers, one of which contains absorbent material and flavorant, can be formed in which flavorant is stabilized by the absorbent material so that a rod of smoking material wrapped within the sheet does not smoke The fragrance is released earlier and the presence of fillers and accelerants to control ignition problems can be eliminated.

Furthermore, since a single sheet can be produced to have a thickness similar to conventional cigarette paper, it can be used in conventional cigarette processing machinery to produce smoking products.

A further advantage of forming the wrapper for a rod of smoking material, such as a cigarette, as a single sheet is that it can be formed remotely from the rod of smoking material processing machinery. For example, it may be shaped and then conveyed to a smoking material rod processing machine like conventional cigarette paper. This reduces the complexity of the processing machinery required by the smoking material rod manufacturer, which is advantageous since this eliminates the need for the smoking material rod manufacturer to process the sheet itself. Thus, the present invention can allow manufacturers of smoking material rods to produce improved smoking rods without any modification or replacement of their existing machinery.

A single sheet comprising at least two layers, with one layer comprising carbon and flavor wrapper, has the further advantage that when used to wrap rods of smoking material it may reduce some of the constituents of the smoke generated by rods of smoking material during use.

The use of wrappers according to the invention makes it possible to avoid or reduce problems related to soot characteristics and ignition.

Although the sheet may comprise more than two layers, the sheet may also be a bilayer sheet, that is, have only two layers.

The fibrous material present in the first and/or second layer is preferably a cellulosic material. More preferably, the cellulosic material is in the form of a paper material. The fibrous material may for example be present in the second layer in an amount of up to 40 gsm. The fibrous material may for example be present in the second layer in an amount of up to 20 gsm. The total amount of fibrous material within the sheet may be at least 17 gsm. The total amount of fibrous material in the sheet may be up to 60 gsm.

Fragrances may be selected from the following compound types: (natural and/or artificial) menthol, alcohols, esters, ketones, lactones, essential oils, aldehydes and heterocyclic compounds. A variety of other flavors may also be suitable. One flavor is menthol.

A single sheet may include one or more oxidizers. Examples of suitable burners include citrates such as sodium citrate and potassium citrate, cellulose acetate and phosphate compounds. The one or more combustion enhancers may include sodium citrate or potassium citrate. The one or more combustion enhancers may be tripotassium citrate. One or more oxidizers may be present in the first layer and/or the second layer. The one or more combustion enhancers may be present, for example, in an amount of at least 0.5% by weight based on the weight of the sheet. One or more combustion enhancers may be present, for example, in an amount up to 1% by weight based on the weight of the sheet. The one or more combustion enhancers may be present, for example, in an amount of 0.5% to 1% by weight based on the weight of the sheet.

The one or more adsorbent materials present in the second layer may be selected from one or more of the following: zeolite, sepiolite, clay, activated alumina, ore, resin and carbon. The adsorbent material can be carbon. The adsorbent material can be activated carbon. Any form of activated carbon can be used. Carbon activity is measured as percent carbon tetrachloride (CTC), a measure well known in the art. Activated carbon may have a activity rating (CTC) of from 60 to 130, and preferably from 80 to 120, and suitably around 100 activity rating. The one or more adsorbent materials may, for example, be particulate, powdered or granular. Adsorbent material may for example be present in the second layer in an amount of up to 40 gsm.

In other words, the second layer can be carbon paper.

The total amount of absorbent material in the sheet may for example be up to 40 gsm.

The first layer and/or the second layer may for example comprise one or more filler materials. Non-exhaustive examples of suitable filler materials include calcium carbonate, titanium dioxide, magnesium oxide, calcium sulfate, clay and kaolin. One or more filler materials may consist of calcium carbonate. One or more filler materials may, for example, be present in the second layer in an amount of up to 25 gsm. One or more filler materials may, for example, be present in the first layer in an amount of up to 15 gsm. The total amount of filler material within the sheet may for example be at least 8 gsm. The total amount of filler material in the wrapper may for example be up to 40 gsm.

The wrapping paper can, for example, have a thickness of at least 45 μm. The wrapping paper can have a thickness of at most 250 μm, for example.

The second layer covers at least a portion of one side of the first layer. In an embodiment of the present invention, the second layer may cover the entire surface of one side of the first layer. It should be understood that where more than two layers are present in a single sheet, the second layer may be separated from the first layer by one or more additional layers.

In certain embodiments of the invention, the second layer includes one or more diluents.

One or more fragrances may be added to the absorbent material prior to forming the second layer. For example, fragrance can be added to the sorbent material by spraying.

Optionally, one or more fragrances may be added to the second layer after the second layer has been formed. Another alternative is that wherein the one or more fragrances are added to said second layer after the wrapper has been formed.

For example, fragrance may be added to the second layer, eg, as one or more fragrance streams, using a fragrance addition device. Suitably, multiple perfume streams are applied to the second layer in a line or in an array. When added in an array, the array may include two flavor streams, one of which is offset from the flavor stream in an adjacent line. Suitably, perfume is applied to the surface of the second layer in 1 to 30 perfume streams and preferably in 4 to 18 perfume streams.

If the fragrance is solid at room temperature, the fragrance may be heated during addition to the sorbent material or second layer to maintain it in a molten liquid state and may be heated to a temperature of 40°C to 45°C.

The wrapper may be formed by any suitable method so long as the resulting wrapper consists of a single sheet. The term "single sheet" as used herein refers to a sheet in which the layers of the sheet are integral: the layers are not merely placed next to each other or adhered to each other using, for example, an adhesive together (i.e. as is the case in WO 2005/082180).

In an embodiment of the invention, the wrapper in the form of a single sheet is formed by combining two or more plies to form a single sheet while at least one of the plies is in a wet stage before drying in forming. For example, where the wrapper is a two-ply sheet, the layers can be combined with one of the layers in a wet stage prior to drying in forming or with both layers in a wet stage before drying in forming.

The present invention therefore also provides a method of making a wrapper according to the invention, which method comprises combining said layers while at least one of said layers is still in a wet stage before drying in forming.

A suitable apparatus for producing packaging paper can be, for example, a multiple-wire paper machine, such as a twin-wire paper machine. Such machines are known in the papermaking art.

After combining the layers, the formed sheet is usually dried.

The invention further provides a smoking article as claimed.

In an embodiment of the smoking article, a second layer of wrapper is provided on the smoking material rod side of said wrapper, which may be more aesthetically pleasing to the smoker. That is, the second layer comprising absorbent material is arranged between the first layer and the rod of smoking material such that the second layer is not visible to the smoker. This allows the sorbent material to be relatively close to the smoke flowing through the smoking product, thereby allowing the sorbent material to interact better with constituents of the smoke than if the second layer were the outer layer. Thereby, the removal of vapor phase components is enhanced. This also allows the appearance of the tipping paper to be unaffected or less affected. This is particularly useful where the adsorbent material in the second layer is carbon.

The smoking material may be a tobacco-containing smoking material or a non-tobacco smoking material. The smoking material may be tobacco-containing smoking material or tobacco material. Suitably, the tobacco material comprises one or more of tobacco stems, tobacco leaves and tobacco dust. An example of a tobacco material is a material containing one or more of the following types of tobacco: Virginia or flue-cured tobacco, Burley tobacco, Oriental tobacco, reconstituted tobacco, and tobacco stems. Smoking materials may include blends of tobacco materials.

In an embodiment of the invention, the smoking article includes a filter element at one end of the rod of smoking material.

The filter element may be a multi-section filter comprising a plurality of segments such as a two-section or three-section filter. Suitable filters are known to those skilled in the art. The filter element may contain one or more adsorbent materials for reducing the vapor phase constituents of the smoke. Such filters known in the art include Dalmation filters, in which particulate adsorbent material is dispersed in a fibrous filter material, such as cellulose material, and cavity filters, in which the hollow portion of a multi-knotted filter contains one or more adsorbent materials. When the second layer is located near the mouth end of the smoking article, it has been found that flavorants can be released from the second layer during smoking of the smoking article without being absorbed by the sorbent material in the filter and without contributing to the vapor phase reduction in the smoke. Components negatively affect the adsorption capacity of the filter.

The one or more adsorbent materials, when present in the filter of the smoking product, may be one or more of the following: zeolite, sepiolite, clay, activated alumina, ore, resin or carbon, especially activated carbon.

In an embodiment of the smoking article of the invention, the smoking article comprises a filter element, the filter element comprises a filter rod, and the filter rod comprises one or more adsorbent materials. The filter rod may comprise a mouth end portion of cellulose acetate and a Dalmation stem portion containing absorbent material at the rod end of the smoking material of the filter element. Alternatively, the filter rod may be a cavity filter comprising two ends and a central cavity containing said sorbent material.

The filter element may optionally comprise a filter rod of homogeneous filter material, tipping paper surrounding the filter rod, circumferentially spaced longitudinally extending grooves on the filter rod, and interconnecting the filter element with the tobacco rod ventilating tipping paper of a plurality of grooves opening on the side of the tobacco rod and continuously covering only a part of the length of the filter element and thus not extending up to the mouth end of the filter element, the grooves being arranged axially with respect to the filter axis, Ventilation air enters the axially extending grooves through the overlying ventilation tipping paper, while all mouth protruding grooves are unventilated.

The filter element may be connected to the rod of tobacco material, for example by tipping paper. The tipping paper may wrap the entirety of the filter element and extend along part of the length of the rod of smoking material. Alternatively, the tipping paper may be a narrow strip of material covering only a portion, eg a small portion, of the length of the filter element and rod of smoking material.

By practicing the present invention, one or more of the following wrapping papers may be provided:

- a wrapper in which flavorant is added and stabilized therein so that no flavorant is released until a rod of smoking material wrapped in such wrapper is smoked;

- It is possible to avoid or reduce wrappers in which filler materials such as chalk and/or combustion accelerants such as citrate are added to the layer containing the adsorbent in order to control ignition problems;

- wrappers that can be used to shape smoking products and reduce vapor phase components and tars that are generated during smoking of the tobacco product and delivered to the mouth of the smoker;

- a wrapper that can be processed to have a thickness similar to that of conventional cigarette paper to enable the wrapper to be used in conventional smoking product (eg cigarette) processing machinery used to produce smoking products and thereby avoid increased machinery costs;

- Wrapping paper, which can be produced away from the smoking product processing machinery, because in this way the smoking product manufacturer does not need to process the sheet material itself, thus reducing the complexity of the processing machinery required by the smoking product manufacturer, which is favorable; and

- It is possible to avoid wrappers in which it is often necessary to include filler materials and/or accelerants in order to control ignition problems associated with the use of carbon in smoking product wrappers.

Description of drawings

Embodiments of the present invention are now introduced as examples with reference to the accompanying drawings, in which:

Figure 1 shows a longitudinal section through a smoking article comprising a wrapper according to the invention;

Figure 2 shows the two layers used to make the wrapper for the smoking product of Figure 1;

Figure 3 shows a cross-sectional view through the smoking product of Figure 1 along the line x-x;

Fig. 4 shows a flowchart of the manufacturing process of the two-layer wrapping paper in Fig. 2 .

Detailed ways

Figure 1 shows a smoking article 1 in longitudinal section. The smoking article 1 comprises a rod 2 of smokable material wrapped by a wrapper 4 . The filter rod 3 is located at the mouth end of the smoking product 1 . Filter rod 3 is packed by tipping paper 5. The filter rod 3 is connected to the smokeable material rod 2 by means of tipping paper 6 . The wrapper 4 is a single sheet made by crimping two plies of paper together as described below. The thickness of the wrapper 4 is similar to conventional cigarette paper.

The tipping paper 5 covers the entire length of the filter rod 3 along the longitudinal axis of the smoking article 1 . The tipping paper 5 thus wraps the entire radial surface of the filter rod 3 .

The wrapper 4 covers the entire length of the ignitable smoking rod 2 along the longitudinal axis of the smoking article 1 . The wrapping paper 4 thus wraps the entire radial surface of the ignitable suction rod 2 .

The wrapper 4 and the tipping paper 5 meet at the border of the filter rod 3 and the ignitable smoking rod 2 . The wrapping paper 4 and the tipping paper 5 do not overlap each other. Wrapping paper 4 and tipping paper 5 are at least partially wrapped by tipping paper 6 . The tipping paper 6 can cover the entire length of the filter rod 3 and part of the length of the ignitable suction rod 2 . Optionally, the tipping paper 6 may only cover part of the filter rod 3 and part of the length of the ignitable suction rod 2 .

The tipping paper 5 can be omitted. In this case, the tipping paper 6 covers the entire length of the filter rod 3 and part of the length of the ignitable suction rod 2 and thus also assumes the function of the tipping paper 5 .

The filter rod 3 may optionally include a filter rod made of a homogeneous filter material, tipping paper for wrapping the filter rod, circumferentially spaced grooves extending longitudinally on the filter rod, and a filter element interlaced with the tobacco rod. continuous venting tipping paper, a plurality of grooves opening on the side of the tobacco rod and covering only a part of the length of the filter element continuously, and therefore not extending up to the mouth end of the filter element, the grooves are arranged axially with respect to the filter axis , ventilated air enters the axially extending grooves through the overlying ventilated tipping paper, while all mouth protruding grooves are not ventilated.

Figure 2 shows the two layers making up the wrapper 4 of the smoking article 1 . The first layer 10 consists of a fiber material. The second layer 11 consists of absorbent material, fibrous material and perfume. In this example, the adsorbent material is carbon. Fibrous materials are cellulosic materials such as paper. The flavor can be, for example, a menthol flavor. The two layers 10, 11 are integral: they are not just placed next to each other or adhered to each other using eg an adhesive, but are formed as a single sheet. Sheets can be bonded together by fiber bonding inherent in the papermaking process. Wrap 4 was formed using a twin wire process as described below.

Figure 3 shows a cross-section through the smoking article 1 in Figure 1 along the line x-x in Figure 1 . This figure shows the double wrapper 4 wrapping the ignitable smoking rod 2 as shown in FIG. 1 . The second layer 11 is the inner layer adjoining the ignitable suction wand 2 . The first layer 10 is the outer layer. The outer surface of the first layer 10 corresponds to the outer surface 1 of the wrapper 4 .

The ignitable smoking rod 2 comprises smoking material. The smoking material is a tobacco-containing smoking material or a non-tobacco smoking material. The smoking material may be tobacco-containing material or tobacco material. Suitably, the tobacco material comprises one or more of tobacco stems, tobacco leaves and tobacco dust. An example of a tobacco material is a material containing one or more of the following types of tobacco: Virginia or flue-cured tobacco, Burley tobacco, Oriental tobacco, reconstituted tobacco, and tobacco stems. Smoking materials may include blends of tobacco materials.

When smoking, the smoking article 1 is ignited at the end farthest from the filter rod 3 . Smoke is drawn towards the smoker along the ignitable suction rod 2 . As the smoke travels along the smoking article 1, flavor is released from the second layer 11 of the wrapper 4 when the temperature becomes sufficient to promote release of flavor from the carbon. If the second layer 11 of the wrapper 4 is evenly distributed with fragrance, then the fragrance experience can be relatively uniform.

The filter rod 3 may be a multi-section filter including multiple segments, such as a double-section or three-section filter. Suitable filters are known to those skilled in the art. The filter 3 may comprise an adsorbent material such as activated carbon for reducing vapor phase components in the smoke. Suitable filters include Dalmation filters, in which particulate absorbent material is interspersed in a fibrous filter material, such as cellulose material, and cavity filters, in which the hollow portion of a segmented filter contains one or more absorbent materials Such as activated carbon. When the second layer is located near the mouth end of the smoking article, it has been found that flavorants can be released from the second layer during smoking of the smoking article without being absorbed by the sorbent material in the filter and without contributing to the vapor phase reduction in the smoke. The filter absorbency of ingredients can be negatively affected.

FIG. 4 is a flow chart showing a method of manufacturing the double wrapping paper 4 .

In step S1, the first layer 10 and the second layer 11 are fabricated respectively. The first layer 10 and the second layer 11 have different compositions. Layers 10, 11 may have different thicknesses.

The first layer 10 comprises fibrous material and fillers.

Fibrous materials are cellulosic materials. In particular, the cellulosic material is a paper material.

Fillers can be calcium carbonate (chalk), titanium dioxide, magnesium oxide, calcium sulfate, clay and kaolin. Advantageously, the filler is calcium carbonate. The filler material(s) may be present in the second layer in an amount up to 25 gsm. The filler material(s) may be present in the first layer in an amount up to 15 gsm. The total amount of filler material in the sheet may for example be at least 8 gsm. The total amount of filler material in the wrapper may eg be up to 40 gsm.

The second layer 11 comprises absorbent material, fibrous material and fragrance.

Fibrous materials are cellulosic materials. In particular, the cellulosic material is a paper material. The amount of fibrous material present in the second layer 11 is at most 40 gsm. The amount of fibrous material present in the first layer 11 is at most 20 gsm.

The adsorbent material may be carbon or may be another suitable adsorbent. The adsorbent material can be activated carbon. Any form of activated carbon can be used. Activated carbon may have a activity rating (CTC) of from 60 to 130, advantageously between 80 and 120, and advantageously close to 100 activity rating. The adsorbent material is advantageously powdery or granular, or may be particulate. The amount of adsorbent material present in the second layer is at most 40 gsm.

Fragrances may be any of the following: (natural and/or artificial) menthol, alcohols, esters, ketones, lactones, essential oils, aldehydes and heterocyclic compounds. It is also possible to additionally use different suitable fragrances. The fragrance is added to the absorbent material before forming the second layer. Fragrance may be added to the second layer 11 by spraying after inclusion of the sorbent material. For example, fragrance may be added to the second layer, eg, as one or more fragrance streams, using a fragrance addition device. Suitably, multiple perfume streams are applied to the second layer in a line or in an array. When added in an array, the array may include two flavor streams, one of which is offset from the flavor stream in the adjacent lane. Suitably, perfume is applied to the surface of the second layer in 1 to 30 perfume streams and preferably in 4 to 18 perfume streams. If the fragrance is solid at room temperature, the fragrance may be heated during addition to the second layer 11 to keep it in a molten liquid state and may be heated to a temperature of 40 to 45°C.

Optionally, the fragrance can be added to the second layer 11 after the double layer paper has been formed.

In certain embodiments, the second layer also includes filler. Fillers can be calcium carbonate (chalk), titanium dioxide, magnesium oxide, calcium sulfate, clay and kaolin. Advantageously, the filler is calcium carbonate. The amount of filler material present in the second layer is at most 25gsm.

Also when considering the first layer 10 and the second layer 11 individually, it may be useful to consider the material and physical properties of the resulting paper when determining which components to use for the layers 10,11.

The two-layer sheet has a thickness of at least 45 μm. The two-layer sheet has a thickness of at most 250 μm.

The total amount of filler material in the sheet is at least 8 gsm. The total amount of filler material in sheet 8 is at most 40 gsm.

The total amount of fibrous material in the sheet is at least 17 gsm. The total amount of fibrous material in sheet 8 is at most 60 gsm.

In step S2, the first ply 10 and the second ply 11 are crimped together using a twin wire paper machine to form a single sheet. Twin-wire paper machines are well known in the prior art and therefore will not be described in detail in this step. The result is a sheet comprising a moist web having a first layer 10 and a second layer 11 . Damp rolls are flat and wrinkle-free.

In step S3, the wet homogenate is dried using a series of drying rollers to form a sheet.

In step S4, the sheet is size pressed to add a combustion enhancer, in this example citrate. Examples of suitable burners include citrates such as sodium citrate and potassium citrate, cellulose acetate and phosphate compounds. The one or more combustion enhancers may include sodium citrate or potassium citrate. Tripotassium citrate has certain advantages as a combustion aid in the case of two-ply wrappers. The combustion enhancer is present in an amount of at least 0.5% by weight based on the weight of the sheet. The combustion enhancer is present in an amount of up to 1% by weight based on the weight of the sheet. Although step 4 is included in this embodiment, the addition of a combustion enhancer such as citrate to the second layer 11 may also be omitted. In fact, the use of double wrap paper reduces the need to use accelerants. Therefore, use of the present invention avoids the use of combustion accelerants. Optionally, if a oxidizer is used, the amount of oxidizer may also be less than conventionally used to achieve a given combustion characteristic.

In step S5, the sheet is dried again using a series of drying rollers. At step S6, the dried sheet is rolled onto a roll for storage and/or transport.

The dried sheet can then be used as wrapping paper for smoking products such as cigarettes produced using conventional cigarette making machinery. The main structural difference between the resulting cigarettes and conventional cigarettes is the composition of the wrapper.

Claims (35)

1. A wrapper for smoking material rods comprising a single sheet comprising two or more layers wherein: the first layer comprises fibrous material, and The second layer includes absorbent material, fibrous material and fragrance. 2. The wrapper of claim 1, wherein the sheet is a two-ply board. 3. A wrapper as claimed in claim 1 or claim 2, wherein in the second layer the fibrous material is a cellulosic material. 4. A wrapper as claimed in any one of the preceding claims, wherein the single sheet comprises a burner. 5. The wrapper of claim 4, wherein the burn enhancer is citrate. 6. A wrapper as claimed in claim 4 or claim 5, wherein the burner is present in the second layer. 7. A wrapper as claimed in any one of claims 4 to 6, wherein the flame retardant is present in an amount of at least 0.5% by weight, based on the weight of the sheet. 8. A wrapper as claimed in any one of claims 4 to 7, wherein the flame retardant is present in an amount of up to 1% by weight, based on the weight of the sheet. 9. A wrapper as claimed in any one of the preceding claims, wherein said fibrous material in said first layer is a cellulosic material. 10. A wrapper as claimed in any one of the preceding claims, wherein the adsorbent material is carbon. 11. The wrapper of claim 10, wherein the carbon is activated carbon. 12. The wrapper of claim 11, wherein the activated carbon has a activity rating (CTC) of 60-130, or 80-120, or about 100. 13. A wrapper as claimed in any one of the preceding claims, wherein the second layer comprises a filler material. 14. The wrapper of claim 13, wherein the filler material comprises calcium carbonate. 15. A wrapper as claimed in claim 13 or claim 14, wherein the filler material is present in the second layer in an amount of up to 25 gsm. 16. A wrapper as claimed in any one of claims 13 to 15 wherein the total amount of filler material within the sheet is at least 8 gsm. 17. A wrapper as claimed in any one of the preceding claims, wherein the second layer comprises a diluent. 18. A wrapper as claimed in any one of the preceding claims wherein said two or more plies are combined to form said single sheet while at least one ply is in a wet stage prior to drying in forming. 19. A wrapper as claimed in claim 18, wherein the plies are combined while the two plies are in a wet stage before drying in forming. 20. A smoking product comprising: rods of smoking material; and A wrapper for wrapping said rod of smoking material as claimed in any one of claims 1 to 19. 21. The smoking article as claimed in claim 20, wherein the second layer of wrapper is disposed on the smoking material rod side of the wrapper. 22. A smoking article as claimed in claim 20 or claim 21 which includes a filter element at one end of the rod of smoking material. 23. The smoking article of claim 22, wherein the filter element comprises carbon. 24. The smoking article of claim 23, wherein the carbon is activated carbon. 25. The smoking article as claimed in claim 23 or claim 24, wherein the filter element comprises a mouth end portion of cellulose acetate and a Dalmation stem portion containing the carbon at the smoking material stem end of the filter element. 26. The smoking article as claimed in claim 23 or claim 24, wherein the filter element is a cavity filter comprising two ends and a central cavity containing the carbon. 27. A smoking article as claimed in any one of claims 20 to 26 which is a cigarette. 28. A method of making a smoking material rod wrapper comprising combining a first layer comprising fibrous material with a second layer comprising absorbent material, fibrous material and flavourant into a single sheet. 29. The method of claim 28, comprising combining said layers while at least one of said layers is still in a wet stage in forming prior to drying. 30. A method as claimed in claim 28 or claim 29 comprising combining the two or more plies using a multi-wire paper machine to form the wrapper. 31. The method of claim 30, wherein the sheet is a two-ply sheet and the multi-wire paper machine is a twin-wire paper machine. 32. A method as claimed in any one of claims 28 to 31 , comprising drying the formed sheet after combining the layers. 33. A method as claimed in any one of claims 28 to 32, comprising incorporating the fragrance into an absorbent material prior to forming the second layer. 34. A method as claimed in any one of claims 28 to 33, comprising adding the fragrance to the second layer after forming the layer. 35. A method as claimed in any one of claims 28 to 33, comprising adding the fragrance to the second layer after forming the wrapper.

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