Filter for a Smoking Article
A filter element (214) for a smoking article comprising a plug of filter material (210) having a longitudinally extending surface (213), a wrapper (220) wrapped around the longitudinally extending surface of the plug of filter material and a tobacco product (240) located between the longitudinally extending surface of the plug of filter material and the wrapper so as to cover at least a part of the longitudinally extending surface.
This invention relates to a filter for a smoking article.
BACKGROUND TO THE INVENTIONAs used herein, the term “smoking article” includes smokeable products such as cigarettes, cigars and cigarillos whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or tobacco substitutes and also heat-not-burn products.
It is well known that filtration of smoke in a smoking article such as a cigarette may adversely affect the taste and flavour characteristics of a product when smoked. Filters commonly include adsorbent materials such as activated carbon to reduce certain components of the smoke during smoking. Unfortunately activated carbon in a filter can significantly affect the taste/flavour characteristics of a cigarette.
SUMMARY OF THE INVENTIONAccording to an aspect of the invention, there is provided a filter element for a smoking article comprising a plug of filter material having a longitudinally extending surface, a wrapper wrapped around the longitudinally extending surface of the plug of filter material and a tobacco product provided between the longitudinally extending surface of the plug of filter material and the wrapper so as to cover at least a part of the longitudinally extending surface.
The tobacco product may cover only a part of the longitudinally extending surface of the plug of filter material.
The tobacco product may be provided in longitudinal stripes between the longitudinally extending surface of the plug of filter material and the wrapper.
The tobacco product may cover substantially an entire inner surface of the wrapper.
The tobacco product may be in contact with the longitudinally extending surface of the plug of filter material.
The tobacco product may be adhered to an inner surface of the wrapper.
An adhesive comprising the tobacco product may be applied to an inner surface of the wrapper.
The tobacco product may comprise shredded tobacco.
The tobacco product may comprise powdered tobacco.
The tobacco product may comprise shredded or powdered reconstituted tobacco.
The tobacco product may comprise cut tobacco.
According to another aspect of the invention, there is provided a filter for a smoking article comprising one or more of the filter elements.
A section of the filter may comprise activated carbon and the coverage of the tobacco product may be confined to the longitudinally extending surface of this section.
According to another aspect of the invention, there is provided a filter element for a smoking article, comprising a plug of filter material having a longitudinally extending surface, and a wrapper wrapped around the longitudinally extending surface of the plug of filter material, wherein the wrapper comprises reconstituted tobacco material.
The reconstituted tobacco material may be reconstituted tobacco paper.
The wrapper may comprise a plug wrap.
According to another aspect of the invention, there is provided a smoking article including the filter element described above.
According to another aspect of the invention, there is provided a filter element for a smoking article, comprising a plug of filter material having a longitudinally extending surface, and a wrapper wrapped around the longitudinally extending surface of the plug of filter material, wherein the wrapper comprises reconstituted tobacco material.
The reconstituted tobacco material may be reconstituted tobacco paper.
The wrapper may comprise a plug wrap.
15. A smoking article comprising a filter element according to claim 12, 13 or 14.
According to another aspect of the invention, there is provided a method of manufacturing a filter element for a smoking article comprising providing a tobacco product between a longitudinally extending surface of a plug of filter material and a wrapper so as to cover at least a part of the longitudinally extending surface.
The method may comprise adhering the tobacco product to an inner surface of the wrapper.
The method may comprise confining coverage of the tobacco product to only a part of the longitudinally extending surface.
The method may further comprise confining the tobacco product to the longitudinally extending surface of a section of the filter element comprising activated carbon.
The method may comprise applying an adhesive comprising the tobacco product to an inner surface of the wrapper.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings in which:
A smoking article in the form of a cigarette 100 includes a filter 200 in accordance with the invention. Referring to
The cylindrical tow of filter material comprises one or more sections, each of which may have a different material composition. In this example of the invention, as described below, each section corresponds to one of a plurality of generally cylindrical plugs of filter material 210 in one of a corresponding number of discrete filter elements which make up the filter 200. However, alternatively, the filter 200 may be of integral construction such that the individual sections correspond to portions of a single, continuous plug of filter material in a single filter element.
A general example of a filter element 214 for forming a filter 200 in accordance with the invention is described below with reference to
The plug of filter material 210 in the filter element 214 is wrapped by a layer of sheet material in the form of a wrapper, or plug wrap 220. As shown by
The plug wrap 220 may be formed of conventional paper materials. However, the plug wrap 220 may alternatively or additionally comprise tobacco or reconstituted tobacco material. The plug wrap 220 could also be formed entirely from reconstituted tobacco material, such as a sheet of reconstituted tobacco paper. The reconstituted tobacco material may have a different colour to the plug of filter material in order to provide visual differentiation. For example, the reconstituted tobacco material may have a bright colour such as yellow or blue to clearly contrast with a white cellulose acetate plug of filter material and a brown tipping paper.
Referring to
The tobacco product 240 may be adhered to the inner surface 221 of the plug wrap 220 using a suitable adhesive, such that the tobacco product 240 covers all or a part of the longitudinally extending surface 213 of the plug of filter material 210 when wrapped by the plug wrap 220. When the plug wrap 220 is wrapped around the plug of filter material 210, the tobacco product 240 may be in direct contact with the longitudinally extending surface 213 of the plug of filter material 210.
Suitably, as shown in
The first and second filter elements 214, 215 are generally cylindrical, discrete filter elements 214, 215 of substantially equivalent diameter. In this example, the filter material 210 in the second filter element 215 is composed of cellulose acetate, whilst the filter material 210 in the first filter element 214 comprises both cellulose acetate and an adsorbent such as activated carbon. The activated carbon may be in the form of granular activated carbon 216 and is distributed evenly throughout the volume of the plug of cellulose acetate 210 in a “Dalmatian” style, as is known in the art. Cross-sectional views showing this arrangement are provided in
Although the first and second filter elements 214, 215 are shown in
As shown by
Referring back to
The tobacco product 240 may, for example, affect the overall properties of the gaseous flow such that the taste and flavour of the gaseous flow are improved, making the gaseous flow more appealing to the smoker. One application of the tobacco product 240 is to replace a degree of the taste and flavour characteristics of the gaseous flow which may be lost as the gaseous flow moves through the filter material 210. In this regard, the coverage of the tobacco product 240 may be confined to the longitudinally extending surface 213 of a section of the filter material 210, either in the filter 200 or a single filter element 214, 215, which comprises activated carbon, as activated carbon is known to affect the taste and flavour of tobacco smoke. For example, as is shown in
More generally, the tobacco product 240 may be adhered to the plug wrap 220 so as to provide a substantially even coverage over the surface 213 of the filter material 210 in the filter 200. Alternatively, different areas of the surface 213 of the filter material 210, either over the whole filter 200 or a single filter element 214, 215, may be covered by different loadings of the tobacco product 240. For example, the tobacco product 240 may be provided in a plurality of stripes, as explained in more detail below.
Referring to
A possible method of applying the tobacco product 240 to the plug wrap 220 is to mix the tobacco product 240 with the adhesive 230 prior to it being applied to the plug wrap 220. Referring to
Alternatively, the adhesive 230 may be applied to the inner surface 221 of the plug wrap 220 by any other suitable application method. For example, adhesive 230 may be sprayed over the inner surface of the plug wrap 220.
Referring to
The invention also includes further modifications and variations falling within the scope of the claims.
Claims
1. A filter element for a smoking article comprising:
- a plug of filter material having a longitudinally extending surface;
- a plug wrap wrapped around the longitudinally extending surface of the plug of filter material; and
- a tobacco product provided between the longitudinally extending surface of the plug of filter material and the plug wrap and configured to cover at least a part of the longitudinally extending surface, wherein a section of the filter material comprises activated carbon and the coverage of the tobacco product is confined to a longitudinally extending surface of the section comprising activated carbon.
2. The filter element according to claim 1, wherein the tobacco product covers only a part of the longitudinally extending surface of the plug of filter material.
3. The filter element according to claim 1, wherein the tobacco product is provided in longitudinal stripes between said surface of the plug of filter material and the plug wrap.
4. The filter element according to claim 1, wherein the tobacco product is in contact with the longitudinally extending surface of the plug of filter material.
5. The filter element according to claim 1, wherein the tobacco product is adhered to an inner surface of the plug wrap.
6. The filter element according to claim 1, wherein an adhesive comprising the tobacco product is applied to an inner surface of the plug wrap.
7. The filter element according to claim 1, wherein the tobacco product comprises shredded tobacco.
8. A filter for a smoking article comprising one or more filter elements according to claim 1.
9. A filter comprising at least two filter elements according to claim 1, wherein a first of the filter elements comprises activated carbon and a second of the filter elements does not comprise activated carbon, the tobacco product covering a longitudinally extending surface of the first filter element.
10. A smoking article including the filter element according to claim 1.
11. A filter element for a smoking article, comprising:
- a plug of filter material having a longitudinally extending surface; and
- a plug wrap comprising reconstituted tobacco material wrapped around the longitudinally extending surface of the plug of filter material;
- wherein a section of the filter material comprises activated carbon and the reconstituted tobacco material is confined to a longitudinally extending surface of the section comprising activated carbon.
12. The filter element according to claim ii, wherein the reconstituted tobacco material is reconstituted tobacco paper.
13. A smoking article comprising the filter element according to claim 11.
14. A method of manufacturing a filter element for a smoking article, comprising
- providing a tobacco product between a longitudinally extending surface of a plug of filter material and a plug wrap, the tobacco product covering at least a part of the longitudinally extending surface, wherein a section of the filter material comprises activated carbon and the tobacco product is confined to a longitudinally extending surface of the section comprising activated carbon.
15. The method according to claim 14, comprising adhering the tobacco product to an inner surface of the plug wrap.
16. The method according to claim 14, comprising applying an adhesive comprising the tobacco product to an inner surface of the plug wrap.
17. A method of manufacturing a filter element for a smoking article, comprising
- providing a plug wrap comprising reconstituted tobacco material around a longitudinally extending surface of a plug of filter material, wherein a section of the filter material comprises activated carbon and the reconstituted tobacco material is confined to a longitudinally extending surface of the section comprising activated carbon.
18. The method according to claim 17, wherein the reconstituted tobacco material is reconstituted tobacco paper.
Type: Application
Filed: Jun 9, 2009
Publication Date: Jul 14, 2011
Inventor: Paulo Oliveira (Southampton)
Application Number: 12/999,437
International Classification: A24D 3/16 (20060101); A24C 5/52 (20060101);