TW201507639A - Smoking article - Google Patents

Abstract

A smoking article comprises a wrapped tobacco rod (1) and a filter (2), (3), the wrapped tobacco rod (1) and the filter (2), (3) being connected by a tipping paper (4) which overwraps the filter (2), (3) and a part of the wrapped tobacco rod (1). The tipping paper (4) is designed as a single-ply tipping paper and contains activated carbon.

Description

Smoking items Field of invention

The present invention relates to smoking articles, such as filter cigarettes.

Background of the invention

Smoking is known to cause smelly fingers. During the smouldering phase of a cigarette, sidestream smoke is emitted from the burning end. Depending on the angle at which the cigarette is held, a portion of this sidestream extends the cigarette and contacts the finger of a smoker. The odorous component of the sidestream smoke can deposit on the skin, resulting in a long, unpleasant finger taste.

The use of absorbent materials (eg, charcoal materials or activated carbon) in cigarette papers and filters is widely used to reduce the level of volatile smoke constituents.

WO 2008/043988 A1 discloses a carbonaceous paper which is used as a filter plug wrap. The core of the associated filter also contains carbon. A filter according to this document can be attached to a cigarette rod using a conventional filter paper so that the carbon paper is not directly exposed to the outer surface of the cigarette.

WO 2009/109427 A1 describes the use of a tobacco covering material consisting of a plurality of layers comprising a layer of activated carbon and a perfume. The carbon layer is on the tobacco side of the cladding material to allow for better flavor release and Interact with mainstream smoke.

In WO 2009/109433 A1, a carbonaceous filter wrap or filter paper consisting of a plurality of layers is described, one of which comprises an absorbent material such as activated carbon. This carbon-containing laminate is directed towards the inside of the smoking article to allow interaction with mainstream smoke. Another layer that does not contain any absorbent forms the outer surface of the plug wrap or filter paper.

Summary of invention

It is an object of the present invention to provide a smoking article that reduces the taste of a finger that is typically caused by smoking.

This goal is achieved by a smoking article having the features of claim 1. Advantages of the invention are set forth in the dependent claims.

The smoking article (e.g., a cigarette) according to the present invention comprises a wound tobacco rod and a filter. The wound tobacco rod and the filter are joined by a filter paper that coats the filter and a portion of the wound tobacco rod. The filter paper is designed as a single layer of filter paper and contains activated carbon.

The tobacco rod of the smoking article can be entangled with a suitable cigarette paper, as is well known in the art. The filter can be designed as a single or multiple filter that can be wound with a filter rod forming paper. The wound tobacco rod and the filter are coaxially aligned and wound by the filter paper. Thus, the filter paper is always the outermost layer in the filter area of the smoking article.

The filter paper consists of a single layer comprising activated carbon (active charcoal). The term "single layer" does not exclude an optional additional coating (see below), but Indicates that there is only one paper layer. Activated carbon can be added during, for example, the paper making process, so it is inherently included in the filter paper. Suitable paper stocks are disclosed in WO 2008/043988 A1 (see above) and are commercially available, for example, from Saber Swiss Quality Paper. These lines are often referred to as "carbon paper." The activated carbon can also be applied to the outer surface of a conventional filter paper by suitable methods, such as coating or printing, after the paper is manufactured. It is conceivable that activated carbon can be applied to the outer surface of a filter paper which has inherently included activated carbon.

In the smoking article according to the present invention, the activated carbon is present on the outer surface of the filter end of the smoking article, and the smoking article is usually held, so during use of the smoking article, The activated carbon is placed close to the finger of the smoker. The activated carbon can interact with the sidestream smoke that passes along the surface of the cigarette and absorbs odorous sidestream smoke constituents. Another way of interaction is by the direct contact between the activated carbon and the fingers, so that volatile substances that have been deposited on the skin with odor can be absorbed by the activated carbon.

In an advantageous embodiment of the invention, the filter paper has an active carbon content in the range of from 5% to 50% by weight, or, preferably, from 15% to 30% (in terms of Within the range of weights).

As already mentioned, activated carbon can be applied to the outward direct surface of the filter paper, i.e. to the surface of the filter paper that is directed outwardly (exposed) to the finished smoking article. The applying step can be carried out, for example, by coating or printing, preferably after the paper making process and at the filter paper region where the filter paper is wound around the filter and the wound tobacco rod. before.

Due to the specific manufacturing process of carbon paper, carbon paper typically has a high natural porosity (inherently, the porosity ratio, i.e., the porosity measured when it is not artificially increased by venting holes). This inherent porosity can be measured in Coresta units (CU); 1 CU = 1 cm ³ / (cm ² .min. kPa). Preferably, the activated carbon containing filter paper has an intrinsic porosity of at least 50 CU. By using this type of paper stock as a filter material, preferentially combined with a porous filter rod forming paper, the carbon monoxide (CO) included in the mainstream smoke can be diffused through the filter rod forming paper and the filter paper. , which reduces the CO level in mainstream smoke. This is particularly beneficial if the tobacco rod is wound with a low side flow paper (see below) as these paper materials tend to increase the CO level in mainstream smoke. In order to achieve the desired level of filter ventilation, the filter paper can be additionally perforated, either before or after it is wrapped around the smoking article.

In an advantageous embodiment of the invention, the filter paper comprising activated carbon comprises a coating applied at least partially to its outwardly facing surface. This coating can improve, for example, the tactile and/or visual properties of the filter paper. For example, a lip release can be promoted by a coating, or a colored or white varnish that alters the appearance of the filter paper containing activated carbon. The term "coating" also encompasses plural applications such as a porous varnish that penetrates into the pores of the activated carbon containing filter paper. Such coatings may be applied, preferably before the filter paper is wrapped around the filter and the wrapped tobacco rod, for example by spraying or printing.

Even without such a coating or partial coating, the activated carbon in the filter paper generally adheres well to the paper layer and is taken and used by the consumer. The smoking article does not cause colored fingers when smoking.

As already described, the filter paper comprising activated carbon can comprise artificial perforations which can cause the smoking article to have a filter ventilation rate in the range of from 10% to 90%. Such artificial perforations are preferably fabricated by electroporation or laser perforation, as is well known in the art. In the case where any coating of the filter paper reduces the porosity of the filter paper, such artificial perforations can be used to adjust the filter ventilation rate to a desired value.

Typically, the filter paper comprising activated carbon has an areal weight of from 20 g/m ² to 80 g/m ² .

In general, the tobacco rod can be wrapped around a conventional cigarette paper (typically having a void ratio in the range from 5 CU to 400 CU). In an advantageous embodiment of the invention, the tobacco rod is wound with a low side stream ("LSS") cigarette paper (or wrapped in a plurality of layers of cigarette paper, which also has a side flow reduction effect). LSS cigarette papers are commercially available, for example, from the Delfort Group, and typically contain relatively high CaCO ₃ fillers and the like or specific fillers such as MgO. By using an LSS cigarette paper, a lower amount of sidestream smoke is released from the smoking article during the smoldering, which adds an effect to the filter paper containing activated carbon in reducing the taste of the finger.

Typically, the filter can comprise a filter section or more than one filter section. In a beneficial embodiment, at least one of the filter sections may comprise an adsorbent, preferably activated carbon. The adsorbent is used to alter the composition of mainstream smoke and also has a reduced taste of the waste cigarette butt. The adsorbent can be added to the filter material and/or contained in a separate filter compartment, as is generally known in the art.

The filter can be wound into a porous plug wrap, preferably having a porosity ranging from 100 CU to 40,000 CU. CU: Coresta unit. 1 CU = 1 cm ³ / (cm ² .min. kPa). However, a non-porous plug wrap can also be used. The plug wrap may alternatively comprise activated carbon or another adsorbent. In any case, the plug wrap is covered by the filter paper.

In addition to or in place of activated carbon, it is also envisioned that the filter paper comprises at least one adsorbent other than activated carbon. Examples of such adsorbents are zeolites, alumina, cerium oxide, cerium oxide gels, ion exchange resins, polyester resins, sepiolite, and carbon materials such as impregnated carbon, activated carbon fibers, and highly activated carbon.

In a further embodiment of the invention, the filter of the smoking article has special design features, such as a colored tow (eg, colored cellulose acetate tow), at the mouth of the filter A side recess or a shaped hollow aperture member at the side end is known to those skilled in the art.

1‧‧‧Tobacco stick

2, 3‧‧‧ filter

4‧‧‧ filter paper

In the following content. The invention is explained in more detail by way of embodiments and examples. 1 is a perspective view of an embodiment of the smoking article in accordance with the present invention, wherein a portion of a filter paper that attaches a wrapped tobacco rod to a filter is shown as un Winding, and Figure 2 is a pictorial cross-sectional view of the embodiment of Figure 1, taken from a plane cut through the filter.

Detailed description of the preferred embodiment

Figure 1 shows a cigarette as an example of a smoking article in a longitudinal view. The cigarette comprises a entangled tobacco rod 1 comprising an amount of tobacco blend wrapped in a cigarette paper, and a filter. The filter comprises a filter material 2, for example cellulose acetate, which is wound in a plug wrap 3 . The filter is attached to the wound tobacco rod 1 by a filter paper 4 which coats the filters 2, 3 and a portion of the wound tobacco rod 1. The filter paper 4 is shown as partially unwound for display purposes. Typically, the filter can be designed as a filter having one or more sections.

Figure 2 is a schematic cross-sectional view of the cigarette of Figure 1 showing the filter material 2, the plug wrap 3, and the filter paper 4 as being cut through the filter. The plug wrap 3 can form a step in this region where it overlaps (not shown in Figure 2). The same is true for the filter paper 4. Figure 2 is not drawn to scale.

To date, the set-up of cigarettes is well known in the art.

According to the invention, the filter paper 4 is designed as a single-ply tipping paper and contains activated carbon. In this embodiment, the color of the filter paper 4 is dark gray. Many possible features of the filter paper 4 and other portions of the smoking article have been explained above.

In the following, these properties of the three specific cigarettes (Examples 1 to 3) were compared with each other. Example 1 relates to a reference cigarette wherein the filter paper does not contain activated carbon. In Example 2, the cigarette paper was a low side flow paper (LLS), and the filter paper still contained no activated carbon. In the cigarette of Example 3, the cigarette paper is a low side flow paper (LLS), and the filter paper is a single layer filter paper and contains a living Carbon. In another example (not shown in detail), the filter paper is as in Example 3, a single layer filter paper containing activated carbon, but the cigarette paper is a conventional cigarette paper as in Example 1.

Example 1: Reference cigarette

American Blend cigarette with a single acetate filter and a cigarette paper having a basis weight of 24.5 g/m ² , a 27% by weight CaCO ₃ filler, and a hole rate of 24 CU. A conventional non-porous filter is used on a standard cigarette maker. Made of paper. The cigarettes were perforated by a line of laser to achieve a target filter ventilation rate of 44%.

Example 2: Reference cigarette with LSS paper

An American Blend cigarette similar to Example 1 was made with a low sidestream cigarette paper having a basis weight of 45 g/m ² , a 45% by weight CaCO ₃ filler, and a void ratio of 6 CU. The cigarettes were perforated by a line of lasers to achieve a target filter ventilation rate of 41%.

Example 3: Cigarette with LSS paper and carbon filter paper

The American Blend cigarette of Example 2 was made from a single layer filter paper containing activated carbon and having a basis weight of 50 g/m ² (including the activated carbon), a carbon content of 30% by weight, and a porosity of 1200 CU. The cigarettes were perforated by a line of laser to achieve a target filter ventilation rate of 43%.

Table 1 shows the physical data and smoke production values of the cigarettes according to Examples 1 to 3. NFDPM (excluding nicotine dry particulate matter, "nicotine (tar)"), nicotine and CO based on DIN/ISO 4387 (NFDPM), DIN/ISO 10315 (nicotine), and DIN/ISO 8454 (CO) .

Comparison of the CO yields and CO/NFDPM ratios in Table 1. It was confirmed that the CO increase portion caused by the use of an LSS paper can be compensated for by using a porous filter paper containing one of activated carbon.

What is more, the cigarette according to Example 3 was smoked by a tester for a period of one week. These participants reported that less finger odor was observed than their usual brands.

1‧‧‧Tobacco stick

2, 3‧‧‧ filter

4‧‧‧ filter paper

Claims (12)

A smoking article comprising a wrapped tobacco rod and a filter, the wound tobacco rod and the filter being connected by a filter paper wrapped around the filter and a portion of the wound tobacco rod The filter paper is characterized in that it is designed as a single layer of filter paper and contains activated carbon. A smoking article according to claim 1, characterized in that the filter paper has an active carbon content ranging from 5% by weight to 50% by weight. A smoking article according to claim 2, characterized in that the filter paper has an active carbon content ranging from 15% by weight to 30% by weight. A smoking article according to any one of claims 1 to 3, characterized in that the activated carbon system is inherently included in the filter paper. A smoking article according to any one of claims 1 to 4, characterized in that activated carbon is applied to the outwardly facing surface of the filter paper. A smoking article according to any one of claims 1 to 5, characterized in that the filter paper comprising activated carbon has an intrinsic porosity of at least 50 CU. A smoking article according to any one of claims 1 to 6, characterized in that the filter paper comprising activated carbon comprises at least a portion of the coating on its outwardly facing surface. A smoking article according to any one of claims 1 to 7, characterized in that the filter paper containing activated carbon comprises artificial perforation, resulting in a filter ventilation rate ranging from 10% to 90% of the smoking article, wherein Artificial perforations are preferably electroporation or laser perforation. A smoking article according to any one of claims 1 to 8, characterized in that the filter paper containing activated carbon has an areal weight ranging from 20 g/m ² to 80 g/m ² . A smoking article according to any one of claims 1 to 9, characterized in that the tobacco rod is wound with a low side stream cigarette paper or by a plurality of layers of cigarette paper having a side stream reducing effect. A smoking article according to any one of the preceding claims 1 to 10, characterized in that the filter comprises at least one filter section comprising an adsorbent, preferably activated carbon. A smoking article according to any one of the preceding claims 1 to 11, characterized in that the filter is wound in a porous plug wrap having a hole ranging from 100 CU to 40,000 CU Rate, wherein the plug wrap paper optionally contains activated carbon.