EP2739781B1 - Cigarette paper with filler having specific particle size distribution - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a cigarette paper containing pulp fibers and filler particles. The term "contain" does not exclude that the cigarette paper contains other ingredients. In particular, it relates to a cigarette paper which makes it possible to reduce the amount of carbon monoxide in cigarette smoke and an associated cigarette.

BACKGROUND AND PRIOR ART

It is well known that cigarette smoke contains many harmful substances, including carbon monoxide. There is therefore a great interest in the industry to produce cigarettes whose smoke contains significantly less harmful substances. To reduce the amount of such substances, cigarettes are often equipped with filters, typically cellulose acetate. However, these filters are not suitable for reducing the content of carbon monoxide in the smoke of the cigarette, since cellulose acetate can not absorb the carbon monoxide. Various proposals to incorporate catalysts into the filter to convert carbon monoxide into the less harmful carbon dioxide have been unsuccessful, partly for functional reasons and partly for economic reasons.

It is also known to dilute the smoke produced in the cigarette, for example, by a stream of air flowing through a perforation of the tipping paper. As a result, although the content of carbon monoxide in the cigarette smoke can be reduced, but at the price that the substances determining the taste of the cigarette are diluted and thus the taste impression of the cigarette and the customer acceptance are deteriorated. The substances in the cigarette smoke are determined by a method in which the cigarettes are smoked to standardized specifications. Such a method is described for example in ISO 4387. The cigarette is first lit at the beginning of the first turn and then every minute a pull at the mouth end of the cigarette with a duration of 2 seconds and a volume of 35 cm ^{3 was} carried out on a sinusoidal draft profile on the cigarette. The moves are repeated until the cigarette falls below a certain, given in the standard length. The smoke flowing from the mouth end of the cigarette during traction is collected in a Cambridge Filter Pad and this filter is thereafter chemically analyzed for its content of various substances, such as nicotine. The gas phase flowing from the mouth end of the cigarette through the Cambridge Filter Pad during trains is collected and also chemically analyzed, for example to determine the level of carbon monoxide in the cigarette smoke.

During standardized smoking, the cigarette is therefore in two fluidically different states. During the draw, there is a significant pressure difference, typically in the range of 200 Pa to 1000 Pa, between the tobacco facing inside and the outside of the cigarette paper. By this pressure difference, air flows through the cigarette paper in the tobacco part of the cigarette and dilutes the resulting smoke during the move. During this phase, which lasts 2 seconds per puff, the extent of dilution of the cigarette smoke is determined by the air permeability of the paper. The air permeability is determined according to ISO 2965 and indicates which air volume per unit time, per unit area and per pressure difference flows through the cigarette paper and therefore has the unit cm ³ / (min cm ² kPa). It is often referred to as CORESTA unit (CU, CORESTA unit) (1 CU = 1 cm ³ / (min cm ² kPa)). With this value, the strand ventilation of a cigarette is controlled, ie the air flow, which flows in a train on the cigarette through the cigarette paper into the cigarette. Typically, the air permeability of cigarette papers is in the range of 0 CU to 200 CU, with the range of 20 CU to 120 CU being generally preferred.

In the period between trains, however, the cigarette will glow without any appreciable pressure difference between the interior of the tobacco part of the cigarette and the environment, so that the gas transport is determined by the gas concentration difference between the tobacco part and the environment. In this case, carbon monoxide can also diffuse through the cigarette paper from the tobacco part into the ambient air. In this phase, which lasts 58 seconds per train according to the procedure described in ISO 4387, the diffusion capacity of the cigarette paper is the relevant parameter for the reduction of carbon monoxide.

The diffusion capacity is a transfer coefficient and describes the permeability of the cigarette paper to a gas flow caused by a concentration difference. More specifically, the diffusion capacity refers to the gas volume passing through the paper per unit time, per unit area and per concentration difference, and therefore has the unit cm ³ / (s cm ² ) = cm / s. The diffusion capacity of a cigarette paper for CO ₂ can be determined, for example, with the CO ₂ Diffusivity Meter from Sodim and is closely related to the diffusion capacity of a cigarette paper for CO.

From the above considerations, it can be seen that the diffusion capacity of the cigarette paper has an independent, important importance for the carbon monoxide content in the cigarette smoke and that the values of carbon monoxide in the cigarette smoke can be reduced by increasing the diffusion capacity. This is particularly important in view of the self-extinguishing cigarettes known from the prior art, in which comparatively high levels of carbon monoxide are observed. In such cigarettes, fire retardant streaks are applied to the cigarette paper for self extinguishment in a standardized test (ISO 12863). This or a similar test, for example, is part of legal regulations in the US, Canada, Australia and the European Union. The increased levels of carbon monoxide are due to the fact that the carbon monoxide can diffuse from the cigarette only to a very small extent by the fire-retardant strip. It would therefore be of great advantage to have cigarette papers available that compensate for this undesirable side effect.

In practice, however, it is extremely difficult to adjust the diffusion capacity regardless of the air permeability of the paper in the papermaking process. However, air permeability is, in turn, in most cases the subject of the paper specifications given by the cigarette manufacturers, so that under this requirement the diffusion capacity is practically derived from the papermaking process and can be varied only in a very small range (cf. BE: The influence of the pore size distribution of cigarette paper on its diffusion constant and air permeability, SSPT17, 2005, CORESTA meeting, Stratford-upon-Avon, UK ). For both the air permeability and the diffusion capacity are determined by the pore structure of the cigarette paper, wherein there is a relationship between these quantities, which is approximately given by D * ~ Z ^(1/2) , where D * denotes the diffusion capacity and Z the air permeability. This relationship is especially true in a very good approximation, if the air permeability of the paper is adjusted primarily by the grinding of the pulp fibers.

Various approaches are known from the prior art in order to increase the diffusion constant of the cigarette paper, for example by adding thermally unstable substances (US Pat. WO 2012013334 ) or by choosing the average size of the filler particles ( EP 1450632 . EP 1809128 ). Despite such attempts, there is still a lack of opportunity to substantially increase the diffusion capacity at a given air permeability.

SUMMARY OF THE INVENTION

The present invention has for its object to provide a cigarette paper, which allows a selective reduction of the carbon monoxide content in cigarette smoke at a given air permeability.

This object is achieved by a cigarette paper according to claim 1. Advantageous developments are specified in the dependent claims.

According to the invention, the cigarette paper contains pulp fibers and filler, wherein at least 50 wt .-%, preferably at least 70 wt .-% and particularly preferably at least 90 wt .-% of the filler has a measured according to ISO 13320 with Mie correction for calcite particle size distribution, for the Distribution parameter p = d ₁₀ + 2 * d ₃₀ + 2-d ₇₀ -d ₉₀ applies: p ≤ 5.0 μm, preferably p ≤ 4.0 μm and particularly preferably p ≤ 3.5 μm, and p ≥ - 1, 0 μm, preferably p ≥ 0.0 μm and particularly preferably p ≥ 1.0 μm.

The particle size distribution characterizes the granulometric state of a particle collective and describes the probability distribution of the particle size in the particle collective. According to ISO 13320, the particle size is determined by the diffraction pattern of a laser beam. To calculate the particle size from the diffraction pattern, different models are used, for example according to Fraunhofer or Mie. For the here relevant particle sizes, the Mie model with material parameters for calcite is used. From the particle size distribution measured in this way it is possible, for example, to deduce which volume fraction of the particles is smaller than a predetermined size. Such proportions may be given, for example, in the form "d _x " where x is a number between 0 and 100 and d is a measure of particle size. For example, d ₁₀ = 0.5 μm means that ₁₀ % by volume of the particles in the collective are smaller than 0.5 μm.

The particle size "d" corresponds to the diameter of a spherical particle. For particles without spherical shape, it corresponds to the diameter possessed by a spherical particle, which, measured according to ISO 13320, gives the same result as the particle without spherical shape.

In this case, the particles, which are distributed according to the above-mentioned particle size distribution, for the most part be platelet-shaped or non-platelet-shaped and in particular consist of lime. In this case, a non-platelet-shaped particle is considered in which the length l and the width b are less than four times as large, preferably less than twice the thickness d, the length l, the width b and the thickness d each corresponding to the maximum dimensions in three mutually orthogonal directions in space. In the idealized idea of a nearly cuboid geometry, the length 1, the width b and the thickness d could correspond, for example, to the edge lengths of the cuboid, i. H. it is by no means necessary for the length 1 to correspond to the longest dimension of the particle, which in the case of an idealized cuboid would correspond to the spatial diagonal. In general, however, the length 1 will be greater than or equal to the width b and in turn differ by a factor of 2.5 or less from the longest spatial direction of the particle.

The inventors have found that by using fillers with a specific particle size distribution, the diffusion capacity of the cigarette paper can be influenced particularly favorably. In particular, a comparatively high diffusion capacity can be achieved for a given air permeability.

The shape of the particle size distribution is characterized by the four values d ₁₀ , d ₃₀ , d ₇₀ and d ₉₀ and from this a distribution parameter p is calculated by p = d ₁₀ + 2 * d ₃₀ + 2 * d ₇₀ -d ₉₀ . The inventors have found that when this distribution parameter p is about 5 μm in size falls short of an unexpected and sharp increase in the diffusion capacity of the cigarette paper. Further, the inventors have found that if the distribution parameter falls below a value of about 4 μm, a plateau is formed and no similar increase in the diffusion capacity can be expected, but the diffusion capacity remains at a high level. This connection is in Fig. 3 shown.

The distribution parameter p may also assume values less than 0 μm, and in general, one will choose the particle size distribution such that p is greater than -1 μm.

Preferably, the particle size distribution of the total filler in the paper is chosen such that the distribution parameter p assumes a value as defined above. However, it is within the scope of the invention also possible to combine a filler with the particle size distribution according to the invention with other fillers with other particle size distributions, as long as the proportion of the filler with a particle size distribution according to the invention is sufficiently high to provide the described technical effect. For this reason, the proportion of the filler with the particle size distribution according to the invention in the total filler content as mentioned above should be at least 50% by weight, preferably at least 70% by weight and in particular at least 90% by weight.

The filler is preferably precipitated lime. However, since the effect caused by the fillers in the paper is primarily physical in nature, similar benefits can be achieved with other fillers, for example, magnesium oxide, magnesium hydroxide, aluminum hydroxide, titanium dioxide, iron oxide, or combinations thereof.

auf eine erwartete Diffusionskapazität bei 50 CU normieren, indem man sie mit einem Faktor $\sqrt{50}/\sqrt{x}$

multipliziert, also $D_{50}^{*}=D_x^{*}\cdot \sqrt{50}/\sqrt{x}\mathrm{.}$

As mentioned above, the diffusion capacity D ^* in conventional papers is, to a good approximation, proportional to the root of the air permeability Z in CU, that is, D * ~ Z ^(1/2) . A typical value for the diffusion capacity for CO ₂ at an air permeability of Z = 50 CU is z. B. 1.65 cm / s. Until now, it has been technically extremely difficult to vary the diffusion capacity D ^* independently of the air permeability Z such that, given a given air permeability Z, an increased diffusion capacity D ^* results. By the invention However, using filler having a particle size distribution according to the invention, it is possible to raise the diffusion capacity D ^* for CO ₂ to D ^* ≥ 1.80 cm / s or more for an otherwise similar paper having an air permeability of Z = 50 CU. A similar relative increase in the diffusion capacity D ^* due to filler having such a particle size distribution also results at air permeabilities Z which deviate from Z = 50 CU. To quantify this effect also for general air permeabilities of x CU, the diffusion capacity D ^* for CO ₂ can be exploited using the relationship $D_x^{*}~{\mathrm{<figure-callout\; id="1"\; label="Z"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">Z</figure-callout>}}^{\left(1/2\right)}$

normalize to an expected diffusion capacity at 50 CU by factoring them $\sqrt{50}/\sqrt{x}$

multiplied, so ${\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}=D_x^{*}\cdot \sqrt{50}/\sqrt{x}\mathrm{,}$

für CO₂ eines Zigarettenpapiers mit einer Luftdurchlässigkeit von x CU daher: $D_x^{*}\cdot \sqrt{50}/\sqrt{x}\ge 1,80\mathrm{cm}/\mathrm{s},$

vorzugsweise ≥ 1,90 cm/s und insbesondere ≥ 2,0 cm/s. Dies gilt insbesondere für Luftdurchlässigkeitswerte x aus dem Bereich 20 ≤ x ≤ 120, vorzugsweise 30 ≤ x ≤ 100, und zumindest für Papiere mit Füllstoffgehalten zwischen 20 und 40 Gew.-%.In an advantageous embodiment of the invention applies to the diffusion capacity $D_x^{*}$

for CO _{2 of} a cigarette paper with an air permeability of x CU, therefore: $D_x^{*}\cdot \sqrt{50}/\sqrt{x}\ge 1.80\mathrm{cm}/\mathrm{s}.$

preferably ≥ 1.90 cm / s and in particular ≥ 2.0 cm / s. This applies in particular to air permeability values x from the range 20 ≦ x ≦ 120, preferably 30 ≦ x ≦ 100, and at least for papers with filler contents between 20 and 40 wt .-%.

It turns out that for the effect according to the invention, the total particle size distribution is significantly more critical than the mean particle size alone, ie the desired effect is achieved essentially independently of the mean particle size. In a preferred embodiment, the median value d _{50 of} the particle size distribution measured according to ISO 13320 with Mie correction for calcite is between 0.2 μm and 4.0 μm, preferably between 0.5 μm and 3.0 μm.

The filler according to the invention can be added to the paper in the usual way, as is known to the person skilled in the art in papermaking. Also, in the production of the paper requires no additional, special measures after the addition of the filler according to the invention.

Preferably, the total filler content of the paper between 10 wt .-% and 45 wt .-%, particularly preferably between 20 wt .-% and 40 wt .-%. Furthermore, that has Cigarette paper preferably has a basis weight of 10 g / m ² to 60 g / m ² , particularly preferably from 20 g / m ² to 35 g / m ² .

In a particularly preferred embodiment, the paper is treated in areas with fire retardant materials that are capable of imparting self extinguishing properties to a cigarette made from the paper. As previously mentioned, such fire retardant areas hinder the diffusion of CO out of the cigarette between two consecutive trains. This is the reason why such self-extinguishing cigarettes are typically observed to have elevated CO levels. This is a significant problem because the increased fire protection should not increase the health hazard of cigarette smoke. With the cigarette paper according to the invention, the typical increase in the CO content in cigarette smoke due to the fire-retardant regions can be at least partially compensated by the increased diffusion capacity of the paper in the untreated sections. Therefore, the invention in connection with such treated paper unfolds a special technical effect.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

shows a table in which the values for d ₁₀ , d ₃₀ , d ₇₀ , d ₉₀ , are given for eighteen different types of lime. Further, the table shows air permeability Z and diffusion capacity D * values for cigarette papers containing the respective lime in a low (18% by weight) and high (28% by weight) ratio, respectively.

Fig. 2

shows a table which, for the same types of lime and papers as in Table 1, the values $D_{}^{}$${}_{50}^{*}$

for low and high lime content and their difference $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

contains.

Fig. 3

shows a graphical representation of $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

depending on the distribution parameter p = d ₁₀ + 2 · d ₃₀ + 2 · d ₇₀ -d _{90 of} the particle size distribution for the papers and lime types of Fig. 1 ,

DESCRIPTION OF THE PREFERRED EMBODIMENTS AND COMPARATIVE EXAMPLES

To demonstrate the effect of the invention, paper sheets of pulp fibers filled with one of 18 different types of lime having different particle size distributions were tested. Two paper sheets were produced per type of lime, one with a lime content of about 18% by weight (lime content "low") and one with a lime content of about 28% by weight (lime content "high"). These percentages are always to be understood as weight percent relative to the mass of the paper sheet.

The particle size distribution of each type of lime was determined by means of laser diffraction according to ISO 13320. The measurement of all types of lime was carried out with a device from CILAS named CILAS 1064 (serial number 273) and the evaluation with the software "The Particle Expert" v 6.15. For the computer-aided evaluation, the Mie model for calcite was used. The measurement was carried out by means of a wet dispersion, in which the sample was dispersed in a liquid by means of the ultrasonic dispenser integrated in the measuring device. This ultrasonic dispenser was operated at a power of 50 watts and a frequency of 38 kHz. The liquid used was distilled water. In total, 500 ml of water were filled into the dispersion unit of the measuring instrument for each measurement. The amount of sample consisted of about 0.1 g of the material to be examined in the dry state. From each sample, 6 measurements were taken with a stability test of 15 measurements when a measurement was deviated. Measurements were taken in accordance with the operating instructions of the equipment used, and the standard setting of the instrument was chosen, unless otherwise stated, as well as ISO 13320. The evaluation of the particle size distribution by the instrument provides the sizes d ₁₀ , d ₃₀ , d ₇₀ and d ₉₀ , from which, according to p = d ₁₀ + 2 * d ₃₀ + 2 * d ₇₀ -d _90, the distribution parameter p was calculated.

For all paper sheets, the same pulp fiber mixture consisting of a mixture of short and long fibers was used to make the result dependent only on the particle size distribution of the lime and the lime content. Following the production of the paper sheets, the diffusion capacity and air permeability were measured. The Diffusion capacity D * of the papers was measured after conditioning according to ISO 187 with a Sodim Paper Diffusivity Meter, Type 95X-2 (Series 4 No. 26). The air permeability Z of the papers was determined according to ISO 2965, using a measuring head with a rectangular opening of 10 × 20 mm. A summary of the measurement data is shown in Table 1, which is in Fig. 1 is reproduced.

The aim of the invention is to influence the diffusion capacity as much as possible and the air permeability as little as possible, if one changes the filler content. Since the paper sheets all have a different air permeability, it is necessary to normalize the values on the paper with a uniform air permeability - here 50 CU - in the manner described above.

die Differenz der Diffusionskapazitäten $D_{50}^{*}$

bei hohem und niedrigem Kalkgehalt bei einem Papier mit 50 CU Luftdurchlässigkeit bezeichnet.The values in Table 2 which result in Fig. 2 is reproduced, wherein $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

the difference of the diffusion capacities $D_{}^{}$${}_{50}^{*}$

high and low lime content for a paper with 50 CU air permeability.

der Diffusionskapazität in einem Diagramm dar, wie es in Fig. 3 gezeigt ist, dann zeigt sich, dass eine besonders hohe Änderung der Diffusionskapazität erreicht werden kann, wenn der Verteilungsparameter p höchstens 5,0 µm, vorzugsweise höchstens 4,0 µm und besonders vorzugsweise höchstens 3,5 µm beträgt, gleichzeitig aber wenigstens -1,0 µm, vorzugsweise wenigstens 0,0 µm und besonders vorzugsweise wenigstens 1,0 µm beträgt.If one considers the relationship between the distribution parameter p of the particle size distribution of the filler and the change $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

the diffusion capacity in a diagram, as in Fig. 3 shown, it can be seen that a particularly high change in the diffusion capacity can be achieved if the distribution parameter p is not more than 5.0 μm, preferably not more than 4.0 μm and particularly preferably not more than 3.5 μm, but at least -1, 0 microns, preferably at least 0.0 microns and more preferably at least 1.0 microns.

Papers Nos. 10 and 12-18 thus belong to the embodiments according to the invention, while the other papers show that fillers with particle size distributions whose distribution parameter p is outside the value range according to the invention do not achieve the desired effect.

verhalten, sollte $\mathrm{\Delta }{D}_{50}^{*}=0$

sein, was bedeuten würde, dass die Diffusionskapazität D* praktisch nicht unabhängig von der Luftdurchlässigkeit eingestellt werden kann. Davon verschiedene Werte von $\mathrm{\Delta }{D}_{50}^{*}$

hingegen weisen auf Abweichungen von diesem starren Zusammenhang hin, die man sich im Rahmen der Erfindung zunutze macht. Diese größeren Werte von $\mathrm{\Delta }{D}_{50}^{*}$

erhält man, wie die Erfinder zeigen konnten, für Füllstoffe mit einer Partikelgrößenverteilung, deren Verteilungsparameter p zwischen 5,0 µm und -1,0 µm liegt, wobei bevorzugte Obergrenzen für den Verteilungsparameter p bei 4,0 µm, bevorzugt bei 3,5 µm liegen, und bevorzugte Untergrenzen bei 0,0 µm, bevorzugt bei 1,0 µm liegen.Assuming that the air permeability Z and the diffusion capacity D * are in good approximation according to $\mathrm{D}*~\sqrt{Z}$

behave, should $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}=0$

be, which would mean that the Diffusion capacity D * practically can not be set independently of the air permeability. Of which different values of $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

on the other hand, they indicate deviations from this rigid relationship, which are used in the context of the invention. These larger values of $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

one obtains, as the inventors could show, for fillers with a particle size distribution whose distribution parameter p is between 5.0 μm and -1.0 μm, preferred upper limits for the distribution parameter p being 4.0 μm, preferably 3.5 μm are, and preferred lower limits at 0.0 microns, preferably at 1.0 microns.

erhalten lässt, der größer als 1,80 cm/s, vorzugsweise größer als 1,90 cm/s und insbesondere größer als 2,0 cm/s ist.It is also evident from Table 2 that in the case of the papers according to the invention having such a filler particle size distribution with an air permeability Z = 50 CU, in fact a comparatively high absolute value for the diffusion capacity $\mathrm{\Delta }{\mathrm{<figure-callout\; id="50"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{50}^{*}$

greater than 1.80 cm / s, preferably greater than 1.90 cm / s and in particular greater than 2.0 cm / s.

Claims (9)

1. Cigarette paper which contains pulp fibres and filler material particles, wherein at least 50% by weight, preferably at least 70% by weight and in particular at least 90% by weight of the filler material has a particle size distribution, measured in accordance with ISO 13320 with Mie-correction for calcite, for which the distribution parameter p=d₁₀+2·d₃₀+2.d₇₀-d₉₀ holds:

   p≤5.0 µm, preferably p≤4.0 µm, and particularly preferably p≤3.5 µm, and

   p≥-1.0 µm, preferably p≥0.0 µm, and particularly preferably p≥1.0 µm.
2. Cigarette paper according to claim 1, in which the filler material consists entirely or partially of one or more of the following materials: precipitated chalk, magnesium oxide, magnesium hydroxide, aluminium hydroxide, titanium dioxide and iron oxide.
3. Cigarette paper according to claim 1 or 2, with an air permeability of x CU and a diffusion capacity $D_x^{*}$

   

   for CO₂, wherein $D_x^{*}\cdot \sqrt{50}/\sqrt{x}\ge 1,80\mathit{cm}/s,$

   

   preferably ≥1.90 cm/s and particularly preferably ≥2.0 cm/s.
4. Cigarette paper according to claim 3, wherein 20 ≤ x ≤ 120, preferably 30 ≤ x ≤ 100.
5. Cigarette paper according to one of the preceding claims, in which the median value d₅₀ of the particle size distribution measured in accordance with ISO 13320 with Mie-correction for calcite is between 0.2 µm and 4.0 µm, preferably between 0.5 µm and 3.0 µm.
6. Cigarette paper according to one of the preceding claims, in which the total filler material content of the paper is between 10% by weight and 45% by weight, preferably between 20% by weight and 40% by weight.
7. Cigarette paper according to one of the preceding claims, in which the basis weight is between 10 g/m² and 60 g/m², preferably between 20 g/m² and 35 g/m².
8. Cigarette paper according to one of the preceding claims, in which the paper is treated with burn-retardant materials in discrete areas which are suitable for providing a cigarette manufactured from the paper with self-extinguishing properties.
9. Cigarette comprising a tobacco rod and a cigarette paper wrapping the tobacco rod, wherein the cigarette paper is a cigarette paper according to one of claims 1 to 8.

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