EP3039186A1

EP3039186A1 - Efficiently producible cigarette paper for self-extinguishing cigarettes

Info

Publication number: EP3039186A1
Application number: EP14747961.2A
Authority: EP
Inventors: Dietmar Volgger; Roland Zitturi
Original assignee: Delfortgroup AG
Current assignee: Delfortgroup AG
Priority date: 2013-08-29
Filing date: 2014-08-07
Publication date: 2016-07-06
Anticipated expiration: 2034-08-07
Also published as: PH12016500362A1; MY177941A; US10231481B2; PL3039186T3; CN105518213A; KR102427680B1; CN105518213B; WO2015028276A1; BR112016003341A2; DE102013109386B3; ES2747802T3; TR201911238T4; EP3039186B1; US20160198761A1; BR112016003341B1; KR20160047478A

Abstract

The invention relates to cigarette paper, which has at least one treated partial region in which a composition is applied, which composition contains filling-material particles or a mixture of filling-material particles. The diffusion capacity is lower in the at least one treated partial region than in an untreated region of the cigarette paper, wherein at least 20 wt%, preferably at least 50 wt%, and especially preferably at least 70 wt% of the filling-material particles in the treated partial region are formed by a filling material having a plate-like shape or a filling material having a cubic shape. Additionally or alternatively, a filling material having a scalenohedral or rhombohedral crystal structure can also be used, provided that the particle size distribution is suitably selected.

Description

Efficiently produced cigarette paper for self-extinguishing cigarettes

FIELD OF THE INVENTION The present invention relates to a cigarette paper which imparts self-extinguishing properties to a cigarette made therefrom, wherein the required paper properties can be adjusted with little effort. More particularly, it relates to a cigarette paper which is partially treated with a composition which reduces the diffusion capacity of the cigarette paper and contains a filler having a specific crystal structure, particle shape or particle size, and a process for producing this paper and a cigarette made from this paper.

BACKGROUND AND PRIOR ART It is an aim of the tobacco industry to produce cigarettes which have less tendency to cause fires. Such cigarettes are already part of legal regulations in various countries and regions, such as the USA, Canada, the European Union or Australia. To determine if a cigarette has a lower propensity to cause fire, use one of the tests described in ISO 12863: 2010 or ASTM E2187.

In this case, a smoldering cigarette on a defined substrate, for example, 10 layers of the filter paper Whatman no. 2, and observe whether the cigarette extinguished by itself, before the entire visible tobacco rod is burned out. In many cases, the legal provisions require that of 40 tested cigarettes at least 30 have to extinguish themselves.

One way to achieve the self-extinction of a cigarette in this test is to apply a composition in portions to the cigarette paper which reduces the diffusion capacity of the cigarette paper. The workings of these subregions are based primarily on preventing the access of oxygen to the cigarette's glow cone and thus lead to self-extinction of the cigarette. Since the access of oxygen during glaring is determined primarily by the difference in concentration between the interior of the cigarette and the environment, that is to say by the diffusion, it is important to choose the diffusion capacity of these subregions to be sufficiently low.

The measurement of the diffusion capacity of such subregions can be carried out with a corresponding measuring instrument from Borgwaldt KC (Borgwaldt A50) according to the CORESTA Recommended Method no. 77 done. The diffusion capacity describes a gas transport through the cigarette paper driven by a concentration difference. It therefore designates the gas volume passing through the paper per unit time, per unit area and per concentration difference and thus has the unit cm ³ / (cm ² s) = cm / s.

The necessary for the self-extinction of the cigarette diffusion capacity of the applied to the cigarette paper sections depends not only on the properties of cigarettes paper but also to a considerable extent on the tobacco blend in the cigarette and the geometry of the cigarette. It is known, for example, that a high content of coarse tobacco particles, the so-called stems, in the tobacco mixture makes self-extinguishment less likely, while a high proportion of fine-cut or expanded tobacco promotes self-extinguishment. It is also known that cigarettes with a smaller diameter are generally easier to extinguish by themselves and a greater length of the tobacco rod is also beneficial for self-extinguishing, if only because, given the design of the portions, more of the portions of the tobacco rod treated with the composition will usually be more Cigarette are as with a short tobacco rod.

One could simply equip the treated sections of the cigarette paper with a very low diffusion capacity and thus cause the self-extinguishing largely independent of the tobacco mixture or the entire cigarette construction. However, this method has the disadvantage that the subregions not only hinder the diffusion of oxygen into the cigarette but also the diffusion of the carbon monoxide which is formed in the tobacco rod during smoldering and the drawing phase out of the cigarette. Therefore, it comes through the subareas to an increase in carbon monoxide in the smoke, which is undesirable because of the usual legal requirements for the maximum carbon monoxide content in the smoke. In addition, too low a diffusion capacity leads to a frequent self-extinguishment of the cigarette in the normal smoking process, which affects the acceptance of such cigarettes in the smoker.

From the prior art, it is known to perform the portions as bands in the transverse direction of the cigarette paper, so that they come to lie on a cigarette made of this paper in the circumferential direction. It is also known that in many cases a minimum width of the 4mm tapes is required to achieve self extinguishing at all. In practice, however, it usually turns out that to comply with the statutory provisions typically 6 mm wide, full-surface printed bands on the cigarette paper are necessary. The distance between the bands, however, usually results from the length of the tobacco rod of the cigarette, since it is often required by law that at least two bands must be on the tobacco rod. Other shapes of the portions, such as bands interrupted by a 1 mm wide slot, 6 or 7 mm wide bands are also known. In principle, however, the subareas can assume any desired form, as long as it is compatible with the compositional application method and sufficient self-extinguishment can be ensured.

Many compositions are known in the art, which can be applied in some areas on the paper. Often these are water-based compositions comprising at least one film-forming material. This film-forming material forms a superficial film upon drying of the paper after application, thus closing the pores of the paper and thus reducing the diffusion capacity. Other materials which instead penetrate into the pores of the paper are also known. In some cases, the composition also contains pigments. These pigments can impart a color to the subregions, but in many cases are white to match the opacity and whiteness of the treated subregions to those of the untreated paper, making them very less visible.

The application of the composition to the paper can be carried out according to the state of the art by all possible application methods, printing or spraying methods having proven themselves. The job can be done after the production of the untreated paper or during papermaking in the paper machine. The manufacturer of cigarette papers for self-extinguishing cigarettes is therefore required to provide a paper in which the diffusion capacity in the sub-areas is tailored to the entire cigarette construction that the legal requirements are being met, but the diffusion capacity is not unnecessarily low. Therefore, the cigarette paper manufacturer must be able to adjust the diffusion capacity of these subregions with as efficient a means as possible in the largest possible range so that even smaller quantities of such paper can be produced cost-efficiently. Because, without the requirement of self-extinguishing, a type of cigarette paper can in principle be used on many different cigarette constructions and can thus be produced in large batches, this requirement increases the number of different paper types and correspondingly reduces the size of a production batch.

The prior art allows several ways to adjust the diffusion capacity of the treated portions of the cigarette paper.

One possibility is to adjust the geometry of the treated sections. The smaller the treated area, the less likely it is to self-extinguish. However, changing the geometry of the treated areas is not very efficient because, for example, in printing processes such as gravure printing, it requires changing the printing cylinder, which takes some time and reduces productivity. In addition, a pressure cylinder and possibly also a reserve cylinder must be purchased and stored for each candidate geometry. The process is therefore relatively expensive for small production batches. Another possibility is to vary the amount of composition per unit area of treated sections applied to the cigarette paper. Again, this can be done with a printing process, such as gravure, with the help of the printing cylinder. The impression cylinder has a plurality of small engraved or etched depressions corresponding to the print pattern into which the composition is taken from a reservoir and transferred from these depressions to the paper. The volume or other properties of these wells can affect the amount applied. However, the disadvantages with respect to the pressure cylinder change and the storage of the printing cylinder are the same as in the adaptation of the geometry of the partial surfaces. Finally, another possibility is to change the proportion of the film-forming material in the composition. The less film-forming material in the composition, the less film-forming material is transferred to the paper with the same amount of composition applied. This method has the disadvantage that changing the proportion of the film-forming material in the composition also changes the viscosity of this composition. Most application methods do not allow a large variation in the viscosity of the composition to be applied or require corresponding adjustments of the process parameters such as speeds or drying temperatures, which is why this method can be used only within narrow limits. Although the viscosity can also be influenced by the choice of the film-forming material, but the legal requirements regarding the components of the cigarette paper as well as the influence on the taste of a cigarette made from such a paper very narrow limits.

Thus, what is sought is a way to easily and inexpensively adjust the diffusion capacity of the treated portions of the cigarette paper, so that comparatively small batches of cigarette paper, each with different diffusion capacity in the treated areas of the paper can be efficiently produced.

SUMMARY OF THE INVENTION

The present invention is therefore based on the object of providing a cigarette paper which has a defined diffusion capacity in treated partial regions and can be produced cost-effectively.

This object is achieved by a cigarette paper according to claim 1 and a manufacturing method according to claims 17 and 27. Such a cigarette paper may find application in a cigarette according to claim 33. Advantageous developments are specified in the dependent claims.

The cigarette paper according to the invention has treated subregions in which a composition is applied which contains filler particles or a mixture of filler particles, the diffusion capacity being lower in the treated subregions than in an untreated area of the cigarette paper. At least 20% by weight, preferably at least 50% by weight and particularly preferably at least 70% by weight of the filler particles in the treated subregions are formed by one or more of the following filler particle types:

(a) a filler having a platy shape,

(b) a filler having a scalenohedral crystal structure and having a particle size distribution for which:

p> 0.7, preferably p> 0.8, particularly preferably p> 0.85 and in particular p> 0.9, or

p <0.3, preferably p <0.25, and particularly preferably p <0.2,

(c) a filler having a rhombohedral crystal structure and having a particle size distribution for which:

> p> 0.5, preferably p> 0.6, and particularly preferably p> 0.7,

(d) a filler having a cubic shape or

(e) a filler having a scalenohedral crystal structure and having a particle size distribution for which:

p> 0.40, preferably p> 0.45 and

p <0.60, preferably p <0.55.

Here, p is a dimensionless parameter that is defined as d ₅ o (d ₉ o-dio) and represents an average particle size d ₅ o related to the distribution width dgo-dio.

All information on particle sizes refers to the particle size distribution determined according to ISO 13320: 2009 by means of laser diffraction and a model according to Mie. The thus determined particle size distribution can be seen, which volume fraction of the particles is smaller than a predetermined size. Such proportions are given in the present disclosure in the form "d _x , where x is a number between 0 and 100 and d is a measure of particle size. For example, dio = 0.5 μιη means that 10 vol .-% of the particles are smaller than 0.5 μιη. The particle size "d" corresponds to the diameter of a spherical shaped particle. In the case of particles without a spherical shape, it corresponds to the diameter possessed by a spherical particle which, measured according to ISO 13320: 2009, gives the same result as the particle without a spherical shape. According to the invention, the object is accordingly achieved by applying to the cigarette paper in subregions a composition containing filler particles or a mixture of filler particles, wherein a desired diffusion capacity of the subregions can be adjusted by the crystal structure, shape and size distribution of these filler particles.

As a starting point for the following considerations and explanations serves the diffusion capacity of the sub-areas of a cigarette paper, which is treated in these sub-areas with a composition containing as filler a geologically degraded lime with an average particle size of about 2.38 μιη. Such geologically degraded lime is an obvious choice and is considered in the following description of the invention as a "normal filler. Terms such as "high", "higher", "lower", "lower" or "middle" in terms of diffusion capacity are to be understood relative to this reference point.

The present invention is based on the recognition that the diffusion capacity in the treated areas - with otherwise the same composition and weight fraction - depending on the properties shape, crystal structure and particle size distribution of the filler can change, to an extent that allows it to adjust the diffusion capacity for a variety of base papers and cigarette configurations, respectively, to give the appropriate diffusion capacity. The "suitable diffusion capacity" is, for example, a diffusion capacity which leads to a reliable self-extinction in an ISO 12863: 2010 or ASTM E2187 test, but at the same time prevents the cigarette from automatically extinguishing during the normal smoking process of the filler according to one or more of the above three criteria is of particular technical importance because the other properties of the composition which have an influence on the processing process do not change, or at least do not change significantly, this would be different if, for example, the diffusion capacity exceeds adjusted the weight fraction of the filler because this would change the macroscopic physical properties of the composition, especially the viscosity, so that the entire processing process would be affected. In order to be able to tailor the diffusion capacity in the treated areas, it is important to identify those types of fillers that can increase or decrease the diffusion capacity over a composition having a "normal" filler, such as geologically degraded lime. The above-mentioned filler types (a) - (c) lead to an increase in the diffusion capacity, while the filler types (d) and (e) lead to a reduction of the diffusion capacity compared to a composition with conventional geologically degraded lime and are therefore well suited to the Adjust the diffusion capacity of the treated areas to the desired value.

Specifically, the inventors have found that the diffusion capacity of the portions of the cigarette paper can be increased under otherwise unchanged conditions when at least a part of the filler particles in the composition has a platy shape (see feature (a)).

The inventors have also found that the diffusion capacity of the portions of the cigarette paper can be reduced under otherwise unchanged conditions when at least a portion of the filler particles in the composition have a cubic shape (feature

Finally, the inventors have found that the diffusion capacity of the portions of the cigarette paper is otherwise in a middle range under otherwise unchanged conditions when at least a portion of the filler particles in the composition have a scalenohedral or rhombohedral crystal structure. However, with respect to scalenohedral and rhombohedral crystal structures, the inventors have found that the diffusion capacity can be adjusted depending on a simple particle size distribution parameter of this filler. Thus, fillers with a rhombohedral and scalenohedral crystal structure have the potential to have a diffusion capacity higher than that of an otherwise similar composition with geologically degraded lime Filler results to increase (features (b) and (c)) and - in the case of scalenohedral crystal structure - to reduce (feature (e)).

In the case of fillers with a scalenohedral crystal structure, the diffusion capacity can thus be adjusted on the basis of a dimensionless parameter p derived from the particle size distribution. It can be seen that the average particle size d ₅ o, which is related to the distribution width dgo-dio, is the parameter especially suitable for this. One finds a very good linear correlation of the diffusion capacity with the size px (pl) with a correlation coefficient of over 0.94. This means that for scalenohedral fillers for a low diffusion capacity, the parameter p is chosen to be at least 0.4, preferably at least 0.45 and at most 0.6, preferably at most 0.55. In order to obtain a high diffusion capacity, one will choose the parameter p either low, ie at least 0 and at most 0.3, preferably at most 0.25 and particularly preferably at most 0.2, or high, namely at least 0.7, preferably at least 0.8 and more preferably at least 0.85 and especially at least 0.9.

For fillers with a rhombohedral crystal structure, too, the dimensionless parameter derived from the particle size distribution can be determined adjust the diffusion capacity. One finds a very good linear correlation of the diffusion capacity with the size px (p-0.6) with a correlation coefficient of over 0.98. This means that in the case of rhombohedral fillers, for a comparatively low diffusion capacity, the parameter p is selected to be at least 0.1, preferably at least 0.2 and at most 0.5, preferably at most 0.4. In order to obtain a high diffusion capacity, one will select the parameter p high, ie at least 0.5, preferably at least 0.6 and more preferably at least 0.7. Whether a particularly low parameter p, as in the case of scalenohedral fillers, also leads to an increase in the diffusion capacity, can not be assessed from the available data, but the person skilled in the art will easily be able to determine this if suitable fillers are available.

Regardless of whether the shape of the filler particles is platelet-shaped, cubic or the crystal structure is scalenohedral or rhombohedral, the proportion of these filler particles in the total amount of filler particles in the composition should be at least 20% by weight, preferably at least 50% by weight and more preferably at least 70 wt .-% amount. The higher the content of the filler particles, the more manifest the effect on the diffusion capacity associated with their shape.

According to the invention are the particles, regardless of their shape have a mean size d ₅ o μιη of at least 0.1, preferably at least 0.3 and particularly preferably μιη μιη have at least 0.5. The average size d ₅ o should be at most 10 μιη, preferably at most 7 μιη and more preferably at most 5 μιη.

In particular, for platelet-shaped or cubic filler has a mean size d ₅ o of at least 0.5 μιη, preferably at least 1.0 μιη, and of at most 5 μιη and preferably of at most 3 μιη proven.

For platelet-shaped filler particles is an area for the distribution parameter of at least 0.5, preferably at least 0.6 to at most 1.0, preferably at most 0.9 well suited.

For cubic filler particles is an area for the distribution parameter

of at least 0.2, preferably at least 0.3 to at most 0.7, preferably at most 0.6 well suited.

In a preferred embodiment, the platelet-shaped filler particles have a length 1, a width b and a thickness d, which correspond to the respective maximum dimensions in three mutually orthogonal spatial directions, both the length 1 and the width b at least twice as large, preferably at least four times are as big as the thickness d.

The length 1 and the width b will usually be different from each other, but should differ by a factor of less than 5, preferably less than 3 and more preferably less than 2.

In the idealized idea of a nearly parallelepiped-shaped geometry, the length 1, the width b and the thickness d could, for example, correspond to the edge lengths of the cuboid, ie it is by no means necessary that the length 1 correspond to the longest dimension of the particle which, in the case of an idealized cuboid, corresponds to the cuboid Room diagonal would correspond. Usually 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.

For the sake of illustration, reference is made to the appended FIG. 3, which illustrates a platelet-shaped filler particle in which the length 1, width b and thickness d are shown.

While there are no particular limitations except for the crystal structure, shape, size, and size distribution of the filler particles, they are preferably white so that the treated portions of the cigarette paper visually differ as little as possible from untreated areas of the same cigarette paper.

The filler particles may be metal salts, metal oxides or metal hydroxides, such as, for example, preferably calcium carbonate, titanium dioxide, magnesium oxide, magnesium hydroxide or aluminum hydroxide. Iron oxides can be used, but are not preferred because they are generally not white but often red, brown, yellow or black. However, they can be chosen favorably for colored cigarette papers.

A preferred filler is calcium carbonate and particularly precipitated calcium carbonate, because it is purer than geologically degraded, and thus the purity requirements of cigarette paper are easier to meet. Among the mineral forms of the calcium carbonate of the invention, such as calcite, aragonite and vaterite, with which the invention can be realized in principle, calcite is preferred because of its ready availability.

The proportion of the filler of the invention in the composition may vary. In compositions according to the invention which reduce the diffusion capacity of the cigarette paper, the filler should contain at least 1% by weight, preferably at least 3% by weight and at most 20% by weight, preferably at most 10% by weight. In any event, since the filler particles in the composition, regardless of their shape, increase the diffusion capacity with increasing proportion, the content of the filler in the composition is determined primarily by how much the other constituents of the composition are capable of reducing the diffusion capacity. It is possible, but not according to the invention, to change the diffusion capacity by changing the amount of filler in the composition. However, this also affects the viscosity of the composition, which may require additional adjustments in the application process, for example at speed. temperatures or drying temperatures. In contrast, according to the invention, the content of the filler in the composition should remain constant and the diffusion capacity should be adjusted only by changing the shape, crystal structure and size of the filler particles. The composition itself first comprises a solvent, but the term "solvent" is not intended to mean that it is a solution in the narrower chemical sense. In most cases, the fluoride particles will be suspended in the solvent but will not be dissolved. Water is a particularly preferred solvent because it is toxicologically safe and does not interfere with the smell and taste of the paper. For reasons of taste and to avoid contamination, drinking water quality water is particularly preferred. The use of distilled or de-ionised water is possible, but brings no additional benefits. Other solvents, such as ethanol or ethyl acetate, although not preferred, have at least the advantages over water of allowing them to evaporate on drying with lower temperatures and less energy and not causing wrinkles by swelling the fibers in the paper. Mixtures of solvents can also be used.

In addition to the solvent and the filler, the composition also comprises at least one material which is capable of reducing its diffusion capacity when applied to cigarette paper. Such a material is preferably film-forming. Particularly preferred are film-forming materials selected from a group consisting of starch, starch derivatives, cellulose, cellulose derivatives, dextrins, guar or gum arabic and alginates, or mixtures thereof. Very particular preference is given to oxidized starches and sodium alginate.

The proportion of the diffusion capacity reducing material in the composition can vary widely and is determined primarily by how much the material is capable of reducing the diffusion capacity and the viscosity of the composition for the application process. In general, the material which reduces the diffusion capacity will be present in the composition in a proportion of at least 0.1% by weight, preferably at least 1% by weight and more preferably at least 3% by weight. The material should be at most 40% by weight, preferably at most 30% by weight and more preferably at most 25% by weight of the composition. Again, it is not within the meaning of the invention, the diffusion capacity on the change of Content or the nature of the diffusion capacity reducing material in the composition to control, but the content and the material should remain unchanged and only the nature of the filler can be varied so that the viscosity and other process parameters do not change as possible.

Other materials in the composition may also be included to control certain properties of the composition or paper. These include materials for adjusting the viscosity, for adjusting the color, or else substances such as citrates, acetates and phosphates or other burn salts which control the glowing speed of the cigarette paper. The person skilled in the art is able to determine the proportion of these materials in the composition in accordance with the technical requirements for the paper or the application method.

For the application in a printing process, in particular in intaglio or flexographic printing, has a composition with a flow time of at least 10 s, preferably at least 12 s and at most 35 s, preferably at most 25 s, measured with a flow cup with 4 mm opening according to ÖNORM EN ISO 2431: 2011 at a temperature of the composition of 60 ° C, proven. Preferably, the amount of material applied in the subregions of the cigarette paper, expressed as mass per application surface in the dried state, is at least 0.5 g / m ² , preferably at least 1 g / m ² and / or at most 12 g / m ² , preferably at most 8 g / m ² . With such order quantities, the desired diffusion capacity can be achieved in an advantageous manner.

To estimate the diffusion capacity of the cigarette paper on the cigarette during smoking, the cigarette paper can also be heated before the measurement. The cigarette paper is stored in a preheated to 230 ° C oven for 30 minutes under air atmosphere, then removed from the oven and conditioned according to ISO 187: 1990. The measurement of the diffusion capacity is carried out according to CORESTA Recommended Method No. 77 with a Borgwaldt A50 meter from Borgwaldt KC.

Due to the thermal decomposition of the cigarette paper, the diffusion capacity increases, inter alia, depending on the paper properties and the nature of the diffusion capacity. reducing material in the composition. After this thermal treatment, the diffusion capacity of the treated portions is at least 0.05 cm / s, preferably at least 0.1 cm / s and at most 2 cm / s, preferably at most 1 cm / s. The diffusion capacity can vary from subarea to subarea, and it is also possible to change the diffusion capacity within a subarea in order, for example, to favorably influence the carbon monoxide content in the smoke, as long as the legally required self extinguishing according to ISO 12863: 2010 is not jeopardized.

The order of the composition can be carried out by all known from the prior art method, in particular by printing or spraying. For example, gravure or flexographic printing are particularly well suited.

The job is usually done on the screen side of the cigarette paper, as it faces the tobacco, and the sub-areas are less visible to the smoker with normal use of the cigarette. Applying to the top is also possible because this side of the paper is better suited for printing.

The application can be done in one or more layers with or without drying of the paper between the application procedures, whereby due to the necessary registration, i. Positioning, the individual layers to each other an order in as few layers, especially in only one layer is preferred. In the case where multiple layers are applied, it is not necessary that all layers be identical in shape and amount applied, and even in composition. Here is a wide field for fine adjustment of the paper properties, in particular the diffusion capacity, which is already known in part from the prior art, but usually accessible to the skilled worker by simple experimentation. The principle of the subject invention remains applicable.

The application of waterborne compositions may be associated with the formation of wrinkles on the paper which may be remedied by further treatment such as post-wetting of the paper followed by drying under mechanical tension. Also, substances for reducing wrinkling, such as propylene glycol or glycerin, may be included in the composition. The invention is easily combinable with many further treatment steps of the cigarette paper, as the person skilled in the art can easily determine experimentally. These include, for example, embossing, imprinting patterns to improve the appearance or coating with substances for influencing the composition of the smoke of a cigarette made from this paper, in particular the substances known as "Hoffmann analytes" in the smoke. These steps may be performed on the paper before or after the application of the composition, as required.

The processability of the cigarette paper according to the invention on the commercially available cigarette machines is unchanged.

There are no special requirements for the cigarette paper. In principle, all cigarette papers known from the prior art can be used according to the invention. This includes both cigarette papers for machine-made as well as manually or partially manually manufactured cigarettes.

The cigarette paper preferably has a basis weight of 9 g / m ² up to 70 g / m ² , preferably between 20 g / m ² and 50 g / m ² and preferably consists of pulp fibers, for example wood pulp fibers or pulp fibers from annual plants such as hemp, flax or esparto. The cigarette paper also preferably contains fillers, typically in a range of from 0% to 50%, preferably from 10% to 45%, by weight of the pulp, such as lime, kaolin, titanium dioxide, aluminum hydroxide, Magnesium oxide, magnesium hydroxide or, more rarely, iron oxides. Precipitated lime is preferred. In addition, the cigarette paper may also contain salts, for example to control the rate of glowing or other paper properties, including, for example, citrates, acetates or phosphates, malaria, tartrates, nitrates, succinates, fumarates, gluconates, glycolates, lactates, oxylates , Salicylates, α-hydroxycaprylates, bicarbonates, carbonates such as tri-sodium citrate, tri-potassium citrate or monoammonium phosphate. They are preferably contained in the range from 0% to 7% by weight of the pulp and are typically applied to the paper from an aqueous solution in the size press or film press of the paper machine or a separate device. Other substances, such as dyes, may be added to the cigarette paper as long as they are legally permitted and toxicologically safe. In an advantageous embodiment, the method for producing the cigarette paper comprises the following steps:

Preparing a first amount of a preliminary composition containing a solvent and a material capable of reducing the diffusion capacity of the cigarette paper;

Diverting a first portion of the preliminary composition,

Adding filler containing at least one or more of the above types of fillers (a) - (e) to the branched first portion of the preliminary composition to form a first composition, and

- Treating portions of the base cigarette paper with the first composition.

Thus, according to this embodiment, the composition does not become in a process as a whole, i. H. including the filler, formed. Instead, at first only a preliminary composition is prepared which contains a solvent and a material capable of reducing the diffusion capacity of the cigarette paper but not yet the filler, at least not yet in the final amount. From this preliminary composition is then branched a portion to which a filler or mixture of fillers is added to form a first composition while initially retaining a (possibly large) portion of the preliminary composition. With this first composition, a comparatively small amount of base cigarette paper can then be treated, and it can be checked whether the diffusion capacity in the treated areas is reduced to the desired extent. In this way, the preliminary composition in larger quantities and thus can be produced economically, while initially only a part of it is added to a first composition. If the first composition turns out to give the desired reduction in diffusion capacity in the treated areas, another part or all of the rest of the preliminary composition may also be supplemented with the same choice of filler or fillers.

However, if the diffusion capacity in the treated areas does not yet result in the desired diffusion capacity, the process can be continued as follows:

Diverting a second portion of the preliminary composition, - Adding fillers containing at least one of the above-mentioned filler types (a) - (e) to the branched second portion of the preliminary composition to form a second composition, wherein the selection of the filler particles added in kind or proportion of that of first composition differs, and

Treating portions of a base cigarette paper with the second composition.

In this way, the determination of the filler or a suitable mixture of filler species, which leads to the desired diffusion capacity in the treated areas, can be carried out in a simple and economical manner. This will be explained below with reference to several embodiments.

In an advantageous development, the addition of the fillers to the respective branched portion of the preliminary composition in the applicator or in a supply line to the applicator for applying the first and second composition is made. In this case, the admixture of the filler can thus be varied "on-line" during the application process, so that a suitable filler or a suitable filler mixture can be determined in a simple manner and with a comparatively small amount of rejects.It should also be noted that the continuous supply of a preliminary composition for transfer with fillers is meant as a "diversion" of a portion of the preliminary composition, because always only a portion of the preliminary composition is filled with fillers and the possibility exists that different proportions of the preliminary composition are mixed with different fillers.

In an advantageous development, the method for producing a cigarette paper comprises the following steps:

A providing a base paper,

B treating selected areas of the base paper with a composition to reduce the diffusion capacity of the base paper in the treated areas, the composition containing at least a first filler,

C at least approximately measuring the diffusion capacity in a treated area, D determining whether the measured diffusion capacity deviates from a So 11 value, E in the event that a deviation between the measured diffusion capacity and the set point exceeds a predetermined threshold, providing a modified composition which is at least in the composition of step B therein distinguishes that at least a portion of the first filler is replaced by a second filler that differs from the first filler by one of the shape, crystal structure, and particle size distribution characteristics to reduce the deviation of the diffusion capacity from the target value.

The steps B-E are preferably repeated until the deviation between the measured diffusion capacity and the setpoint value falls below a limit value. If this procedure is carried out automatically, it can be realized by a control process. However, the method may also be performed "manually" or semi-automatically, for example, in step E, a person decides which filler to use as the "second filler to account for at least a portion of the" first filler based on the deviation between the measured diffusion capacity and the set point " to replace.

The at least approximately measurement of the diffusion capacity preferably takes place by measuring transmission, absorption and / or reflection of electromagnetic radiation. In this way, although the diffusion capacity can not be determined as accurately as by the methods described above, this has the advantage that the diffusion capacity can be determined "on-line", that is, during the treatment process.

In the event that the diffusion capacity measured in step D is below the target value, it is advisable that the second filler is formed at least partially by one or more of the above-mentioned filler particle types (a) - (c). Should the diffusion capacity measured in step D be above the setpoint, the second filler may be formed, at least in part, by one or both of the above filler particle types (d) and (e). However, the method is not limited to this. Instead, it can also use other types of filler particles that have the desired effect on the diffusion capacity.

In an advantageous development, the composition contains two types of filler, which differ with respect to one of the characteristics shape, crystal structure and particle size distribution and of which one filler - at the same weight fraction and otherwise same composition - leads to a higher diffusion capacity in the treated area than the other. In this case, in step E, the proportionate ratio of the two fillers in the composition to the composition of step B is changed to reduce the deviation of the diffusion capacity from the target value. Such a method is relatively simple, but allows a suitable choice of the two types of filler nevertheless a relatively large variation of the achievable diffusion capacity.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the relationship between the dimensionless distribution parameter p of the particle size distribution and the diffusion capacity for scaleneohedral fillers.

FIG. 2 shows the relationship between the dimensionless distribution parameter p of the particle size distribution and the diffusion capacity for rhombohedral fillers.

Fig. 3 is a schematic representation of a platelet-shaped filler particle, in which the length 1, the width b and the thickness d are drawn.

4 shows a table with diffusion capacities and viscosity values for different filler types when using a first base paper A.

Fig. 5 shows a table with diffusion capacities for different filler types using a second base paper B.

EMBODIMENTS

For a better understanding of the present invention, it is illustrated below by some examples.

The composition applied to the paper is an aqueous composition consisting of 13% by weight of oxidized starch, 0.5% by weight of cationic starch and 6% by weight of lime as filler. The composition was prepared according to the instructions of the manufacturer of diert starch produced. A total of 13 different fillers were selected according to FIG. 4 and in each case one of the fillers was suspended in the composition.

The flow time of the composition as a measure of the viscosity was determined using an outlet cup with an opening of 4 mm in accordance with ÖNORM EN ISO 2431: 2011 at a temperature of the composition of 60 ° C. and is shown in FIG. 4.

The composition was applied to two different cigarette papers A and B. Before applying the composition, the cigarette paper A had a weight per unit area of 25 g / m ² , an air permeability according to ISO 2965 of 70 cm.min '. KPa ¹ , a filler content of 33% by weight, and a content of 1% by weight. Tripotassium citrate as fire salt, while cigarette paper B has a basis weight of 24 g / m ² , an air permeability according to ISO 2965 of 75 cm.min ^. KPa ^-1 , a filler content of 29% by weight, and a content of 2% by weight. To simulate the thermal decomposition of the cigarette paper during smoking, the cigarette paper was stored in a heated oven at 230 ° C for 30 minutes under an air atmosphere, then removed from the oven and conditioned according to ISO 187: 1990 Diffusion capacity was then carried out according to CORESTA Recommended Method No. 77 using a Borgwaldt A50 measuring instrument from Borgwaldt KC.

Without application of the composition after the above heating process, both cigarette papers had an average diffusion capacity of 2.17 cm / s calculated from 10 individual values.

The order of the composition was carried out by means of a gravure printing unit according to the prior art in a layer on the screen side of the original, so not heated, cigarette paper, in the form of 6 mm wide oriented in the transverse direction of the paper bands with a distance of tape center to center of 27 mm , After the job, the paper was dried.

As previously described for the measurement of the diffusion capacity of the cigarette paper without application of the composition, the now provided with the composition paper was stored in a preheated to 230 ° C oven for 30 minutes under air atmosphere, then removed from the oven and according to ISO 187: 1990 conditioned. The measurement of the diffusion capacity was then carried out according to CORESTA Recommended Method no. 77 with a Borgwaldt A50 meter from Borgwaldt KC at 10 different places. The mean values of the diffusion capacities are given in Tables 1 and 2 of FIGS. 4 and 5.

The ratio of the mean values of the diffusion capacities of the untreated cigarette paper and the treated areas is shown for Paper A in Table 1 of Fig. 4 and for Paper B in Table 2 of Fig. 5 in the column "Ratio", respectively.

The geologically degraded and ground lime from Examples 8 and 23 serves as a reference point.

It can be seen first of examples 1 and 15 that with platelet-shaped calcite an exceptionally high diffusion capacity can be achieved. The use of such filler causes a decrease in the diffusion capacity over that of the untreated cigarette paper by a factor between 2 and 4. Conversely, with cubic calcite, Examples 13 and 25, a very low diffusion capacity and, correspondingly, a decrease in diffusion capacity over that of the untreated cigarette paper are achieved a factor of 5 to 8

The scalenohedral and rhombohedral calcites of the remaining examples mostly provide diffusion capacities in the middle range.

In FIG. 1, the values of the distribution parameter p and the diffusion capacities for papers to which a composition having a scalenohedral filler has been applied are shown graphically, that is, for Examples 3, 4, 6, 9-11, 16-18, 21, 22 and 24 as a round point, as well as for Examples 12 and 26, in which the filler in addition to calcite also contains aragonite, as a small square. It can be clearly seen that both at low values for p, for example p <0.3, and at high values of p, for example p> 0.7, a high diffusion capacity can be achieved. In these ranges for the parameter p, the diffusion capacity is reduced by a factor of 3 to 6 compared with the untreated cigarette paper. For values of p between 0.3 and 0.7, there are low diffusion capacities and, correspondingly, a decrease in the diffusion capacity by a factor greater than 6. The line in FIG. 1 shows the curve px (pl) + 0.6 in cm / s and illustrates the good correlation of this size with the diffusion capacity. The correlation coefficient is more than 0.94. Examples 12 and 26 show a mixture of calcite and aragonite, with a primarily scalenoedric crystal structure. The data is shown as a small square in Figure 1 and fits well into the image for scalenohedral fillers. In FIG. 2, the values of the distribution parameter p and the diffusion capacities for papers to which a composition with a rhombohedral filler has been applied are shown graphically, that is to say for Examples 2, 5, 7, 14, 19 and 20. It can be clearly seen that FIG At low value for p, for example p <0.5, a low diffusion capacity can be achieved and thus a decrease in the diffusion capacity compared to the untreated cigarette paper by a factor of more than about 5, while for values of p> 0.5 it is high Diffusion capacities, that is, a decrease by a factor of less than about 5. The line in Figure 2 shows the curve 3px (p-0.6) +0.7 in cm / s and illustrates the good correlation of this size with the diffusion capacity. The correlation coefficient is more than 0.98. Whether for particularly low values of the distribution parameter p an increase of the diffusion capacity results for rhombohedral fillers can not be reliably determined from the data. However, one skilled in the art will be able to determine this by simple experimentation.

The rows in Tables 1 and 2 of Figs. 4 and 5 are sorted in descending order according to the measured diffusion capacity. It can also be seen by comparing the first and second column of FIG. 5 that the order of the lime varieties remains approximately the same. Since the examples of Tables 1 and 2 of FIGS. 4 and 5 differ only with regard to the cigarette paper, it can be seen that the invention can be used largely independently of the cigarette paper.

Also to be noted is the flow time of the composition as indicated in Table 1 of FIG. 4. The flow time is a measure of viscosity and, in all of the examples, is in the relatively narrow interval of 14.3 s to 16.5 s, so all the compositions can be processed similarly without further changes in process parameters. Thus, the advantage of a rapid adjustment of the diffusion capacity for small production batches and, depending on the method, without significant delay in the conversion of the diffusion capacity can be realized.

A particular advantage of the invention, as explained at the outset, is that without modification of the process parameters or the chemical constituents of the composition to be applied. Settlement, simply by choosing a suitable crystal structure, shape or size of the filler particles, the diffusion capacity can be influenced.

The invention can therefore be implemented particularly advantageously in the following method.

First, a cigarette paper is provided to which the composition is to be applied in some areas.

In a next step, a preliminary composition is prepared, comprising at least the solvent and a material for reducing the diffusion capacity, but at most insignificant amounts of the fillers according to the invention. This can preferably be done in a storage container.

In the case of a starch or starch derivative, this step may comprise suspending the starch or starch derivative in water, heating the suspension, lingering at an elevated temperature, and cooling. All of these steps can be done with concomitant stirring of this preliminary composition.

In general, one can proceed to the production of the preliminary composition according to the guidelines of the manufacturer of the diffusion capacity reducing material.

The next step is to select the type of filler particles based on the diffusion capacity of the treated portions on the cigarette paper.

Here, too, the starting point for the following considerations is the diffusion capacity of the subregions of a cigarette paper which is treated in these subregions with a composition containing as filler a geologically degraded lime having an average particle size of about 2.38 μm. Terms such as "high", "higher", "lower", "lower" or "middle" in terms of diffusion capacity are to be understood relative to this reference point. In order to achieve a high diffusion capacity, for example, a platelet-shaped filler is selected. The distribution parameter should be preferred here at least 0.5, preferably at least 0.6 and at most 1.0, preferably at most 0.9. In order to achieve a low diffusion capacity, it is preferable to choose a cubic filler. The distribution parameter should be preferred here at least 0.2, preferably at least 0.3 and at most 0.7, preferably at most 0.6.

In order to more accurately adjust the diffusion capacity in a central region, it is preferable to use a scalenohedral crystal structure filler whose distribution parameter leads to the desired diffusion capacity. For high diffusion capacities in the central region, a filler having a value of p greater than 0 and less than or equal to 0.3, preferably less than or equal to 0.25 and particularly preferably less than or equal to 0.2, or alternatively a filler having a value of p> 0.7, preferably> 0.8, particularly preferably> 0.85 and in particular> 0.9 choose. In this case, however, p should be <1.2, preferably <1.0. For low diffusion capacitances in the middle range, one will choose the distribution parameter p of the scalenohedral filler> 0.3, preferably> 0.4 and <0.7, preferably <0.6. The range of 0.45 <p <0.55 is particularly suitable for reducing the diffusion capacity.

Alternatively, in order to more accurately adjust the mid-range diffusion capacity, a rhombohedral crystal structure filler may also be used, with respect to its distribution parameter leads to the desired diffusion capacity. For high diffusion capacities in the middle range, a filler having a value of p> 0.5, preferably> 0.6 and more preferably p> 0.7, and preferably less than 1.0, will preferably be less than 0.8. For low diffusion capacities in the middle range, one will choose the distribution parameter p of the rhombohedral filler> 0.1, preferably> 0.2 and <0.5, preferably <0.4. With regard to the nature of the fillers, the orientation is advantageously based on the information given above. Preference is given to precipitated calcium carbonate and particularly preferably calcite.

The next step is to disperse the filler in the preliminary composition. It is essential for the invention that the filler is not as common is added to the entire provisional composition prepared in the first step, but only part of it. The amount of filler added to this portion of the preliminary composition will be consistent with the desired concentration of filler in the final composition. This allows the production of smaller quantities of the finished composition so that smaller batches of the paper can be made. In addition, it allows the rapid and easy change of the diffusion capacity by changing the filler without having to recreate the preliminary composition. The dispersion of the filler in a portion of the preliminary composition can be accomplished in a variety of ways.

For example, it is conceivable first to transfer part of the preliminary composition, for example by pumping, into another container and to add there the appropriate amount of the filler and to disperse it, for example by stirring.

Alternatively and preferably, it is also possible to disperse the filler first in a solvent, for example by stirring, preferably using the same solvent as for the preliminary composition, and then adding the filler suspension to the preliminary composition while transferring the latter to the applicator. This is preferred because fillers are often already prepared as an aqueous suspension ("slur- ry") and not as a dry powder or are commercially available.

The preliminary composition may for example be pumped from the storage tank in a pipe to the applicator and the filler suspension is, preferably by pumping, introduced into the same pipeline in the required amount. Very particularly preferred is a method in which the flow in the pipeline is turbulent and thus the mixing of the filler suspension takes place as quickly as possible with the preliminary composition. The method can be used particularly advantageously if the dead volume of the lines, containers and devices is as small as possible until the composition is applied to the paper. This will be the case, for example, when applied by spraying. In this way, a change in the type of filler in a very short time on the diffusion capacity of the treated portions on the cigarette paper impact, for example, without stopping the applicator. In the following step, the finished composition of the applicator is then fed and applied to the paper in partial areas. For this, the usual methods, such as printing methods, in particular gravure printing and flexographic printing, or spraying methods are available. After that, the paper is dried.

To remedy wrinkles, as they occur when applying aqueous compositions, can be used recourse to the method described above. In a further development of the inventive method, it is additionally possible to regulate the diffusion capacity of the treated subareas by automatically adapting the mixing ratio of two or more different types of fillers.

First, the diffusion capacity of the portions of the cigarette paper is measured. This can be done by sampling, off-line, on a separate meter, such as a Borgwaldt KC (Borgwaldt A50) instrument according to CORESTA Recommended Method no. 77 happen, or in the current order device, so on-line. Since a direct measurement of the diffusion capacity on-line is difficult, it can be estimated from other quantities such as transmission, absorption or reflection of electromagnetic radiation. Such an estimate may be made by image-analytical means, for example, the transparency of the electromagnetic-wave paper having a wavelength of at least 100 nm and at most 500 nm. This can be done by comparing the intensity of a reference beam of these electromagnetic waves, which does not pass through the paper, with the intensity of a beam passing through the paper. The higher the diffusion capacity and thus the pore volume in the paper, the lower will be the attenuation of the beam compared to the reference beam. This comparison of the intensities must be synchronized with the presence of treated portions in the range of the sensor. The obtained measured value is then compared with the desired value and the difference is transferred to an adjusting device which changes the proportions of the fillers fed to the preliminary composition. For example, if one measures too low a diffusion capacity and wishes to increase the diffusion capacity, one will reduce the amount of cubic calcite and increase that of platy calcite. If the difference is too high Fusion capacity will be reversed accordingly. This can be done, for example, by adjusting the flow rates by means of a flow regulator. Preferably, the adjustment of the proportions is done so that the total amount of filler in the composition does not change.

Of course, this process can of course also be carried out with a mixture of two or more fillers of a different shape or crystal structure, for example cubic and scalene-oedric, or platelet-shaped and rhombohedral, or cubic, scalenohedral and platelet-shaped or cubic, rhombohedral and platelet-shaped.

Finally, in one embodiment of the invention, one can also use two scalenohedral fillers which, with respect to the value px (pl), use the distribution parameter sufficiently different. Preference is given to choosing a filler having a value of p greater than 0 and <0.3, preferably <0.2, and with a filler having a value of p> 0.3, preferably> 0.4 and <0.7 <0.6, combine. Alternatively, one may also choose a filler having a value of p> 0.7, preferably> 0.8 and <1.2, preferably <1.0, and with a filler having a value of p> 0.3, preferably> 0, 4 and <0.7, preferably <0.6, combine. Similarly, in one embodiment of the invention, two rhombohedral fillers may also be used which, in terms of the value px (p-.6), have the distribution parameter sufficiently different. Preference is given to choosing a filler having a value of p> 0.1, preferably> 0.2 and <0.5, preferably <0.4 and with a filler having a value of p> 0.5, preferably> 0.6 and <1.0, preferably <0.8.

In the case of platelet-shaped filler particles, preference is given to a filler having a distribution parameter of at least 0.5, preferably at least 0.6 to at most 1.0, preferably at most 0.9 choose. For cubic filler particles, it is preferable to use a filler having a distribution parameter of at least 0.2, preferably at least 0.3 to at most 0.7, preferably at most 0.6 choose. The principle is always, regardless of shape, crystal structure and particle size distribution, to combine two or more fillers which give substantially different diffusion capacities in the partial areas on the cigarette paper. It is also possible to mix two or more fillers of the same shape but different particle size distribution or even different chemical compounds according to this control method. However, the mixture of two fillers is preferred because the control method can then be designed simply. The use of said mixtures is of course possible without this rule.

The inventive and preferred distribution parameter intervals generally apply to the use of filler particles having the particular shape or crystal structure, regardless of whether the filler is used alone or in a mixture of two or more fillers.

From the cigarette papers according to the invention, cigarettes can be produced manually, manually or partially manually according to the methods of the prior art.

Claims

claims

1. cigarette paper having at least one treated portion in which is applied a composition containing filler particles or a mixture of filler particles,

wherein the diffusion capacity in the at least one treated partial area is lower than in an untreated area of the cigarette paper,

wherein at least 20% by weight, preferably at least 50% by weight and particularly preferably at least 70% by weight of the filler particles in the treated portion are formed by one or more of the following types of filler particles:

(a) a filler having a platy shape,

p <0.3, preferably p <0.25, and particularly preferably p <0.2,

p> 0.5, preferably p> 0.6, and particularly preferably p> 0.7,

(d) a filler having a cubic shape or

p> 0.40, preferably p> 0.45 and

p <0.60, preferably p <0.55, where: p = d ₅ o / (d ₉ o -dio).

2. The cigarette paper according to claim 1, wherein the filler particles of any or all of the above-mentioned filler particle types (a) - (e) have a mean size d ₅ o of at least 0.1 μm, preferably of at least 0.3 μm, and particularly preferably of at least 0, 5 μιη possess, and a mean size of at most 10 μιη, preferably of at most 7 μιη and more preferably of at most 5 μιη possess.

3. The cigarette paper of claim 2, wherein the filler of platelet shape and / or the filler having a cubic shape a mean size d ₅ o of at least 0.5 μιη, preferably at least 1.0 μιη, and of at most 5 μιη, preferably of at most 3 μιη has.

4. A cigarette paper according to one of the preceding claims, wherein the following applies to the particle size distribution of the filler with a platelet-shaped configuration: p> 0.5, preferably p> 0.6 and p <1.0, preferably p <0.9.

5. Cigarette paper according to one of the preceding claims, wherein the following applies to the particle size distribution of the filler with a cubic shape: p> 0.2, preferably p> 0.3 and p <0.7, preferably p <0.6.

6. A cigarette paper according to any one of the preceding claims wherein the platelet-shaped filler particles have a length 1, a width d and a thickness d corresponding to the respective maximum dimensions in three mutually orthogonal spatial directions, both the length 1 and the width b is at least twice as large, preferably at least four times as large as the thickness d.

7. A cigarette paper according to any one of the preceding claims, wherein the Füllstoffpar- particles of any or all Füllstoffpartikelarten (a) - (e) are formed by metal salts, metal oxides or metal hydroxides, in particular calcium carbonate, titanium dioxide, magnesium oxide, magnesium hydroxide or aluminum hydroxide.

8. cigarette paper according to one of the preceding claims, wherein the filler is formed by precipitated calcium carbonate, in particular by calcite.

A cigarette paper according to any one of the preceding claims wherein the composition comprises a material capable of reducing its diffusion capacity when applied to cigarette paper, in particular a film-forming material, preferably a material selected from the group consisting of starch, starch derivatives, cellulose , Cellulose derivatives, dextrins, guar, or gum arabic and alginates, in particular oxidized starch or sodium alginate.

10. A cigarette paper according to one of the preceding claims, wherein the amount of material applied in the treated subregions, expressed as mass / application surface in the dried state, at least 0.5 g / m ² , preferably at least 1 g / m ² and / or at most 12 g / m ² , preferably at most 8 g / m ² .

11. A cigarette paper according to one of the preceding claims, wherein the diffusion capacity in the treated portion - after heating to 230 ° C for 30 min under air atmosphere, cooling and conditioning of the paper according to ISO 187: 1990 - at least 0.05 cm / s, preferably at least 0.1 cm / s and at most 2 cm / s, preferably at most 1 cm s.

12. A cigarette paper according to one of the preceding claims, wherein the at least one treated portion is arranged on the screen side of the cigarette paper.

13. A cigarette paper according to any one of the preceding claims, wherein the diffusion capacity in the at least one treated portion - measured after heating the cigarette paper at 230 ° C for 30 minutes under air atmosphere, then cooling and conditioning according to ISO 187: 1990 - by a factor of between 2 and 4 is less than in an untreated area of the cigarette paper, wherein at least 20% by weight, preferably at least 50% and more preferably at least 70% by weight of the filler particles in the treated portion are formed by a filler having a platelet shape are.

14. A cigarette paper according to one of the preceding claims, wherein the diffusion capacity in the at least one treated portion - measured after heating the cigarette paper to 230 ° C for 30 min under air atmosphere, subsequent- the cooling and conditioning according to ISO 187: 1990 - by a factor of between 5 and 8 is lower than in an untreated area of the cigarette paper, wherein at least 20 wt .-%, preferably at least 50 wt .-% and particularly preferably at least 70 wt. -% of FuUstoffpartikel in the treated portion are formed by a filler having a cubic shape.

15. A cigarette paper according to one of the preceding claims, wherein the diffusion capacity in the at least one treated portion - measured after heating the cigarette paper at 230 ° C for 30 min under air atmosphere, then cooling and conditioning according to ISO 187: 1990 - by a factor of between 3 and 6 is less than in an untreated region of the cigarette paper, wherein at least 20 wt .-%, preferably at least 50 wt .-% and particularly preferably at least 70 wt .-% of the FUUstoffpartikel in the treated portion by a filler having a scalenohedral crystal structure and is formed with a particle size distribution, for which applies:

p <0.3, preferably p <0.25, and more preferably p <0.2.

16. A cigarette paper according to any one of the preceding claims, wherein the diffusion capacity in the at least one treated portion - measured after heating the cigarette paper at 230 ° C for 30 minutes under air atmosphere, then cooling and conditioning according to ISO 187: 1990 - by a factor of less is less than in an untreated region of the cigarette paper, wherein at least 20 wt .-%, preferably at least 50 wt .-% and particularly preferably at least 70 wt .-% of the FUUstoffpartikel in the treated portion by a filler having a rhombohedral crystal structure with a Particle size distribution is formed, for which applies:

p> 0.5, preferably p> 0.6, and more preferably p> 0.7.

17. A method of producing a cigarette paper, comprising the steps of:

Making a base paper, and

Treating at least a portion of the base paper with a composition containing fluoride particles or a mixture of filler particles to the To reduce the diffusion capacity in the treated portion relative to the diffusion capacity of the base cigarette paper;

(a) a filler having a platy shape,

p <0.3, preferably p <0.25, and more preferably p <0.2

p> 0.5, preferably p> 0.6, and more preferably p> 0.7

(d) a filler having a cubic shape or

p> 0.40, preferably p> 0.45 and

p <0.60, preferably p <0.55, where: p = d ₅ o / (d ₉ o -dio).

18. The method of claim 17, wherein the composition is at least

1 wt .-%, preferably at least 3 wt .-% and at most 20 wt .-%, preferably at most 10 wt .-% is formed from filler particles.

19. A method according to claim 17 or 18, wherein the composition comprises a material capable of reducing its diffusion capacity when applied to cigarette paper, in particular a film-forming material, wherein the film-forming material is preferably selected from the group consisting of starch, starch derivatives, cellulose, cellulose derivatives, dextrins, guar or gum arabic and alginates, and in particular oxidized starch or sodium alginate.

20. The method of claim 19, wherein the diffusion capacity reducing material in the composition in a proportion of at least 0.1 wt .-%, preferably at least 1 wt .-% and particularly preferably at least 3 wt .-% and / or in a content of at most 40 wt .-%, preferably at most 30 wt .-% and particularly preferably at most 25 wt .-% is included.

21. The method according to any one of claims 17 to 20, wherein the composition comprises a solvent which forms a solution or suspension with the material which is capable of reducing the diffusion capacity when applied to the cigarette paper.

22. The method according to any one of claims 19 to 21, comprising the following steps:

Diverting a first portion of the preliminary composition,

Adding filler containing at least one or more of the types of fillers (a) - (e) mentioned in claim 17 to the branched first portion of the preliminary composition to form a first composition, and treating portions of the base cigarette paper with the first composition.

23. The method of claim 22, further comprising the steps of:

Branching a second portion of the preliminary composition, adding fillers containing at least one of the types of fillers (a) - (e) mentioned in claim 17 to the branched second portion of the preliminary composition to form a second composition, the selection of the added ones Filler particles differ in type or proportion from those of the first composition, and Treating portions of a base cigarette paper with the second composition.

The method of claim 22 or 23, wherein the addition of the fillers is made to the abgi branched portion of the preliminary composition in the applicator or a supply line to the applicator for applying the first or second composition.

Method according to one of claims 17 to 24, wherein the composition is applied in a printing process, in particular gravure or flexographic printing, wherein the composition preferably has a flow time of at least 10 s, preferably at least 12 s and at most 35 s, preferably at most 25 s, measured with an outlet cup with 4 mm opening according to ÖNORM EN ISO 2431: 2001 at a temperature of the composition of 60 ° C,

or applied in a spraying process.

Method according to one of claims 17 to 25, in which the paper is rewetted after application of the composition and then dried under mechanical tension to avoid wrinkles in the paper, preferably in the composition substances for reducing wrinkling, in particular propylene glycol or Glycerol are included.

Process for producing a cigarette paper, comprising the following steps:

A providing a base paper,

C at least approximately measuring the diffusion capacity in a treated area,

D determining whether the measured diffusion capacity deviates from a So 11 value, E in the event that a deviation between the measured diffusion capacity and the set point exceeds a predetermined threshold, providing a modified composition that differs from the composition of step B at least in that at least a portion of the first filler is replaced by a second filler which differs from the first filler by one of the shape, crystal structure and particle size distribution characteristics to reduce the deviation of the diffusion capacity from the target value.

28. The method of claim 27, wherein the steps B - E are repeated until the deviation between the measured diffusion capacity and the desired value falls below a limit value.

29. The method of claim 27 or 28, wherein the at least approximately measurement of the diffusion capacity by measuring transmission, absorption and / or reflection of electromagnetic radiation.

30. The method of claim 27, wherein, in the event that the diffusion capacity measured in step D is below the target value, the second filler is formed at least partially by one or more of the following filler particle types:

(a) a filler having a platy shape,

p <0.3, preferably p <0.25, and more preferably p <0.2

p> 0.5, preferably p> 0.6, and particularly preferably p> 0.7, where: p = d ₅ o (d9o

The method of any one of claims 27-29, wherein, in the event that the diffusion capacity measured in step D is above the set point, the second filler is formed at least in part by one or both of the following types of filler particles:

(d) a filler having a cubic shape or

p> 0.40, preferably p> 0.45 and

p <0.60, preferably p <0.55, where: p = d ₅ o / (d ₉ o -dio).

A method according to any one of claims 27 to 31, wherein the composition comprises two types of fillers which differ in one of shape, crystal structure and particle size distribution and one of which - with the same weight fraction and otherwise the same composition - has a higher diffusion capacity in the treated one Range performs as the other, and wherein in step E, the proportionate ratio of the two fillers in the composition is changed from the composition of step B to reduce the deviation of the diffusion capacity from the target value.

A cigarette having a cigarette paper surrounding a tobacco column, the cigarette paper being a cigarette paper according to any one of claims 1 to 16.

A cigarette according to claim 33, wherein the filler or mixture of filler species in the composition is selected such that

but extinguishes the cigarette with a probability of at least 75% in a test according to ISO 12863: 2010 when burned free in the air with a probability of at least 50% over the length of their entire tobacco rod glimmers without extinguishing by itself.