EP2760297B1 - Improved cigarette paper for self-extinguishing cigarettes - Google Patents

Improved cigarette paper for self-extinguishing cigarettes Download PDF

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Publication number
EP2760297B1
EP2760297B1 EP20130779596 EP13779596A EP2760297B1 EP 2760297 B1 EP2760297 B1 EP 2760297B1 EP 20130779596 EP20130779596 EP 20130779596 EP 13779596 A EP13779596 A EP 13779596A EP 2760297 B1 EP2760297 B1 EP 2760297B1
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EP
European Patent Office
Prior art keywords
band
cigarette paper
cigarette
area
central zone
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EP20130779596
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German (de)
French (fr)
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EP2760297A1 (en
Inventor
Roland Zitturi
Dietmar Volgger
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Delfortgroup AG
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Delfortgroup AG
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Priority to PL13779596T priority Critical patent/PL2760297T3/en
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/02—Cigars; Cigarettes with special covers
    • A24D1/025—Cigars; Cigarettes with special covers the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/005—Treatment of cigarette paper

Definitions

  • the present invention relates to a cigarette paper that gives self-extinguishing properties of a cigarette made from it, wherein the acceptance of this cigarette in the smoker is affected as little as possible and the content of carbon monoxide in the smoke is reduced compared to comparable cigarettes. More particularly, it relates to a cigarette paper to which a pattern in the form of ribbons having certain properties is applied, and to a cigarette made therefrom.
  • a smoldering cigarette on a defined substrate for example, 10 layers of the filter paper Whatman no. 2, and it is observed whether the cigarette extinguished before the entire visible tobacco part is turned off. This is called self-extinguishment (SE).
  • SE self-extinguishment
  • the proportion of self-extinguished cigarettes on the substrate is expressed as a percentage of the total number of cigarettes tested. Often the legal requirements require that of 40 tested cigarettes at least 30 must extinguish, so SE ⁇ 75%.
  • One way to achieve self-extinguishment of a cigarette in this test is to print ribbons on the cigarette paper transversely so that they lie circumferentially on a cigarette made from this cigarette paper.
  • These Tapes may be made of a variety of materials, for example, cellulose, cellulose derivatives, starch, starch derivatives or alginates have achieved commercial importance.
  • these bands are based primarily on the fact that they hinder the access of oxygen to the cone of smoke of the cigarette and thus lead to self-extinction of the cigarette. Since the access of oxygen during glaring is primarily determined by the concentration difference between the interior of the cigarette and the environment, that is, by the diffusion, it is important to choose the diffusion capacity of these bands sufficiently low.
  • the measurement of the diffusion capacity of such bands can be carried out with a corresponding measuring device from Sodim ( CO 2 Diffusivity Meter) .
  • Sodim CO 2 Diffusivity Meter
  • Another disadvantage of the self-extinguishing cigarette is that the material that has been applied in the tapes on the cigarette paper, with the tobacco part of the cigarette burns, is smoked by the smoker and thus can change the taste of the cigarette. Again, there is great interest in minimizing such taste changes.
  • the cigarette Even if the cigarette has self-extinguishing properties on a suitable substrate, it should not extinguish by itself during normal smoking, for example in the ashtray.
  • the repeated lighting of the cigarette severely affects the acceptance of such cigarettes by the smoker and may also adversely affect the composition of the smoke in terms of toxicity.
  • the cigarette is conditioned to ISO 3402, then lit and stored in a horizontal position so that the air through free convection from all sides unhindered access to the cigarette has.
  • FB Free-Burn
  • the value for FB is as high as possible.
  • a value of at least 30% for FB is acceptable, but preferably the value should be 70% or higher.
  • a known approach which has also found commercial dissemination, is to divide a 6 mm wide band into two bands of 3 mm each and separate them 1 mm apart. This achieves improvements in FB, however, while the area covered by the tapes on the cigarette paper is the same size as in the normal 6 mm wide tape, so that the amount of material applied in the tapes is at least not lower, so there are no advantages in terms of taste or Carbon monoxide content of the smoke can be expected.
  • the present invention has for its object to provide a cigarette paper that gives a cigarette made therefrom sufficiently high SE values to comply with the legal requirements, but on this cigarette at the same time the highest possible FB value, and a reduced carbon monoxide in the smoke causes and affects the taste as little as possible.
  • the inventors have found that in this particular belt form, a better balance of self-extinguishing characteristics (high value for SE) on the one hand and the ability to free glow (high value for FB), less material application and lower CO Concentration in the smoke, on the other hand, can be better reconciled than with the bands of the prior art. More specifically, the inventors have found that it is not necessary for the purposes of self-extinguishing that the tape consists of a full-surface printed area. Instead Suffice it that a relatively narrow, substantially full-surface printed outer zone can inhibit the glow of the cigarette sufficiently, but then it is not absolutely necessary that the glowing in the following area, ie the middle zone, is printed over the entire surface.
  • the term "applied substantially over the entire surface” is intended to include both the preferred case that actually 100% of the outer zones are printed, as well as cases where there are very small unprinted areas due to process-related fluctuations.
  • the material application can therefore contain recesses, as long as three conditions are met.
  • at least 70%, preferably at least 75% of the area of the central zone should be printed to ensure reliable self extinguishment.
  • the surface to which the material is applied should be path-coherent in the topological sense. This means that there is always a steady path between any two points on the printed surface of a band that connects the two dots and runs entirely in the printed area. Simply put, the recesses in the printed area must not divide the printed area into several separate parts.
  • the middle zone alone is path-coherent, that between two arbitrary points of the printed area of the middle zone of a band there is always a steady path connecting the two points and the whole in the printed area of the middle one Zone runs.
  • Investigations by the inventors have shown that the property of being path-coherent is an essential criterion for ensuring the self-extinguishment, which has independent significance in addition to the areal proportion of the material application in the middle zone.
  • the band edges are preferably straight and parallel to each other. Deviating from this, for example, wavy band edges are less suitable for the purposes of the invention, but nevertheless should not lead out of the scope of the invention.
  • outer edges of the central zone referred to above are here two imaginary lines, straight and parallel to the band edges, indicating at which point of the band, viewed from outside to inside, the recesses in the material application begin , Namely, while the material in the outer zones is applied substantially to the entire surface, the outer edge of the middle zone, or in other words the boundary between the central zone and the adjacent outer zone is defined by the line on which said material is not applied over the entire surface but on which one of the recesses mentioned begins.
  • the bands have certain symmetry properties.
  • the bands are applied to the cigarette paper so that they come to rest in the circumferential direction in a cigarette made therefrom, d. H. essentially in the transverse direction of the paper, that is to say essentially orthogonal to the running direction of the paper web through the paper machine.
  • the bands should have the same functional properties in both directions of glow.
  • the pattern of application of the material within a band consists of two halves separated by an imaginary centerline of the band, the order pattern of a band half being mirrored at the centerline or rotated 180 ° about a centerline pivot point and a centerline optional parallel shift parallel to the center line in the order pattern of the other half band can be transferred.
  • the tape has a width of at least 4 mm, more preferably at least 5 mm.
  • the band should not exceed a width of 10 mm, preferably 7 mm.
  • a width of about 6 mm has proven to be particularly suitable, which corresponds to the width of such bands usual in the field, but due to the incomplete application of material in the central zone a better FB value, a lower CO content in the smoke and Total less material is allowed.
  • the distance between the bands is at least 5 mm, preferably at least 10 mm, and more preferably at least 15 mm. However, the distance should be at most 50 mm, preferably at most 30 mm and more preferably at most 25 mm. Particularly preferably, the spacing of the bands is selected so that there are at least two complete bands on a cigarette made from this paper. Furthermore, the tape must have a sufficiently low diffusion capacity to ensure self-extinction according to ISO 12863.
  • the band preferably has a diffusion capacity of at most 1.0 cm / s, preferably at most 0.8 cm / s and / or at least 0.01 cm / s, preferably at least 0.1 cm / s.
  • the amount of material applied to the strip is preferably at least 1 g / m 2 , preferably at least 3 g / m 2 and / or at most 8 g / m 2 , preferably at most 6 g / m 2 . With such order quantities, the desired properties can be achieved in an advantageous manner.
  • the amount of material per printed area is substantially constant.
  • the term "substantially constant” should in particular mean that it varies by less than 10%, preferably by less than 5%. If the application is carried out in a gravure printing process, this can be ensured, for example, by the fact that the volumes of the cells of the gravure cylinder differ by less than 10%, preferably by less than 5% from each other.
  • the diffusion capacity reducing material comprises a material selected from the group consisting of starch, starch derivatives, cellulose, cellulose derivatives and alginates, or a mixture thereof.
  • the diffusion capacity reducing material may contain a filler, in particular a carbonate or an oxide, preferably lime, magnesium oxide, aluminum hydroxide or a mixture thereof.
  • the diffusion capacity reducing material may also contain a fire salt, in particular trisodium citrate or tripotassium citrate or a mixture thereof being suitable.
  • the invention is applicable to all known cigarette papers, also irrespective of whether the paper is intended for machine-made or handmade cigarettes.
  • the untreated cigarette paper has an air permeability according to ISO 2965, which is between 5CU and 300 CU, preferably between 10 CU and 200 CU.
  • the untreated cigarette paper additionally or alternatively has a basis weight of between 10 g / m 2 and 60 g / m 2 , preferably between 20 g / m 2 and 40 g / m 2 .
  • the cigarette paper may comprise wood pulp, pulp of annual plants, especially flax or hemp, or other fibrous materials such as sisal or jute, or a mixture thereof.
  • the untreated cigarette paper may contain a filler whose proportion based on the total paper mass is at least 10% by weight, preferably at least 15% by weight and / or at most 45% by weight, preferably at most 40% by weight.
  • the filler may be formed in particular by a carbonate or an oxide, preferably by precipitated lime, magnesium oxide, aluminum hydroxide or mixtures thereof.
  • the cigarette paper preferably contains a fire salt, in particular trisodium citrate, tripotassium citrate or a mixture thereof.
  • the proportion of the Brandsalzes based on the mass of the untreated cigarette paper is preferably at most 5 wt .-% and particularly preferably between 0.5 wt .-% and 3.0 wt .-%.
  • the cigarette paper may be coated on its entire or parts of its surface with compositions containing, for example, flavorings or the ingredients of the smoke, in particular the so-called Hoffmann analytes, unless these compositions contribute significantly to the self-extinction of a cigarette made from this paper.
  • Such coatings may be applied on either side of the paper or on both sides and may be applied before or after the application of the tapes of the invention.
  • the invention further relates to a method for producing a cigarette paper according to one of the abovementioned embodiments.
  • said material is applied in the form of a composition, in particular a solution, an emulsion or a suspension which contains a solvent and said material.
  • solvent is to be understood broadly and should in particular not suggest that the composition is actually a "solution” in the chemical sense, instead, as said, suspensions are also conceivable as suitable and preferred compositions.
  • the solvent is water because it is toxicologically safe.
  • organic solvents can also be used, of which, however, even after the paper has dried, residues always remain in the paper, which can impair the odor of the paper. The odor of such residues of organic solvents is sometimes found annoying by the smoker when the cigarette pack is opened for the first time.
  • the material that remains on the paper after drying must be capable of occluding the pores of the cigarette paper by forming a film on the surface of the paper or by penetrating the pores so as to reduce the diffusion capacity of the paper in the printed areas .
  • Starch and starch derivatives, cellulose and cellulose derivatives and alginates or a mixture thereof are particularly suitable for these purposes.
  • the proportion is 5 wt .-% to 30 wt .-%, preferably 10 wt .-% to 25 wt .-% based on the composition. In many cases, one will choose the proportion of material remaining on the paper in the composition based on the viscosity required by the application process.
  • said composition is applied in a printing process, in particular gravure printing or flexographic printing, which can be carried out easily and stably on an industrial scale.
  • a printing process in particular gravure printing or flexographic printing, which can be carried out easily and stably on an industrial scale.
  • An order, for example, by spraying is also possible.
  • the order is preferably carried out on that side of the cigarette paper, which faces the tobacco, so the inside, on a cigarette made therefrom.
  • this is the screen side, as it has a lower lime content compared to the top, which has a positive effect on the visual appearance of the tobacco ashes.
  • An order on the better for the pressure itself suitable top is easily possible, but not preferred.
  • the preferred embodiment is to apply all the material in one layer. This avoids the need to precisely position the individual layers of a tape one above the other. This is difficult because the bands per se on the cigarette should not be visible and therefore can hardly be detected with conventional sensors. In practice this has the consequence that the edges of the individual printed layers are not precisely superimposed, so that there is a gradual decrease in the amount of material applied during the transition from the printed to the unprinted areas, which is undesirable.
  • the composition may also contain substances that reduce wrinkling, such as propylene glycol or glycerin.
  • Other substances, such as dyes or flavorings, may also be included in the composition, provided that they do not significantly negatively impact the self-extinction of the cigarette made from this paper. In principle, legal and toxicological aspects must be taken into account when selecting all substances and materials.
  • the paper is aftertreated to remove or reduce wrinkles.
  • the paper is subsequently moistened and subjected to a further drying process, preferably under mechanical stress, for example stretching or stretching of the paper web.
  • This "mechanical" wrinkle removal process is advantageous in that it can eliminate the need for additional substances in the composition.
  • the belt 10 runs on the paper in the transverse direction, indicated by an arrow 12 and delimited by two belt edges 14a and 14b from the untreated cigarette paper (not shown).
  • the imaginary, straight, parallel and transverse lines 16a and 16b separate outer zones 18a and 18b from a central zone 20.
  • the one outer zone 18a is thus located between the band edge 14a and the imaginary line 16a and the other outer zone 18b between the band edge 14b and the imaginary line 16b.
  • the middle zone 20 is bounded by the two imaginary lines 16a and 16b.
  • the outer zones 18a and 18b are substantially printed over the entire surface, while the lines 16a and 16b themselves are not printed along their entire length.
  • the middle zone 20 is not printed over the entire surface.
  • the printed area or the application area 22 is in Fig. 3 indicated by hatching in the left part of the figure and is broken through recesses 24 without material. In this sense, the middle zone 20 is not "printed over the entire surface".
  • the surface 22 to which the material is applied is path-coherent in the topological sense. This means that between any two points of the printed area or application surface 22 of the band 10 there is a continuous path that extends completely within the printed area 22. Likewise, in this sense, the printed area of the middle zone 20 is path-coherent.
  • the band 10 of Fig. 3 is mirror-symmetrical with respect to a center line 26 which extends in the longitudinal direction of the belt 10. This means that the tape 10 has the same self-extinguishing behavior regardless of the glow direction. Therefore, it is not necessary in the preparation of the cigarette paper to decide on which direction it will smolder in the cigarette made therefrom.
  • a likewise suitable for this purpose symmetry is a rotational symmetry about a pivot point, which on the Centerline 26 is located. This is for example in the band of Fig. 2 the case.
  • In the volume of Fig. 6 go the two band halves above and below the midline (in Fig. 6 not shown) by a reflection at the centerline in combination with a parallel translation along the centerline apart, which is also a suitable symmetry to evoke glow direction independent behavior.
  • cigarette paper As the cigarette paper, a commercial cigarette paper of wood pulp and precipitated lime as a filler having a basis weight of 24 g / m 2 , a filler content of 33% by weight and an air permeability of 75 CU was used. The cigarette paper also contained 1% by weight of tripotassium citrate as the fire salt.
  • the diffusion capacity of the tapes was measured after conditioning the paper according to ISO 187 with a CO 2 diffusivity meter from Sodim.
  • the probe had an aperture of 4 ⁇ 20 mm and was positioned so that the entire opening was within the band.
  • the diffusion capacity of all print samples was between 0.09 cm / s and 0.60 cm / s.
  • the cigarettes were machine smoked according to a method specified in ISO 4387, and the content of carbon monoxide was determined from the collected gas phase.
  • the print pattern of FIG. 2 has a SE value of 100%, but the value for FB is quite low at 30%. But since the value is significantly higher than that for the 6 mm wide, full-surface band, the print pattern of FIG. 2 still considered to be according to the invention. A small increase in the diffusion capacity can still increase the value for FB, without endangering the sufficient self-extinction.
  • the print patterns of Figures 3 - 5 are among the preferred embodiments because for all these print patterns, both the value for SE and that for FB are very high.
  • the print pattern of FIG. 6 shows very good values for FB, but the value for SE at 70% is just below the usual legal requirements of 75%.
  • the value for SE can be further increased by a slight reduction of the diffusion capacity, without lowering too much for FB.
  • the print pattern of FIG. 7 is not according to the invention because the value for SE is no longer sufficiently high. This pattern shows that despite a high proportion of the printed area in the central zone 20 of 84.16%, sufficient self-extinguishing is not ensured. In this print pattern, neither the entire printed area 22 nor the printed area of the central zone 20 is path-coherent, but it is split into two parts, both of which do not co-operate sufficiently to ensure self-extinction. The self-extinguishing test shows that the cigarette can continue to glaze along the unprinted areas across the belt 10, thus overcoming the belt.
  • the print pattern of FIG. 8 is not wegzusammen packedd and therefore not according to the invention, but falls into three parts.
  • the self-extinguishing (SE) rate is 60% too low.
  • the print pattern of FIG. 9 with a share of 67.84% printed area 22 in the middle zone 20, a far too low rate for self extinguishment.
  • this pattern is not in accordance with the present invention because the proportion of printed area in the middle zone is too low and, moreover, the central area is not path-coherent so that the cigarette may continue to glow along the unprinted channels in the belt.
  • the print pattern of FIG. 10 is not according to the invention. This pattern has not been tested because no behavior substantially different from the likewise not according to the invention printing pattern of FIG. 7 is to be expected.
  • the printed area 22 is path-coherent while the printed area of the middle zone 20 is not path-coherent. This shows that these two properties are independent of each other.
  • the printing patterns of the Figures 2-9 only 67.84% to 92.80% of the area of the middle zone 20 printed. This means a savings of about 7% to about 23% of the material compared to a full-surface, 6 mm wide band and thus a smaller impact on the taste of the cigarette.
  • the patterns according to the invention can also be printed efficiently in a single-layer application, so that it is possible to dispense with the variation of the application quantity within the printed surface as proposed in the prior art.
  • the printing patterns according to the invention are of such a nature that material is essentially only applied to the cigarette paper where it contributes directly to self-extinguishment. In this way, the applied amount of material can be minimized and one achieves a reduction of the content of carbon monoxide in the smoke and a minimization of the taste influence.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft ein Zigarettenpapier, das einer daraus gefertigten Zigarette selbstverlöschende Eigenschaften verleiht, wobei die Akzeptanz dieser Zigarette beim Raucher möglichst wenig beeinträchtigt wird und der Gehalt an Kohlenmonoxid im Rauch gegenüber vergleichbaren Zigaretten reduziert ist. Insbesondere betrifft sie ein Zigarettenpapier, auf das ein Muster in Form von Bändern mit bestimmten Eigenschaften aufgebracht ist, sowie eine daraus gefertigte Zigarette.The present invention relates to a cigarette paper that gives self-extinguishing properties of a cigarette made from it, wherein the acceptance of this cigarette in the smoker is affected as little as possible and the content of carbon monoxide in the smoke is reduced compared to comparable cigarettes. More particularly, it relates to a cigarette paper to which a pattern in the form of ribbons having certain properties is applied, and to a cigarette made therefrom.

HINTERGRUND UND STAND DER TECHNIKBACKGROUND AND PRIOR ART

Es ist ein Ziel der Tabakindustrie, Zigaretten zu produzieren, die eine geringere Tendenz besitzen, Brände auszulösen. Derartige Zigaretten sind bereits Bestandteil gesetzlicher Regelungen in verschiedenen Ländern und Regionen, wie zum Beispiel USA, Kanada, Europa oder Australien. Zur Feststellung, ob eine Zigarette eine geringere Neigung hat Brände auszulösen, bedient man sich eines in ISO 12863 oder ASTM E2187 beschriebenen Tests.It is a goal of the tobacco industry to produce cigarettes that have a lower tendency to cause fires. Such cigarettes are already part of legal regulations in various countries and regions, such as USA, Canada, Europe or Australia. To determine if a cigarette has a lower propensity to cause fire, use one of the tests described in ISO 12863 or ASTM E2187.

Dabei wird eine glimmende Zigarette auf einem definierten Substrat, beispielsweise 10 Lagen des Filterpapiers Whatman No. 2, platziert und man beobachtet, ob die Zigarette verlöscht, bevor der gesamte sichtbare Tabakteil verglimmt ist. Dies bezeichnet man als "Selbstverlöschung" ("Self-Extinguishment", SE). Der Anteil der auf dem Substrat von selbst verlöschten Zigaretten wird in Prozent bezogen auf die Gesamtzahl der getesteten Zigaretten angegeben. Vielfach verlangen die gesetzlichen Bestimmungen, dass von 40 getesteten Zigaretten mindestens 30 verlöschen müssen, also SE≥75%.In this case, a smoldering cigarette on a defined substrate, for example, 10 layers of the filter paper Whatman no. 2, and it is observed whether the cigarette extinguished before the entire visible tobacco part is turned off. This is called self-extinguishment (SE). The proportion of self-extinguished cigarettes on the substrate is expressed as a percentage of the total number of cigarettes tested. Often the legal requirements require that of 40 tested cigarettes at least 30 must extinguish, so SE≥75%.

Ein Weg, um die Selbstverlöschung einer Zigarette in diesem Test zu erreichen, besteht darin, Bänder auf das Zigarettenpapier in Querrichtung aufzudrucken, sodass sie auf einer aus diesem Zigarettenpapier gefertigten Zigarette in Umfangsrichtung zu liegen kommen. Diese Bänder können aus den unterschiedlichsten Materialien bestehen, wobei zum Beispiel Zellulose, Zellulosederivate, Stärke, Stärkederivate oder Alginate kommerzielle Bedeutung erlangt haben.One way to achieve self-extinguishment of a cigarette in this test is to print ribbons on the cigarette paper transversely so that they lie circumferentially on a cigarette made from this cigarette paper. These Tapes may be made of a variety of materials, for example, cellulose, cellulose derivatives, starch, starch derivatives or alginates have achieved commercial importance.

Die Funktionsweise dieser Bänder beruht vorwiegend darauf, dass sie den Zutritt von Sauerstoff zum Glutkegel der Zigarette behindern und damit zur Selbstverlöschung der Zigarette führen. Da der Zutritt von Sauerstoff während des Glimmens primär durch die Konzentrationsdifferenz zwischen dem Inneren der Zigarette und der Umgebung bestimmt wird, also durch die Diffusion, kommt es darauf an, die Diffusionskapazität dieser Bänder ausreichend gering zu wählen.The function of these bands is based primarily on the fact that they hinder the access of oxygen to the cone of smoke of the cigarette and thus lead to self-extinction of the cigarette. Since the access of oxygen during glaring is primarily determined by the concentration difference between the interior of the cigarette and the environment, that is, by the diffusion, it is important to choose the diffusion capacity of these bands sufficiently low.

Die Messung der Diffusionskapazität solcher Bänder kann mit einem entsprechenden Messgerät der Firma Sodim (CO2 Diffusivity Meter) erfolgen. Die Diffusionskapazität beschreibt dabei einen durch Konzentrationsunterschied getriebenen Gastransport durch das Zigarettenpapier. Sie bezeichnet daher das durch das Papier pro Zeiteinheit, pro Flächeneinheit und pro Konzentrationsdifferenz tretende Gasvolumen und hat somit die Einheit cm3/(cm2 s) = cm/s.The measurement of the diffusion capacity of such bands can be carried out with a corresponding measuring device from Sodim ( CO 2 Diffusivity Meter) . 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.

Die für die Selbstverlöschung der Zigarette notwendige niedrige Diffusionskapazität der auf das Zigarettenpapier aufgebrachten Bänder behindert aber nicht nur den Sauerstofftransport zum Glutkegel sondern auch den Transport von Gasen, insbesondere von Kohlenmonoxid, aus dem Inneren der Zigarette nach außen in die Umgebung. Deshalb beobachtet man bei einer mit Bändern ausgestatteten selbstverlöschenden Zigarette einen höheren Gehalt an Kohlenmonoxid im Rauch verglichen mit derselben Zigarette ohne Bänder. Nun soll aber die potenziell erhöhte Brandsicherheit nicht die Toxizität des Rauchs steigern, weshalb ein großes Interesse daran besteht, den Gehalt an Kohlenmonoxid im Rauch zumindest nicht zu erhöhen. Zusätzlich ist der Gehalt an Kohlenmonoxid im Rauch auch in manchen Ländern durch gesetzliche Bestimmungen beschränkt.However, the necessary for the self-extinction of the cigarette low diffusion capacity of the applied to the cigarette paper tapes not only the oxygen transport to the cone of embers but also the transport of gases, especially carbon monoxide, from the inside of the cigarette to the outside in the environment. Therefore, in a self-extinguishing cigarette equipped with tapes, a higher content of carbon monoxide in the smoke is observed compared to the same cigarette without tapes. However, the potentially increased fire safety should not increase the toxicity of the smoke, which is why there is great interest in at least not increasing the content of carbon monoxide in the smoke. In addition, the content of carbon monoxide in the smoke is also limited by law in some countries.

Ein weiterer Nachteil der selbstverlöschenden Zigarette besteht darin, dass das Material, das in den Bändern auf das Zigarettenpapier aufgebracht wurde, mit dem Tabakteil der Zigarette verbrennt, vom Raucher mitgeraucht wird und damit den Geschmackseindruck der Zigarette verändern kann. Auch hier besteht ein großes Interesse, solche Geschmacksveränderungen zu minimieren.Another disadvantage of the self-extinguishing cigarette is that the material that has been applied in the tapes on the cigarette paper, with the tobacco part of the cigarette burns, is smoked by the smoker and thus can change the taste of the cigarette. Again, there is great interest in minimizing such taste changes.

Schließlich soll die Zigarette, auch wenn sie auf einem geeigneten Substrat selbstverlöschende Eigenschaften besitzt, nicht beim normalen Rauchen, beispielsweise im Aschenbecher, von selbst verlöschen. Das wiederholte Anzünden der Zigarette beeinträchtigt die Akzeptanz solcher Zigaretten beim Raucher stark und kann außerdem die Zusammensetzung des Rauchs hinsichtlich der Toxizität negativ beeinflussen.Finally, even if the cigarette has self-extinguishing properties on a suitable substrate, it should not extinguish by itself during normal smoking, for example in the ashtray. The repeated lighting of the cigarette severely affects the acceptance of such cigarettes by the smoker and may also adversely affect the composition of the smoke in terms of toxicity.

Ein Test, um das Selbstverlöschen beim freien Glimmen, also ohne Substrat, zu bestimmen, ist nicht standardisiert und auch nicht Bestandteil gesetzlicher Regelungen. Zumeist wird die Zigarette nach ISO 3402 konditioniert, danach angezündet und in einer horizontalen Position so gelagert, dass die Luft durch freie Konvektion von allen Seiten unbehindert Zutritt zur Zigarette hat. Eine bestimmte Zahl an Zigaretten, beispielsweise 40 Stück, wird nach diesem Verfahren getestet, und es wird ermittelt, bei welchem Anteil der Zigaretten der gesamte sichtbare Tabakteil abglimmt, die Zigarette also nicht von selbst verlöscht. Dieser Anteil wird oft als Free-Burn (FB) bezeichnet und in Prozent angegeben. Obwohl nicht Bestandteil gesetzlicher Bestimmungen besteht ein Interesse in der Industrie, dass möglichst wenig Zigaretten in diesem Test verlöschen, also der Wert für FB möglichst hoch ist. Generell ist ein Wert von mindestens 30% für FB akzeptabel, bevorzugt sollte der Wert aber 70% oder höher sein.A test to determine the self-extinction in free glare, ie without substrate, is not standardized and not part of legal regulations. In most cases, the cigarette is conditioned to ISO 3402, then lit and stored in a horizontal position so that the air through free convection from all sides unhindered access to the cigarette has. A certain number of cigarettes, for example 40 pieces, is tested by this method, and it is determined at which portion of the cigarettes the entire visible tobacco part smolders, so the cigarette does not extinguish by itself. This percentage is often referred to as Free-Burn (FB) and expressed as a percentage. Although not part of legal regulations there is an interest in the industry that as few cigarettes go out in this test, so the value for FB is as high as possible. Generally, a value of at least 30% for FB is acceptable, but preferably the value should be 70% or higher.

Aus dem Stand der Technik ist bekannt, dass eine Mindestbreite der Bänder von 4 mm erforderlich ist, um Selbstverlöschung überhaupt zu erreichen. In der Praxis stellt sich jedoch zumeist heraus, dass zur Einhaltung der gesetzlichen Bestimmungen typischerweise 6 mm breite, vollflächig bedruckte Bänder auf dem Zigarettenpapier notwendig sind. Die notwendige Breite der Bänder hängt dabei wesentlich von der gewählten Tabakmischung ab. Der Abstand zwischen den Bändern ergibt sich üblicherweise aus der Länge des Tabakteils der Zigarette, da oft gesetzlich gefordert wird, dass sich zumindest zwei Bänder auf dem Tabakteil befinden müssen.It is known from the prior art that a minimum width of 4 mm bands is required in order 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 necessary width of the bands depends essentially on the selected tobacco mixture. The distance between the bands usually results from the length of the tobacco part of the cigarette, since it is often required by law that at least two bands must be on the tobacco part.

Insgesamt möchte man also die sich teilweise widersprechenden Ziele eines hohen Werts für SE und eines hohen Werts für FB bei unverändertem Geschmack und zumindest nicht erhöhtem Kohlenmonoxidgehalt im Rauch erreichen. Mehrere Entwicklungsversuche in diese Richtung haben allerdings nur zum Teil Fortschritte gebracht.All in all, one would like to reach the sometimes contradictory goals of a high value for SE and a high value for FB with unchanged taste and at least not increased carbon monoxide content in the smoke. However, several attempts at development in this direction have made only partial progress.

Ein bekannter Ansatz, der auch kommerzielle Verbreitung gefunden hat, besteht darin, ein 6 mm breites Band in zwei Bänder mit je 3 mm zu teilen und 1 mm weit voneinander zu trennen. Man erzielt dadurch Verbesserungen bei FB, allerdings ist dabei die auf dem Zigarettenpapier durch die Bänder abgedeckte Fläche gleich groß wie bei dem normalen 6 mm breiten Band, sodass die in den Bändern aufgetragene Materialmenge zumindest nicht geringer wird, weshalb keine Vorteile bezüglich des Geschmacks oder des Kohlenmonoxidgehalts des Rauchs erwartet werden können.A known approach, which has also found commercial dissemination, is to divide a 6 mm wide band into two bands of 3 mm each and separate them 1 mm apart. This achieves improvements in FB, however, while the area covered by the tapes on the cigarette paper is the same size as in the normal 6 mm wide tape, so that the amount of material applied in the tapes is at least not lower, so there are no advantages in terms of taste or Carbon monoxide content of the smoke can be expected.

Wenig bewährt haben sich Varianten, bei denen die Bandkanten nicht gerade, sondern beispielsweise in Wellenform ausgeführt sind, um Verbesserungen des FB-Wertes zu erzielen. Dabei bringt man aber nennenswerte Mengen Material auf das Zigarettenpapier so auf, dass es nicht unmittelbar zur Selbstverlöschung beitragen kann. Man braucht also mehr Material oder mehr bedruckte Fläche, um die gesetzlichen Bestimmungen bezüglich Selbstverlöschung zu erfüllen. Dies kann negative Einflüsse auf den Geschmack und den Gehalt an Kohlenmonoxid im Rauch haben. Ähnliche Ansätze, bei denen die Bandkanten zwar gerade sind, aber die aufgetragene Materialmenge von der Mitte des Bandes zu den Bandkanten hin abnimmt, waren aus dem gleichen Grund nicht erfolgreich.Variants have proven to be unsuccessful in which the band edges are not straight but, for example, in the form of a waveform in order to achieve improvements in the FB value. However, considerable quantities of material are applied to the cigarette paper in such a way that it can not directly contribute to self-extinguishing. So you need more material or more printed area to meet the legal requirements for self-extinguishing. This can have negative effects on the taste and content of carbon monoxide in the smoke. Similar approaches where the band edges are straight but the amount of material applied decreases from the center of the band to the band edges were not successful for the same reason.

Es besteht also Bedarf, die oben dargestellten, sich teilweise widersprechenden Ziele noch besser miteinander vereinbar zu machen.There is therefore a need to make the above-mentioned, partially contradictory goals even better compatible.

ZUSAMMENFASSUNG DER ERFINDUNGSUMMARY OF THE INVENTION

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Zigarettenpapier bereit zu stellen, das einer daraus gefertigten Zigarette genügend hohe SE-Werte verleiht, um die gesetzlichen Vorschriften einzuhalten, jedoch auf dieser Zigarette gleichzeitig einen möglichst hohen FB-Wert, sowie einen reduzierten Kohlenmonoxidgehalt im Rauch bewirkt und den Geschmack möglichst wenig beeinträchtigt.The present invention has for its object to provide a cigarette paper that gives a cigarette made therefrom sufficiently high SE values to comply with the legal requirements, but on this cigarette at the same time the highest possible FB value, and a reduced carbon monoxide in the smoke causes and affects the taste as little as possible.

Diese Aufgabe wird durch ein Zigarettenpapier nach Anspruch 1 und ein Herstellungsverfahren nach Anspruch 16 gelöst. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.This object is achieved by a cigarette paper according to claim 1 and a manufacturing method according to claim 16. Advantageous developments are specified in the dependent claims.

Im Folgenden sollen die Begriffe "bedruckt", "bedruckte Fläche" oder ähnliche Ausdrücke in ihrer Bedeutung nicht darauf eingeschränkt sein, dass Material tatsächlich aufgedruckt wurde, sondern, dass Material nach jedem beliebigen Verfahren aufgetragen wurde, also beispielsweise auch durch Sprühen.In the following, the terms "printed", "printed area" or similar expressions should not be limited in their meaning to the fact that material was actually printed, but that material was applied by any method, so for example by spraying.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass das Zigarettenpapier Bänder umfasst, die so auf dem Zigarettenpapier aufgetragen sind, dass sie bei einer daraus fertigbaren Zigarette in Umfangsrichtung zum Liegen kommen können, d. h. im Wesentlichen in Querrichtung des Zigarettenpapiers, und auf die ein die Diffusionskapazität reduzierendes Material aufgetragen ist. Dabei umfasst ein Band zwei streifenförmige äußere Zonen und eine dazwischenliegende, streifenförmige mittlere Zone, die die folgenden Eigenschaften haben:

  • die äußeren Zonen des Bandes haben eine Breite von mindestens 0,4 mm und höchstens 1,0 mm, vorzugsweise höchstens 0,8 mm und besonders vorzugsweise höchstens 0,6 mm,
  • auf die äußeren Zonen des Bandes ist das genannte Material im Wesentlichen vollflächig aufgetragen,
  • die äußeren Zonen grenzen unmittelbar an die mittlere Zone an,
  • auf die äußeren Kanten der mittleren Zone ist das genannte Material nicht vollflächig aufgetragen,
  • das genannte Material ist auf mindestens 70%, vorzugsweise mindestens 75% und höchstens 95%, vorzugsweise höchstens 90% der Fläche der mittleren Zone aufgetragen,
  • die Fläche, auf die das genannte Material aufgetragen ist, ist wegzusammenhängend, und
  • die Fläche der mittleren Zone, auf die das genannte Material aufgetragen ist, ist wegzusammenhängend.
According to the invention, the object is achieved in that the cigarette paper comprises tapes which are applied to the cigarette paper so that they can come to rest in the peripheral direction of a cigarette manufacturable therefrom, ie substantially in the transverse direction of the cigarette paper, and on the one reducing the diffusion capacity Material is applied. In this case, a band comprises two strip-shaped outer zones and an intermediate, strip-shaped middle zone, which have the following properties:
  • the outer zones of the band have a width of at least 0.4 mm and at most 1.0 mm, preferably at most 0.8 mm and particularly preferably at most 0.6 mm,
  • on the outer zones of the belt said material is applied substantially over the entire surface,
  • the outer zones immediately adjoin the middle zone,
  • on the outer edges of the central zone said material is not applied over the entire surface,
  • said material is applied to at least 70%, preferably at least 75% and at most 95%, preferably at most 90%, of the area of the middle zone,
  • the area to which said material is applied is path-coherent, and
  • the area of the central zone to which said material is applied is path-coherent.

Die Erfinder haben festgestellt, dass sich bei dieser speziellen Bandform ein besserer Ausgleich der sich an sich widersprechenden Eigenschaften einer zuverlässigen Selbstverlöschung (hoher Wert für SE) einerseits und der Fähigkeit zum freien Glimmen (hoher Wert für FB), eines geringeren Materialauftrags und einer geringeren CO-Konzentration im Rauch andererseits besser vereinbaren lassen als bei den Bändern aus dem Stand der Technik. Genauer haben die Erfinder festgestellt, dass es für die Zwecke der Selbstverlöschung nicht notwendig ist, dass das Band aus einem vollflächig bedruckten Bereich besteht. Stattdessen genügt es, dass eine relativ schmale, im Wesentlichen vollflächig bedruckte äußere Zone das Glimmen der Zigarette ausreichend hemmen kann, es dann aber nicht unbedingt nötig ist, dass der in Glimmrichtung nachfolgende Bereich, d. h. die mittlere Zone, vollflächig bedruckt ist. Hierbei soll der Begriff "im Wesentlichen vollflächig aufgetragen" sowohl den bevorzugten Fall einschließen, dass tatsächlich 100 % der äußeren Zonen bedruckt sind, als auch Fälle, bei denen es aufgrund von prozessbedingten Schwankungen sehr kleine unbedruckte Flächen gibt.The inventors have found that in this particular belt form, a better balance of self-extinguishing characteristics (high value for SE) on the one hand and the ability to free glow (high value for FB), less material application and lower CO Concentration in the smoke, on the other hand, can be better reconciled than with the bands of the prior art. More specifically, the inventors have found that it is not necessary for the purposes of self-extinguishing that the tape consists of a full-surface printed area. Instead Suffice it that a relatively narrow, substantially full-surface printed outer zone can inhibit the glow of the cigarette sufficiently, but then it is not absolutely necessary that the glowing in the following area, ie the middle zone, is printed over the entire surface. Here, the term "applied substantially over the entire surface" is intended to include both the preferred case that actually 100% of the outer zones are printed, as well as cases where there are very small unprinted areas due to process-related fluctuations.

In der mittleren Zone kann der Materialauftrag demnach Aussparungen enthalten, solange drei Bedingungen erfüllt sind. Zum einen sollten mindestens 70%, vorzugsweise mindestens 75% der Fläche der mittleren Zone bedruckt sein, um eine zuverlässige Selbstverlöschung sicherzustellen. Des Weiteren soll die Fläche, auf die das Material aufgetragen ist, im topologischen Sinne wegzusammenhängend sein. Dies bedeutet, dass es zwischen zwei beliebigen Punkten der bedruckten Fläche eines Bandes immer einen stetigen Weg gibt, der die beiden Punkte verbindet und der ganz in der bedruckten Fläche verläuft. Einfach ausgedrückt dürfen die Aussparungen in der bedruckten Fläche die bedruckte Fläche nicht in mehrere getrennte Teile zerteilen. Zusätzlich muss noch verlangt werden, dass auch die mittlere Zone alleine wegzusammenhängend ist, dass es also zwischen zwei beliebigen Punkten der bedruckten Fläche der mittleren Zone eines Bandes immer einen stetigen Weg gibt, der die beiden Punkte verbindet und der ganz in der bedruckten Fläche der mittleren Zone verläuft. Untersuchungen der Erfinder haben ergeben, dass die Eigenschaft wegzusammenhängend zu sein ein wesentliches Kriterium dafür ist, dass die Selbstverlöschung sichergestellt ist, das neben dem flächenmäßigen Anteil des Materialauftrags in der mittleren Zone eigenständige Bedeutung hat. Die Bandkanten sind vorzugsweise gerade und parallel zueinander. Hiervon abweichende, beispielsweise wellige Bandkanten sind für die Zwecke der Erfindung weniger geeignet, sollen aber gleichwohl nicht aus dem Schutzbereich der Erfindung herausführen.In the middle zone, the material application can therefore contain recesses, as long as three conditions are met. First, at least 70%, preferably at least 75% of the area of the central zone should be printed to ensure reliable self extinguishment. Furthermore, the surface to which the material is applied should be path-coherent in the topological sense. This means that there is always a steady path between any two points on the printed surface of a band that connects the two dots and runs entirely in the printed area. Simply put, the recesses in the printed area must not divide the printed area into several separate parts. In addition, it must also be required that even the middle zone alone is path-coherent, that between two arbitrary points of the printed area of the middle zone of a band there is always a steady path connecting the two points and the whole in the printed area of the middle one Zone runs. Investigations by the inventors have shown that the property of being path-coherent is an essential criterion for ensuring the self-extinguishment, which has independent significance in addition to the areal proportion of the material application in the middle zone. The band edges are preferably straight and parallel to each other. Deviating from this, for example, wavy band edges are less suitable for the purposes of the invention, but nevertheless should not lead out of the scope of the invention.

Die "äußeren Kanten" der mittleren Zone, auf die oben Bezug genommen wurde, sind hierbei zwei gedachte, gerade und zu den Bandkanten parallele Linien, die angeben, an welcher Stelle des Bandes, von außen nach innen betrachtet, die Aussparungen in dem Materialauftrag beginnen. Während nämlich das Material in den äußeren Zonen im Wesentlichen vollflächig aufgetragen ist, wird die äußere Kante der mittleren Zone, oder mit anderen Worten die Grenze zwischen der mittleren Zone und der angrenzenden äußeren Zone durch die Linie definiert, auf der das genannte Material nicht vollflächig aufgetragen ist, sondern auf der eine der genannten Aussparungen beginnt.The "outer edges" of the central zone referred to above are here two imaginary lines, straight and parallel to the band edges, indicating at which point of the band, viewed from outside to inside, the recesses in the material application begin , Namely, while the material in the outer zones is applied substantially to the entire surface, the outer edge of the middle zone, or in other words the boundary between the central zone and the adjacent outer zone is defined by the line on which said material is not applied over the entire surface but on which one of the recesses mentioned begins.

Vorzugsweise haben die Bänder gewisse Symmetrieeigenschaften. Wie eingangs erwähnt sind die Bänder so auf dem Zigarettenpapier aufgetragen, dass sie bei einer daraus gefertigten Zigarette in Umfangsrichtung zum Liegen kommen, d. h. im Wesentlichen in Querrichtung des Papiers angeordnet also im Wesentlichen orthogonal zur Laufrichtung der Papierbahn durch die Papiermaschine. Jedoch weiß man zum Zeitpunkt der Papierproduktion noch nicht, in welcher Richtung das Papier auf der fertigen Zigarette abglimmen wird, sodass die Bänder in beiden Glimmrichtungen dieselben funktionalen Eigenschaften aufweisen sollten. Vorzugsweise besteht daher das Muster des Auftrages des Materials innerhalb eines Bandes aus zwei Hälften, die durch eine gedachte Mittellinie des Bandes getrennt sind, wobei das Auftragsmuster einer Bandhälfte durch Spiegelung an der Mittellinie oder Drehung um 180° um einen auf der Mittellinie liegenden Drehpunkt und eine optionale Parallelverschiebung parallel zur Mittellinie in das Auftragsmuster der anderen Bandhälfte überführt werden kann.Preferably, the bands have certain symmetry properties. As mentioned above, the bands are applied to the cigarette paper so that they come to rest in the circumferential direction in a cigarette made therefrom, d. H. essentially in the transverse direction of the paper, that is to say essentially orthogonal to the running direction of the paper web through the paper machine. However, at the time of paper production, one still does not know in which direction the paper will fade on the finished cigarette, so that the bands should have the same functional properties in both directions of glow. Preferably, therefore, the pattern of application of the material within a band consists of two halves separated by an imaginary centerline of the band, the order pattern of a band half being mirrored at the centerline or rotated 180 ° about a centerline pivot point and a centerline optional parallel shift parallel to the center line in the order pattern of the other half band can be transferred.

Vorzugsweise hat das Band eine Breite von mindestens 4 mm, besonders vorzugsweise von mindestens 5 mm. Das Band sollte jedoch eine Breite von 10 mm, vorzugsweise von 7 mm nicht überschreiten. Als besonders geeignet hat sich eine Breite von etwa 6 mm herausgestellt, die der im Gebiet üblichen Breite von derartigen Bändern entspricht, wobei jedoch aufgrund des nicht-vollständigen Materialauftrags in der mittleren Zone ein besserer FB-Wert, ein geringeren CO-Anteil im Rauch und insgesamt weniger Materialauftrag ermöglicht wird.Preferably, the tape has a width of at least 4 mm, more preferably at least 5 mm. However, the band should not exceed a width of 10 mm, preferably 7 mm. A width of about 6 mm has proven to be particularly suitable, which corresponds to the width of such bands usual in the field, but due to the incomplete application of material in the central zone a better FB value, a lower CO content in the smoke and Total less material is allowed.

In bevorzugten Ausführungsformen beträgt der Abstand zwischen den Bändern mindestens 5 mm, vorzugsweise mindestens 10 mm und besonders bevorzugt mindestens 15 mm. Gleichwohl sollte der Abstand höchstens 50 mm, vorzugsweise höchstens 30 mm und besonders vorzugsweise höchstens 25 mm betragen. Besonders bevorzugt wird der Abstand der Bänder so gewählt, dass sich mindestens zwei vollständige Bänder auf einer aus diesem Papier gefertigten Zigarette befinden. Ferner muss das Band eine ausreichend niedrige Diffusionskapazität besitzen, um die Selbstverlöschung nach ISO 12863 sicherzustellen. Hierzu hat das Band vorzugsweise eine Diffusionskapazität von höchstens 1,0 cm/s, vorzugsweise höchstens 0,8 cm/s und/oder von mindestens 0,01 cm/s, vorzugsweise von mindestens 0,1 cm/s. Diese Werte beziehen sich auf eine Messung nach einer Konditionierung des Papiers gemäß ISO 187 mit einem CO2 Diffusivity Meter der Firma Sodim, unter Verwendung eines Messkopfs mit einer Öffnung von 4 × 20 mm. Die Öffnung des Messkopfs soll sich dabei ganz auf dem Band befinden. Es versteht sich, dass dabei gleichzeitig Flächen mit und ohne Materialauftrag unter der Öffnung des Messkopfes liegen. Dies ist jedoch für die Prüfung des Messergebnisses gegen die angegebenen Grenzen nicht zu berücksichtigen.In preferred embodiments, the distance between the bands is at least 5 mm, preferably at least 10 mm, and more preferably at least 15 mm. However, the distance should be at most 50 mm, preferably at most 30 mm and more preferably at most 25 mm. Particularly preferably, the spacing of the bands is selected so that there are at least two complete bands on a cigarette made from this paper. Furthermore, the tape must have a sufficiently low diffusion capacity to ensure self-extinction according to ISO 12863. For this purpose, the band preferably has a diffusion capacity of at most 1.0 cm / s, preferably at most 0.8 cm / s and / or at least 0.01 cm / s, preferably at least 0.1 cm / s. These values refer to a measurement after conditioning of the paper according to ISO 187 with a CO 2 Diffusivity Meter from Sodim, using a measuring head with an opening of 4 × 20 mm. The opening of the measuring head should be completely on the belt. It goes without saying that at the same time surfaces with and lie without material application under the opening of the measuring head. However, this is not to be considered for the test of the measurement result against the specified limits.

Vorzugsweise beträgt die auf das Band aufgetragene Materialmenge, angegeben als Masse pro Auftragsfläche im getrockneten Zustand mindestens 1 g/m2, vorzugsweise mindestens 3 g/m2 und/oder höchstens 8 g/m2, vorzugsweise höchstens 6 g/m2. Mit derartigen Auftragsmengen lassen sich die gewünschten Eigenschaften in vorteilhafter Weise erzielen.The amount of material applied to the strip, expressed as mass per application surface in the dried state, is preferably at least 1 g / m 2 , preferably at least 3 g / m 2 and / or at most 8 g / m 2 , preferably at most 6 g / m 2 . With such order quantities, the desired properties can be achieved in an advantageous manner.

In einer bevorzugten Ausführungsform ist die Materialmenge pro bedruckter Fläche im Wesentlichen konstant. Dabei soll der Begriff "im Wesentlichen konstant" insbesondere bedeuten, dass sie um weniger als 10%, vorzugsweise um weniger als 5% variiert. Falls der Auftrag in einem Tiefdruckverfahren erfolgt, kann dies beispielsweise dadurch sichergestellt werden, dass sich die Volumina der Näpfchen des Tiefdruckzylinders um weniger als 10% vorzugsweise um weniger als 5% voneinander unterscheiden.In a preferred embodiment, the amount of material per printed area is substantially constant. In this case, the term "substantially constant" should in particular mean that it varies by less than 10%, preferably by less than 5%. If the application is carried out in a gravure printing process, this can be ensured, for example, by the fact that the volumes of the cells of the gravure cylinder differ by less than 10%, preferably by less than 5% from each other.

In einer vorteilhaften Ausführungsform umfasst das die Diffusionskapazität reduzierende Material ein Material, das aus einer Gruppe bestehend aus Stärke, Stärkederivaten, Zellulose, Zellulosederivaten und Alginaten oder einer Mischung daraus ausgewählt ist. Ferner kann das die Diffusionskapazität reduzierende Material einen Füllstoff enthalten, insbesondere ein Carbonat oder ein Oxid, vorzugsweise Kalk, Magnesiumoxid, Aluminiumhydroxid oder eine Mischung daraus. Zusätzlich oder alternativ kann das die Diffusionskapazität reduzierende Material auch ein Brandsalz enthalten, wobei insbesondere Trinatriumzitrat oder Trikaliumzitrat oder eine Mischung daraus geeignet sind.In an advantageous embodiment, the diffusion capacity reducing material comprises a material selected from the group consisting of starch, starch derivatives, cellulose, cellulose derivatives and alginates, or a mixture thereof. Further, the diffusion capacity reducing material may contain a filler, in particular a carbonate or an oxide, preferably lime, magnesium oxide, aluminum hydroxide or a mixture thereof. Additionally or alternatively, the diffusion capacity reducing material may also contain a fire salt, in particular trisodium citrate or tripotassium citrate or a mixture thereof being suitable.

Die Erfindung ist auf allen bekannten Zigarettenpapieren anwendbar, auch unabhängig davon ob das Papier für maschinengefertigte oder handgefertigte Zigaretten gedacht ist.The invention is applicable to all known cigarette papers, also irrespective of whether the paper is intended for machine-made or handmade cigarettes.

In einer bevorzugten Ausführungsform hat das unbehandelte Zigarettenpapier eine Luftdurchlässigkeit nach ISO 2965, die zwischen 5CU und 300 CU, vorzugsweise zwischen 10 CU und 200 CU beträgt. Dabei hat das unbehandelte Zigarettenpapier zusätzlich oder alternativ ein Flächengewicht von zwischen 10 g/m2 und 60 g/m2, vorzugsweise von zwischen 20 g/m2 und 40 g/m2. Das Zigarettenpapier kann Holzzellstoff, Zellstoff von Einjahrespflanzen, insbesondere Flachs oder Hanf, oder andere Faserstoffe wie beispielsweise Sisal oder Jute, oder ein Gemisch daraus umfassen.In a preferred embodiment, the untreated cigarette paper has an air permeability according to ISO 2965, which is between 5CU and 300 CU, preferably between 10 CU and 200 CU. The untreated cigarette paper additionally or alternatively has a basis weight of between 10 g / m 2 and 60 g / m 2 , preferably between 20 g / m 2 and 40 g / m 2 . The cigarette paper may comprise wood pulp, pulp of annual plants, especially flax or hemp, or other fibrous materials such as sisal or jute, or a mixture thereof.

Ferner kann das unbehandelte Zigarettenpapier einen Füllstoff enthalten, dessen Anteil bezogen auf die gesamte Papiermasse mindestens 10 Gew.-%, vorzugsweise mindestens 15 Gew.- % und/oder höchstens 45 Gew.-%, vorzugsweise höchstens 40 Gew.-% beträgt. Dabei kann der Füllstoff insbesondere durch ein Carbonat oder ein Oxid, vorzugsweise durch gefällten Kalk, Magnesiumoxid, Aluminiumhydroxid oder Gemische daraus gebildet sein. Ferner enthält das Zigarettenpapier vorzugsweise ein Brandsalz, insbesondere Trinatriumzitrat, Trikaliumzitrat oder ein Gemisch daraus. Dabei beträgt der Anteil des Brandsalzes bezogen auf die Masse des unbehandelten Zigarettenpapiers vorzugsweise höchstens 5 Gew.-% und besonders bevorzugt zwischen 0,5 Gew.-% und 3,0 Gew.-%.Furthermore, the untreated cigarette paper may contain a filler whose proportion based on the total paper mass is at least 10% by weight, preferably at least 15% by weight and / or at most 45% by weight, preferably at most 40% by weight. In this case, the filler may be formed in particular by a carbonate or an oxide, preferably by precipitated lime, magnesium oxide, aluminum hydroxide or mixtures thereof. Furthermore, the cigarette paper preferably contains a fire salt, in particular trisodium citrate, tripotassium citrate or a mixture thereof. In this case, the proportion of the Brandsalzes based on the mass of the untreated cigarette paper is preferably at most 5 wt .-% and particularly preferably between 0.5 wt .-% and 3.0 wt .-%.

Ebenso kann das Zigarettenpapier auf seiner gesamten oder auf Teilen seiner Fläche mit Zusammensetzungen beschichtet sein, die beispielsweise Aromastoffe enthalten oder die Inhaltsstoffe des Rauchs, insbesondere die sogenannten Hoffmann Analyten, beeinflussen, sofern diese Zusammensetzungen nicht wesentlich zur Selbstverlöschung einer aus diesem Papier gefertigten Zigarette beitragen. Solche Beschichtungen können, sofern vorhanden, auf einer der beiden Seiten des Papiers oder auf beiden Seiten aufgetragen sein und sie können vor oder nach dem Auftrag der erfindungsgemäßen Bänder aufgebracht werden.Likewise, the cigarette paper may be coated on its entire or parts of its surface with compositions containing, for example, flavorings or the ingredients of the smoke, in particular the so-called Hoffmann analytes, unless these compositions contribute significantly to the self-extinction of a cigarette made from this paper. Such coatings, if present, may be applied on either side of the paper or on both sides and may be applied before or after the application of the tapes of the invention.

Die Erfindung betrifft ferner ein Verfahren zum Herstellen eines Zigarettenpapiers nach einer der obengenannten Ausführungsformen. Vorzugsweise wird dabei das genannte Material in Form einer Zusammensetzung, insbesondere einer Lösung, einer Emulsion oder einer Suspension aufgetragen, die ein Lösungsmittel und das genannte Material enthält. Hierbei ist der Begriff "Lösungsmittel" breit zu verstehen und soll insbesondere nicht suggerieren, dass die Zusammensetzung tatsächlich eine "Lösung" im chemischen Sinne ist, stattdessen sind wie gesagt auch Suspensionen als geeignete und bevorzugte Zusammensetzungen denkbar.The invention further relates to a method for producing a cigarette paper according to one of the abovementioned embodiments. Preferably, said material is applied in the form of a composition, in particular a solution, an emulsion or a suspension which contains a solvent and said material. In this case, the term "solvent" is to be understood broadly and should in particular not suggest that the composition is actually a "solution" in the chemical sense, instead, as said, suspensions are also conceivable as suitable and preferred compositions.

Vorzugsweise handelt es sich bei dem Lösungsmittel um Wasser, weil es toxikologisch unbedenklich ist. Zwar können grundsätzlich auch organische Lösungsmittel eingesetzt werden, von denen jedoch auch nach dem Trocknen des Papiers stets Reste im Papier verbleiben, was den Geruch des Papiers beeinträchtigen kann. Der Geruch solcher Reste von organischen Lösungsmitteln wird insbesondere beim erstmaligen Öffnen einer Zigarettenpackung vom Raucher bisweilen als störend empfunden.Preferably, the solvent is water because it is toxicologically safe. Although in principle organic solvents can also be used, of which, however, even after the paper has dried, residues always remain in the paper, which can impair the odor of the paper. The odor of such residues of organic solvents is sometimes found annoying by the smoker when the cigarette pack is opened for the first time.

Das Material, das nach dem Trocknen auf dem Papier verbleibt, muss geeignet sein, die Poren des Zigarettenpapiers durch Bildung eines Films an der Oberfläche des Papiers oder durch Eindringen in die Poren zu verschließen, um so die Diffusionskapazität des Papiers in den bedruckten Flächen zu reduzieren. Für diese Zwecke sind die obengenannten Materialien Stärke und Stärkederivate, Zellulose und Zellulosederivate sowie Alginate oder eine Mischung daraus besonders geeignet. Bei einer oxidativ abgebauten, absolut trockenen Stärke beträgt der Anteil 5 Gew.-% bis 30 Gew.-%, bevorzugt 10 Gew.-% bis 25 Gew.-% bezogen auf die Zusammensetzung. In vielen Fällen wird man den Anteil des auf dem Papier verbleibenden Materials an der Zusammensetzung anhand der Viskosität wählen, die das Auftragsverfahren erfordert.The material that remains on the paper after drying must be capable of occluding the pores of the cigarette paper by forming a film on the surface of the paper or by penetrating the pores so as to reduce the diffusion capacity of the paper in the printed areas , Starch and starch derivatives, cellulose and cellulose derivatives and alginates or a mixture thereof are particularly suitable for these purposes. In an oxidatively degraded, completely dry starch, the proportion is 5 wt .-% to 30 wt .-%, preferably 10 wt .-% to 25 wt .-% based on the composition. In many cases, one will choose the proportion of material remaining on the paper in the composition based on the viscosity required by the application process.

Vorzugsweise wird die genannte Zusammensetzung in einem Druckverfahren aufgetragen, insbesondere im Tiefdruck oder im Flexodruck, die einfach und stabil im industriellen Maßstab ausgeführt werden können. Ein Auftrag beispielsweise durch Sprühen ist aber ebenfalls möglich.Preferably, said composition is applied in a printing process, in particular gravure printing or flexographic printing, which can be carried out easily and stably on an industrial scale. An order, for example, by spraying is also possible.

Der Auftrag erfolgt dabei vorzugsweise auf jene Seite des Zigarettenpapiers, die auf einer daraus gefertigten Zigarette dem Tabak, also der Innenseite, zugewandt ist. Üblicherweise ist dies die Siebseite, da sie einen niedrigeren Kalkgehalt im Vergleich zur Oberseite aufweist, was sich positiv auf das optische Erscheinungsbild der Tabakasche auswirkt. Ein Auftrag auf die für den Druck an sich besser geeignete Oberseite ist problemlos möglich, aber nicht bevorzugt.The order is preferably carried out on that side of the cigarette paper, which faces the tobacco, so the inside, on a cigarette made therefrom. Usually, this is the screen side, as it has a lower lime content compared to the top, which has a positive effect on the visual appearance of the tobacco ashes. An order on the better for the pressure itself suitable top is easily possible, but not preferred.

Obwohl ein Auftrag des Materials in mehreren Schichten, mit dem üblichen Trocknungsvorgang nach dem Auftrag einer jeden Schicht möglich ist, besteht die bevorzugte Ausführung darin, das gesamte Material in einer Schicht aufzutragen. Damit erspart man sich die Notwendigkeit, die einzelnen Schichten eines Bandes genau übereinander zu positionieren. Dies ist schwierig, weil die Bänder an sich auf der Zigarette nicht sichtbar sein sollen und daher mit üblicher Sensorik kaum detektiert werden können. Dies hat in der Praxis zur Folge, dass die Kanten der einzelnen Druckschichten nicht präzise übereinander liegen, sodass es zu einer graduellen Abnahme der aufgetragenen Materialmenge beim Übergang von den bedruckten zu den unbedruckten Flächen kommt, was nicht erwünscht ist.Although it is possible to coat the material in multiple layers with the usual drying process after the application of each layer, the preferred embodiment is to apply all the material in one layer. This avoids the need to precisely position the individual layers of a tape one above the other. This is difficult because the bands per se on the cigarette should not be visible and therefore can hardly be detected with conventional sensors. In practice this has the consequence that the edges of the individual printed layers are not precisely superimposed, so that there is a gradual decrease in the amount of material applied during the transition from the printed to the unprinted areas, which is undesirable.

Da es beim Auftrag großer Mengen einer wasserbasierten Zusammensetzung auf das Papier nach dem Trocknen zu einer Faltenbildung kommen kann, kann die Zusammensetzung auch Substanzen enthalten, die diese Faltenbildung reduzieren, wie beispielsweise Propylenglykol oder Glycerin. Andere Substanzen, wie beispielsweise Farbstoffe oder Aromastoffe, können ebenfalls in der Zusammensetzung enthalten sein, sofern sie die Selbstverlöschung der aus diesem Papier gefertigten Zigarette nicht erheblich negativ beeinflussen. Grundsätzlich sind bei der Auswahl aller Substanzen und Materialien gesetzliche und toxikologische Aspekte zu berücksichtigen.Since the application of large amounts of a water-based composition to the paper may result in wrinkling after drying, the composition may also contain substances that reduce wrinkling, such as propylene glycol or glycerin. Other substances, such as dyes or flavorings, may also be included in the composition, provided that they do not significantly negatively impact the self-extinction of the cigarette made from this paper. In principle, legal and toxicological aspects must be taken into account when selecting all substances and materials.

In einer vorteilhaften Ausführungsform wird das Papier zur Entfernung oder Reduktion von Falten nachbehandelt. Vorzugsweise wird das Papier nach Auftrag der Zusammensetzung und nach einem ersten Trocknungsvorgang nachbefeuchtet und einem weiteren Trocknungsvorgang unterzogen, vorzugsweise unter mechanischer Belastung, beispielsweise Strecken oder Dehnen der Papierbahn. Dieser "mechanische" Prozess zur Entfernung von Falten ist insofern vorteilhaft, da er den Einsatz zusätzlicher Substanzen in der Zusammensetzung überflüssig machen kann.In an advantageous embodiment, the paper is aftertreated to remove or reduce wrinkles. Preferably, after application of the composition and after a first drying process, the paper is subsequently moistened and subjected to a further drying process, preferably under mechanical stress, for example stretching or stretching of the paper web. This "mechanical" wrinkle removal process is advantageous in that it can eliminate the need for additional substances in the composition.

KURZBESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Fig. 1Fig. 1
zeigt eine Tabelle mit den Ergebnissen aus den Versuchen mit den Druckmustern der Fig. 2-9 und einem vollflächigen Band mit 6 mm Breite als Vergleichsmuster.shows a table with the results from the experiments with the print samples of Fig. 2-9 and a full-width tape with 6 mm width as a comparison pattern.
Fig. 2Fig. 2
zeigt ein erfindungsgemäßes Druckmuster, alle Maße sind in Millimetern.shows a printing pattern according to the invention, all dimensions are in millimeters.
Fig. 3Fig. 3
zeigt ein erfindungsgemäßes Druckmuster und zeigt zusätzlich die Aufteilung eines Bands in die äußeren und die mittlere Zone. Alle Maße sind in Millimetern.shows a printing pattern according to the invention and additionally shows the division of a band in the outer and the middle zone. All dimensions are in millimeters.
Fig. 4 - 6Fig. 4-6
zeigen erfindungsgemäße Druckmuster, alle Maße sind in Millimetern.show printing patterns according to the invention, all dimensions are in millimeters.
Fig. 7 - 10Fig. 7 - 10
zeigen nicht erfindungsgemäße Druckmuster, alle Maße sind in Millimetern.show not according to the invention printing pattern, all dimensions are in millimeters.
AUSFÜHRUNGSBEISPIELEEMBODIMENTS

Zum besseren Verständnis der vorliegenden Erfindung wird im Folgenden auf die in den Zeichnungen dargestellten bevorzugten Ausführungsbeispiele Bezug genommen, die anhand spezifischer Terminologie beschrieben sind. Es sei jedoch darauf hingewiesen, dass der Schutzumfang der Erfindung dadurch nicht eingeschränkt werden soll, da derartige Veränderungen und weitere Modifizierungen an dem gezeigten Zigarettenpapier und dem Herstellungsverfahren sowie derartige weitere Anwendungen der Erfindung, wie sie darin aufgezeigt sind, als übliches derzeitiges oder künftiges Fachwissen eines zuständigen Fachmanns angesehen werden.For a better understanding of the present invention, reference will be made below to the preferred embodiments illustrated in the drawings which are given by way of example specific terminology are described. It should be understood, however, that the scope of the invention should not be so limited since such changes and other modifications to the illustrated cigarette paper and method of manufacture, as well as such other uses of the invention as set forth herein, are to be considered as current or future knowledge of the art competent expert.

Am Beispiel des in Figur 3 gezeigten Druckmusters soll die Einteilung eines Bandes 10 in Zonen erläutert werden. Das Band 10 verläuft auf dem Papier in Querrichtung, die durch einen Pfeil 12angezeigt ist und durch zwei Bandkanten 14a und 14b vom unbehandelten Zigarettenpapier (nicht gezeigt) abgegrenzt ist. Die gedachten, geraden, parallelen und in Querrichtung verlaufenden Linien 16a und 16b trennen äußere Zonen 18a und 18b von einer mittleren Zone 20. Die eine äußere Zone 18a befindet sich also zwischen der Bandkante 14a und der gedachten Linie 16a und die andere äußere Zone 18b befindet sich zwischen der Bandkante 14b und der gedachten Linie 16b. Die mittlere Zone 20 ist durch die beiden gedachten Linien 16a und 16b begrenzt.Using the example of in FIG. 3 shown printing pattern is to be explained the division of a belt 10 in zones. The belt 10 runs on the paper in the transverse direction, indicated by an arrow 12 and delimited by two belt edges 14a and 14b from the untreated cigarette paper (not shown). The imaginary, straight, parallel and transverse lines 16a and 16b separate outer zones 18a and 18b from a central zone 20. The one outer zone 18a is thus located between the band edge 14a and the imaginary line 16a and the other outer zone 18b between the band edge 14b and the imaginary line 16b. The middle zone 20 is bounded by the two imaginary lines 16a and 16b.

Die äußeren Zonen 18a und 18b sind im Wesentlichen vollflächig bedruckt, während die Linien 16a und 16b selbst nicht entlang ihrer gesamten Länge bedruckt sind. Ebenso ist die mittlere Zone 20 nicht vollflächig bedruckt. Der bedruckte Bereich bzw. die Auftragsfläche 22 ist in Fig. 3 im linken Teil der Figur durch Schraffur angedeutet und wird durch Aussparungen 24 ohne Materialauftrag durchbrochen. In diesem Sinne ist die mittlere Zone 20 nicht "vollflächig bedruckt". Die Fläche 22, auf die das Material aufgetragen ist, ist jedoch im topologischen Sinne wegzusammenhängend. Dies bedeutet, dass es zwischen zwei beliebigen Punkten der bedruckten Fläche bzw. Auftragsfläche 22 des Bandes 10 einen stetigen Weg gibt, der vollständig innerhalb der bedruckten Fläche 22 verläuft. Ebenso ist in diesem Sinn die bedruckte Fläche der mittleren Zone 20 wegzusammenhängend.The outer zones 18a and 18b are substantially printed over the entire surface, while the lines 16a and 16b themselves are not printed along their entire length. Likewise, the middle zone 20 is not printed over the entire surface. The printed area or the application area 22 is in Fig. 3 indicated by hatching in the left part of the figure and is broken through recesses 24 without material. In this sense, the middle zone 20 is not "printed over the entire surface". The surface 22 to which the material is applied, however, is path-coherent in the topological sense. This means that between any two points of the printed area or application surface 22 of the band 10 there is a continuous path that extends completely within the printed area 22. Likewise, in this sense, the printed area of the middle zone 20 is path-coherent.

Das Band 10 von Fig. 3 ist spiegelsymmetrisch bezüglich einer Mittellinie 26, die sich in Längsrichtung des Bandes 10 erstreckt. Dies bedeutet, dass das Band 10 unabhängig von der Glimmrichtung dasselbe Verhalten bezüglich der Selbstverlöschung aufweist. Daher braucht man sich bei der Herstellung des Zigarettenpapiers noch nicht darauf festlegen, in welcher Richtung es bei der daraus gefertigten Zigarette abglimmen wird. Eine für diese Zwecke ebenfalls geeignete Symmetrie ist eine Rotationssymmetrie um einen Drehpunkt, der auf der Mittellinie 26 liegt. Dies ist beispielsweise bei dem Band von Fig. 2 der Fall. Im Band von Fig. 6 gehen die beiden Bandhälften oberhalb und unterhalb der Mittellinie (in Fig. 6 nicht gezeigt) durch eine Spiegelung an der Mittellinie in Kombination mit einer Parallelverschiebung entlang der Mittellinie auseinander hervor, was ebenfalls eine geeignete Symmetrie ist, um ein glimmrichtungsunabhängiges Verhalten hervorzurufen.The band 10 of Fig. 3 is mirror-symmetrical with respect to a center line 26 which extends in the longitudinal direction of the belt 10. This means that the tape 10 has the same self-extinguishing behavior regardless of the glow direction. Therefore, it is not necessary in the preparation of the cigarette paper to decide on which direction it will smolder in the cigarette made therefrom. A likewise suitable for this purpose symmetry is a rotational symmetry about a pivot point, which on the Centerline 26 is located. This is for example in the band of Fig. 2 the case. In the volume of Fig. 6 go the two band halves above and below the midline (in Fig. 6 not shown) by a reflection at the centerline in combination with a parallel translation along the centerline apart, which is also a suitable symmetry to evoke glow direction independent behavior.

Als Zigarettenpapier wurde ein handelsübliches Zigarettenpapier aus Holzzellstoff und gefälltem Kalk als Füllstoff mit einem Flächengewicht von 24 g/m2, einem Füllstoffanteil von 33 Gew.-% und einer Luftdurchlässigkeit von 75 CU verwendet. Das Zigarettenpapier enthielt außerdem 1 Gew.-% Trikaliumzitrat als Brandsalz.As the cigarette paper, a commercial cigarette paper of wood pulp and precipitated lime as a filler having a basis weight of 24 g / m 2 , a filler content of 33% by weight and an air permeability of 75 CU was used. The cigarette paper also contained 1% by weight of tripotassium citrate as the fire salt.

Auf dieses Zigarettenpapier wurden im Tiefdruckverfahren jeweils Bänder mit den Druckmustern aus den Figuren 2-9 aufgetragen. Die aufgetragene Zusammensetzung bestand aus Wasser, 15,5 Gew.-% absolut trockener oxidativ abgebauter Stärke und 9,5 Gew.-% Kalk. Zum Vergleich wurde auch ein vollflächig bedrucktes, 6 mm breites Band auf das Papier aufgetragen. Der Bandabstand betrug in allen Fällen 18 mm.On this cigarette paper were each gravure printing tapes with the print patterns from the Figures 2-9 applied. The applied composition consisted of water, 15.5% by weight of absolutely dry oxidatively degraded starch and 9.5% by weight of lime. For comparison, a full-surface printed, 6 mm wide tape was applied to the paper. The band gap was 18 mm in all cases.

Die Diffusionskapazität der Bänder wurde, nach einer Konditionierung des Papiers gemäß ISO 187, mit einem CO2 Diffusivity Meter der Firma Sodim gemessen. Der Messkopf hatte eine Öffnung von 4×20 mm und wurde so positioniert, dass sich die gesamte Öffnung innerhalb des Bandes befand. Die Diffusionskapazität aller Druckmuster lag zwischen 0,09 cm/s und 0,60 cm/s.The diffusion capacity of the tapes was measured after conditioning the paper according to ISO 187 with a CO 2 diffusivity meter from Sodim. The probe had an aperture of 4 × 20 mm and was positioned so that the entire opening was within the band. The diffusion capacity of all print samples was between 0.09 cm / s and 0.60 cm / s.

Aus den Zigarettenpapieren wurden Zigaretten mit einer American Blend Tabakmischung gefertigt und 40 Stück gemäß ISO 12863 auf ihre Selbstverlöschung getestet und der Wert für SE bestimmt. Ebenso wurden 40 Stück hinsichtlich ihres Wertes für FB getestet. Dabei wurde die Zigarette zunächst gemäß ISO 3402 konditioniert, dann angezündet und glimmend in eine Halterung in horizontaler Lage gesteckt, d.h. mit der Längsachse der Zigarette orthogonal zur Richtung der Schwerkraft, sodass von allen Seiten die Luft frei zur glimmenden Zigarette strömen konnte. Dabei wurde die Zigarette soweit von Luftbewegungen abgeschirmt, dass der Gastransport nur durch freie Konvektion erfolgte. Die Zahl der Zigaretten, bei denen der gesamte Tabakstrang abglimmte, ohne dass die Zigarette von selbst verlöschte, wurde ermittelt und als Prozentsatz, bezogen auf die Zahl der getesteten Zigaretten angegeben (FB).From the cigarette papers cigarettes were made with an American blend tobacco blend and tested 40 pieces according to ISO 12863 on their self extinguishing and determines the value for SE. Likewise, 40 pieces were tested for their value for FB. The cigarette was first conditioned in accordance with ISO 3402, then lit and smoldering in a holder in a horizontal position, ie with the longitudinal axis of the cigarette orthogonal to the direction of gravity, so that the air could flow freely from all sides to the smoldering cigarette. The cigarette was so far shielded from air movements that the gas was transported only by free convection. The number of cigarettes smoked on the entire tobacco rod without the cigarette extinguishing itself was determined and expressed as a percentage based on the number of cigarettes tested (FB).

Die Zigaretten wurden nach einem in ISO 4387 spezifizierten Verfahren maschinell abgeraucht, und aus der gesammelten Gasphase wurde der Gehalt an Kohlenmonoxid bestimmt.The cigarettes were machine smoked according to a method specified in ISO 4387, and the content of carbon monoxide was determined from the collected gas phase.

Die Ergebnisse für SE und FB sowie der Gehalt an Kohlenmonoxid (CO) sind in der in Fig. 1 dargestellten Tabelle aufgelistet. Dort ist auch für jedes der Druckmuster aus den Figuren 2-9 der in der mittleren Zone 20 liegende Anteil der bedruckten Fläche 22 in Prozent bezogen auf die gesamte Fläche der mittleren Zone 20 angegeben.The results for SE and FB as well as the content of carbon monoxide (CO) are in the in Fig. 1 listed table. There is also for each of the print patterns from the Figures 2-9 the proportion of the printed area 22 lying in the middle zone 20 is given in percent relative to the entire area of the middle zone 20.

Man erkennt aus der Tabelle von Figur 1, dass mit fallendem Anteil der bedruckten Fläche 22 in der mittleren Zone 20 der Wert für SE abnimmt und jener für FB zunimmt. Das Druckmuster von Figur 2 hat einen SE Wert von 100%, allerdings ist der Wert für FB mit 30% recht niedrig. Da der Wert aber deutlich höher als jener für das 6 mm breite, vollflächige Band ist, kann auch das Druckmuster von Figur 2 noch als erfindungsgemäß gelten. Eine kleine Erhöhung der Diffusionskapazität kann dabei den Wert für FB noch steigern, ohne die ausreichende Selbstverlöschung zu gefährden.One recognizes from the table of FIG. 1 in that, as the proportion of the printed area 22 in the middle zone 20 decreases, the value for SE decreases and that for FB increases. The print pattern of FIG. 2 has a SE value of 100%, but the value for FB is quite low at 30%. But since the value is significantly higher than that for the 6 mm wide, full-surface band, the print pattern of FIG. 2 still considered to be according to the invention. A small increase in the diffusion capacity can still increase the value for FB, without endangering the sufficient self-extinction.

Die Druckmuster der Figuren 3 - 5 gehören zu den bevorzugten Ausführungen, da bei allen diesen Druckmustern sowohl der Wert für SE als auch jener für FB sehr hoch sind.The print patterns of Figures 3 - 5 are among the preferred embodiments because for all these print patterns, both the value for SE and that for FB are very high.

Das Druckmuster von Figur 6 zeigt sehr gute Werte für FB, allerdings ist der Wert für SE mit 70% knapp unter den üblichen gesetzlichen Vorgaben von 75%. Hier kann der Wert für SE durch eine leichte Reduktion der Diffusionskapazität noch gesteigert werden, ohne jenen für FB zu stark zu senken.The print pattern of FIG. 6 shows very good values for FB, but the value for SE at 70% is just below the usual legal requirements of 75%. Here, the value for SE can be further increased by a slight reduction of the diffusion capacity, without lowering too much for FB.

Das Druckmuster von Figur 7 ist nicht erfindungsgemäß, weil der Wert für SE nicht mehr ausreichend hoch ist. Dieses Muster zeigt, dass trotz eines hohen Anteils der bedruckten Fläche in der mittleren Zone 20 von 84,16% eine ausreichende Selbstverlöschung nicht sichergestellt ist. Bei diesem Druckmuster ist weder die gesamte bedruckte Fläche 22 noch die bedruckte Fläche der mittleren Zone 20 wegzusammenhängend, sondern es zerfällt in zwei Teile, die beide nicht ausreichend stark zusammenwirken, um die Selbstverlöschung sicherzustellen. Beim Test auf Selbstverlöschung zeigt sich, dass die Zigarette entlang der unbedruckten Bereiche quer durch das Band 10 weiterglimmen kann und so das Band überwindet.The print pattern of FIG. 7 is not according to the invention because the value for SE is no longer sufficiently high. This pattern shows that despite a high proportion of the printed area in the central zone 20 of 84.16%, sufficient self-extinguishing is not ensured. In this print pattern, neither the entire printed area 22 nor the printed area of the central zone 20 is path-coherent, but it is split into two parts, both of which do not co-operate sufficiently to ensure self-extinction. The self-extinguishing test shows that the cigarette can continue to glaze along the unprinted areas across the belt 10, thus overcoming the belt.

Auch das Druckmuster von Figur 8 ist nicht wegzusammenhängend und damit nicht erfindungsgemäß, sondern zerfällt in drei Teile. Auch hier zeigt sich, dass die Rate für die Selbstverlöschung (SE) mit 60% zu niedrig ist.Also the print pattern of FIG. 8 is not wegzusammenhängend and therefore not according to the invention, but falls into three parts. Here, too, the self-extinguishing (SE) rate is 60% too low.

Ebenso zeigt das Druckmuster von Figur 9 mit einem Anteil von 67,84% bedruckter Fläche 22 in der mittleren Zone 20 eine deutlich zu niedrige Rate für die Selbstverlöschung. Auch dieses Muster ist nicht erfindungsgemäß, da der Anteil der bedruckten Fläche in der mittleren Zone zu gering ist und die mittlere Zone außerdem nicht wegzusammenhängend ist, sodass die Zigarette entlang der unbedruckten Kanäle im Band weiterglimmen kann.Similarly, the print pattern of FIG. 9 with a share of 67.84% printed area 22 in the middle zone 20, a far too low rate for self extinguishment. Again, this pattern is not in accordance with the present invention because the proportion of printed area in the middle zone is too low and, moreover, the central area is not path-coherent so that the cigarette may continue to glow along the unprinted channels in the belt.

Auch das Druckmuster von Figur 10 ist nicht erfindungsgemäß. Dieses Muster wurde nicht getestet, weil kein wesentlich anderes Verhalten als beim ebenfalls nicht erfindungsgemäßen Druckmuster von Figur 7 zu erwarten ist. Im Druckmuster von Figur 10 ist aber die bedruckte Fläche 22 wegzusammenhängend, während die bedruckte Fläche der mittleren Zone 20 nicht wegzusammenhängend ist. Das zeigt, dass diese beiden Eigenschaften unabhängig voneinander von Bedeutung sind.Also the print pattern of FIG. 10 is not according to the invention. This pattern has not been tested because no behavior substantially different from the likewise not according to the invention printing pattern of FIG. 7 is to be expected. In the print pattern of FIG. 10 but the printed area 22 is path-coherent while the printed area of the middle zone 20 is not path-coherent. This shows that these two properties are independent of each other.

Anhand der Werte für Kohlenmonoxid kann man erkennen, dass alle Druckmuster der Figuren 2-9 niedrigere Werte ergeben als ein 6 mm breites, vollflächig bedrucktes Band. Somit zeigt sich hier eine Verbesserung gegenüber den aus dem Stand der Technik bekannten Bändern.Based on the values for carbon monoxide, it can be seen that all print patterns of the Figures 2-9 lower values result than a 6 mm wide, fully printed ribbon. Thus, it shows an improvement over the known from the prior art tapes.

Zusätzlich sind bei den Druckmustern der Figuren 2-9 nur 67,84 % bis 92,80 % der Fläche der mittleren Zone 20 bedruckt. Dies bedeutet im Vergleich zu einem vollflächigen, 6 mm breiten Band eine Einsparung von etwa 7% bis etwa 23% des Materials und damit einen geringeren Einfluss auf den Geschmack der Zigarette.In addition, the printing patterns of the Figures 2-9 only 67.84% to 92.80% of the area of the middle zone 20 printed. This means a savings of about 7% to about 23% of the material compared to a full-surface, 6 mm wide band and thus a smaller impact on the taste of the cigarette.

Neben diesen Vorteilen lassen sich die erfindungsgemäßen Muster auch noch effizient in einem einschichtigen Auftrag drucken, sodass auf die im Stand der Technik vorgeschlagene Variation der Auftragsmenge innerhalb der bedruckten Fläche verzichtet werden kann.In addition to these advantages, the patterns according to the invention can also be printed efficiently in a single-layer application, so that it is possible to dispense with the variation of the application quantity within the printed surface as proposed in the prior art.

Insgesamt scheint es entgegen der Erwartung nicht notwendig zu sein, dass das Band aus einem mehrere Millimeter breiten vollflächig bedruckten Bereich besteht, sondern es genügt, dass eine relativ schmale im Wesentlichen vollflächig bedruckte äußere Zone das Glimmen der Zigarette ausreichend hemmen kann, sodass die darauf folgenden Bereiche des Bands nicht vollflächig bedruckt sein müssen. Tatsächlich beobachtet man im Fall der Selbstverlöschung, dass der Glutkegel gar nicht bis unter das Band weiterglimmt sondern bereits ganz am Beginn des Bands verlöscht. Andererseits darf man dem Glutkegel hinter der schmalen, im Wesentlichen vollflächig bedruckten Zone keine zu großen unbedruckten Flächen und insbesondere keine in Längsrichtung der Zigarette verlaufenden unbedruckten Kanäle bieten, da entlang dieser Flächen und Kanäle der Glutkegel durch das Band glimmen kann.Overall, contrary to expectation, it does not appear necessary for the tape to consist of a full-width printed area several millimeters wide, but it is sufficient for a relatively narrow outer zone, printed over the entire area, to glow Cigarette can inhibit enough, so that the subsequent areas of the tape must not be printed over the entire surface. In fact, in the case of self extinguishing, it is observed that the glow cone does not continue to glow below the band but already extinguishes at the very beginning of the band. On the other hand, one must not offer the glaze cone behind the narrow, essentially completely printed zone zones that are too large unprinted areas and, in particular, no unprinted channels extending in the longitudinal direction of the cigarette, since the glaze cone may glow along the areas along these channels.

Die erfindungsgemäßen Druckmuster sind insgesamt so geartet, dass Material im Wesentlichen nur dort auf das Zigarettenpapier aufgetragen ist, wo es unmittelbar zur Selbstverlöschung beiträgt. Auf diese Weise lässt sich die aufgetragene Menge an Material minimieren und man erreicht eine Reduktion des Gehalts an Kohlenmonoxid im Rauch und eine Minimierung des Geschmackseinflusses.Overall, the printing patterns according to the invention are of such a nature that material is essentially only applied to the cigarette paper where it contributes directly to self-extinguishment. In this way, the applied amount of material can be minimized and one achieves a reduction of the content of carbon monoxide in the smoke and a minimization of the taste influence.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Bandtape
1212
Querrichtungtransversely
14a, 14b14a, 14b
Bandkantenstrip edges
16a, 16b16a, 16b
Kanten der mittleren Zone 20Edges of the middle zone 20
18a, 18b18a, 18b
Äußere ZonenOuter zones
2020
Mittlere ZoneMiddle zone
2222
Auftragsbereichapplication area
2424
Aussparungrecess
2626
Mittelliniecenter line

Claims (15)

  1. Cigarette paper for self-extinguishing cigarettes, wherein the cigarette paper comprises bands (10) which
    - are arranged on the cigarette paper such that they can be located in a circumferential direction on a cigarette that can be manufactured thereof, and
    - has a material which reduces the diffusion capacity applied thereto,
    wherein a band comprises two band-like outer zones (18a, 18b) and a band-like central zone (20) lying therebetween which has the following properties:
    - the outer zones (18a, 18b) of the band (10) have a width of at least 0.4 mm and at most 1.0 mm, preferably at most 0.8 mm and particularly preferably at most 0.6 mm,
    - said material is applied essentially to the entire surface of the outer zones (18a, 18b) of band (10),
    - the outer zones (18a, 18b) are directly adjacent to the central zone (20),
    - said material is not applied to the entire surface of the outer edges (16a, 16b) of the central zone (20),
    - said material is applied to at least 70%, preferably at least 75%, and at most 95%, preferably at most 90% of the area of the central zone (20),
    - the area (22) to which said material is applied is path-connected, and
    - the area of the central zone (20) to which said material is applied is path-connected.
  2. Cigarette paper according to claim 1, in which the band edges (14a, 14b) are straight and/or parallel.
  3. Cigarette paper according to claims 1 or 2, in which the pattern of application of the material within a band (10)
    - consists of two halves which are separated by a virtual centre line (26) of the band (10), and
    - can be translated into the pattern of application of the other half of the band by
    o forming a mirror image on the centre line or rotation by 180° about a centre lying on the centre line (26) and
    o an optional parallel translation parallel to centre line (26) of the pattern of application of a half of the band.
  4. Cigarette paper according to one of the preceding claims, in which the band (10) has a width of at least 4 mm, preferably at least 5 mm and/or at most 10 mm, preferably at most 7 mm and/or in which the distance between the bands (10) is at least 5 mm, preferably at least 10 mm and particularly preferably at least 15 mm and/or at most 50 mm, preferably at most 30 mm and particularly preferably at most 25 mm.
  5. Cigarette paper according to one of the preceding claims, in which the band (10) has a diffusion capacity of at most 1.0 cm/s, preferably at most 0.8 cm/s and/or at least 0.01 cm/s, preferably at least 0.1 cm/s.
  6. Cigarette paper according to one of the preceding claims, in which the amount of material applied to band (10), given as mass per applied area in the dried state, is at least 1 g/m2, preferably at least 3 g/m2 and/or at most 8 g/m2, preferably at most 6 g/m2 , and/or in which the amount of material per area to which the material is applied is essentially constant and in particular varies by less than 10%, preferably less than 5%.
  7. Cigarette paper according to one of the preceding claims, in which the material that reduces the diffusion capacity comprises a material selected from a group consisting of starch, starch derivatives, cellulose, cellulose derivatives and alginates, or a mixture thereof.
  8. Cigarette paper according to one of the preceding claims, in which the material that reduces the diffusion capacity
    - contains a filler, in particular a carbonate or an oxide, preferably chalk, magnesium oxide, aluminum hydroxide or a mixture thereof, and/or
    - contains a burn additive, in particular tri-sodium citrate or tri-potassium citrate or a mixture thereof, and/or in which the untreated cigarette paper has an air permeability in accordance with ISO 2965 between 5 CU and 300 CU, preferably between 10 CU and 200 CU.
  9. Cigarette paper according to one of the preceding claims, in which the untreated cigarette paper has a basis weight between 10 g/m2 and 60 g/m2, preferably between 20 g/m2 and 40 g/m2, which comprises wood pulp, pulp from annual plants, in particular flax or hemp, other fibrous materials, in particular sisal or jute, or a mixture thereof.
  10. Cigarette paper according to one of the preceding claims, which contains a filler, the fraction of which is at least 10% by weight, preferably at least 15% by weight and/or at most 45% by weight, preferably at most 40% by weight with respect to the entire paper mass,
    wherein the filler is in particular formed by a carbonate or oxide, preferably by precipitated chalk, magnesium oxide, aluminum hydroxide or a mixture thereof.
  11. Cigarette paper according to one of the preceding claims, which contains a burn additive, in particular tri-sodium citrate, tri-potassium citrate or a mixture thereof, wherein the fraction of the burn additive is preferably at most 5% by weight and particularly preferably between 0.5% by weight and 3.0% by weight with respect to the mass of the cigarette paper.
  12. Process for producing a cigarette paper which provides a cigarette which can be manufactured therefrom with self-extinguishing properties, having the following steps:
    - providing a base-cigarette paper, and
    - applying a material which reduces the diffusion capacity of the base-cigarette paper in the form of bands (10) which are arranged such that they are located in the circumferential direction on a cigarette which can be manufactured therefrom, wherein
    • a band (10) comprises two band-like outer zones (18a, 18b) and a band-like central zone (20) lying therebetween,
    • the outer zones (18a, 18b) of the band (10) have a width of at least 0.4 mm and at most 1.0 mm, preferably at most 0.8 mm and particularly preferably at most 0.6 mm,
    • said material is applied to the outer zones (18a, 18b) of the band (10) essentially over the entire surface,
    • said material is not applied over the entire surface to the outer edges (16a, 16b) of the central zones (20),
    • said material is applied to at least 70%, preferably at least 75% and at most 95%, preferably at most 90% of the area of the central zone (20),
    • the material is applied such that the area of application (22) is path-connected, and
    • the material is applied such that the area of application of the central zone (20) is path-connected.
  13. Process according to claim 12, in which said material is applied in form of a composition, in particular a solution, an emulsion or suspension, which contains a solvent and said material, wherein in particular, the solvent is formed by water and/or said material is formed by starch, a starch derivative, cellulose, a cellulose derivative or an alginate.
  14. Process according to claim 12 or claim 13, in which said composition is applied by a printing process, in particular by roto-gravure printing or flexographic printing, or sprayed, wherein said material is preferably applied in a single application step, in particular in a single printing procedure.
  15. Process according to one of claims 12 to 14, in which the composition contains substances which counteract the formation of wrinkles, in particular propylene glycol or glycerin, and/or
    in which the printed cigarette paper is moistened after the application step and a first drying and is dried in a further drying step, preferably under mechanical extension or stretching.
EP20130779596 2012-11-30 2013-10-22 Improved cigarette paper for self-extinguishing cigarettes Active EP2760297B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13779596T PL2760297T3 (en) 2012-11-30 2013-10-22 Improved cigarette paper for self-extinguishing cigarettes

Applications Claiming Priority (2)

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DE102012111635.0A DE102012111635B8 (en) 2012-11-30 2012-11-30 Improved cigarette paper for self-extinguishing cigarettes and process for its preparation
PCT/EP2013/072004 WO2014082796A1 (en) 2012-11-30 2013-10-22 Improved cigarette paper for self-extinguishing cigarettes

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EP2760297A1 EP2760297A1 (en) 2014-08-06
EP2760297B1 true EP2760297B1 (en) 2015-05-20

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EP (1) EP2760297B1 (en)
KR (1) KR102169427B1 (en)
CN (1) CN104812258B (en)
DE (1) DE102012111635B8 (en)
ES (1) ES2537511T3 (en)
MY (1) MY171745A (en)
PH (1) PH12015500638B1 (en)
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US20220287358A1 (en) * 2019-08-23 2022-09-15 Jt International Sa Smoking Article Wrapper

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PH12015500638A1 (en) 2015-05-11
DE102012111635B8 (en) 2014-06-26
DE102012111635B3 (en) 2014-03-20
PH12015500638B1 (en) 2015-05-11
CN104812258A (en) 2015-07-29
KR20150090083A (en) 2015-08-05
MY171745A (en) 2019-10-27
ES2537511T3 (en) 2015-06-09
WO2014082796A1 (en) 2014-06-05
BR112015008540A2 (en) 2017-07-04
US20150289560A1 (en) 2015-10-15
EP2760297A1 (en) 2014-08-06
US9392818B2 (en) 2016-07-19
CN104812258B (en) 2017-03-08
PL2760297T3 (en) 2015-10-30
KR102169427B1 (en) 2020-10-26

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