JP2023520152A - Wrapping paper for smoking articles with improved ash formation - Google Patents

Abstract

The present invention provides a wrapping paper for smoking articles containing pulp fibers filled with calcium carbonate particles, wherein the mass of said pulp fibers filled with calcium carbonate particles is at least 1% of the mass of said wrapping paper. and wherein the calcium carbonate particles in the calcium carbonate particle-filled pulp fibers constitute 5 to 80% of the mass of said calcium carbonate particle-filled pulp fibers.

Description

The present invention relates to wrapping paper for smoking articles containing pulp fibers loaded with filler particles that impart advantageous properties to the paper. In particular, the ash from smoking articles made from this wrapping paper has a better appearance.

A typical smoking article comprises a cylindrical tobacco rod containing an aerosol-forming material, typically tobacco or tobacco-based material, wrapped by a wrapper. In most cases, the packaging material comprises paper containing pulp fibers, ie a web-shaped material. Additionally, the smoking article includes a filter wrapped with filter wrapping paper and a tipping-paper that wraps both the filter and a portion of the tobacco rod, thereby bonding the filter and the tobacco rod together. can have

During use of the smoking device, the aerosol-forming material is heated or combusted such that an aerosol is formed during use of the smoking device, flows through the smoking device, and is inhaled by the consumer.

Smoking articles also have additional components that transport or cool the aerosol, typically positioned between the tobacco rod and the filter, particularly where the aerosol-forming material is only heated and not combusted. can.

During the burning or heating of the tobacco rod to release the aerosol, the wrapper of the tobacco rod is pyrolyzed. As a result, the wrapper may discolor and lose some of its mechanical stability, thereby altering the visual appearance of the smoking article. Its appearance on a used or in-use smoking article, particularly its tobacco rod, is called an ash appearance.

From the consumer's point of view, if the smoking article has a good gray appearance, i.e., the tobacco rod retains substantially its cylindrical shape after burning or heating, exhibits a uniform white color, and black particles protruding from the wrapping material; For example, the absence of tobacco particles and ash indicates that the smoking article is of high quality.

Various options are known in the prior art for improving the gray appearance of smoking articles. As an example, the basis weight of the wrapper can be increased, or combustion additives such as trisodium citrate or tripotassium citrate can be added, or their content can be increased. . These options have the drawback of increasing the proportion of non-tobacco material in the smoking article and thus can adversely affect the taste of the smoking article. Accordingly, there is an interest in improving the ash appearance of smoking articles without adding new ingredients to the wrapper or significantly increasing its mass. This interest relates not only to wrappers directly wrapping the aerosol-forming material, but also to wrappers for other components of the smoking article in general, particularly components that may be exposed to the high temperatures of the aerosol. .

The term "wrapping paper" as used hereinafter should be understood to mean paper for wrapping at least one of the smoking articles or their components.

It is an object of the present invention to provide a wrapper for smoking articles that imparts a good gray appearance to the smoking article without significantly increasing the weight of the wrapper or adding uncommon ingredients to the wrapper. is to provide

This object is achieved by a wrapping paper for smoking articles according to claim 1, a laminate according to claim 32 and a smoking article according to claim 33 containing this wrapping paper. Advantageous embodiments are described in the dependent claims.

The inventors have found that this object can be achieved by a wrapping paper containing pulp fibers loaded with calcium carbonate particles. Pulp fibers and calcium carbonate particles are common components of wrapping paper for smoking articles, but in the prior art, the calcium carbonate particles and pulp fibers are not combined, but are only placed between the pulp fibers. be. Calcium carbonate particles of this type are referred to as "free calcium carbonate particles" to distinguish them from calcium carbonate particles that are packed in, ie, bound to, pulp fibers. Such pulp fibers loaded with calcium carbonate particles can be produced, for example, by precipitation of calcium carbonate with the simultaneous presence of pulp fibers under suitable control of the precipitation process.

Specifically, the wrapping paper of the present invention comprises pulp fibers loaded with calcium carbonate particles, wherein the mass of the pulp fibers loaded with calcium carbonate particles is at least 1% of the mass of the wrapping paper, and The calcium carbonate particles in the calcium carbonate particle-filled pulp fibers constitute 5-80% of the mass of the calcium carbonate particle-filled pulp fibers.

The inventors have found that the calcium carbonate particles associated with the pulp fibers form the skeleton that remains after the pyrolysis of the pulp fibers, which ensures the stability of the pyrolyzed wrapper, thereby e.g. It is speculated that it inhibits the particles from penetrating the wrapper. In this way the overall gray appearance of the smoking article is improved. In contrast, free calcium carbonate particles do not form such skeleton-like structures and do not contribute to improving ash appearance to the same extent. Therefore, the weight of calcium carbonate particles in the wrapper can be reduced, or the overall weight of the wrapper can be reduced, for a comparable ash appearance by using pulp fibers loaded with calcium carbonate particles. This also reduces the impact of the wrapper on the taste of the smoking article.

The wrapping paper of the present invention is particularly advantageous when it is highly breathable. Conventional wrapping papers with high air permeability have more and larger pores and cannot form a mechanically stable framework during pyrolysis, so the gray appearance is often undesirable. . This effect can be substantially complemented by the pulp fibers loaded with calcium carbonate particles in the wrapping paper of the present invention.

In some embodiments, all pulp fibers in the wrapper are loaded with calcium carbonate particles. However, apart from pulp fibers filled with calcium carbonate particles, it can also be envisaged that the wrapping paper contains pulp fibers that are not filled with calcium carbonate particles. The proportion of such pulp fibers is preferably 1 to 95%, particularly preferably 10 to 80% and most preferably 20 to 70%, relative to the weight of the wrapping paper.

Pulp fibers, and pulp fibers filled with calcium carbonate particles, are obtained from coniferous trees such as spruce, pine or fir, from deciduous trees such as eucalyptus, birch or beech, or from hemp, flax, jute, sisal, mania hemp. Or it can be obtained from other plants such as cotton. Pulp fibers can also be obtained, for example, from viscose fibres, modal fibres, regenerated cellulose such as Lyocell® or Tencel®. Mixtures of pulp fibers of various origins can be used.

The wrapping paper of the present invention contains at least 1% pulp fibers loaded with calcium carbonate particles. The wrapping paper may be uncoated or coated. In this regard, the pulp fibers loaded with calcium carbonate particles may be present in the bulk of the wrapper or any coating on the wrapper. If pulp fibers loaded with calcium carbonate particles are present in the bundle of wrapping paper, the proportion of pulp fibers loaded with calcium carbonate particles is preferably higher, at least 5%, at most 80%, particularly preferably at least 30%. %, each up to 70% relative to the weight of the wrapper. If the calcium carbonate particle-filled pulp fibers are located exclusively in any covering material of the wrapping paper, the proportion of calcium carbonate particle-filled pulp fibers relative to the weight of the wrapping paper is preferably 1 to 30, respectively. %, particularly preferably 2 to 25%.

A high percentage of pulp fibers loaded with calcium carbonate particles can reduce the percentage of free calcium carbonate particles while improving the ash appearance. It may even be possible to reduce the total content of calcium carbonate particles in the wrapping paper without deteriorating the ash appearance by using pulp fibers loaded with calcium carbonate particles. However, pulp fibers filled with calcium carbonate particles form fewer hydrogen bonds, which can reduce the tensile strength of the wrapper as a whole. Therefore, especially when the pulp fibers are filled with a large amount of calcium carbonate particles, the amount of pulp fibers filled with calcium carbonate particles in the wrapping paper cannot be arbitrarily selected.

Preferably, the pulp fibers loaded with calcium carbonate particles are obtained from deciduous trees such as eucalyptus, birch or beech. These pulp fibers are generally less susceptible to mechanical stress during manufacture of the wrapping paper, such as refining, so that very little calcium carbonate particles are lost during the manufacturing process.

The calcium carbonate particles of the calcium carbonate particle-filled pulp fiber are preferably precipitated calcium carbonate particles, particularly preferably precipitated calcium carbonate particles having a rhombohedral crystal structure. These structures on pulp fibers can be produced particularly well in a precipitation process.

In the wrapping paper of the present invention, the mass of calcium carbonate particles is 5-80% with respect to the mass of pulp fibers filled with calcium carbonate particles. The mass of calcium carbonate particles relative to the mass of pulp fibers loaded with calcium carbonate particles is preferably 10-70%, more particularly preferably 20-60%. These preferred ranges provide a particularly good compromise between the desired improvement in gray appearance and undesired reduction in tensile strength.

The wrapper may contain loose fillers that are not bound to the pulp fibers. The proportion of free filler is preferably 1 to 40%, particularly preferably 5 to 35% and in particular 10 to 30%, relative to the weight of the wrapping paper. These fillers play a role in influencing the whiteness, opacity and pore structure of the wrapping paper. However, a high free filler content reduces the tensile strength of the wrapper. Furthermore, when using loose filler, there is a risk that during the manufacture of the smoking article, the loose filler will be deposited as dust, for example in further processing steps, thus shortening the cleaning intervals of the machine. At preferred spacings, the advantage of using loose fillers predominates.

Free fillers in wrapping paper are preferably carbonates, oxides, hydroxides and silicates. Particularly preferred fillers are calcium carbonate, magnesium carbonate, magnesium oxide, magnesium hydroxide, aluminum hydroxide, titanium dioxide, talc, kaolin, calcined kaolin and mixtures thereof. Precipitated calcium carbonate is very particularly preferred.

The ratio of the mass of calcium carbonate particles contained in the calcium carbonate particle-filled pulp fibers in the wrapping paper to the mass of free filler particles contributes to the gray appearance with respect to other properties such as brightness, opacity and tensile strength. can be important for coordination. Preferably, the ratio of the mass of calcium carbonate particles contained in the calcium carbonate particle-filled pulp fibers in the wrapping paper to the mass of free filler particles is from 5:95 to 100:0; :90-80:20, especially 10:90-50:50.

The wrapper may contain a burn additive. The combustion additive acts in part as an adhesive between the particles of free filler or as a sintering agent, thereby improving the mechanical stability of the pyrolyzed wrapper, thus reducing the thermal degradation of the wrapper. It affects speed and may also contribute to improved ash appearance. The burn additive may preferably be used in the wrapper that wraps the tobacco rod.

The proportion of the burning additive in the wrapping paper can be variably selected, and is preferably 0.3 to 7%, particularly preferably 0.5 to 5%, relative to the weight of the wrapping paper. Especially 0.5 to 3%.

The combustion additive is preferably citrate, malate, tartrate, acetate, nitrate, succinate, fumarate, gluconate, glycolate, lactate, oxalate, salicylate, alpha - can be selected from the group consisting of hydroxycaprylate, phosphate, chloride and hydrogen carbonate and mixtures thereof, particularly preferably trisodium citrate, tripotassium citrate and mixtures thereof You can choose from

In one embodiment of the wrapper, the wrapper is provided over substantially the entire surface with a coating comprising free calcium carbonate particles and/or pulp fibers loaded with calcium carbonate particles. In this regard, "substantially the entire surface is covered" means that the entire surface coverage is intended, or that at least 95% of the surface is covered. A properly selected coating can further improve the gray appearance without adding uncommon ingredients to the wrapper. The coating material increases the content of calcium carbonate particles on the surface of the paper, which can more easily form a stable framework that ensures the mechanical stability of the wrapping paper after pyrolysis.

Coating, for example, by processes known in the art such as a size press or film press in the coating unit of a paper machine, or by applying the composition by a printing press, especially a rotogravure press. .

As a result, a composition suitable for making a dressing contains a solvent, preferably water, and calcium carbonate particles or pulp fibers loaded with calcium carbonate particles. Such calcium carbonate particles that do not belong to the calcium carbonate particles of the filled pulp fibers are called free calcium carbonate particles, as is the wrapping paper itself. The proportion of free calcium carbonate particles in the composition may preferably be 0 to 40%, particularly preferably 5 to 30%, respectively, relative to the weight of the composition. The proportion of pulp fibers loaded with calcium carbonate particles can each preferably be 0-10%, particularly preferably 1-7%, relative to the weight of the composition. It should be noted that the coatings described above correspond to the applied composition in the dry state, ie especially when the solvent has evaporated.

If the composition contains free calcium carbonate particles, the composition should contain a binder to secure the free calcium carbonate particles to the wrapper. This binder also remains in the dressing formed by application of the composition. If the composition contains only calcium carbonate particles in the form of pulp fibers filled with calcium carbonate particles, a binder is not necessary, but is preferred for better immobilization. Particularly preferably, the binder is selected from the group consisting of starch, starch derivatives, carboxymethylcellulose, cellulose derivatives, polyvinyl alcohol, galactomannans, gum arabic, alginates and mixtures thereof. In particular, the starch is mechanically fragmented and chemically crosslinked because it is not water soluble in a chemical sense and therefore hardly penetrates the paper structure and thus reduces the air permeability of the wrapping paper. is starch. A person skilled in the art can choose the amount of binder empirically, especially with respect to the requirements of the application process.

The composition may contain additional ingredients that can be appropriately selected by those skilled in the art; such additional ingredients include, for example, combustion additives, colorants, fragrances, humectants such as glycerol and propylene glycol. , or substances that affect viscosity.

Application of the composition may be on one side of the wrapper or may be on both sides. Preferably, however, the composition is applied to the outwardly facing side of the smoking article manufactured therefrom. This is commonly known during the manufacture of wrapping paper and is most often the opposite side of the paper machine wire. Preferably, therefore, the composition is applied to the side of the wrapper opposite the paper machine wires, also called the felt side.

After drying of the applied composition, the weight per unit area of the coating is preferably 0.5 to 10 g/m ² , particularly preferably at least 1 to 5 g/m ² .

In a preferred embodiment, the combined weight of the free calcium carbonate particles and the calcium carbonate particles of the filled pulp fibers in the coating is between 1 and 20% of the weight of the coated wrapping paper, particularly preferred. is 2-15%. In this regard, the bundle of wrapping paper preferably further comprises calcium carbonate particle-filled pulp fibers, and the mass of calcium carbonate particle-filled pulp fibers in the wrapping paper without a coating is the weight of the wrapping paper preferably 1 to 70% of the mass of Particularly preferred is 1-60%, and the calcium carbonate particles in the calcium carbonate particle-filled pulp fibers constitute 10-60% of the mass of the calcium carbonate particle-filled pulp fibers.

In a preferred embodiment, the wrapping paper of the invention is also a component of a laminate, particularly preferably a laminate comprising a further material having a thermal conductivity at least 2 times, preferably at least 4 times, greater than that of the wrapping paper. can be In a particularly preferred embodiment, this further material is formed by aluminum foil. Such laminates are primarily used in smoking articles in which the aerosol-forming material is only heated and not burned, preventing the smoking article from being ignited and smoked like a conventional cigarette.

In a further preferred embodiment of the wrapper for a smoking article, the smoking article is a cigarette and the wrapper has a pattern or structure for reducing the fire spread of the smoking article, particularly It preferably further has bands printed in the circumferential direction.

The basis weight of the wrapping paper of the invention is preferably 15 to 150 g/m ² , particularly preferably 20 to 120 g/m ² and most preferably 20 to 40 g/m ² . The basis weight of the wrapper can be determined according to ISO 536:2019, and the coating, if present, is added to the basis weight.

The thickness of the wrapping paper of the invention is preferably 10-200 μm, preferably 15-120 μm, more particularly preferably 30-100 μm. Thickness can be determined according to ISO 534:2011 for a single layer of wrapper. Again, if a dressing is present, it adds to the thickness of the wrapper.

The mechanical properties of the wrapper of the present invention can be important for manufacturing smoking articles from the wrapper. Tensile strength, elongation at break and tensile energy absorption are important mechanical properties, all of which can be determined according to ISO 1924-2:2008.

The tensile strength of the wrapping paper is preferably at least 7 N/15 mm, particularly preferably at least 8 N/15 mm, very particularly preferably at least 10 N/15 mm. Due to the high cost of materials and energy for increasing the tensile strength in paper production, it is advantageous to have a tensile strength of at most 100 N/15 mm, preferably at most 80 N/15 mm, particularly preferably at most 70 N/15 mm. is. Tensile strength can be increased primarily by increasing the basis weight, increasing the proportion of pulp fibers, and more intensively refining the pulp fibers.

It is advantageous for the wrapper to have a specific elongation at break to compensate for the different speeds of machines for manufacturing smoking articles from wrappers. Preferably, the elongation at break of the wrapping paper of the invention is between 0.9 and 3%, particularly preferably between 1 and 2%.

A further mechanical parameter important to the processability of wrappers to form smoking articles is tensile energy absorption. Tensile energy absorption describes how much energy is required to tear the paper. In the wrapping paper of the invention, the tensile energy absorption is preferably 3-50 J/m ² , particularly preferably 3.5-35 J/m ² .

The whiteness (ISO brightness) of a wrapping paper can be important for its visual and gray appearance. Whiteness is determined according to ISO 2470-1:2016. In general, white wrapping papers are preferred for visual reasons, and the whiteness of the wrapping papers of the invention is preferably at least 80%, particularly preferably at least 90%.

Whiteness can be affected, for example, by the choice of free filler; in particular, titanium dioxide can be used to significantly increase whiteness.

Wrapping paper opacity is also important for appearance. High opacity is generally advantageous because the components of the smoking article are not visible through the wrapper. Opacity is measured according to ISO 2471:2008. Preferably, the wrapping paper has an opacity of at least 70%, particularly preferably at least 80%. Opacity can also be increased by increasing the amount of free filler in the wrapper.

When applying the wrapping paper of the present invention to specific uses in smoking articles, its breathability is important. In such applications, air should enter the smoking article through the wrapper during use of the smoking article, for example to dilute the aerosol. Breathability can be measured according to ISO 2965:2019.

The air permeability of the wrapping paper of the present invention is preferably 0 to 300 cm ³ /(cm ² ·min·kPa), particularly preferably 10 to 250 cm ³ /(cm ² ·min·kPa), particularly preferably 20 to 150 cm ³ /( cm ² ·min · kPa). If the wrapping paper is coated, its air permeability is lower, at most 120 cm ³ /(cm ² ·min · kPa), particularly preferably at most 100 cm ³ /(cm ² ·min · kPa), more especially Preferably, it is at most 80 cm ³ /(cm ² ·min · kPa).

An increased content of calcium carbonate particles bound to the pulp fibers can be used to particular advantage in conventional wrapping papers, as more breathable papers generally have a poorer ash appearance. In a particular embodiment of the invention, the wrapping paper of the invention comprises pulp fibers loaded with calcium carbonate particles, wherein the mass of the pulp fibers loaded with calcium carbonate particles is at least 10% of the mass of the wrapping paper. and the calcium carbonate particles in the calcium carbonate particle-filled pulp fiber constitute 20-80% of the mass of the calcium carbonate particle-filled pulp fiber, and conform to ISO 2965:2019 for wrapping paper Air permeability is 50 to 300 cm ³ /(cm ² ·min·kPa).

type and amount of pulp fiber, type and amount of pulp fiber filled with calcium carbonate particles, content of calcium carbonate particles in pulp fiber filled with calcium carbonate particles, type and amount of free filler, amount of combustion additive The preferred and particularly preferred ranges given above for types and amounts, and mechanical parameters such as tensile strength, elongation at break and tensile energy absorption, and optical parameters such as brightness and opacity are also valid for this particular embodiment. is. However, dressings are not preferred for this particular embodiment as they may excessively reduce breathability.

The smoking article of the invention contains an aerosol-forming material and a wrapper of the invention. In a preferred embodiment of the smoking article, the aerosol-forming material contains tobacco and the wrapper wraps the aerosol-forming material.

In a further preferred embodiment, the smoking article is a smoking article of the present invention in which the aerosol-forming material is only heated and not combusted.

In a particularly preferred embodiment, the smoking article is a cigarette and the wrapper is cigarette paper.

The wrapping paper of the present invention and the smoking articles of the present invention can be manufactured using methods known in the art.

FIG. 1 shows, for purposes of illustration, an electron micrograph of pulp fibers loaded with coarse calcium carbonate particles, which constitute about 20% of the mass of the pulp fibers loaded with calcium carbonate particles. FIG. 2 shows, by way of illustration, an electron micrograph of pulp fibers filled with fine calcium carbonate particles, the calcium carbonate particles constituting about 20% of the mass of the calcium carbonate particle-filled pulp fibers. . Figure 3 shows the ash appearance of three filter cigarettes made from wrappers not of the invention. Figure 4 shows the ash appearance of three filter cigarettes made from the wrapping paper of the present invention.

Some preferred embodiments of the wrapping paper of the invention are described below and compared with wrapping papers not of the invention.

A non-inventive wrapping paper given as a reference has a basis weight of 32.6 g/m ² and is made from 28% pulp fibers from softwoods, 42% pulp fibers from deciduous trees and 30% free calcium carbonate particles, with a percentage of is relative to the mass of the wrapping paper. Further properties of this wrapping paper are shown in Table 1, row "Reference".

In total, 14 wrapping papers of the present invention designated AK and XZ were produced and the compositions of those wrapping papers are shown in Table 1. In Table 1, "SW" in % indicates the percentage of pulp fibers from softwoods, "HW" in % indicates the percentage of pulp fibers from deciduous trees, and "CF" in %. indicates the percentage of pulp fibers loaded with calcium carbonate particles and "FI" in % indicates the percentage of free filler. Percentages are relative to the weight of the wrapper.

Pulp fibers from soft and deciduous trees are standard products available on the market. Pulp fibers filled with calcium carbonate particles were obtained from Schaefer Kalk. The free filler mass was formed by precipitated calcium carbonate particles.

"CCP" in Table 1 indicates the mass of calcium carbonate particles in pulp fibers filled with calcium carbonate particles as a percentage of the mass of pulp fibers filled with calcium carbonate particles. Also, the size of these particles is indicated as "fine" or "coarse." In this regard, FIG. 1 shows an electron micrograph of pulp fibers loaded with coarse calcium carbonate particles, and FIG. 2 shows an electron micrograph of pulp fibers loaded with fine calcium carbonate particles. was also used to make some of the wrapping papers of the present invention. The weight percentage of calcium carbonate particles in the calcium carbonate particle-filled pulp fibers from FIGS. 1 and 2 was about 17.3%. Pulp fibers were formed by pulp fibers from eucalyptus.

Wrapping paper X was identical to the reference wrapping paper, and wrapping papers Y and Z were identical to wrapping paper G. The entire surface of wrapping paper Y was coated with a composition of 89% water, 5.5% mechanically fragmented and chemically crosslinked starch and 5.5% free calcium carbonate particles, the percentage being It is relative to the weight of the composition. The entire surface of wrapping papers X and Z was composed of pulp fibers filled with 95.5% water, 1% mechanically fragmented and chemically crosslinked starch and 3.5% calcium carbonate particles. The percentages are based on the weight of the composition. After applying the composition and drying, a lump of about 2 g/m ² remained on the wrapper.

Mechanically fragmented and chemically crosslinked starches are available, for example, from Emsland-Starke GmbH.

The properties of the non-inventive reference wrapping papers and the inventive wrapping papers A-K and X-Z were measured and shown in Table 2, where "BW" is basis weight, "EL" is elongation at break, "AP" is breathability.

Smoking articles in the form of filter cigarettes approximately 7.8 mm in diameter and 83 mm in length were produced from reference wrappers not of the invention and from wrappers AK and XZ of the invention. The tobacco used was an American blend, and each tobacco was wrapped in wrapping paper. The ash appearance of these smoking articles was evaluated by image analysis methods. In this regard, three cigarettes from each cigarette were lit in a vertical position and left until the tobacco was completely burned. A digital image of each cigarette was then taken under constant lighting conditions in front of a neutral background. Image analysis software then determined the percentage of non-white areas in the area of the burned tobacco rod. The ratio of non-white areas to the total area of the burned tobacco rod was expressed as a percentage and reported as the "ash index", with the average value determined from images of three cigarettes. The higher the percentage, the more non-white areas white the burned tobacco rod contains and the worse the consumer judges the gray appearance.

Ash indices determined by this method are shown in Table 3.

Figure 3 shows the ash appearance of three filter cigarettes made from a reference wrapper that is not of the invention. FIG. 4 shows the ash appearance of three filter cigarettes made from wrapping paper K of the invention. The difference is already clearly visible without quantifying the gray appearance by image analysis.

The objective of the inventive wrapping papers A to K is to achieve as similar properties as possible compared to the non-inventive reference wrapping papers, demonstrating clearly the beneficial effects of pulp fibers loaded with calcium carbonate particles. It's about making it possible. Therefore, the examples should not be understood as limiting the invention, and a person skilled in the art will understand, for example, different compositions, different basis weights, different thicknesses, different breathability or other mechanical or optical properties. A wrapping paper of the present invention having

From Table 3, the ash index of the cigarettes with wrappers A to K is always lower than the ash index of the cigarettes with the reference wrapper, which is not according to the invention. This means that wrapping papers A to K give a better gray appearance.

From Table 2, it can be seen that the inventive wrapping papers A-K compare to the non-inventive reference wrapping paper in terms of basis weight, thickness, elongation at break, brightness and opacity as intended by the manufacture of the wrapping paper. It can be seen that they are very similar. The tensile strength, and therefore the tensile energy absorption, of wrappers A to K are also slightly lower than the reference wrappers, which are not of the invention. This is caused by pulp fibers containing calcium carbonate particles because the calcium carbonate particles on the pulp fibers prevent the formation of hydrogen bonds between pulp fibers, thereby reducing the tensile strength of the wrapper.

It is important that the air permeability of the wrapping papers A-K is higher than that of the non-inventive wrapping papers. Despite this higher air permeability, the cigarettes made from wrappers AK have a better ash appearance than the cigarettes made from the reference wrappers. This shows that at high air permeability it is particularly advantageous to use pulp fibers filled with calcium carbonate particles.

Of course, if desired, the person skilled in the art can reduce the air permeability of the wrapping papers A to K, for example by refining the pulp fibers more intensively, thereby obtaining the same values as the reference wrapping paper. This is expected to further reduce the ash index and further improve the ash appearance.

Wrapping paper I (ash index 7.9) containing a total of about 36% calcium carbonate particles free and associated with pulp fibers and a non-inventive reference containing exclusively 40% free calcium carbonate particles A comparison with wrapping paper (ash index 11.1) shows that the ash appearance can be improved despite the lower total content of calcium carbonate particles.

Coated wrappers X, Y and Z all show an improvement in ash appearance. Papers X-Z also all have higher tensile strengths than the non-inventive reference wrapper and the uncoated inventive wrapper A-K, which is a further advantage of these embodiments.

Overall, the wrapping paper of the present invention can be used without adversely affecting other properties of the wrapping paper, without substantially increasing the weight of the wrapping paper, or adding uncommon ingredients to the wrapping paper. It can be seen that a substantial improvement in ash appearance can be achieved without addition.

Claims (35)

A wrapping paper for smoking articles containing pulp fibers filled with calcium carbonate particles, wherein the mass of said pulp fibers filled with calcium carbonate particles is at least 1% of the mass of said wrapping paper, and The wrapping paper, wherein the calcium carbonate particles in the calcium carbonate particle-filled pulp fibers constitute 5-80% of the mass of the calcium carbonate particle-filled pulp fibers. In addition to the pulp fibers filled with calcium carbonate particles, it contains pulp fibers not filled with calcium carbonate particles, and the ratio thereof is 1 to 95%, preferably, relative to the weight of the wrapping paper. Wrapping paper according to claim 1, which is 10-80%, in particular at least 20-70%. Said pulp fibers filled with calcium carbonate particles and, if present, pulp fibers not filled with calcium carbonate particles are at least partially derived from softwoods, in particular spruce, pine or fir, to deciduous trees, in particular eucalyptus, birch or 3. Wrapping paper according to claim 1 or 2, obtained from beech or from hemp, flax, sisal, manila or cotton. Said pulp fibers filled with calcium carbonate particles and, if present, pulp fibers not filled with calcium carbonate particles are obtained at least partially from regenerated cellulose and in particular from viscose fibers, modal fibers, Lyocell ( ®) or Tencel®. The pulp fibers filled with calcium carbonate particles are at least partially located in the bundle of the wrapping paper, and the proportion of the pulp fibers filled with calcium carbonate particles is preferably each relative to the mass of the wrapping paper. is between 5 and 80%, particularly preferably between 30 and 70%. the pulp fibers having a coating and being filled with calcium carbonate particles are at least partially located in the coating and the pulp fibers loaded with calcium carbonate particles are located only in the coating; are each 1-30%, preferably 2-25%, relative to the weight of the wrapping paper. 7. The method according to any one of the preceding claims, wherein the calcium carbonate particles of the pulp fibers filled with calcium carbonate particles are formed by precipitated calcium carbonate particles, in particular precipitated calcium carbonate particles with a rhombohedral crystal structure. wrapping paper. Wrapping paper according to any one of the preceding claims, wherein the mass of calcium carbonate particles relative to the mass of pulp fibers filled with calcium carbonate particles is 10-70%, preferably 20-60%. . It further contains a free filler that is not bound to the pulp fibers, and the ratio of the free filler is preferably 1 to 40%, particularly preferably 5 to 35%, particularly preferably 5 to 35%, based on the weight of the wrapping paper. The wrapping paper according to any one of claims 1 to 8, which is 10-30%. said free fillers are carbonates, oxides, hydroxides and silicates or combinations thereof, especially calcium carbonate, preferably precipitated calcium carbonate, magnesium carbonate, magnesium oxide, magnesium hydroxide, aluminum hydroxide, dioxide 10. The wrapping paper of Claim 9 formed by titanium, talc, kaolin, calcined kaolin and mixtures thereof. The ratio of the mass of calcium carbonate particles contained in the pulp fibers filled with calcium carbonate particles in the wrapping paper to the mass of the free filler particles is 5:95 to 100:0, preferably 10:90 to Wrapping paper according to claim 9 or 10, which is 80:20, even more preferably 10:90 to 50:50. It further contains a burning additive, the proportion of which is preferably 0.3 to 7%, particularly preferably 0.5 to 5%, in particular at least 0.5 to 3%, relative to the weight of the wrapping paper. A wrapping paper according to any one of claims 1 to 11. The burn additive is citrate, malate, tartrate, acetate, nitrate, succinate, fumarate, gluconate, glycolate, lactate, oxalate, salicylate, α- selected from the group consisting of hydroxycaprylate, phosphate, chloride and bicarbonate and mixtures thereof, particularly preferably from the group consisting of trisodium citrate, tripotassium citrate and mixtures thereof 13. The wrapping paper of claim 12. Wrapping paper according to any one of the preceding claims, wherein at least 95% of the surface of the wrapping paper has a coating containing free calcium carbonate particles and/or pulp fibers loaded with calcium carbonate particles. . said coating material further comprising a binder suitable for binding said free calcium carbonate particles or said pulp fibers loaded with calcium carbonate particles and said wrapping paper, said binder preferably comprising starch, 14. Especially selected from the group consisting of mechanically fragmented and chemically crosslinked starches, starch derivatives, carboxymethylcellulose, cellulose derivatives, polyvinyl alcohols, galactomannans, gum arabic, alginates and mixtures thereof. Wrapping paper described in. 16. Wrapping paper according to claim 14 or 15, wherein the coating material contains further ingredients selected from the group consisting of burning additives, colorants, perfumes, wetting agents, in particular glycerol or propylene glycol, or viscosity adjusting substances. . A wrapper according to any one of claims 14 to 16, wherein the covering material is located on the side of the wrapper facing the outside of the smoking article to be manufactured. Wrapping paper according to any one of claims 14 to 17, wherein the covering material has a weight per unit area of 0.5 to 10 g/m ² , particularly preferably of at least 1 to 5 g/m ² . In the coating material, the combined mass of the free calcium carbonate particles and the calcium carbonate particles of the pulp fibers filled in the coating material is 1 to 20% of the mass of the coated wrapping paper, particularly preferably The wrapping paper according to any one of claims 14-18, which is 2-15%. The bundle of wrapping paper further contains pulp fibers filled with calcium carbonate, and the mass of the pulp fibers filled with calcium carbonate particles in the wrapping paper without the coating material is preferably the mass of the wrapping paper. 19. 1-60% and wherein the calcium carbonate particles in said pulp fibers filled with calcium carbonate particles constitute preferably 1-60% of the mass of said pulp fibers filled with calcium carbonate particles. Wrapping paper described in. The wrapping paper is for cigarettes, and the wrapping paper has a pattern or structure, preferably a circumferentially printed strip, for reducing the fire spread of the smoking article as measured in accordance with ISO 12863:2010. The wrapping paper according to any one of claims 1 to 20, comprising. basis weight of 15 to 150 g/m ² , preferably 20 to 120 g/m ² , particularly preferably 20 to 40 g/m ² , and if a coating is present, it is added to the basis weight of the wrapping paper; The wrapping paper according to any one of claims 1-21. 23. Any one of claims 1 to 22, having a thickness of 10-200 μm, preferably 15-120 μm, particularly preferably 30-100 μm, which, if present, adds to the thickness of the wrapping paper. Wrapping paper described in paragraph. Wrapping paper according to any one of the preceding claims, having a tensile strength of at least 7 N/15 mm, preferably of at least 8 N/15 mm, particularly preferably of at least 10 N/15 mm. Wrapping paper according to any one of the preceding claims, having a tensile strength of at most 100 N/15 mm, preferably at most 80 N/15 mm, particularly preferably at most 70 N/15 mm. Wrapping paper according to any one of the preceding claims, having an elongation at break of 0.9-3%, particularly preferably 1-2%. Wrapping paper according to any one of the preceding claims, having a tensile energy absorption of 3 to 50 J/m ² , preferably 3.5 to 35 J/m ² . Wrapping paper according to any one of the preceding claims, having a whiteness according to ISO 2470-1:2016 of at least 80%, particularly preferably of at least 90%. Wrapping paper according to any one of the preceding claims, having an opacity according to ISO 2471:2008 of at least 70%, particularly preferably of at least 80%. The air permeability according to ISO2965:2019 is at least 0 to 300 cm ³ /(cm ² ·min·kPa), preferably 10 to 250 cm ³ /(cm ² ·min·kPa), particularly preferably 20 to 150 cm ³ /(cm ^2.min.kPa ). Wrapping paper according to any one of the preceding claims. The mass of the calcium carbonate particle-filled pulp fibers is at least 10% of the mass of the wrapping paper, and the calcium carbonate particles in the calcium carbonate particle-filled pulp fibers are equal to the calcium carbonate particle-filled pulp fibers. Any one of claims 1 to 30, which constitutes 20 to 80% of the mass of the pulp fiber, and the air permeability of the wrapping paper according to ISO 2965:2019 is 50 to 300 cm ³ /(cm ² min.kPa). or the wrapping paper according to item 1. A laminate comprising a wrapping paper according to any one of claims 1 to 31 and a further material, wherein the thermal conductivity of said further material is at least twice the thermal conductivity of said wrapping paper, preferably Said laminate, at least four times greater, said further material being preferably formed by an aluminum foil. A smoking article comprising an aerosol-forming material and a wrapper according to any one of claims 1-31. 34. A smoking article according to claim 33, wherein said aerosol-forming material comprises tobacco, said smoking article is preferably a cigarette, and said wrapper is cigarette paper. 34. A smoking article according to claim 33, wherein, in intended use, the aerosol-forming material is only heated and not combusted.

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