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EP4294979A1 - Papier d'enrobage amélioré à faible capacité de diffusion - Google Patents

Papier d'enrobage amélioré à faible capacité de diffusion

Info

Publication number
EP4294979A1
EP4294979A1 EP22706041.5A EP22706041A EP4294979A1 EP 4294979 A1 EP4294979 A1 EP 4294979A1 EP 22706041 A EP22706041 A EP 22706041A EP 4294979 A1 EP4294979 A1 EP 4294979A1
Authority
EP
European Patent Office
Prior art keywords
wrapping paper
fiber pulp
short
ground
long
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22706041.5A
Other languages
German (de)
English (en)
Inventor
Roland Zitturi
Dietmar Volgger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delfortgroup AG
Original Assignee
Delfortgroup AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delfortgroup AG filed Critical Delfortgroup AG
Publication of EP4294979A1 publication Critical patent/EP4294979A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • 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
    • A24D1/20—Cigarettes specially adapted for simulated smoking devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/30—Alginic acid or alginates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

  • the invention relates to a wrapping paper with low diffusion capacity for a smoking article, which gives the smoking article a low smoldering speed or causes the smoking article to self-extinguish, and which has a low standard deviation of the diffusion capacity, and smoking articles comprising such a wrapping paper and a method for producing the wrapping paper.
  • Smoking articles known in the prior art typically comprise an aerosol generating material and a paper encasing the aerosol generating material to form a typically cylindrical rod.
  • the aerosol generating material is tobacco or a processed tobacco material.
  • the smoking article also includes a filter capable of filtering components of the aerosol, which is wrapped by a filter wrapping paper and another wrapping paper that connects the filter and the wrapped rod of aerosol-generating material.
  • Legal regulations therefore require that the smoking articles are designed in such a way that they extinguish themselves with a probability of at least 75% in a test specified in ISO 12863:2010.
  • a common means of meeting these legal requirements is to provide the wrapping paper of the smoking article with bands in the circumferential direction in the area of the aerosol-generating material, so that in the area of the bands the diffusion of oxygen into the smoking article is so low that the smoking article extinguishes itself .
  • Tapes of this type can be produced, for example, by the local application of film-forming compositions which locally reduce the diffusion capacity of the base paper.
  • wrapping paper in such a way that it has a low diffusion capacity over its entire surface. Such wrapping paper also reliably leads to self-extinguishing. The diffusion capacity can also be selected so high that there is no or no frequent self-extinguishing. Such smoking articles then have low smoldering speeds, which can be of interest for some applications. It is also common to have such wrapping papers over the entire To perforate surface or part of the surface, so that when smoking the smoking article, air flows through the perforation into the smoking article and dilutes the resulting aerosol. It has been shown that even severe perforation does not significantly reduce the probability of self-extinction.
  • wrapping papers have prevailed that are equipped with bandför-shaped areas arranged in the circumferential direction, in which the diffusion capacity is locally reduced. Attempts to produce wrapping paper with a uniform diffusion capacity that is sufficiently low for the purpose of self-extinguishing have so far not provided satisfactory results in practice. On the one hand, it has already proved difficult to achieve a sufficiently low diffusion capacity for the purposes of self-extinguishing with wrapping papers that contain filler. In addition, such wrapping papers cannot be produced in practice in such a way that the legal requirements with regard to self-extinguishing are reliably met.
  • the object of the invention is to provide a wrapping paper for a smoking article which, despite a significant filler content, allows the probability of self-extinguishing or a low smoldering rate to be set reliably and stably in a smoking article made from it.
  • "wrapping paper” is understood to mean only that paper which contains the aerosol-generating material material, because only this paper has an effect on the self-extinguishing or the glow speed of the smoking article. Filter wrapping papers and tipping papers are not wrapping papers within the meaning of this invention.
  • This object is achieved by a wrapping paper for a smoking article according to claim 1, and a smoking article according to claim 21. Furthermore, it is solved by a method for producing a wrapping paper according to claim 24.
  • a wrapping paper which is suitable for use on smoking articles and which comprises long-fiber pulp, short-fiber pulp and inorganic filler, wherein at least part of the long-fiber pulp is beaten and the beaten long-fiber pulp comprises at least 15% and not more than 70% of the mass of the wrapping paper and wherein at least part of the short fiber pulp is ground and the ground short fiber pulp makes up at least 5% and not more than 80% of the mass of the wrapping paper, and the ground short fiber pulp has a freeness of at least 20 °SR and not more than 60 °SR, and wherein the short fiber pulp makes up at least 10% and at most 80% of the mass of the wrapping paper, and at least 5% and at most 45% of the mass of the wrapping paper is formed by one or more inorganic fillers, and the basis weight of the wrapping paper is at least ens is 15 g/m 2 and not more than 45 g/m 2 and the diffusing capacity of the wrapping paper is not less than
  • a wrapping paper for smoking articles with a low diffusion capacity is described in WO 2011/120687 Ai, for example. With this wrapping paper, however, the diffusion capacity had to be chosen to be very low in order to reliably meet the legal requirements regarding self-extinguishing. Another wrapping paper that has the same problems is also described in WO 2020/201716.
  • the self-extinguishing ability of a smoking article is determined by the diffusion capacity of the Wrapping paper essentially determined, but the transition from 100% self-extinguishing to 0% self-extinguishing takes place in a very narrow interval of the diffusion capacity with a width of about 0.3 cm / s, the position of the interval depends significantly on the construction of the smoking article, in particular the aerosol generating material. For example, if one wants to set the probability of self-extinguishing to ⁇ 10%, then the diffusion capacity must be set with an accuracy of at least about ⁇ 0.03 cm/s.
  • the inventors have found that with such a narrow range of the required diffusion capacity, it is not sufficient to set the average diffusion capacity in the manufacturing process, which is not possible with the wrapping papers from the prior art if the wrapping papers contain filler.
  • the diffusing capacity of the wrapping paper also has a sufficiently small standard deviation, specifically a standard deviation that is less than 0.05 cm/s. In the case of the previously known wrapping papers described above, which have a low diffusion capacity, the standard deviations were well above this limit.
  • the diffusion capacity measured according to CORESTA Recommended Method (CRM) 77
  • the air permeability indicates the permeability of the wrapping paper for air due to a pressure difference of 1 kPa.
  • Wrapping papers for smoking articles usually contain long-fiber cellulose, i.e. cellulose from conifers or certain annual plants, and the person skilled in the art can adjust the air permeability by grinding the long-fiber cellulose, among other things, in the expectation that the diffusion capacity will also be fixed. This is an obvious method because air permeability can be approximately measured on-line during papermaking. Two problems arise from this.
  • diffusion capacity and air permeability are both determined by the pore structure of the wrapping paper, but they are not directly related.
  • the type of long-fiber pulp for example a change from wood pulp to annual plant pulp, or the content of inorganic filler can change the diffusion capacity independently of the air permeability. It is therefore not possible, at least not in the case of low diffusion capacities, to adjust the diffusion capacity precisely via the air permeability.
  • the air permeability for a given composition of the wrapping paper is essentially adjusted by beating the long-fiber pulp, the diffusion capacity D and the air permeability Z depend approximately on D « kZ 05 from each other, where k is a constant of proportionality.
  • the rate of change dD/dZ becomes very high, which means that even very small changes in air permeability cause significant changes in the diffusion capacity. Since the air permeability can hardly be measured with an accuracy of less than ⁇ 2 cm 3 / (cm 2 -min) even on separate measuring instruments in this low range due to the unavoidable leakage currents in the area of the measuring head, it cannot be set more precisely either. The achieved diffusion capacity deviates correspondingly strongly from the target value.
  • the inventors have found that significant progress can be made if the diffusion capacity itself is made the actual target value of a regulation in the manufacturing process. They have also recognized that additional control variables are required in order to set the diffusion capacity and keep its standard deviation low. According to the invention, these additional variables are the degree of beating of the short-fiber pulp and the mixing ratios of ground and unground pulp fibers or of long-fiber pulp and short-fiber pulp.
  • Wrapping papers for smoking articles may contain short fiber pulp to add bulk to the wrapping paper.
  • the proportion of short-fiber pulp should not be too high, because otherwise the strength of the wrapping paper decreases too much.
  • the short-fiber pulp is generally not ground either, because the person skilled in the art only expects a higher energy consumption from this, but no advantages.
  • WO 2011/166012 describes a wrapping paper for smoking articles in which short-fiber pulp is ground, the aim there is to provide a cost-effective wrapping paper which, despite an extremely high proportion of short-fiber pulp of at least 90% of the mass, has a sufficient has strength.
  • WO 2011/166012 did not recognize that with a lower proportion of short-fiber pulp, beating the short-fiber pulp can offer advantages in terms of setting low diffusion capacities.
  • the inventors have also established that a large number of additional parameters in combination must be chosen favorably in order to be able to set the diffusion capacity with the required accuracy and to achieve a low standard deviation of the diffusion capacity, these include, among others the degree of beating of the long-fiber pulp, the degree of beating of the short-fiber pulp, the proportions of ground and unrefined long fiber pulp, the proportions of refined and unrefined short fiber pulp, the content of inorganic filler and the basis weight.
  • the wrapping paper according to the invention contains long-fiber pulp, with at least part of the long-fiber pulp being ground and the ground long-fiber pulp making up at least 15% and at most 70% of the mass of the wrapping paper, preferably making up at least 20% and at most 65% of the mass of the wrapping paper.
  • the freeness of the ground long fiber pulp is preferably at least 85°SR and at most 95°SR and particularly preferably at least 88°SR and at most 94°SR. These intervals are particularly favorable for the typical composition of the wrapping paper according to the invention. In the case of a particularly high or low filler content or a particularly high or low content of ground short-fiber pulp, it may be better to select a degree of freeness outside of these intervals.
  • the degree of freeness of the long-fiber pulp is the essential parameter for changing the diffusion capacity on a large scale, with a high degree of freeness leading to a low diffusion capacity. Due to the presence of the filler, however, even very intensively ground long fiber cellulose is not sufficient to reduce the diffusion capacity to particularly low values.
  • the long-fiber pulp in the context of this invention is pulp that is obtained from coniferous trees, preferably spruce, pine or fir, or from flax, hemp, jute, ramie, bamboo, abaca, sisal, kenaf or cotton. Mixtures of pulps from these sources can also be used.
  • the wrapping paper according to the invention contains short-fiber pulp, with at least part of the short-fiber pulp being ground and the ground short-fiber pulp making up at least 5% and at most 80% of the mass of the wrapping paper, preferably making up at least 10% and at most 70% of the mass of the wrapping paper.
  • the freeness of the ground short fiber pulp measured according to ISO 5267-1:1993, is at least 20°SR and at most 60°SR, preferably at least 25°SR and at most 50°SR.
  • Short-fiber pulp in the context of this invention is pulp that is obtained from deciduous trees, preferably beech, birch or eucalyptus, or from esparto grass. Mixtures of pulps from these sources can also be used.
  • the total proportion of short fiber pulp in the wrapping paper according to the invention should not be too high and is at least 10% and at most 80%, preferably at least 30% and at most 75% of the mass of the wrapping paper.
  • the mixing ratio between ground long-fiber pulp, ground short-fiber pulp and, if present, unground long-fiber pulp and unground short-fiber pulp is primarily used to precisely adjust the diffusion capacity, because it can be changed comparatively easily during the manufacture of the wrapping paper. However, it is also in accordance with the invention that the diffusion capacity is influenced by changing the degree of beating of the long-fiber pulp or the short-fiber pulp.
  • the inventors assume that the fine particles of the ground short-fiber pulp are distributed homogeneously over the volume of the wrapping paper and thus help to influence the pore structure favorably.
  • the homogenization of the fiber geometry through the beating of the short-fiber pulp also contributes to this.
  • the ground short-fiber pulp makes it possible to achieve a particularly low diffusion capacity despite the filler, and the standard deviation of the diffusion capacity also decreases.
  • the beating of the short-fiber pulp thus makes an important contribution to achieving the goals of the invention, but it is not sufficient on its own.
  • the wrapping paper according to the invention contains inorganic filler, the inorganic filler making up at least 5% and at most 45% of the mass of the wrapping paper, preferably at least 10% and at most 35% of the mass of the wrapping paper.
  • the inorganic filler is preferably selected from the group consisting of calcium carbonate, magnesium carbonate, magnesium hydroxide, aluminum oxide, aluminum hydroxide, titanium dioxide, kaolin, talc and mixtures thereof.
  • the inorganic filler is particularly preferably a precipitated calcium carbonate.
  • Inorganic filler is used in wrapping papers in the prior art, inter alia, because it gives the wrapping paper a high level of whiteness and opacity and is usually cheaper than cellulose. Therefore, attempts are made to maximize the filler content.
  • the inventors have found that a high content of filler has a negative effect on the pore structure of the wrapping paper and leads to an increase in the diffusion capacity and its standard deviation. This effect can be compensated by the ground short fiber pulp. It is known to produce wrapping papers without fillers, however, these papers have a low opacity, especially with a low diffusion capacity, so that this possibility is out of the question for the wrapping papers according to the invention.
  • the wrapping paper according to the invention has a basis weight of at least 15 g/m 2 and at most 45 g/m 2 , preferably at least 20 g/m 2 and at most 35 g/m 2 .
  • the basis weight can be measured according to ISO 536:2019. The inventors have found that if the basis weight is too low, especially if filler is present at the same time, the diffusion capacity over the surface of the wrapping paper varies more than is favorable for achieving a stable self-extinguishing rate. With a low basis weight, the wrapping paper is also thinner and is made up of only a few fiber layers. As a result, the pore structure and the diffusion capacity vary significantly across the surface.
  • a higher basis weight generally also means a lower scatter of the most varied parameters, but it also means higher material and energy consumption, so that the preferred interval according to the invention means a favorable compromise between the material and energy consumption and the properties achieved.
  • the diffusion capacity of the wrapping paper according to the invention is at least 0.05 cm/s and at most 0.5 cm/s, preferably at least 0.1 cm/s and at most 0.45 cm/s and particularly preferably at least 0. 1 cm/s and at most 0.39 cm/s.
  • the standard deviation of the diffusion capacity of the wrapping paper according to the invention is at least 0 cm/s and at most 0.05 cm/s, preferably at least 0.005 cm/s and at most 0.03 cm/s.
  • the standard deviation is determined by measuring the diffusion capacity according to CRM 77 at at least 10 randomly selected positions on the wrapping paper.
  • the interval of the diffusion capacity according to the invention and preferred is favorable in order to achieve self-extinguishing in a smoking article or to reduce its smoldering speed.
  • the specific value of the diffusion capacity to reach a certain rate of self-extinguishing or a certain smolder rate depends significantly on the construction of the smoking article and in particular on the aerosol-generating material. Although it would be desirable, it turns out that with higher diffusion capacities, the beating of the short-fiber pulp no longer has any significant effect. Apparently, the proportion of larger pores in the wrapping paper is then too high to be influenced by the particles of the ground short-fiber pulp.
  • the wrapping paper additionally be provided with discrete areas to which a film-forming composition is applied to achieve self-extinguishing of a smoking article.
  • the wrapping paper there is no need for the wrapping paper to have a low diffusion capacity.
  • the discrete areas usually have a low diffusion capacity, while the wrapping paper between the areas has a high diffusion capacity, so that the requirements according to the invention for the diffusion capacity and its standard deviation are usually not met anyway.
  • the wrapping paper therefore preferably has no discrete areas to which a film-forming composition is applied or which serve to self-extinguish a smoking article made from it.
  • a film-forming composition may contain starch, starch derivatives, cellulose derivatives, alginates or other film-forming polymers.
  • Such coatings can serve, for example, to reduce the formation of spots on the wrapping paper or to influence the ingredients of the aerosol formed in the smoking article during use. It can also serve to further reduce the diffusion capacity of the wrapping paper.
  • the air permeability is not explicitly set as a target value, but results primarily from the diffusion capacity and the composition of the wrapping paper.
  • the air permeability of the wrapping paper according to the invention is preferably at least 1 cm 3 /(cm 2 -min) and at most 25 cm 3 /(cm 2 -min) and particularly preferably at least 2 cm 3 /(cm 2 -min) and at most 20 cm 3 /(cm 2 -min).
  • the wrapping paper according to the invention can be perforated so that when the smoking article manufactured therefrom is used, air flows into the smoking article and dilutes the aerosol.
  • the wrapping paper is perforated and has an average air permeability, measured according to ISO 2965:2019 at a pressure difference of 1 kPa, of at least 50 cm 3 /(cm 2 -min) and at most 200 cm 3 /(cm 2 -min), particularly preferably at least 50 cm 3 /(cm 2 -min) and at most 150 cm 3 /(cm 2 -min).
  • the wrapping paper according to the invention can contain burnt salts, the burnt salts making up at least 0.5% and at most 2% of the mass of the wrapping paper.
  • the amount of burnt salts is particularly preferably at least 0.7% and at most 1.5% of the mass of the wrapping paper.
  • the fire salts can preferably be selected from the group consisting of citrates, malates, tartrates, acetates, nitrates, succinates, fumarates, gluconates, glycolates, lactates, oxyalates, salicylates, a-hydroxycaprylates, phosphates, polyphosphates, chlorides and hydrogen carbonates, and Mixtures thereof and more preferably from the group consisting of trisodium citrate, tripotassium citrate and mixtures thereof.
  • burn salts can affect the smoldering rate, but are also used to improve the appearance of the ash from the burned wrapping paper.
  • burn salts are often used between 2.0% and 5.0% of the mass of the wrapping paper.
  • this amount is too high to achieve a low smolder rate of the smoking article and also lowers the self-extinguishing rate.
  • the indicated and preferred interval allows a good compromise between a low smoldering rate and a good appearance of the wrapping paper ash.
  • the thickness of the wrapping paper according to the invention is preferably at least 20 ⁇ m and at most 70 ⁇ m, preferably at least 22 ⁇ m and at most 60 ⁇ m.
  • the caliper can be determined according to ISO 534:2011 on a single sheet of wrapping paper.
  • the mechanical properties of the wrapping paper according to the invention can be important for the manufacture of a smoking article from this wrapping paper.
  • the main mechanical properties include tensile strength and elongation at break, especially in the machine direction of the wrapping paper, both of which can be determined according to ISO 1924-2:2008.
  • the tensile strength of the wrapping paper according to the invention in the machine direction is preferably at least 8 N/15 mm and at most 30 N/15 mm, particularly preferably at least 10 N/15 mm and at most 25 N/15 mm Refining of the long fiber pulp required. This also increases the strength, so that the wrapping papers according to the invention usually have good strength without further measures.
  • the wrapping paper has a certain elasticity.
  • the elongation at break of the wrapping paper according to the invention in the machine direction is preferably at least 0.9% and at most 3%, particularly preferably at least 1% and at most 2%.
  • the wrapping paper is intended for use on smoking articles, which is why smoking articles comprising the wrapping paper according to the invention are also the subject matter of the invention.
  • the smoking article of the present invention comprises an aerosol generating material and the wrapping paper of the invention, the wrapping paper encasing at least a portion of the aerosol generating material and forming a cylindrical rod.
  • the smoking article according to the invention is preferably a cigarette and particularly preferably a filter cigarette.
  • the smoking article according to the invention is a smoking article in which the aerosol-generating material is only heated but not burned when used as intended.
  • the smoking article is particularly preferably intended to be electrically heated.
  • the need for the wrapping paper of the invention does not arise from achieving a low smolder rate.
  • gases in the aerosol such as oxygen, carbon dioxide or carbon monoxide.
  • the wrapping paper according to the invention can be produced according to the following method according to the invention, which comprises steps A to E, I and J:
  • a - providing an aqueous suspension of unground long fiber pulp
  • step E the amount of ground long-fiber pulp from step C is selected such that at least 15% and at most 70% of the mass of the wrapping paper in step J is formed by ground long-fiber pulp
  • step E the amount of ground short-fiber pulp from step D is chosen such that at least 5% and at most 80% of the mass of the wrapping paper in step J is formed by ground short-fiber pulp, the short-fiber pulp being ground in step D to a freeness of at least 20 °SR and at most 60 °SR is
  • step E the total amount of short-fiber pulp is chosen such that at least 10% and at most 80% of the mass of the wrapping paper in step J is formed by short-fiber pulp
  • step E the amount of inorganic filler is chosen such that at least 5% and at most 45% of the mass of the wrapping paper in step J by inorganic filler fabric are formed, and wherein when forming the fibrous web in step E, the amounts and proportions of ground long fiber pulp, ground short fiber pulp, inorgan
  • the process is monitored and adjusted to ensure that the finished wrapping paper does in fact have the desired diffusion capacity, hereinafter referred to as the "target" diffusion capacity.
  • target diffusion capacity hereinafter referred to as the "target" diffusion capacity.
  • steps E and I may include the following steps:
  • the threshold of step H is at least 0.01 cm/s and at most 0.07 cm/s.
  • the term "temporary wrapping paper" indicates that depending on the deviation from the target value of the diffusion capacity, this wrapping paper may not meet the requirements and must be sorted out. However, with sufficiently small deviations from the target value, the preliminary wrapping paper can be used for the purposes of the invention, and then forms the wrapping paper of step J, steps F and I then being combined. Note that the threshold deviation from the target value in step H, which leads to an adjustment of the manufacturing process, is usually lower than a deviation that requires the preliminary wrapping paper to be discarded. In preferred embodiments, the method is continuously adapted through the adaptation steps H.i to H.6 in such a way that the deviations in the diffusion capacity from the target value are not so large that the "provisional wrapping paper" would have to be sorted out.
  • step E is preferably selected such that at least 20% and at most 65% of the mass of the wrapping paper is formed by ground long-fiber pulp.
  • the first target value of the degree of freeness in step C is preferably at least 85°SR and at most 95°SR and particularly preferably at least 88°SR and at most 94°SR.
  • the long-fiber pulp in the context of this invention is pulp that is obtained from coniferous trees, preferably spruce, pine or fir, or from flax, hemp, jute, ramie, bamboo, abaca, sisal, kenaf or cotton. Mixtures of pulps from these sources can also be used.
  • the amount of ground short-fiber pulp in step E is preferably chosen such that at least 10% and at most 70% of the mass of the wrapping paper in step J is formed by ground short-fiber pulp.
  • the second target value of the degree of freeness in step D is preferably at least 25° SR and at most 50° SR.
  • Short-fiber pulp in the context of this invention is pulp that is obtained from deciduous trees, preferably beech, birch or eucalyptus, or from esparto grass. Mixtures of pulps from these sources can also be used.
  • the amount of short-fiber pulp in total in step E is preferably chosen such that at least 30% and at most 75% of the mass of the wrapping paper from step J is formed by short-fiber pulp.
  • the amount of inorganic filler in step E is preferably chosen such that at least 10% and at most 35% of the mass of the wrapping paper is formed by inorganic filler.
  • the inorganic filler is preferably selected from the group consisting of calcium carbonate, magnesium carbonate, magnesium hydroxide, aluminum oxide, aluminum hydroxide, titanium dioxide, kaolin, talc and mixtures thereof.
  • the inorganic filler is particularly preferably a precipitated calcium carbonate.
  • the wrapping paper from step J preferably has a basis weight of at least 20 g/m 2 and at most 35 g/m 2 .
  • the diffusion capacity of the wrapping paper from step J, measured according to CRM 77, is preferably at least 0.1 cm/s and at most 0.45 cm/s and particularly preferably at least 0.1 cm/s and at most 0.39 cm/s.
  • the standard deviation of the diffusion capacity of the wrapping paper from step J is preferably at least 0.005 cm/s and at most 0.03 cm/s.
  • the fibrous web is preferably formed in step E on a paper machine, particularly preferably on a fourdrinier paper machine.
  • a paper machine particularly preferably on a fourdrinier paper machine.
  • the person skilled in the art can choose the details of the production of a fiber web on a paper machine according to his experience.
  • the fibrous web is preferably dried in step F or step I by contact with heated cylinders, by contact with hot air, by infrared radiation or by microwave radiation.
  • the diffusion capacity in step G is preferably determined by the mean value of at least 10 measurements according to CRM 77 at randomly selected positions.
  • the threshold value in step H is preferably at least 0.02 cm/s and at most 0.05 cm/s.
  • the threshold value in step H should not be chosen too low, in particular not lower than the accuracy of the measurement of the diffusion capacity.
  • the extent to which the first setpoint for step B, the second setpoint for step C or the proportions of the pulp fibers in steps H.3 to H.6 are changed in at least one of steps H.i to H.6 can be changed by a person skilled in the art his experience, through experiments or with the help of the methods of control theory.
  • step G If the diffusion capacity measured in step G is clearly too high, it is advisable to increase the first set value for the degree of freeness in step C, step Hi, or to reduce the proportion of unground long fiber pulp, step H.3, and at the same time the proportion of ground long dissolving pulp, step H.5, because the degree of beating of the long fiber pulp has the strongest influence on the diffusion capacity.
  • the "proportion" always refers to the proportion when forming the fiber web in step E.
  • step G If the diffusion capacity measured in step G is only slightly too high, it is advisable to increase the second set value for the freeness in step D, step H.2, or to reduce the proportion of unground short fiber pulp, step H.4, and at the same time the increase the proportion of ground short fiber pulp, step H.6. In this case, it is also efficient to decrease the proportion of unrefined long-fiber pulp, step H.3, and at the same time increase the proportion of ground short-fiber pulp, step H.6.
  • the degree of beating of the short-fiber pulp has less of an effect on the diffusion capacity, but allows the diffusion capacity to be lowered even further than would be possible with beaten long-fiber pulp alone.
  • step H.6 If one wants to reduce the standard deviation of the diffusion capacity, then it is favorable to increase the proportion of ground short-fiber pulp, step H.6, and at the same time to lower the proportion of ground long-fiber pulp, step H.5. It may also be necessary to adjust the first or second set value of the freeness, step H.i or step H.2.
  • Step H is preferably the implementation of a combination of two of steps H.i to H.6 if the absolute difference between the diffusion capacity measured in step G and the target value of the diffusion capacity exceeds the threshold value.
  • Step H is particularly preferably the implementation of at least one of the following combinations of two of steps H.3 to H.6: H.3 and H.5; H.4 and H.5; H.6 and H.5; H.4 and H.6; H.3 and H.6 if the absolute difference between the diffusion capacity measured in step G and the target diffusion capacity exceeds the threshold.
  • Step H is very particularly preferably the implementation of a combination of three of steps H.i to H.6 if the absolute difference between the diffusion capacity measured in step G and the target value of the diffusion capacity exceeds the threshold value.
  • step H is performing at least one of the following combinations of three of steps Hi through H.6: Hi, H.3 and H.5; H.2, H.3 and H.5; Hi, H.4 and H.5; H.2, H.4 and H.5; Hi, H.6 and H.5; H.2, H.6 and H.5; Hi, H.4 and H.6; H.2, H.4 and H.6; Hi, H.3 and H.6; H.2, H.3 and H.6 if the absolute difference between the diffusion capacity measured in step G and the target value of the diffusion capacity exceeds the threshold.
  • the removal of the wrapping paper in step J preferably includes rolling it up on a roll or cutting the wrapping paper into bobbins of a defined width.
  • a number of wrapping papers according to the invention were produced according to the method according to the invention.
  • the composition of the wrapping papers is given in Table 1, where “LF” is the content of ground long-fiber pulp based on the mass of the wrapping paper, “SF-U” is the content of unground short-fiber pulp based on the mass of the wrapping paper, “SF-R” the content of ground short-fiber pulp in relation to the mass of the wrapping paper, “FI” the content of inorganic filler in relation to the mass of the wrapping paper, “DR-L” the freeness of the ground long-fiber pulp, “DR-S” the freeness of the ground short-fiber pulp, “ BW” is the basis weight, “MW” is the mean diffusing capacity and “SD” is the standard deviation of the diffusing capacity.
  • All wrapping papers according to the invention from Table 1 each contained 0.5% to 1.5% citrate as burnt salt, based on the mass of the wrapping paper.
  • the entire proportion of long-fiber pulp was formed by ground long-fiber pulp.
  • the wrapping papers 1 to 9 according to the invention show that a very low standard deviation of the diffusion capacity can be achieved over a certain range with regard to basis weight, the content of ground long-fiber pulp, ground and unground short-fiber pulp and the filler content. Intensive beating of all of the long-fiber pulp brought the diffusion capacity down to a low level, and the specific value of the diffusion capacity was primarily set by mixing ground and unground short-fiber pulp. Due to the natural variability of the raw materials, this ratio had to be adjusted individually for each production batch.
  • the wrapping paper 9 according to the invention with a content of unground short-fiber pulp of only 9% of the mass of the wrapping paper shows a significantly higher standard deviation in the diffusion capacity compared to the wrapping papers 1-7, so that the limits of the invention are approached here.
  • the wrapping paper 8 according to the invention also roughly shows the limits of the invention, in particular in comparison to the wrapping paper 7.
  • the main difference lies in the diffusion capacity, which is slightly higher for wrapping paper 8 at 0.44 cm/s than for wrapping paper 7 at 0. 39 cm/s. Apparently, the effect of the ground short-fiber pulp decreases from this diffusion capacity, so that the standard deviation of the diffusion capacity can no longer be reduced as efficiently.
  • the filler content is chosen to be rather low. If you want to increase the filler content, for example up to 40% or 45% of the mass of the wrapping paper, then it is favorable to increase the degree of beating of the short-fiber pulp and also to increase the proportion of ground short-fiber pulp and to reduce the proportion of unground short-fiber pulp.
  • Comparative example A which is not according to the invention, is very similar to wrapping paper 5 according to the invention, but has a higher basis weight of 48 g/m 2 and contains no ground short-fiber pulp. It can be seen that the standard deviation of the diffusion capacity in comparative example A is significantly higher than in wrapping paper 5, but is in an acceptable range, so that ground short-fiber pulp is no longer required at this high basis weight.
  • comparative example B which is not according to the invention, no ground short-fiber pulp was used and despite the otherwise almost identical properties to the wrapping paper 2 according to the invention, it is not possible to reduce the diffusion capacity sufficiently and the standard deviation of the diffusion capacity is more than twice as high.
  • comparative example C which is not according to the invention, shows that a wrapping paper that consists exclusively of ground long-fiber pulp and filler can achieve a low diffusion capacity, but the standard deviation of the diffusion capacity is too high. This is brought about by the proportion of filler and can, as the approximately similar example 4 shows, be compensated for by the use of ground short-fiber cellulose.

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  • Inorganic Chemistry (AREA)
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Abstract

L'invention concerne un papier d'enrobage pour un article à fumer, ledit papier d'enrobage comprenant de la pâte à fibres longues, de la pâte à fibres courtes et une charge inorganique ; au moins une partie de la pâte à fibres longues étant broyée et la pâte à fibres longues broyée représentant au moins 15 % et au plus 70 % de la masse du papier d'enrobage ; au moins une partie de la pâte à fibres courtes étant broyée et la pâte à fibres courtes broyée représentant au moins 5 % et au plus 80 % de la masse du papier d'enrobage ; et la pâte à fibres courtes broyée présentant un degré de broyage d'au moins 20° SR et d'au plus de 60° SR, la pâte à fibres courtes dans sa totalité constituant au moins 10 % et au plus 80 % de la masse du papier d'enrobage ; au moins 5 % et au plus 45 % de la masse du papier d'enrobage étant formée par une ou plusieurs charges inorganiques, la masse surfacique du papier d'enrobage étant d'au moins 15 g/ m2 et d'au plus 45 g/ m2 ; la capacité de diffusion du papier d'enrobage étant d'au moins 0,05 cm/s et d'au plus 0,5 cm/s ; et l'écart-type de la capacité de diffusion du papier d'enrobage étant au maximum de 0,05 cm/s. L'invention concerne également un procédé de fabrication associé et un article à fumer dans lequel ledit papier d'enrobage est utilisé.
EP22706041.5A 2021-02-22 2022-02-16 Papier d'enrobage amélioré à faible capacité de diffusion Pending EP4294979A1 (fr)

Applications Claiming Priority (2)

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DE102021104160.0A DE102021104160A1 (de) 2021-02-22 2021-02-22 Verbessertes umhüllungspapier mit niedriger diffusionskapazität
PCT/EP2022/053727 WO2022175292A1 (fr) 2021-02-22 2022-02-16 Papier d'enrobage amélioré à faible capacité de diffusion

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EP (1) EP4294979A1 (fr)
CN (1) CN117062950A (fr)
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WO (1) WO2022175292A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD145863A3 (de) * 1977-04-20 1981-01-14 Ottfried Riessner Verfahren zur herstellung von ziga ettenpapier
TWI243652B (en) * 2003-04-14 2005-11-21 Japan Tobacco Inc Improved low fire-spreading cigarette
DE102010013669A1 (de) 2010-04-01 2011-10-06 Delfortgroup Ag Perforiertes Zigarettenpapier
US9640802B2 (en) 2010-10-26 2017-05-02 Ford Global Technologies, Llc Catalyst assembly and method of making the same
ES2421621T3 (es) 2011-07-28 2013-09-04 Delfortgroup Ag Papel de envoltura de filtro resistente al aceite
EP2617299A1 (fr) 2012-01-18 2013-07-24 Delfortgroup AG Papier rempli de particules de tabac
DE102015105882B4 (de) 2015-04-17 2017-06-08 Delfortgroup Ag Umhüllungspapier mit hohem Kurzfaseranteil und Rauchartikel
DE102018118271A1 (de) * 2018-07-27 2020-01-30 Delfortgroup Ag Leichtes trennbasispapier
GB201904890D0 (en) 2019-04-05 2019-05-22 British American Tobacco Investments Ltd Smoking article

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US20240122231A1 (en) 2024-04-18
DE102021104160A1 (de) 2022-08-25
CN117062950A (zh) 2023-11-14

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