EP4176128A1 - Papier d'emballage résistant à la chaleur pour articles de génération d'aérosol - Google Patents

Papier d'emballage résistant à la chaleur pour articles de génération d'aérosol

Info

Publication number
EP4176128A1
EP4176128A1 EP21728017.1A EP21728017A EP4176128A1 EP 4176128 A1 EP4176128 A1 EP 4176128A1 EP 21728017 A EP21728017 A EP 21728017A EP 4176128 A1 EP4176128 A1 EP 4176128A1
Authority
EP
European Patent Office
Prior art keywords
wrapping paper
aerosol
fibers
carbon
mass
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.)
Granted
Application number
EP21728017.1A
Other languages
German (de)
English (en)
Other versions
EP4176128B1 (fr
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 EP4176128A1 publication Critical patent/EP4176128A1/fr
Application granted granted Critical
Publication of EP4176128B1 publication Critical patent/EP4176128B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/34—Ignifugeants
    • 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
    • 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
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/10—Phosphorus-containing compounds
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments

Definitions

  • the invention relates to a wrapping paper for an aerosol-generating article, which is comparatively heat-resistant and therefore has sufficient mechanical strength after use of the article to ensure problem-free handling of the article and also has a fire-retardant effect, so that the aerosol-generating article made from it does not like a smoking article can be smoked. This is achieved through a high Ge content of certain carbon formers in the wrapping paper.
  • aerosol generating articles which comprise an aerosol generating material and a paper which wraps the aerosol generating material to form a typically cylindrical rod.
  • the aerosol-generating material is a material that releases an aerosol when exposed to heat, the aerosol-generating material only being heated but not burned.
  • the aerosol-generating article also comprises a filter which can filter components of the aerosol and which is wrapped by a filter wrapping paper and another wrapping paper which connects the filter and the wrapped rod with aerosol-generating material to one another.
  • the aerosol-generating material When an aerosol-generating article is used as intended, it is common for the aerosol-generating material to be heated but not incinerated. This heating can be done, for example, by an external device into which the aerosol-generating article is inserted, or by a heat source attached to one end of the aerosol-generating article, which is put into operation for use of the article, for example by lighting it up.
  • the wrapping paper When the aerosol-generating material is heated up, the wrapping paper is also heated and thermally degraded. It can happen that the wrapping paper loses so much strength that it tears when the aerosol-generating article is removed from the heater. This requires an increased cleaning effort by the consumer and is therefore not desirable.
  • the wrapping paper can lose its strength when heated, so that the heat source falls off and poses a fire risk.
  • the wrapping material of the aerosol-generating article has fire-retardant properties.
  • a wrapping paper which consists of comparatively few cellulose fibers and is coated with a composition of lime and a binder, so that at least 50% of the wrapping paper is formed by lime.
  • the disadvantage of this wrapping material is that it is comparatively brittle due to the thick coating and generates a lot of dust when the wrapping paper is processed into an aerosol-generating article.
  • the strength is not particularly high.
  • WO 2011/117750 a wrapping material is described which consists of a laminate of an aluminum foil and a paper.
  • the aluminum foil faces the aerosol generating material and partially protects the paper from the effects of heat.
  • the disadvantages of this wrapping material are the complex manufacturing process and the lack of biodegradability, because experience has shown that many aerosol-generating articles are simply disposed of in the environment after use.
  • aerosol-generating articles are rod-shaped articles which comprise an aerosol-generating material and a wrapping paper which wraps the aerosol-generating material, with the aerosol-generating material only being heated and not burned when used as intended.
  • Typical aerosol-generating materials for example tobacco, are heated without combustion if the aerosol-generating material is heated to a temperature of at most 400.degree.
  • the high proportion of cellulose fibers is necessary in order to achieve a high initial strength of the wrapping paper. It is known that many carbon formers that could potentially be used in paper damage the cellulose fibers in the paper and thus quickly lead to a severe loss of strength when heated. However, they partially protect the cellulose fibers that are still in the paper structure from thermal degradation. Since paper is generally highly flammable, it is common opinion that carbon formers must be used in a very high concentration in paper for an effective, fire-retardant effect. In this concentration, however, according to popular opinion and also according to the inventors' experiments, the cellulose fibers are so severely damaged and the strength of the paper is reduced so much that their use is not sensible. In contrast to this, the inventors have recognized that with a few carbon formers there is actually a suitable narrow concentration range in which there is both a good fire-retardant effect and the reduction in the strength of the paper is not too great.
  • the components of the wrapping paper also allow excellent biodegradability and very good processability in the manufacture of the aerosol-generating article.
  • the wrapping paper requires cellulose fibers for its strength, the cellulose fibers making up at least 70% and at most 95% of the weight of the wrapping paper.
  • the proportion of cellulose fibers can preferably be at least 75% and at most 90% and most preferably at least 80% and at most 90%, each based on the weight of the wrapping paper.
  • the pulp fibers are preferably obtained from one or more plants that are selected from the group consisting of conifers, deciduous trees, spruce, pine, fir, beech, birch, eucalyptus, flax, hemp, jute, ramie, abaca, sisal, and kenaf Cotton.
  • the cellulose fibers can also be wholly or partly fibers made from regenerated cellulose, such as Tencel TM fibers, Lyocell TM fibers, viscose fibers or Modal TM fibers.
  • the pulp fibers are preferably formed to a proportion of at least 40% and at most 100% based on the mass of the pulp fibers from pulp fibers from conifers, because these pulp fibers give the wrapping paper a high level of strength.
  • the wrapping paper contains a carbon former, the carbon former making up at least 5% and at most 20% of the weight of the wrapping paper.
  • the carbon former protects the cellulose fibers inside the paper structure excessive oxidation, but also damages the cellulose fibers themselves, so that the concentration of the carbon former must be within a narrow range and depends on the type of carbon former. As the concentration of the carbon former increases, the fire-retardant effect increases, but the strength of the wrapping paper after heating decreases again due to increasing damage to the cellulose fibers.
  • the proportion of carbon formers in the wrapping paper is therefore preferably at least 9% and at most 16% of the mass of the wrapping paper.
  • the carbon former is preferably an ammonium phosphate and particularly preferably a mono ammonium phosphate, a diammonium phosphate, a triammonium phosphate, an ammonium polyphosphate or a mixture thereof.
  • the carbon former is less preferably a guanylurea phosphate, guanidine phosphate, phosphoric acid, a phosphonate, melamine phosphate, dicyandiamide, boric acid or borax. These less preferred compounds are more difficult to process or toxicologically not entirely unthinkable.
  • Sodium polyphosphate is also a carbon former, but not according to the invention.
  • the choice of the concentration of the carbon former is not free within the specified interval, but depends on the type of carbon former and must be made so that the reduction in the strength of the wrapping paper after heating is not too high.
  • the tensile strength of the wrapping paper in the longitudinal direction is determined as a characteristic feature of the strength and is determined first under the conditions of ISO 187: 1990 and then after the wrapping paper has been heated. More specifically, the loss of strength can be determined by the following method.
  • a paper sample of the appropriate geometry is conditioned in accordance with ISO 187: 1990 and tested in a tensile test in accordance with ISO 1924-2: 2008.
  • the tensile strength depends on the direction in which the paper sample was taken.
  • tensile strength is always understood to mean the tensile strength in the running direction of the wrapping paper during papermaking, the so-called longitudinal direction.
  • the initial tensile strength is determined according to the invention by conditioning the paper sample without prior thermal loading according to ISO 187: 1990 and testing it according to ISO 1924-2: 2008.
  • the tensile strength after thermal loading, R T is determined by exposing the sample to a temperature of 230 ° C. for 1 minute in an air atmosphere, during which the air can reach essentially all sides of the paper sample and there is little air flow. The paper sample is then conditioned in accordance with ISO 187: 1990 and the tensile strength is also determined in accordance with ISO 1924-2: 2008.
  • the quotient r R T / R 0 describes what proportion of the tensile strength after the thermal Loading of the wrapping paper is retained and thus characterizes the thermal resistance of the wrapping paper. High values of the quotient r describe a high thermal resistance.
  • the concentration of the carbon former in the wrapping paper should be chosen so that the quotient r of the tensile strength RT after thermal loading (230 ° C for 1 minute) and the initial tensile strength R 0 is at least 0.20 and at most 0.90 and particularly preferred at least 0.25 and at most 0.80. This means that the tensile strength will not be reduced by more than 80%.
  • the quotient can be influenced by the amount of cellulose fibers and the type and concentration of the carbon former, with more cellulose fibers leading to a higher initial tensile strength R 0 and an increasing concentration of the carbon former generally leading to a decreasing tensile strength after thermal loading R T.
  • the negative effect of the carbon former on the tensile strength RT must be weighed against the fire-retardant effect, which increases with increasing concentration, depending on the type of use on the aerosol-generating article. It has been shown that in the interval according to the invention and preferred for the concentration of the carbon former, a very good compromise can be found for aerosol-generating articles.
  • the tensile strength RT should preferably not fall below a certain value after thermal exposure so that problem-free handling of the aerosol-generating article is possible during and after use.
  • the tensile strength of the wrapping paper RT in the longitudinal direction after thermal loading is therefore preferably at least 8 N / 15 mm and at most 50 N / 15 mm and particularly preferably at least 10 N / 15 mm and at most 40 N / 15 mm.
  • the wrapping paper is designed so that the side of the wrapping paper facing the aerosol-generating material contains a higher proportion of carbon formers than the other side of the wrapping paper.
  • the side facing the aerosol-generating material is typically exposed to higher thermal loads. A higher content of carbon formers on this side of the wrapping paper can therefore contribute particularly well to the fire-retardant effect.
  • the proportion of carbon formers in the wrapping paper can be reduced without sacrificing the fire-retardant effect and thus the proportion of cellulose fibers in the wrapping paper can be increased with the same weight per unit area, which increases the overall strength of the wrapping paper.
  • this preferred distribution of the carbon former in the Wrapping paper also reduces the weight per unit area without sacrificing the fire-retardant effect, which reduces the material requirement.
  • the distribution of the carbon former in the wrapping paper can be influenced by the manufacturing process, as will be explained further below.
  • the carbon former is preferably distributed essentially evenly over at least 70% of the area of the wrapping paper, particularly preferably over at least 95% of the area, where fluctuations in the proportion of the carbon former within these areas are only due to the manufacture but not intended.
  • a disadvantage of the carbon former can be that it discolors the wrapping paper when it is exposed to heat.
  • This disadvantage can be overcome in that the wrapping paper according to the invention is connected to another paper layer, for example glued, so that the wrapping paper according to the invention faces the aerosol-generating material and the additional paper layer is attached to the side facing away from the aerosol-generating material. In the event of thermal stress, this further paper layer covers the wrapping paper so that the color visible from the outside is not or only insignificantly changed.
  • the wrapping paper is therefore preferably connected to a paper layer.
  • This paper layer particularly preferably comprises cellulose fibers and lime particles, the lime particles making up at least 15% and at most 40% of the mass of the paper layer.
  • the lime particles ensure a white color of the paper layer and a high opacity, so that the discoloration of the wrapping paper according to the invention underneath is not or only slightly visible.
  • the wrapping paper with the additional paper layer as a whole could in principle also be referred to as “two-layer wrapping paper”, but this nomenclature is avoided here.
  • such a two-ply structure is referred to as "wrapping paper with additional paper layer" because only the portion of the two-ply structure designated by “wrapping paper” has to meet the above requirements with regard to the proportion of cellulose fibers, carbon formers and the quotient of the tensile strengths .
  • the wrapping paper according to the invention can contain further components. These include, for example, fillers, sizing agents, wet strength agents, additives, processing aids, humectants and flavorings. Those skilled in the art can choose these components according to their experience.
  • Wet strength medium in particular can be helpful for use on aerosol-generating articles because that aerosol formed when the aerosol generating article is used has a high moisture content.
  • the wrapping paper can partially absorb the water from the aerosol, which reduces its strength. This can be prevented by using wet strength agents.
  • the fillers in the wrapping paper according to the invention can contribute to the fact that the wrapping paper is less discolored. However, the fillers also reduce the tensile strength of the wrapping paper, so that their proportion should not be too high.
  • the proportion of fillers in the wrapping paper is therefore preferably at least 0% and at most 20%, particularly preferably at least 0% and at most 10% and very particularly preferably at least 0% and at most 5%, each based on the weight of the wrapping paper.
  • the filler is preferably selected from the group consisting of calcium carbonate, magnesium carbonate, titanium dioxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, kaolin, talc and mixtures thereof.
  • the filler is less preferably a carbonate.
  • the wrapping paper additionally contains starch or a starch derivative or is coated with starch or a starch derivative.
  • the proportion of starch or the starch derivative is at least 2% and at most 10% of the weight of the wrapping paper.
  • the aerosol-generating material can contain oils, for example flavorings, which, when the aerosol-generating article is stored or used, penetrate the wrapping paper and lead to stains.
  • the resistance to the penetration of oils can be determined according to TAPPI T559 cm-12 and is specified as the KIT level.
  • the KGG level is at least 4 and at most 8.
  • the weight per unit area of the wrapping paper can vary, a higher area weight generally also meaning a higher tensile strength. With a higher basis weight, however, the wrapping paper also becomes stiffer and more difficult to process, and the need for material increases.
  • the weight per unit area of the wrapping paper according to the invention is therefore preferably at least 15 g / m 2 and at most 80 g / m 2 , particularly preferably at least 20 g / m 2 and at most 60 g / m 2 .
  • the basis weight of the wrapping paper can be determined according to ISO 536: 2019.
  • the thickness of the wrapping paper mainly influences the flexural rigidity and the heat transport within the wrapping paper.
  • a high level of flexural rigidity is beneficial because the aerosol-generating article made from the wrapping paper then becomes less susceptible to damage. forms, on the other hand, high flexural rigidity can cause problems because of the restoring forces when the aerosol-generating material is to be wrapped with the wrapping paper.
  • a high thickness slows down the heat transport through the wrapping paper and is also favorable for this reason.
  • the thickness of the wrapping paper according to the invention is preferably at least 25 ⁇ m and at most 100 ⁇ m and particularly preferably at least 40 ⁇ m and at most 80 ⁇ m. The thickness can be determined on a single layer according to ISO 534: 2011.
  • the initial tensile strength R 0 of the wrapping paper measured in the longitudinal direction, is preferably at least 10 N / 15 mm and at most 100 N / 15 mm, particularly preferably at least 20 N / 15 mm and at most 80 N / 15 mm a high proportion of cellulose fibers can be achieved. However, this also means higher material costs, which is why it does not make sense to want to achieve a particularly high tensile strength.
  • the preferred intervals allow a particularly favorable combination of problem-free processability and material expenditure.
  • the tensile strength can be determined according to ISO 1924-2: 2008.
  • the aerosol-generating material often contains humectants, so that when heated, the aerosol produced has a comparatively high level of humidity. This moisture can reduce the strength of the wrapping paper, which is why it is advantageous if the wrapping paper also has a corresponding strength in the moist state.
  • the wet tensile strength in the longitudinal direction is therefore preferably at least 1 N / 15 mm and at most 10 N / 15 mm and particularly preferably at least 2 N / 15 mm and at most 8 N / 15 mm ⁇
  • the wet tensile strength in the longitudinal direction can according to ISO 12625-5: 2016 to be determined.
  • the air permeability of the wrapping paper can be low.
  • a low air permeability is often achieved by grinding the cellulose fibers more intensively. This also contributes to an increase in strength, so that the air permeability is preferably at least o cm 3 / (cm 2 -min-kPa) and at most 50 cm 3 / (cm 2 -min-kPa) and particularly preferably at least o cm 3 / ( cm 2 -min-kPa) and a maximum of 20 cm 3 / (cm 2 -min-kPa).
  • the air permeability can be measured according to ISO 2965: 2019.
  • the optical properties can be important. In general, high opacity and high whiteness are desirable. Both properties can be significantly influenced by the type and amount of filler in the wrapping paper.
  • the opacity is preferably at least 40% and at most 90%, particularly preferably at least at least 45% and at most 80%.
  • the whiteness is preferably at least 80% and at most 95%, particularly preferably at least 83% and at most 90%.
  • Aerosol-generating articles can be manufactured from the wrapping material according to the invention by methods known from the prior art.
  • An aerosol-generating article according to the invention therefore comprises an aerosol-generating material and a wrapping paper according to one of the embodiments described above, the wrapping paper wrapping the aerosol-generating material.
  • the proportion of said carbon-forming agent is higher on one side of the wrapping paper than on the other side and the side with the higher proportion of carbon-forming agent faces the aerosol-generating material.
  • the wrapping paper according to the invention can advantageously be used in aerosol-generating articles, which is why the use of the wrapping paper according to the invention in aerosol-generating articles is also an object of the invention.
  • the wrapping paper according to the invention can be produced by the following process according to the invention, comprising steps A to G.
  • the step of applying the composition containing the carbon former to the fiber web is preferably carried out by one or a combination of two or more of the following steps:
  • F.3 one-sided application of a composition containing carbon formers to the fiber web by printing, in particular gravure printing or spraying.
  • Step F.i is carried out in a size press and the fiber web is soaked with a composition containing carbon formers.
  • This variant has the advantage that it is easy to implement. It generally leads to a largely homogeneous distribution of the carbon former over the thickness of the wrapping paper, so that comparatively more carbon former is required to achieve the desired effect. But it is also possible to adjust the settings of the size press in this step so that the carbon former is unevenly distributed over the thickness of the fiber web, and therefore of the wrapping paper.
  • step F.2 the composition containing carbon formers is applied to one side of the fiber web in a film press or in a coating unit. This results in an uneven distribution of the carbon former over the thickness of the wrapping paper and the high fire-retardant effect can be achieved by a lower proportion of carbon former in the wrapping paper.
  • step F.3 the composition containing carbon formers is applied to one side of the fiber web by printing or spraying, the composition in particularly preferred embodiments being printed onto one side of the fiber web by a gravure printing unit.
  • the fiber web is preferably dried, rolled up and unrolled again before step F.3. In the rolled state, the fiber web can then be transported to a further device on which the composition is applied by printing or spraying. While steps Fi and F.2 are usually carried out on the same paper machine on which the wrapping paper is produced, the order according to step F.3 typically takes place in a separate device.
  • steps Fi and F.3 are combined so that initially in a step Fi the fiber web is impregnated with a carbon-forming composition in a size press and in step F.3 a further carbon-forming composition is soaked in a gravure printing unit is printed on one side of the fiber web.
  • the carbon former is both distributed in the wrapping paper and also present in a higher concentration on one side of the wrapping paper, whereby the fire-retardant effect can be increased again significantly.
  • steps F.i and F.2 are combined, step F.i being carried out in a size press and step F.2 being carried out in a coating unit.
  • the wrapping paper can be produced particularly efficiently because, for example, all application devices can be integrated into a paper machine.
  • the composition containing carbon formers is preferably applied to at least 70% of the area of the wrapping paper, particularly preferably to at least 95% of the area of the wrapping paper .
  • the composition which is used in steps F.i, F.2 or F.3 contains the carbon former and a solvent, the solvent being preferably water.
  • the amount of carbon former in the composition can vary and depends on the type of application method, the amount applied and the desired amount of carbon former in the wrapping paper. The person skilled in the art is able to determine a suitable composition from these points of view and to design the application process accordingly.
  • steps Fi and F.2 are carried out, the fiber web is then dried, rolled up and unrolled again, and then step F.3 is carried out, the fiber web in the dried, rolled-up state before step F.3 Carbon formers preferably in an amount of at least 5% and at most 10% of the mass of the fiber web in this dried, rolled-up state.
  • steps F.i, F.2 and / or F.3 are combined in any form, the compositions containing carbon formers which are applied in steps F.i, F.2 and / or F.3 can be different.
  • the cellulose fibers make up at least 70% and at most 95% of the mass of the wrapping paper.
  • the proportion of cellulose fibers can be preferably at least 75% and at most 90% and very particularly preferably at least 80% and at most 90%, in each case based on the mass of the wrapping paper according to step G.
  • the pulp fibers in step A are preferably obtained from one or more plants selected from the group consisting of conifers, deciduous trees, spruce, foie re, fir, beech, birch, eucalyptus, flax, hemp, jute, ramie, abaca, sisal , Kenaf and cotton.
  • the cellulose fibers can also be wholly or partly fibers made from regenerated cellulose, such as Tencel TM fibers, Lyocell TM fibers, viscose fibers or Modal TM fibers.
  • the pulp fibers in step A are at least 40% and at most 100% based on the mass of the pulp fibers from pulp fibers from pine trees, because these pulp fibers give the wrapping paper in step G a high initial strength.
  • the wrapping paper after step G contains carbon formers, the carbon formers making up at least 5% and at most 20% of the mass of the wrapping paper.
  • the proportion of carbon former in the wrapping paper after step G is preferably at least 9% and at most 16% of the mass of the wrapping paper.
  • the carbon former is preferably an ammonium phosphate and particularly preferably a mono ammonium phosphate, a diammonium phosphate, a triammonium phosphate, an ammonium polyphosphate or a mixture thereof.
  • the carbon former is less preferably a guanylurea phosphate, guanidine phosphate, phosphoric acid, a phosphonate, melamine phosphate, dicyandiamide, boric acid or borax. These less preferred compounds are more difficult to process or toxicologically not entirely unthinkable.
  • Sodium polyphosphate is also a carbon former, but not according to the invention.
  • the wrapping paper after step G is a wrapping paper according to one of the embodiments described above.
  • a wrapping paper Pi according to the invention was produced on a Fourdrinier paper machine.
  • cellulose fibers were suspended in water (step A) and ground in a grinding unit (step B).
  • the suspension was then applied to a rotating sieve (step C) and dewatered there in order to form a fiber web (step D).
  • the fiber web was pressed (step E) in order to dewater it further and dried by contact with heated drying cylinders (step F).
  • step Fi a composition comprising water and monoammonium phosphate
  • the fiber web was then dried by contact with heated drying cylinders.
  • the fiber web was rolled up (step G) and a wrapping paper Pi according to the invention was thus obtained.
  • the amount of cellulose fibers was chosen so that the wrapping paper Pi contained about 87% of the mass of cellulose fibers.
  • the composition in step F.i comprised water and monoammonium phosphate and was chosen together with the settings of the size press so that the amount of monoammonium phosphate in the wrapping paper after step G was about 7%. It can be assumed that the distribution of the mono ammonium phosphate in the wrapping paper Pi was largely homogeneous over the thickness.
  • a wrapping paper P2 according to the invention was produced from the wrapping paper Pi according to the invention by unrolling the roll of wrapping paper Pi again and printing a composition comprising water and monoammonium phosphate over the entire surface in a gravure printing unit on one side of the wrapping paper (step F.3).
  • the wrapping paper was then dried in a hot air dryer and rolled up again (step G).
  • the composition in step F.3 was chosen together with the settings of the gravure printing unit and in particular the geometry of the printing cylinder so that in the finished wrapping paper P2 a total of 12.5% of the mass of the wrapping paper was formed by monoammonium phosphate. This resulted in an inhomogeneous distribution of the monoammonium phosphate in the wrapping paper, so that the content of monoammonium phosphate was higher on the printed side than on the other side.
  • a wrapping paper Zi not according to the invention comprising 70% cellulose fibers and 29% precipitated lime, but without carbon formers, was used as a comparative example.
  • a wrapping paper Z2 not according to the invention comprising 90% pulp fibers and 10% sodium polyphosphate, (NaP0 3 ) n , was used as a carbon former as a comparative example.
  • the wrapping paper Zi not according to the invention was bonded to the wrapping paper P2 according to the invention to form a two-layer structure so that the side of the wrapping paper P2 with the higher monium phosphate content was facing away from the wrapping paper Zi.
  • the wrapping papers Pi, P2, P3 and Zi, Z2 were stored in a drying cabinet heated to 230 ° C. for 1 minute. They were then conditioned according to ISO 187: 1990 and the tensile strength measured according to ISO 1924-2: 2008.
  • the quotient r R T / R 0 was determined from the initial tensile strength R 0 and the tensile strength R T after thermal loading in order to characterize the thermal resistance.
  • Table 1 shows that with the wrapping papers Pi and P2 according to the invention, as well as with the two-layer structure P3 containing the wrapping paper P2 according to the invention, the tensile strength is reduced to 34% to 55% by the thermal load.
  • the tensile strength is hardly reduced by the thermal load and is still about 94% of the initial tensile strength.
  • the wrapping papers Pi and P2 according to the invention and the two-ply structure P3 all show an acceptable decrease in tensile strength.
  • the higher content of monoammonium phosphate in the wrapping paper P2 damages the fibers more and reduces the tensile strength to a greater extent after thermal stress.
  • the fire-retardant effect is also important.
  • the wrapping papers P1 / P2 according to the invention, the two-layer structure P3 and the comparative examples Zi and Z2 not according to the invention were used to produce aerosol-generating articles which were intended for use with a heater.
  • the manufacture of the aerosol generating articles was problem-free for all wrapping papers.
  • the comparative example Zi not according to the invention had no fire-retardant effect.
  • the aerosol-generating articles with the wrapping papers P1 / P2 according to the invention could not be ignited in such a way that a combustion or a stable smoldering process started. It was also not possible to smoke these aerosol-generating articles in a standardized process.
  • the wrapping paper P2 according to the invention turned out to be somewhat better than Pi, which shows that an uneven distribution of the carbon-forming agent over the thickness of the wrapping paper can contribute to increasing the fire-retardant effect.
  • the two-layer structure P3 was a laminate of the wrapping paper P2 according to the invention and the comparative example Zi not according to the invention and showed after use of the aerosol-generating article manufactured therefrom has a significantly lower discoloration than the aerosol-generating articles with Pi and P2.
  • the wrapping paper Zi thus fulfilled its function of masking the discoloration of the wrapping paper P2. Influences on the taste of the aerosol-generating articles could not be determined.
  • the wrapping papers according to the invention are therefore very well suited for use in aerosol generating articles and have good biodegradability after heating and a better combination of strength and fire-retardant action than comparable wrapping papers from the prior art.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Abstract

L'invention concerne un papier d'emballage qui est apte à être utilisé sur des articles de génération d'aérosol et qui comprend des fibres de pâte à papier et une substance formant du charbon, les fibres de pâte à papier constituant entre 70% et 95% de la masse du papier d'emballage et la substance formant du charbon étant présentes dans une concentration comprise entre 5% et 20% par rapport à la masse du papier d'emballage et étant présent dans le papier d'emballage à une concentration telle que le quotient r = RT/R0, où R0 est la résistance à la traction mesurée selon la norme ISO 1924-2:2008 dans des conditions de norme ISO 187:1990 et RT est la résistance à la traction mesurée selon ISO 1924-2:2008 dans des conditions de norme ISO 187:1990, est comprise entre 0,20 et 0,90 après l'exposition du papier d'emballage à une température de 230°C pendant une minute.
EP21728017.1A 2020-07-01 2021-05-18 Papier d'emballage résistant à la chaleur pour articles générant des aérosols Active EP4176128B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020117368 2020-07-01
PCT/EP2021/063133 WO2022002477A1 (fr) 2020-07-01 2021-05-18 Papier d'emballage résistant à la chaleur pour articles de génération d'aérosol

Publications (2)

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EP4176128A1 true EP4176128A1 (fr) 2023-05-10
EP4176128B1 EP4176128B1 (fr) 2024-04-24

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EP21728017.1A Active EP4176128B1 (fr) 2020-07-01 2021-05-18 Papier d'emballage résistant à la chaleur pour articles générant des aérosols

Country Status (8)

Country Link
US (1) US20230250590A1 (fr)
EP (1) EP4176128B1 (fr)
JP (1) JP2023532249A (fr)
KR (1) KR20230029814A (fr)
CN (1) CN115943234A (fr)
BR (1) BR112022026328A2 (fr)
DE (1) DE102020131672A1 (fr)
WO (1) WO2022002477A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3905902A1 (fr) * 2019-01-04 2021-11-10 Nicoventures Trading Limited Génération d'aérosol

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4998543A (en) * 1989-06-05 1991-03-12 Goodman Barbro L Smoking article exhibiting reduced sidestream smoke, and wrapper paper therefor
US6314964B1 (en) * 1999-09-15 2001-11-13 Schweitzer-Mauduit International, Inc. Cigarette paper containing carbon fibers for improved ash characteristics
UA107962C2 (en) 2010-03-26 2015-03-10 Philip Morris Products Sa Smoking accessories with heat-resistant sheet materials
UA119333C2 (uk) 2013-12-05 2019-06-10 Філіп Морріс Продактс С.А. Нагрівний виріб, що генерує аерозоль, з теплорозподілювальною обгорткою
DE102015105882B4 (de) * 2015-04-17 2017-06-08 Delfortgroup Ag Umhüllungspapier mit hohem Kurzfaseranteil und Rauchartikel
DE102016105235B4 (de) * 2016-03-21 2019-02-14 Delfortgroup Ag Verbessertes Filterpapier für Zigarettenfilter, dessen Herstellung und Filterzigarette

Also Published As

Publication number Publication date
BR112022026328A2 (pt) 2023-01-17
JP2023532249A (ja) 2023-07-27
US20230250590A1 (en) 2023-08-10
CN115943234A (zh) 2023-04-07
KR20230029814A (ko) 2023-03-03
WO2022002477A1 (fr) 2022-01-06
EP4176128B1 (fr) 2024-04-24
DE102020131672A1 (de) 2022-01-05

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