Classifications

• • 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
  • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
  • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
  • A24C5/01—Making cigarettes for simulated smoking devices
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D1/00—Cigars; Cigarettes
  • A24D1/02—Cigars; Cigarettes with special covers
  • A24D1/027—Cigars; Cigarettes with special covers with ventilating means, e.g. perforations
• • 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
  • A24D1/04—Cigars; Cigarettes with mouthpieces or filter-tips
  • A24D1/045—Cigars; Cigarettes with mouthpieces or filter-tips with smoke filter means
• • 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
  • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
  • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
• • 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
  • D21H17/31—Gums
  • D21H17/32—Guar or other polygalactomannan gum
• • 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
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
• • 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
• • 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
  • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
• • 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
  • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
  • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
• • 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
  • D21H27/30—Multi-ply
  • D21H27/32—Multi-ply with materials applied between the sheets
• • 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
  • D21H27/30—Multi-ply
  • D21H27/32—Multi-ply with materials applied between the sheets
  • D21H27/34—Continuous materials, e.g. filaments, sheets, nets
  • D21H27/36—Films made from synthetic macromolecular 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
  • D21H5/00—Special paper or cardboard not otherwise provided for
  • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
  • D21H5/14—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of cellulose fibres only
  • D21H5/16—Tobacco or cigarette paper
• • 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 an aerosol-generating article in which the aerosol-generating material is heated and thus an aerosol is released, but the aerosol-generating material is not burned.
• the aerosol-generating article comprises a wrapping material which is intended in particular for the filter part of the aerosol-generating article.
• the wrapping material has a particularly high flexural strength and can be easily perforated using a laser.
• the wrapping material of the aerosol-generating article according to the invention comprises at least two interconnected paper layers which have different densities.
• the invention also relates to a method for producing an associated wrapping material and a corresponding wrapping material.
• Aerosol generating articles are known in the art which comprise an aerosol generating material and a material which envelops the aerosol generating material to form a typically cylindrical strand.
• the aerosol-generating material is a material which releases an aerosol when exposed to heat, the aerosol-generating material only being heated but not being burned.
• the aerosol generating article also includes a filter that can filter constituents of the aerosol and that is wrapped in a filter wrap material, and a tipping paper that bonds the filter and the rod together.
• aerosol-generating articles with filters it is common for aerosol-generating articles with filters to have a perforation in the area of the filter. When used as intended, this perforation allows an air flow into the aerosol-generating article which dilutes the aerosol flowing in the aerosol-generating article. This perforation essentially determines how much aerosol the consumer ingests when using the aerosol-generating article. In many cases the perforation is in the form of holes which are arranged circumferentially around the aerosol generating article. These holes are mostly made on the aerosol-generating article by perforation using laser radiation.
• the filter is often a cylindrical strand of filter fibers that passes through the filter wrapping paper and the tipping paper is wrapped.
• the flexural rigidity of the wrapping material is particularly important for aerosol generating articles because, in use, these articles are often placed in a heater to heat the aerosol generating material. After the aerosol generating article has been used, it is removed from the heater again. As the aerosol-generating article is heated up in the heater, it happens that it sticks in the heater and a relatively greater amount of force is required to remove it from the heater.
• CA 2,004,102 discloses a cellulosic wrapping material for a smoking article having an outer and an inner layer.
• the outer layer has a weight per unit area of 20-60 g / m 2 , a density of 0.5-0.9 g / cm 2 , an air permeability of 10-250 CU, a filler content in a range of 10% - 60%, and a fire salt content in a range of 0% - 5%.
• the inner layer has a weight per unit area of 6-20 g / m 2 , a density of 0.7-1g / cm 2 and an air permeability of 0-12 CU.
• the layers are wet laminated in a paper machine.
• the object of the invention is to provide a wrapping material for an aerosol-generating article which has a comparatively high rigidity and can nonetheless be easily perforated by means of laser radiation.
• This object is achieved by an aerosol generating article according to claim 1, a method of making a suitable one Wrapping material according to claim 13 and a wrapping material according to claim 15 solved.
• the inventors have found that this object can be achieved by a wrapping material that has a thickness of at least 50 ⁇ m and at most 350 ⁇ m, a basis weight of at least 50 g / m 2 and at most 200 g / m 2 , a density of at least 500 kg / m 3 and at most 1300 kg / m 3 and a flexural strength of at least 0.15 Nmm and at most 1.50 Nmm.
• the wrapping material comprises at least two layers, the layers being connected to one another and at least one of the layers being a paper layer.
• This paper layer has a thickness of at least 40 ⁇ m and at most 70 ⁇ m, a basis weight of at least 50 g / m 2 and at most 80 g / m 2 and a density of at least 700 kg / m 3 and at most 1300 kg / m 3 a higher density than each of the other individual layers of the wrapping material.
• the flexural rigidity S b can be increased by increasing the density ⁇ or the thickness d.
• an increase in the thickness even if the density decreases to the same extent with a constant basis weight, increases the flexural rigidity.
• the thickness of the wrapping material should therefore be less than 350 ⁇ m.
• the density cannot be increased arbitrarily either, because a cladding material that is too dense cannot be perforated by the laser at high speed either. It should be noted that reducing the thickness by half requires an increase in density by a factor of 8 if the bending stiffness is to remain the same. For this reason, it can be understood that in practice rigid wrapping materials which require high density, high thickness, or both, are indeed difficult to perforate.
• the inventors have recognized that a significantly more favorable compromise between rigidity and perforation capacity can be achieved if the wrapping material has an inhomogeneous distribution of density.
• the wrapping material according to the invention should be at least 50 ⁇ m thick and have a weight per unit area of at least 50 g / m 2 and at most 200 g / m 2 so that it has good mechanical strength.
• the density of the wrapping material as a whole should be at least 500 kg / m 3 and at most 1300 kg / m 3 , so that it can be easily perforated over the entire thickness.
• the flexural strength of the wrapping material according to the invention should be at least 0.15 Nmm, which is a considerable increase compared to conventional wrapping materials for aerosol-generating articles and is very suitable for wrapping filters for aerosol-generating articles.
• the bending stiffness of the wrapping material should not be too high.
• the wrapping material is typically wrapped around the aerosol generating article and adhered to itself or to the aerosol generating article. If the restoring forces are too high due to the high flexural rigidity, the adhesive bond opens again before it has reached sufficient strength.
• the flexural strength of the wrapping material according to the invention should therefore be at most 1.50 Nmm.
• the wrapping material should comprise at least two layers, the layers being connected to one another.
• An essential aspect of the invention is that one of these layers is a paper layer and has a density which is higher than the density of the other layers.
• This inhomogeneous distribution of the density over the cross-section of the wrapping material enables efficient perforation by means of a laser by ensuring that this dense but comparatively thin layer is exactly in the area the maximum energy density of the laser radiation, while the remaining layers of the wrapping material, the density of which is lower, are in areas of lower energy density of the laser radiation.
• the density is adapted to the spatial distribution of the energy density of the laser radiation and efficient and rapid perforation of the wrapping material is possible.
• the said paper layer of the wrapping material according to the invention should have a thickness of at least 40 ⁇ m and at most 70 ⁇ m, a weight per unit area of at least 50 g / m 2 and at most 80 g / m 2 and a density of at least 700 kg / m 3 and at most 1300 kg / m 3 have.
• the basis weight of the wrapping material and the layers of the wrapping material can be determined according to ISO 536: 2012.
• the thickness, as well as the specific volume and thus the density of the wrapping material and the layers of the wrapping material can be determined according to ISO 534: 2011.
• the flexural strength of the wrapping material and the layers of the wrapping material can be determined according to TAPPI T556.
• TAPPI T556 The flexural strength of the wrapping material and the layers of the wrapping material can be determined according to TAPPI T556.
• a strip of material with a known length and width is clamped and applied to a force sensor at a defined distance from the clamped position.
• the clamping takes place in such a way that the force of gravity is orthogonal to the bending plane and therefore has no influence on the bending.
• the clamp is then rotated through a defined angle, typically 15 °, so that the material strip bends and exerts a force on the force sensor. This force is measured and the bending stiffness is calculated from it.
• the measurement of the bending is carried out in both directions and the bending stiffness is determined by averaging.
• the flexural rigidity can also depend on the direction in which the material strip was removed from the wrapping material. Unless otherwise specified, information on the bending stiffness applies regardless of the direction. This means, for example, that the bending stiffness lies within a specified interval if it lies in this interval in at least one direction.
• Typical wrapping materials not according to the invention for aerosol-generating articles have a flexural strength of 0.01 Nmm to 0.10 Nmm.
• the thickness of the wrapping material according to the invention is at least 50 ⁇ m and preferably at least 60 ⁇ m.
• the thickness is at most 350 ⁇ m, preferably at most 200 ⁇ m and particularly preferably at most 150 ⁇ m.
• a small thickness means a low flexural rigidity and tensile strength, while a higher thickness means that the wrapping material can be more easily perforated with laser radiation for the same weight per unit area. The preferred intervals therefore allow a particularly advantageous combination of these contradicting requirements.
• the weight per unit area of the wrapping material is essential for its mechanical strength.
• the wrapping material should have a weight per unit area of at least 50 g / m 2 , preferably of at least 55 g / m 2 and particularly preferably of at least 60 g / m 2 .
• the weight per unit area should be at most 200 g / m 2 , preferably at most 130 g / m 2 and particularly preferably at most 120 g / m 2 .
• the density of the cladding material is of decisive importance for how much energy is required for the laser radiation in order to perforate the cladding material, and it has a considerable influence on the flexural rigidity.
• the wrapping material should therefore have a density of at least 500 kg / m 3 , preferably at least 600 kg / m 3 and particularly preferably at least 700 kg / m 3 .
• the density of the wrapping material should be at most 1300 kg / m 3 , preferably at most 1250 kg / m 3 and particularly preferably at most 1200 kg / m 3 .
• the preferred intervals offer an advantageous compromise between high flexural rigidity and good perforation properties.
• the flexural rigidity of the wrapping material should be at least 0.15 Nmm, preferably at least 0.25 Nmm and particularly preferably at least 0.27 Nmm. This ensures that an aerosol-generating article made from the wrapping material according to the invention has such a high level of stability against mechanical deformation that it can already be clearly perceived by the consumer. Since high flexural rigidity also means high restoring force in the manufacture of the aerosol-generating article from the wrapping material according to the invention, the flexural rigidity should be at most 1.50 Nmm, preferably at most 1.25 Nmm and particularly preferably at most 1.00 Nmm. The preferred intervals allow a particularly high flexural rigidity with problem-free processing of the wrapping material.
• the wrapping material consists of at least two layers that are connected to one another.
• the connection between the layers of the wrapping material is designed in a form-fitting manner.
• a form-fitting connection can be made, for example, by knurling or by mechanically perforating the layers stacked on top of one another Layers of the wrapping material are generated.
• the perforation device bends the edges of the perforation hole of one layer into the layer underneath so that a mechanical connection sufficient for the transmission of bending stresses is established by selecting a sufficient number of perforation holes. Knurling works in a similar way.
• a major advantage of this type of connection is that no adhesive is required and thus the density of the wrapping material is not increased. On the other hand, there is a reduction in the tensile strength of the wrapping material.
• the layers of the wrapping material are glued to one another.
• all the bonds are made over the entire surface. This variant is preferred if you want to achieve the highest possible flexural rigidity.
• At least one adhesive bond between two layers of the wrapping material is not carried out over the entire surface.
• the at least one non-full-area adhesive bond is preferably designed in such a way that adhesive is applied to at least 10%, particularly preferably at least 20% and very particularly preferably at least 40% of the area of a layer of the wrapping material. This makes it possible to achieve a good mechanical connection for transferring the bending stresses between the layers of the wrapping material.
• the application of adhesive also means an increase in density, so that the adhesive is preferably applied to at most 90%, particularly preferably to at most 70% and very particularly preferably to at most 60% of the area of a layer of the wrapping material.
• Preferred intervals can also be specified for the amount of adhesive applied, which combine increased flexural rigidity with a low density particularly well.
• the amount of adhesive applied is therefore preferably at least 2 g / m 2 , particularly preferably at least 4 g / m 2 and very particularly preferably at least 5 g / m 2 .
• the amount of adhesive applied is preferably at most 12 g / m 2 , particularly preferably at most 10 g / m 2 and very particularly preferably at most 9 g / m 2 .
• the amount applied in g / m 2 denotes the amount of adhesive that remains on the paper after the adhesive has dried, based on the area to which the adhesive was actually applied.
• the adhesive is applied in this at least one gluing in the form of a pattern that extends essentially in the direction of the tensile and compressive stresses expected from the bending load .
• the adhesive can be applied in the form of a pattern from a plurality of adhesive points, the mean extent of which in a direction corresponding to the direction of the tensile and compressive stresses expected by the bending load is greater than in a direction transverse to this. The orientation to the direction of loading allows even more glue to be saved and the density of the wrapping material is not increased so much without the flexural rigidity being significantly reduced as a result.
• the expected load is primarily due to compression, that is to say a bending load in the circumferential direction.
• the gluing can very particularly preferably be designed as a line pattern in the circumferential direction of the aerosol-generating article, so that the wrapping material has a particularly high flexural strength in this direction.
• direction on the wrapping material will later correspond to the circumferential direction on the aerosol-generating article made from it.
• the bond can be carried out in such a way that the patterns of the adhesive application of each bond extend in different directions.
• the directions of two such patterns are very particularly preferably essentially orthogonal to one another.
• the gluing of at least two layers of the wrapping material can preferably be used if the wrapping material is also to form a good barrier against the penetration of water or oil.
• Some filters for aerosol-generating articles contain at least one capsule inside which contains at least one flavoring substance and can be broken during use by the consumer by pressure with the fingers in order to release the at least one flavoring substance.
• the flavoring agent or associated solvent, such as water or oil, can penetrate the wrapping material and create stains on the visible exterior of the aerosol generating article that are undesirable.
• the wrapping material can preferably be designed in such a way that it forms a resistance to the penetration of oils and has a KIT level, measured according to TAPPI T559 cm-02, of at least 4, particularly preferably of at least 6 and very particularly preferably of at least 10.
• KIT level measured according to TAPPI T559 cm-02
• Such resistance to the penetration of oils can be controlled, for example, by the amount of adhesive, the type of adhesive and, in particular, the smoothness of the layers of the wrapping material to be bonded.
• a high degree of smoothness generally leads to the formation of a homogeneous, closed adhesive layer and thus also to a higher resistance to the penetration of oils.
• the adhesive can preferably also contain fillers or other materials that control the barrier effect.
• the wrapping material is preferably designed in such a way that it forms a resistance to the absorption of water.
• the Cobb 60 value measured according to ISO 535: 2014, can be used, which describes the amount of water absorbed in g / m 2 in a specific time. Since the water absorption capacity is also largely determined by the weight per unit area of the wrapping material, it makes sense to relate the Cobb 60 value to the weight per unit area in g / m 2 and thus arrive at a dimensionless ratio that describes the water absorption capacity largely independently of the weight per unit area.
• the ratio of the Cobb 60 value according to ISO 535: 2014 in g / m 2 divided by the weight per unit area of the wrapping material in g / m 2 is at most 0.80, particularly preferably at most 0.50 and very particularly preferably at most 0.20.
• the wrapping material according to the invention comprises at least one layer which is a paper layer and has a higher density than each of the other individual layers of the wrapping material.
• Said paper layer has a thickness of at least 40 ⁇ m, preferably of at least 45 ⁇ m and particularly preferably of at least 50 ⁇ m.
• the thickness of said paper layer is at most 70 ⁇ m, preferably at most 65 ⁇ m and particularly preferably at most 60 ⁇ m.
• Said paper layer also has a weight per unit area of at least 50 g / m 2 , preferably at least 55 g / m 2 and particularly preferably at least 60 g / m 2 .
• Said paper layer has a weight per unit area of at most 80 g / m 2 , preferably at most 75 g / m 2 and particularly preferably at most 70 g / m 2 .
• said paper ply has a density of at least 700 kg / m 3 , preferably at least 750 kg / m 2 and at most 1300 kg / m 3 , preferably at most 1250 kg / m 3 .
• the paper layer can be calendered.
• the said paper layer is dense, but sufficiently thin to be perforated as a component in the wrapping material without any problems with the aid of laser light.
• Said paper layer contributes significantly to the flexural rigidity of the wrapping material and therefore inherently has a high flexural rigidity.
• the flexural strength of this paper layer is preferably at least 0.06 Nmm, particularly preferably at least 0.07 Nmm and preferably at most 0.20 Nmm, particularly preferably at most 0.18 Nmm.
• Said paper layer comprises pulp.
• the pulp can be obtained from hardwood, coniferous wood or from other plants.
• the pulp can be produced, for example, by means of the chemical and mechanical processes known in the prior art or combinations thereof, whereby mechanically produced pulp can be used with preference because of its higher content of lignin and the resulting higher flexural strength.
• mechanically produced pulp can be used with preference because of its higher content of lignin and the resulting higher flexural strength.
• chemically produced cellulose can be used with preference when the paper ply is calendered.
• Said paper ply can comprise at least one filler, the at least one filler being formed from particles and preferably the particles being considerably wider in at least one spatial direction than in at least one spatial direction orthogonal thereto.
• the particles are preferably needle-shaped or platelet-shaped. This particle shape helps to increase the flexural strength of said paper layer.
• Particularly preferred fillers are needle-shaped lime, flaky lime, kaolin or talc and mixtures thereof.
• additives can preferably be used which increase the strength of the paper ply, such as starch, starch derivatives, cellulose derivatives, polyvinyl alcohol, guar, guar derivatives or latex and mixtures thereof.
• additives can preferably be used which increase the strength of the paper ply, such as starch, starch derivatives, cellulose derivatives, polyvinyl alcohol, guar, guar derivatives or latex and mixtures thereof.
• care must be taken that the paper layer does not become too brittle, i.e. you Energy absorption capacity becomes too low, and it cannot be sufficiently deformed without breaking in the production of aerosol-generating articles from the wrapping material made therefrom.
• sheet-like materials known from the prior art for example paper or plastic films, can be selected, provided that it is ensured that the requirements in terms of thickness, basis weight, density and flexural rigidity of the wrapping material are met.
• this layer comprises cellulose, and part of the cellulose is preferably formed from cellulose made from hemp, flax, sisal, jute or abaca. These pulps make it possible to produce a paper with a particularly low density.
• Such a further paper ply preferably contains little or no filler, so that the filler content is less than 10% by weight based on the weight of this paper ply, since the filler in such papers mainly increases the density without making a significant contribution to the flexural rigidity.
• Such a further paper layer is then preferably produced on an inclined wire machine known from the prior art.
• the adhesive that may be required between the layers increases the weight per unit area and the density and thus can make it more difficult to meet the requirements for the wrapping material according to the invention. For this reason, which applies above all to bonded layers, but also independently of this, for reasons of efficiency in the production of the layers and the wrapping material, it is preferred to choose the number of layers as small as possible.
• the wrapping material therefore comprises exactly two or three layers, all layers being designed as paper layers.
• said one paper layer that is to say that one which has a higher density than the further layers, and the further layers, which in this preferred embodiment are also designed as paper layers, the same restrictions and specifications apply as have already been described above.
• the middle paper layer can be designed so that its density is lower than the density of the two outer paper layers. In this way, under the given restrictions, a particularly high flexural rigidity is achieved, although the thickness of the middle paper layer must not be too great so that the wrapping material can still be perforated at high speed.
• the thickness of the middle paper layer is particularly preferably at least 30 ⁇ m and at most 80 ⁇ m.
• the wrapping material in which the wrapping material comprises exactly three layers, all of which are designed as paper layers, said paper layer, the density of which is higher than that of the other layers, can form the middle paper layer in the wrapping material.
• the thickness of the two outer paper layers must be chosen to be higher. The thickness of each of the two outer paper layers is therefore particularly preferably at least 40 ⁇ m and at most 100 ⁇ m.
• Wrapping materials according to the invention which comprise exactly two or three layers, all layers being paper layers, can preferably be produced by means of a method in which several headboxes are provided on a conventional paper machine, from which various suspensions of cellulose and filler flow onto the wire of the paper machine and a composite of several layers is already formed on the screen, which then forms the wrapping material according to the invention. In this way it is possible to dispense with gluing the layers, as a result of which material and production steps are saved and the paper layers present in the wrapping material can be designed even better in terms of flexural rigidity and perforability.
• a first suspension containing pulp can be added from a first headbox onto the wire of a paper machine in order to form a first paper layer
• a second suspension containing pulp can be added from a second headbox onto the first paper layer lying on the wire of the paper machine in order to to form a second paper layer which forms a composite with the first paper layer
• a third suspension containing cellulose can be added from a third headbox onto the second paper layer in order to form a third paper layer which forms a composite with the second paper layer.
• An aerosol-generating article according to the invention comprises a filter and a strand which contains an aerosol-generating material, the filter being enveloped by the wrapping material according to the invention.
• the wrapping material consists of two paper layers which are glued to one another, a first paper layer, referred to as paper layer A, having a considerably higher density than the other paper layer.
• the paper layer A was a calendered paper, consisting of a mixture of 80% by weight pulp from coniferous woods and 20% by weight pulp from hardwoods.
• the paper was coated with 2 g / m 2 of polyvinyl alcohol.
• the weight per unit area of the paper was 62.7 g / m 2 , the thickness 50.4 ⁇ m and the density 1244 kg / m 3 .
• the paper had a flexural strength of 0.100 Nmm.
• This paper was glued over the entire surface as paper layer A with two different papers in order to produce two different wrapping materials according to the invention.
• the above paper layer A was bonded to a paper with a basis weight of 30.9 g / m 2 , a thickness of 48.8 ⁇ m, a density of 633 kg / m 3 and a flexural strength of 0.022 Nm to form a wrapping material according to the invention.
• the paper contained no filler and the pulp was a mixture of 25% by weight pulp from coniferous woods (long fiber pulp) and 75% by weight pulp from hardwoods (short fiber pulp), the percentages being based on the weight of the pulp.
• the paper layers were connected by full-surface gluing, in which 11.3 g / m 2 of adhesive were applied. After the bond had dried, this value was determined from the difference in the basis weights before and after the bond.
• the wrapping material produced in this way had a basis weight of 104.2 g / m 2 , a thickness of 100.6 ⁇ m and a density of 1035 kg / m 3 .
• the flexural rigidity of the wrapping material was measured, which resulted in a value of 0.270 Nmm.
• the KIT level was also measured according to TAPPI T559 cm-02 and a value of 11 was obtained.
• the above paper layer A was bonded to a paper with a basis weight of 22.5 g / m 2 , a thickness of 50.8 ⁇ m, a density of 443 kg / m 3 and a flexural strength of 0.018 Nmm to form a wrapping material according to the invention.
• the paper contained no filler and consisted exclusively of pulp from coniferous woods (long fiber pulp) and pulp from sisal.
• the paper layers were joined by full-surface gluing, in which 7.2 g / m 2 of adhesive were applied. After the bond had dried, this value was determined from the difference in the basis weights before and after the bond.
• the wrapping material produced in this way had a basis weight of 91.7 g / m 2 , a thickness of 99.4 ⁇ m and a density of 922 kg / m 3 .
• the flexural rigidity of the wrapping material was measured, which resulted in a value of 0.286 Nmm.
• the KIT level was also measured according to TAPPI T559 cm-02 and a value of 11 was obtained.
• This flexural rigidity is well above the value for conventional wrapping materials for aerosol-generating articles.
• filter rods that were wrapped with this wrapping material could easily be produced using a method known from the prior art.
• aerosol-generating articles were manufactured from the filter rods and additional components, which articles were perforated during manufacture in the circumferential direction approximately in the middle of the filter by means of a CO 2 laser. This was possible without any problems up to a production speed of 10,000 aerosol-generating articles per minute, so that this exemplary wrapping material combines high flexural rigidity with good perforability.

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• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Paper (AREA)
• Wrappers (AREA)
• Laminated Bodies (AREA)
• Cigarettes, Filters, And Manufacturing Of Filters (AREA)

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• 2018
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