WO2023174857A1 - Procédé de contrôle d'une zone de ventilation d'un article de génération d'aérosol pour des défauts de fabrication - Google Patents

Procédé de contrôle d'une zone de ventilation d'un article de génération d'aérosol pour des défauts de fabrication Download PDF

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Publication number
WO2023174857A1
WO2023174857A1 PCT/EP2023/056329 EP2023056329W WO2023174857A1 WO 2023174857 A1 WO2023174857 A1 WO 2023174857A1 EP 2023056329 W EP2023056329 W EP 2023056329W WO 2023174857 A1 WO2023174857 A1 WO 2023174857A1
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WO
WIPO (PCT)
Prior art keywords
aerosol
cross
generating article
reference image
intersection
Prior art date
Application number
PCT/EP2023/056329
Other languages
English (en)
Inventor
Michele DEL BORRELLO
Riccardo GRAZI
Original Assignee
Philip Morris Products S.A.
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 Philip Morris Products S.A. filed Critical Philip Morris Products S.A.
Publication of WO2023174857A1 publication Critical patent/WO2023174857A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F42/00—Simulated smoking devices other than electrically operated; Component parts thereof; Manufacture or testing thereof
    • A24F42/90—Testing
    • 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
    • A24C5/32—Separating, ordering, counting or examining cigarettes; Regulating the feeding of tobacco according to rod or cigarette condition
    • A24C5/34—Examining cigarettes or the rod, e.g. for regulating the feeding of tobacco; Removing defective cigarettes
    • 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
    • A24D1/20—Cigarettes specially adapted 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
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution
    • 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
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/17—Filters specially adapted for simulated smoking devices

Definitions

  • the present invention relates to a method for checking a ventilation zone of an aerosolgenerating article for manufacturing defects.
  • the present invention further relates to an inspection device for checking for manufacturing defects in a ventilation zone of an aerosolgenerating article.
  • Aerosol-generating articles comprise a substrate section comprising aerosol-forming substrate and additionally frequently a ventilation zone including a plurality of perforations allowing ambient air to enter the aerosol-generating article.
  • Methods for checking for manufacturing defects of perforations in the ventilation zone are often limited to visual inspection of the final aerosol-generating article including the ventilation zone. These methods do not provide any information about the path of the perforations inside the aerosol-generating articles.
  • Other methods are known which analyze the resistance to draw of the aerosolgenerating articles and the amount of air able to be drawn through the perforations. These methods do not provide information about the geometries of the perforations or their orientation inside the article.
  • a method for checking an aerosolgenerating article with a ventilation zone for manufacturing defects may comprise a method step of providing an aerosol-generating article with a ventilation zone.
  • the ventilation zone may comprise a plurality of perforations.
  • the method may comprise a method step of cutting the aerosol-generating article along a plane through the plurality of perforations. This may create an intersection through the plurality of perforations.
  • the method furthermore may comprise checking the intersection for manufacturing defects.
  • a method for checking an aerosol-generating article with a ventilation zone for manufacturing defects comprises: providing an aerosol-generating article with a ventilation zone, the ventilation zone comprising a plurality of perforations, cutting the aerosol-generating article along a plane through the plurality of perforations, thereby creating an intersection through the plurality of perforations, and checking the intersection for manufacturing defects.
  • the method for checking for manufacturing defects may allow checking the path of the perforations within the ventilation zone through the aerosol-generating article along the intersection. This may provide further insights about the configuration of the perforations within the aerosol-generating article.
  • the method may allow to check the structure of the perforations inside the aerosol-generating article for manufacturing defects. This may provide better insights into the structure and the path of perforations within the ventilation zone compared to methods wherein an aerosol-generating article is inspected from the outside for example by using a visual inspection system.
  • aerosol-generating article is used herein to denote an article wherein an aerosol generating substrate is heated to produce and deliver inhalable aerosol to a consumer.
  • aerosol-forming substrate denotes a substrate capable of releasing volatile compounds upon heating to generate an aerosol.
  • aerosol-generating article also encompasses continuous rods formed from a plurality of aerosol-generating articles. During the production of the aerosol-generating articles long rods containing up to 10 aerosolgenerating articles can be formed, which subsequently can be cut in order to produce smaller rods or the final articles.
  • the term “aerosol-generating article” also includes so- called “double sticks” which are two aerosol-generating articles connected together. Such double sticks may be subjected to the methods for checking for manufacturing defects as described herein.
  • aerosol-generating device refers to a device comprising a heater element that interacts with the aerosol generating substrate of the aerosol generating article to generate an aerosol.
  • the aerosol-forming substrate may be a solid aerosol-forming substrate.
  • the aerosol-forming substrate comprises homogenised plant material, preferably a homogenised tobacco material.
  • homogenised plant material encompasses any plant material formed by the agglomeration of particles of plant.
  • sheets or webs of homogenised tobacco material for the aerosol-forming substrates of the present invention may be formed by agglomerating particles of tobacco material obtained by pulverising, grinding or comminuting plant material and optionally one or more of tobacco leaf lamina and tobacco leaf stems.
  • the homogenised plant material may be produced by casting, extrusion, paper making processes or other any other suitable processes known in the art.
  • the homogenised plant material can be provided in any suitable form.
  • the homogenised plant material may be in the form of one or more sheets.
  • sheet describes a laminar element having a width and length substantially greater than the thickness thereof.
  • the homogenised plant material may be in the form of a plurality of pellets or granules.
  • the homogenised plant material may be in the form of a plurality of strands, strips or shreds.
  • strand describes an elongate element of material having a length that is substantially greater than the width and thickness thereof.
  • strand should be considered to encompass strips, shreds and any other homogenised plant material having a similar form.
  • the strands of homogenised plant material may be formed from a sheet of homogenised plant material, for example by cutting or shredding, or by other methods, for example, by an extrusion method.
  • the tobacco particles may have a nicotine content of at least about 2.5 percent by weight, based on dry weight. More preferably, the tobacco particles may have a nicotine content of at least about 3 percent, even more preferably at least about 3.2 percent, even more preferably at least about 3.5 percent, most preferably at least about 4 percent by weight, based on dry weight.
  • the aerosol-forming substrate may further comprise one or more aerosol formers.
  • an aerosol former can convey other vaporised compounds released from the aerosol-forming substrate upon heating, such as nicotine and flavourants, in an aerosol.
  • Suitable aerosol formers for inclusion in the homogenised plant material include, but are not limited to: polyhydric alcohols, such as triethylene glycol, propylene glycol, 1 ,3-butanediol and glycerol; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate.
  • the aerosol-forming substrate may have an aerosol former content of between about 5 percent and about 30 percent by weight on a dry weight basis, such as between about 10 percent and about 25 percent by weight on a dry weight basis, or between about 15 percent and about 20 percent by weight on a dry weight basis.
  • the substrate may preferably include an aerosol former content of between about 5 percent to about 30 percent by weight on a dry weight basis.
  • the aerosol former is preferably glycerol.
  • the aerosol-forming substrate may comprise a gel composition that includes an alkaloid compound, or a cannabinoid compound, or both an alkaloid compound and a cannabinoid compound.
  • the aerosol-forming substrate comprises a gel composition that includes nicotine.
  • the gel composition includes nicotine.
  • a susceptor is arranged within the rod of aerosol-forming substrate, and is in thermal contact with the aerosol-forming substrate.
  • the susceptor is an elongate susceptor.
  • the term “susceptor” refers to a material that can convert electromagnetic energy into heat. When located within a fluctuating electromagnetic field, eddy currents induced in the susceptor cause heating of the susceptor. As the elongate susceptor is located in thermal contact with the aerosol-forming substrate, the aerosol-forming substrate is heated by the susceptor.
  • the term “elongate” means that the susceptor has a length dimension that is greater than its width dimension or its thickness dimension, for example greater than twice its width dimension or its thickness dimension.
  • the susceptor is preferably arranged substantially longitudinally within the rod. This means that the length dimension of the elongate susceptor is arranged to be approximately parallel to the longitudinal direction of the rod, for example within plus or minus 10 degrees of parallel to the longitudinal direction of the rod. In preferred embodiments, the elongate susceptor may be positioned in a radially central position within the rod, and extends along the longitudinal axis of the rod.
  • the susceptor extends all the way to a downstream end of the rod of aerosol-generating article.
  • the susceptor may extend all the way to an upstream end of the rod of aerosol-generating article.
  • the susceptor has substantially the same length as the rod of aerosol-forming substrate, and extends from the upstream end of the rod to the downstream end of the rod.
  • the susceptor is preferably in the form of a pin, rod, strip or blade.
  • the susceptor preferably has a length from about 5 millimetres to about 15 millimetres, for example from about 6 millimetres to about 12 millimetres, or from about 8 millimetres to about 10 millimetres.
  • a ratio between the length of the susceptor and the overall length of the aerosolgenerating article substrate may be from about 0.2 to about 0.35.
  • the susceptor may be formed from any material that can be inductively heated to a temperature sufficient to generate an aerosol from the aerosol-forming substrate.
  • Preferred susceptors comprise a metal or carbon.
  • a preferred susceptor may comprise or consist of a ferromagnetic material, for example a ferromagnetic alloy, ferritic iron, or a ferromagnetic steel or stainless steel.
  • a suitable susceptor may be, or comprise, aluminium.
  • Preferred susceptors may be formed from 400 series stainless steels, for example grade 410, or grade 420, or grade 430 stainless steel. Different materials will dissipate different amounts of energy when positioned within electromagnetic fields having similar values of frequency and field strength.
  • parameters of the susceptor such as material type, length, width, and thickness may all be altered to provide a desired power dissipation within a known electromagnetic field.
  • Preferred susceptors may be heated to a temperature in excess of 250 degrees Celsius.
  • Suitable susceptors may comprise a non-metallic core with a metal layer disposed on the non-metallic core, for example metallic tracks formed on a surface of a ceramic core.
  • a susceptor may have a protective external layer, for example a protective ceramic layer or protective glass layer encapsulating the susceptor.
  • the susceptor may comprise a protective coating formed by a glass, a ceramic, or an inert metal, formed over a core of susceptor material.
  • the susceptor is arranged in thermal contact with the aerosol-forming substrate.
  • the susceptor heats up the aerosol-forming substrate is heated up and an aerosol is formed.
  • the susceptor is arranged in direct physical contact with the aerosol-forming substrate, for example within the aerosol-forming substrate.
  • the aerosol-generating article may further comprise a downstream section at a location downstream of the rod of aerosol-forming substrate.
  • the downstream section may comprise an intermediate hollow section comprising an aerosol-cooling element arranged in alignment with, and downstream of the rod of aerosol-forming substrate.
  • the downstream section may further comprise one or more downstream elements on top of the aerosol-cooling element.
  • the intermediate hollow section may further comprise a support element positioned immediately downstream of the rod of aerosolforming substrate, and the aerosol-cooling element may be located between the support element and the downstream end (or mouth end) of the aerosol-generating article.
  • the aerosol-cooling element may be positioned immediately downstream of the support element.
  • the aerosol-cooling element may abut the support element.
  • the downstream section may further comprise one or more elements on top of the intermediate hollow section at a location downstream of the intermediate hollow section.
  • the aerosol-cooling element may comprise a hollow tubular segment that defines a cavity extending all the way from an upstream end of the aerosol-cooling element to a downstream end of the aerosol-cooling element and the ventilation zone may be provided at a location along the hollow tubular segment.
  • hollow tubular segment is used to denote a generally elongate element defining a lumen or airflow passage along a longitudinal axis thereof.
  • tubular will be used in the following with reference to a tubular element having a substantially cylindrical cross-section and defining at least one airflow conduit establishing an uninterrupted fluid communication between an upstream end of the tubular element and a downstream end of the tubular element.
  • alternative geometries for example, alternative cross-sectional shapes
  • a hollow tubular segment provides an unrestricted flow channel. This means that the hollow tubular segment provides a negligible level of resistance to draw (RTD).
  • RTD resistance to draw
  • the flow channel should therefore be free from any components that would obstruct the flow of air in a longitudinal direction.
  • the flow channel is substantially empty.
  • the term “elongate” means that the aerosol-cooling element has a length dimension that is greater than its width dimension or its diameter dimension, for example twice or more its width dimension or its diameter dimension.
  • the term “longitudinal” refers to the direction corresponding to the main longitudinal axis of the aerosol-generating article, which extends between the upstream and downstream ends of the aerosol-generating article.
  • the terms “upstream” and “downstream” describe the relative positions of elements, or portions of elements, of the aerosol-generating article in relation to the direction in which the aerosol is transported through the aerosol-generating article during use.
  • the plurality of perforations within the ventilation zone may comprise at least 2 perforations.
  • the plurality of perforations within the ventilation zone may comprise at least 4, preferably at least 6 perforations. More preferably, the plurality of perforations may comprise up to 15, preferably up to 11 perforations within the ventilation zone.
  • the aerosol-generating article may comprise a central longitudinal axis. Cutting the aerosol-generating article along the plane through the plurality of perforations may include cutting the aerosol-generating article in the ventilation zone in a plane transversely to the central longitudinal axis. Preferably, the aerosol-generating article is cut in its ventilation zone perpendicular to the central longitudinal axis.
  • This may provide cross-sectional cuts of the plurality of perforations within the ventilation zone. This may allow to check the width and the length of the perforations within the ventilation zone for manufacturing defects.
  • Cutting the aerosol-generating article along a plane through the plurality of perforations may provide a cut piece of the aerosol-generating article, wherein one end of the cut piece forms the intersection through the ventilation zone. This cut piece of the aerosol-generating article with the intersection can then be employed in the method for checking for manufacturing defects.
  • the method may provide cross-sectional cuts of all perforations within the ventilation zone. Thus, it may be possible to check all perforations within the ventilation zone by inspecting the intersection for manufacturing defects.
  • the perforations may comprise holes extending from the exterior of the aerosolgenerating article into the interior of the aerosol-generating article.
  • the cross-sectional cuts of the perforations therefore may comprise an elongated shape, preferably a rectangular shape.
  • the aerosol-generating article may be cut through a hollow segment including the ventilation zone.
  • Checking for manufacturing defects then may comprise checking whether at least one cross-sectional cut of a perforation extends from the interior of the hollow segment to the exterior of the aerosol-generating article.
  • Checking for manufacturing defects may comprise rejecting aerosol-generating articles whose cross-sectional cuts do not extend from the interior of the hollow segment to the exterior of the aerosol-generating article.
  • the number of cross-sectional cuts of a perforation extending from the interior of the hollow segment to the exterior of the aerosol-generating article may be determined.
  • An aerosol-generating article may be rejected if less than two thirds of its cross-sectional cuts do not extend from the interior of the hollow segment to the exterior of the aerosol-generating article.
  • At least one cross-sectional cut of a perforation within the intersection may be checked for manufacturing defects.
  • at least 2 or at least 3 cross-sectional cuts are checked for manufacturing defects.
  • a tubular sacrificial element may be employed during cutting of the aerosol-generating article.
  • the tubular sacrificial element may have a slightly larger diameter than the aerosolgenerating article.
  • Tubular sacrificial element may be slipped over the aerosol-generating article before cutting the article.
  • the tubular sacrificial element may comprise a plastic tube or a shell.
  • the tubular sacrificial element may include an indicator, indicating the expected position of the perforations within the ventilation zone.
  • the indicator may comprise markings on the tubular sacrificial element.
  • the tubular sacrificial element may mechanically stabilize the aerosol-generating article during the cutting procedure. This may avoid any deformation of the aerosol-generating article, in particular in the area of the intersection formed by the cutting process.
  • the aerosol-generating article may be cut by employing a cutting device.
  • the cutting device for example may be rotating knife or filter cutting machine.
  • a reference image of a cross-sectional cut of a perforation may be provided.
  • the reference image may be superimposed on a cross-sectional cut of a perforation in the intersection of the aerosol-generating article. This may allow a visual check for manufacturing defects.
  • one or both of the width or the orientation of the cross-sectional cut within the intersection may be checked by using the reference image.
  • Employing a reference image may allow a quicker and easier visual inspection of the perforations for manufacturing defects.
  • the width of the reference image may be compared to the width of at least some of the cross-sectional cuts of perforations in the intersection. This may allow an easy check of manufacturing defects relating to the width.
  • the reference image may indicate the correct position of cross-sectional cuts of the perforations within the inter-section. Therefore, the reference image may allow for an easy inspection of potential manufacturing defects related to the orientation of the perforations within the ventilation zone.
  • the reference image may be positioned above the intersection in order to check visually for manufacturing defects.
  • the reference image and the intersection of the cut aerosolgenerating article may be rotatably arranged relative to each other.
  • the reference image may be superimposed on at least one cross-sectional cut of a perforation via a rotation.
  • Rotating the reference image relative to the cross-sectional cuts of the perforations may provide an easy method for superimposing the reference image on the cross-sectional cuts.
  • the reference image may successively be superimposed with at least some of the cross-sectional cuts of the perforations in order to check for manufacturing defects by rotating the reference image relative to the cross-sectional cuts.
  • the aerosol-generating article may comprise a central longitudinal axis.
  • the rotation of the reference image and the cross-sectional cuts relative to each other may be performed about the central longitudinal axis of the aerosol-generating article.
  • the rotational movement may be centered about the central longitudinal axis of the cut aerosol-generating article. This may provide an easy method of superimposing the reference image on at least some of the cross-sectional cuts of the perforations.
  • An inclination of the cross-sectional cut of a perforation relative to the plane of the cut may be determined.
  • a cross-sectional cut of the perforation in the intersection may not continuously run from the exterior of the aerosol-generating article into the interior of the article. Consequently, partial cross-sectional cuts which do not extend from the exterior to the interior of the aerosolgenerating article in the intersection can be viewed as manufacturing defects. Consequently, aerosol-generating articles including these partial cross-sectional cuts in their intersections can be rejected in the method for checking for manufacturing defects.
  • the method for checking for manufacturing defects of the present invention can therefore also determine whether perforations in the ventilation zone have the correct orientation within a plane of the ventilation zone.
  • the reference image may be an image of a correctly positioned and correctly shaped cross-sectional cut.
  • the reference image furthermore may have the correct width.
  • the area of the reference image which can be superimposed on the area of a cross- sectional cut of a perforation may be determined. This may allow a skilled person to determine a percentage of overlap between the area of the reference image and the cross-sectional cut of a perforation. A low percentage of superimposable area of the reference image may indicate a large deviation between the reference image and the cross-sectional cut of a perforation in the intersection of an aerosol-generating article. An aerosol-generating article may be rejected if the deviation between the cross-sectional cuts of its perforations in the intersection and the reference image is too large. An aerosol-generating article may be rejected if less than 80 percent, preferably less than 85 percent, more preferably less than 90 percent of the area of the reference image can be superimposed onto the area of the cross-sectional cut of the perforation.
  • An aerosol-generating article furthermore may be rejected if less than 80 percent, preferably less than 85 percent, more preferably less than 90 percent of the overall number of cross-sectional cuts of the perforations in the intersection can be superimposed to such an extent that at least 80 percent of the area of the reference image can be superimposed on the area of the respective cross-sectional cuts as described above.
  • small deviations between the area of the reference image and the area of the cross-sectional cut of at a maximum 20 percent, preferably at a maximum of 10 percent may be tolerable. These small deviations may still allow a sufficient resistance to draw and may allow a sufficient temperature adjustment of the aerosol in the ventilation zone of the aerosol- generating article due to ambient air entering the aerosol-generating article through the perforations.
  • the percentage of overlap of an area of a reference image and an area of a cross- sectional cut of a perforation in the intersection may be determined by employing a computed CT scan. Some methods steps or the complete method of checking the ventilation zone of the aerosol-generating article for manufacturing defects may include computer-implemented methods.
  • the reference image may be a computer-generated image or may be implemented in an inspection tool, as further described below.
  • An aerosol-generating article may be rejected if a central axis of a cross-sectional cut of a perforation in the intersection of the aerosol-generating article has an inclination angle of more than 10 degrees, preferably more than 5 degrees with respect to the reference image.
  • Such a large inclination angle may indicate that the perforation is tilted to such a great degree in comparison to the reference image that the aerosol-generating article has to be rejected.
  • a perforation has passed the method for checking for manufacturing defects if the central axis of the cross-sectional cut is located completely within the reference image.
  • the inclination angle between the central axis of a cross-sectional cut and the reference image may be determined as the cutting angle between the central axis of the cut and the reference image.
  • an aerosol-generating article may be rejected when the reference image cannot be superimposed on the cross-sectional cut of a perforation in the intersection. This may indicate that the perforations are offset from the reference image to such an extent that the aerosol-generating article has to be rejected.
  • the reference image may comprise one of: a line indicating the width and the position of a correctly positioned and correctly shaped cross-sectional cut or, a circular arc, indicating an area within which a central axis of the cross-sectional cut of a perforation should be located.
  • a reference image comprising a line indicating the width and the position of a correctly positioned and correctly shaped cross-sectional cut may be employed in order to determine the degree of overlap between the area of the reference image and the area of the cross- sectional cut.
  • the reference image comprising a circular arc may be employed in order to determine the above-described inclination angle between the central axis of the cross-sectional cut and the reference image.
  • An inspection tool may be used for checking for manufacturing defects.
  • the inspection tool may comprise: a cavity for receiving a cut piece of the aerosol-generating article, wherein the cut piece includes the intersection, the reference image of a cross-sectional cut of a perforation, and means to rotate the reference image and the cut aerosol-generating article relative to each other for superimposing the reference image on a cross-sectional cut of a perforation within the intersection.
  • Such a tool can conveniently be employed in order to superimpose easily the reference image onto a cross-sectional cut of a perforation.
  • the cut piece of the aerosolgenerating article including the intersection may be accommodated in the cavity.
  • the bottom of the cavity may comprise a transparent material. This may allow a user to view the intersection of the cut piece of the aerosol-generating article when accommodated in the cavity.
  • the reference image may be located adjacent to the bottom of the cavity. This may allow a user of the inspection tool to easily superimpose the reference image on any cross- sectional cut of a perforation located in the intersection of the cut piece of the aerosolgenerating article.
  • the reference image may be included in a transparent reference element of the inspection tool.
  • the transparent reference element may be configured to be rotatable relative to the cavity, in particular to the transparent bottom of the cavity of the inspection tool.
  • the inspection tool may be configured for a user to view the intersection of the cut piece of the aerosol-generating article through the transparent reference element and the transparent bottom of the cavity.
  • the inspection tool may furthermore comprise a light source for illuminating the intersection and the reference image. This may ease the visual checking of the intersection for manufacturing defects.
  • the inspection tool furthermore may comprise magnifying means.
  • the magnifying means may be configured to provide an enlarged image of the intersection of the cut piece of the aerosol-generating article including the cross-sectional cuts of the perforation.
  • the magnifying means may ease visually checking the intersection for manufacturing defects.
  • the magnifying means may comprise or may consist of a magnifying lens.
  • the magnifying means may ease manual visual inspection of any manufacturing defects.
  • the reference image may comprise one of: a line indicating the width and the position of a correctly positioned and correctly shaped enlarged cross-sectional cut or, a circular arc, indicating an area within which a central axis of an enlarged cross- sectional cut of a perforation should be located.
  • the reference image may be adapted to indicate the width and the position of correctly positioned and correctly shaped cross-sectional cut enlarged by the magnifying means, or may comprise a circular arc, indicating an area within which the central axis of the cross-sectional cut of a perforation which is enlarged by the magnifying means should be located.
  • the reference image may be located on the magnifying means. This may ease superimposing the reference image onto the enlarged cross-sectional cuts of the intersection of the cut piece of the aerosol-generating article.
  • the magnifying means may ease manual visual inspection of any manufacturing defects by a user of the inspection tool.
  • the bottom of the cavity of the inspection tool may be located within the focal length of the magnifying means. This may allow sufficient magnification of the intersection of the cut piece of the article.
  • the magnifying means may provide a magnification factor of between 1.5 and 10, preferably 2 and 6.
  • the plurality of perforations in the ventilation zone of the aerosol-generating article may extend radially from the central longitudinal axis of the article.
  • Checking for manufacturing defects in the intersection may then comprise checking whether the cross-sectional cuts of the perforations are tilted with respect to their radial extension from the central longitudinal axis.
  • An aerosol-generating article may be rejected if the cross-sectional cuts of the perforations in the intersection of this article are tilted by more than 20 degrees, preferably more than 5 degrees with respect to their radial extension.
  • intersection of the cut piece of the aerosol-generating article may be stained for increasing the contrast between the perforations and the wall of the aerosol-generating article.
  • Staining may be done by contacting the intersection with a dye, such as ink.
  • the aerosol-generating article may be tubular and the perforations may be arranged circumferentially around the tubular aerosol-generating article.
  • the intersection of such an aerosol-generating article can easily be checked for manufacturing errors employing the methods described herein, in particular the method involving the reference image.
  • the reference image may be easily superimposed on at least some of the cross-sectional cuts of the perforations by rotating the reference image relative to the cross-sectional cuts.
  • the method step of checking the intersection for manufacturing defects may comprise two separate checking steps.
  • a first initial checking step the number of complete cross- sectional cuts of the perforations of an intersection of the aerosol-generating article extending from the exterior of the article into the interior of the article may be determined. If the number of complete cross-sectional cuts is above a threshold value, one or more of the positions of the cross-sectional cuts within the intersection, the shape of the cross-sectional cuts and the angle of the cross-sectional cuts with respect to a radial extension of the perforations may be checked in a second checking step.
  • the threshold value may represent a minimum fraction of complete cross-sectional cuts in relation to the overall number of cross-sectional cuts being located in the intersection of the aerosol-generating article.
  • the number of cross-sectional cuts of the perforations of an intersection of the aerosol-generating article which extend from the exterior of the article to the interior of the article may be determined. Partial cross-sectional cuts of the perforations which do not extend from the exterior of the article to the interior of the article may be viewed as manufacturing defects and may not count as complete cross-sectional cuts. An aerosolgenerating article may be rejected and may not be subjected to further checking steps for manufacturing defects, if less than 40 percent, preferably less than 30 percent, more preferably less than 25 percent of the expected number of cross-sectional cuts completely extend from the exterior of the article to the interior of the article. This percentage values may represent the threshold value of the first initial checking step.
  • the aerosol-generating article may be rejected and no further checking steps may be performed involving this article. If at least 3 perforations are present completely extending from the exterior to the interior of the article, further inspection steps, in particular the second checking step, may be employed.
  • the invention furthermore provides an inspection tool for checking for manufacturing defects in the ventilation zone of an aerosol-generating article, wherein the ventilation zone comprises a plurality of perforations.
  • the inspection tool may comprise a cavity for receiving the aerosol-generating article, wherein the aerosol-generating article is cut along a plane through the ventilation zone for creating an intersection through the plurality of perforations.
  • the inspection tool may comprise a reference image of a cross-sectional cut of a perforation.
  • the inspection tool may comprise means to rotate the reference image and the intersection of the cut aerosol-generating article relative to each other for superimposing the reference image on a cross-sectional cut of a perforation within the intersection.
  • Another embodiment of the invention provides an inspection tool for checking for manufacturing defects in the ventilation zone of an aerosol-generating article, wherein the ventilation zone comprises a plurality of perforations.
  • the inspection tool comprises:
  • Such an inspection tool may ease the visual inspection of the intersection for manufacturing defects.
  • the inspection tool further may comprise a light source for eliminating the intersection and the reference image.
  • the light source may further facilitate the visual inspection of the intersection.
  • the reference image may be included in a transparent rotatable part of the tool. This may ease superimposing the reference image on a cross-sectional cut of a perforation within the intersection.
  • the transparent rotatable part of the tool may comprise the magnifying means, such as a magnifying lens.
  • the inspection tool may comprise further features, as described above for the method employing the inspection tool.
  • Example A Method for checking an aerosol-generating article with a ventilation zone for manufacturing defects, comprising:
  • the ventilation zone comprising a plurality of perforations
  • Example B Method according to example A, wherein at least one cross-sectional cut of a perforation within the intersection is checked for manufacturing defects, preferably wherein at least 2 or 3 cross-sectional-cuts, more preferably wherein all cross-sectional cuts of a perforation are checked for manufacturing defects.
  • Example C Method according to the preceding example wherein an inclination of the cross-sectional cut of a perforation relative to the plane is determined.
  • Example D Method according to any of the preceding examples, wherein a reference image of a cross-sectional cut of a perforation is provided and wherein the reference image is superimposed on a cross-sectional cut of a perforation in the intersection of the aerosol-generating article in order to visually check for manufacturing defects, preferably wherein one or both of the width or the orientation of the cross-sectional cut within the intersection is checked by using the reference image, more preferably wherein the area of the reference image which can be superimposed on one cross-sectional cut of a perforation is determined.
  • Example E Method according to the preceding example, wherein the reference image is positioned above the intersection and wherein the reference image and the intersection are rotatably arranged relative to each other and wherein the reference image is superimposed on one cross-sectional cut of a perforation via a rotation.
  • Example F Method according to any of the preceding examples D or E, wherein an aerosol-generating article is rejected if less than 80 percent, preferably less than 90 percent of the area of the reference image can be superimposed on the area of a cross-sectional cut of a perforation in the intersection of the aerosol-generating article.
  • Example G Method according to any of the preceding examples D to F, wherein an aerosol-generating article is rejected if a central axis of a cross-sectional cut of a perforation in the intersection of the aerosol-generating article has an inclination angle of more than 10 degrees, preferably more than 5 degrees with respect to the reference image.
  • Example H Method according to the preceding examples D to G, wherein an aerosol-generating article is rejected when the reference image cannot be superimposed on the cross-sectional cut of a perforation in the intersection.
  • Example I Method according to the preceding examples D to H, wherein the reference image comprises one of:
  • Example J Method according to the preceding examples D to I, wherein an inspection tool is used for checking for manufacturing defects, the inspection tool comprising: - a cavity for receiving a cut piece of the aerosol-generating article, wherein the cut piece includes the intersection,
  • Example K Method according to the preceding example, wherein the inspection tool further comprises a light source for illuminating the intersection and the reference image.
  • Example L Method according to any of the preceding examples, wherein the aerosol-generating article is cut through a hollow segment including the ventilation zone and wherein checking for manufacturing defects comprises checking whether at least one cross- sectional cut of a perforation extends from the interior of the hollow segment to the exterior of the article, preferably wherein the number of cross-sectional cuts of a perforation extending from the interior of the hollow segment to the exterior is determined.
  • Example M Method according to the preceding example, wherein an aerosolgenerating article is rejected when at least one cross-sectional cut of a perforation does not extend from the interior to the exterior of the article.
  • Example N Method according any of the preceding examples, wherein the aerosolgenerating article includes a central longitudinal axis and wherein the aerosol-generating article is cut transversely to the longitudinal axis thereby creating the intersection, preferably wherein the aerosol-generating article is cut perpendicular to the longitudinal axis.
  • Example O Method according to the preceding claim 14, wherein the plurality of perforations extends radially from the central longitudinal axis.
  • Example P Method according to any of the preceding examples, wherein the intersection is being stained for increasing the contrast between the perforations and the wall of the aerosol-generating article.
  • Example Q Method according to any of the preceding examples, wherein the aerosol-generating article is tubular and wherein the perforations are arranged circumferentially around the tubular aerosol-generating article.
  • Example R Inspection tool for checking for manufacturing defects in a ventilation zone of an aerosol-generating article, the ventilation zone comprising a plurality of perforations, the inspection tool comprising:
  • Example S Inspection tool according to the preceding example, wherein the inspection tool further comprises a light source for illuminating the intersection and the reference image.
  • Example T Inspection tool according to any of the preceding examples R or S, wherein the reference image is included in a transparent rotatable part of the tool.
  • Fig. 1 shows a cross-sectional view of an aerosol-generating article including a ventilation zone
  • Fig. 2 depicts a schematic perspective view of an inspection tool accommodating a cut piece of an aerosol-generating article with an intersection;
  • Fig. 3A shows a cross-sectional view of an aerosol-generating article with different perforations
  • Fig. 3B shows a cross-sectional view of the aerosol-generating article of Fig. 3A with a complete cross-sectional cut and partial cross-sectional cut;
  • Fig. 4A and 4B show enlarged views of intersections of cut pieces of aerosol-generating articles also depicting a line as a reference image for checking the intersections for manufacturing defects;
  • Fig. 5A and 5B show enlarged views of intersections of cut pieces of aerosol-generating articles also including a circular arc as a reference image for checking the intersections for manufacturing defects;
  • Fig. 6 shows an intersection of a cut piece of an aerosol-generating article wherein a reference image as outlined is superimposed over a cross-sectional cut for perforation in order to determine the percentage of overlap between the area of the reference image and the area of the cross-sectional cut.
  • Fig. 7A to 7C show sequence of cutting the ventilation zone of an aerosol-generating article employing a tubular sacrificial element.
  • Fig. 1 shows a cross-sectional view of an aerosol-generating article 10.
  • the aerosolgenerating article 10 includes an aerosol-forming substrate 22 with a susceptor element 24. Such an aerosol-generating article 10 can be inserted into an aerosol-generating device including for example a heating coil as a heating element. This heating coil may heat the susceptor element via a varying magnetic field by inductive heating.
  • the aerosol-generating article 10 also includes a hollow aerosol-cooling element 17 which comprises hollow tubular elements 34 and 20. This aerosol-cooling element 17 serves to cool down and to further promote the formation of an aerosol from the aerosol-forming substrate. This aerosol-cooling element 17 also includes a ventilation zone 14 with perforations 12.
  • the perforations are frequently formed in the aerosol-generating article by a laser device.
  • a user sucks on the mouthpiece filter 30 of the aerosol-generating article 10
  • ambient air from the exterior of the article may enter the aerosol-cooling element 17 through the perforations 12 into the interior of the article. This may facilitate the cooling and the formation of the aerosol.
  • the positions of the perforations 12 within the ventilation zone 14 are important for providing a sufficient cooling effect also facilitating the formation of an aerosol. Therefore, regularly checking the correct position and the shape of the perforations within the ventilation zone 14 is important for providing a reliable smoking experience to a user.
  • the aerosol-generating article 10 also includes a front plug 32.
  • Outer wrapping paper 26 is present circumscribing the aerosol-forming substrate in the upstream portion of the aerosol-generating article.
  • the downstream portion of the aerosol-generating article including the ventilation zone 14 and the mouthpiece filter 30 is covered by tipping paper 28.
  • the aerosol-generating article has a tubular shape and includes a central longitudinal axis 18.
  • the ventilation zone 14 including the perforations can be cut along the plane 16.
  • This plane 16 preferably runs perpendicular to the central longitudinal axis 18 of the aerosol-generating article. Cutting the ventilation zone 14 along the plane 16 produces cross-sectional cuts of the perforations within an intersection, which can be further checked for manufacturing defects.
  • Fig. 2 shows a schematic perspective view of an inspection tool 40 which includes a cut piece 10A of an aerosol-generating article within its cavity 38. Owing to the cutting of the ventilation zone along the plane 16 shown in Fig. 1 , a cut piece 10A of an aerosol-generating article has been provided, which includes an intersection 36 through the ventilation zone.
  • the inspection tool 40 includes magnifying means 42, for example a magnifying lens, which produces an enlarged view 44 of the intersection 36 of the cut piece of the aerosol-generating article. Checking the enlarged view 44 for manufacturing defects greatly facilitates the detection of the defects.
  • the magnifying means 42 also includes a reference image 46 in the form of a line. This reference image 46 indicates the correct position and shape of cross- sectional cuts of perforations.
  • the area of the reference image 46 within the fine hollow acetate tube 20 also might indicate the area of a cross-sectional cut of a correctly orientated and correctly shaped perforation.
  • the magnifying means can be rotated about the central longitudinal axis 18 of the cut piece 10A of the aerosol-generating article, as indicated by the arrow 48. This allows a user of the inspection tool 40 to superimpose the reference image 46 onto the various cross-sectional cuts 12A of the enlarged view 44 of the intersection 36.
  • the material of the fine hollow acetate tube 20 might be stained with a dye, such as ink in order to increase the contrast between the cellulose acetate material of the fine hollow acetate tube 20 and the cross-sectional cuts 12A.
  • the reference image 46 may be superimposed on successive cross-sectional cuts 12A by rotating the magnifying means. This may allow a user to visually inspect at least some or all of the cross-sectional cuts 12A for manufacturing defects.
  • a light source 50 for illuminating the intersection or the enlarged view 44 of the intersection may be present. This may ease the visual inspection for manufacturing defects.
  • Fig. 3A depicts a cross-sectional view of a part of an aerosol-generating article 10 with the fine hollow acetate tube material 20 in the ventilation zone.
  • Two separate perforations 12 are present in the ventilation zone.
  • the perforation 12 on the left-hand side of the fine hollow acetate tube 20 is a perforation with the correct shape and positioning which is also correctly positioned within the pane 16.
  • the perforation 12’ on the right-hand side of the fine hollow acetate tube 20 exhibits an inclination with regard to the plane 16.
  • the perforation 12’ exhibits an inclination as shown by the inclination angle 12D of the central axis 12C of the perforation with regard to the plane 16 for cutting the article.
  • Fig. 3B depicts a cross-sectional view of the aerosol-generating article 10 shown in Fig. 3A along the plane 16. Cutting the aerosol-generating article 10 of Fig. 3A along the plane 16 provides the intersection 36 of the article shown in Fig. 3B.
  • the perforation 16 in Fig. 3A with the correct positioning and shape, whose central axis coincides with the plane 16 provides a cross-sectional cut 12A shown in Fig. 3B, which is a complete cross-sectional cut extending from the exterior 13 of the aerosol-generating article to the hollow interior 15.
  • FIG. 4A depicts an enlarged view 44 of an intersection 36 through the ventilation zone of an aerosol-generating article, wherein the cellulose acetate material of the fine hollow acetate tube has been stained with an ink in order to increase the contrast.
  • the perforations in the ventilation zones result in complete cross-sectional cuts 12A which extend from the exterior of the article into the interior.
  • a reference image 46 in the form of a line can be used for assessing any potential manufacturing defects. This reference image 46 can easily be superimposed on the cross-sectional cuts 12A as shown in Fig. 4A indicating that the cross- sectional cuts 12A have the desired correct positioning and shape.
  • cross- sectional cuts 12A are complete cross-sectional cuts therefore also indicating that the respective perforations to not exhibit a significant inclination of the central axis of these perforations with regard to the plane 16 for cutting the article.
  • An aerosol-generating article exhibiting such an intersection therefore can pass the method for checking the ventilation zone for manufacturing defects as indicated by the checkmark in the upper right-hand side of Fig. 4A.
  • Fig. 4B depicts an enlarged view 44 of an intersection of a different aerosol-generating article after cutting the article.
  • the intersection exhibits partial cross-sectional cuts 12B of the perforations indicating a significant inclination of the respective central axis of the perforations with regard to the plane 16.
  • the positioning of the partial cross-sectional cuts 12B with regard to the reference image 46 as shown within the circle depicted in Fig. 4B also is offset. Therefore, it is not possible to superimpose a large enough area of the reference image 46 onto the area of the cross-sectional cuts. Consequently, an aerosol-generating article exhibiting such an intersection after cutting is rejected in the method for checking for manufacturing defects, as indicated by the cross mark in the upper right-hand side of Fig. 4B.
  • Fig. 5A shows an enlarged view 44 of another intersection of an aerosol-generating article after cutting the article.
  • a reference image 46 in the form of a circular arc is present.
  • This circular arc indicates a correct position of a cross-sectional cut within the intersection.
  • a central axis 12E of the cross-sectional cut should be located within the circular arc in order for the respective perforations to pass the method for checking for manufacturing defects.
  • a central axis 12E of one cross-sectional cut is fully located within the circular arc of the reference image, indicating that the respective perforation has the correct positioning and shape.
  • FIG. 5B shows an enlarged view of a further intersection of an aerosol-generating article after cutting the article.
  • the circular arc 46 does not cover the central axis 12E of the cross-sectional cut. Rather, and inclination angle or cutting angle 12F is present between the central axis 12E of the cross-sectional cut and the circular arc 46. If this inclination angle 12F is too large, in particular larger than 10 degrees, preferably larger than 5 degrees, then the aerosol-generating article is rejected as indicated by the cross mark in the upper right-hand side of Fig. 5B.
  • Fig. 6 shows another intersection of the ventilation zone of an aerosol-generating article.
  • the perforations and also their respective cross-sectional cuts 12A are extending radially from the central longitudinal axis 18 of the article.
  • a reference image 46 in the form of a line as indicated by the dashed line in Fig. 6 can be used in order to superimpose the area of the reference image 46 onto the area of a cross-sectional cut 12A. If the reference image 46 is a longer line also extending into the interior of the intersection, then only the area of the reference image located within the cellulose acetate tube 20 is taken into consideration when calculating the percentage of overlap between the area of the reference image and the area of the respective cross-sectional 12A as shown in Fig. 6.
  • the cross-sectional cut is slightly tilted with regard to the reference image, so that not the complete area of the reference image can be superimposed on the area of the cross-sectional cut.
  • small deviations of at a maximum 20 percent, preferably at a maximum of 10 percent as explained above, may be tolerable. Therefore, an aerosol-generating device exhibiting an intersection as shown in Fig. 6 can also pass the method for checking for manufacturing defects.
  • FIG. 7A to 7C depict a sequence of methods steps for cutting the aerosol-generating article along a plane 16 through the perforations 12 in the ventilation zone.
  • Fig. 7A depicts schematically the aerosol-generating article 10 with the perforations 12.
  • This article can be slipped into a tubular sacrificial element 52 as shown in Fig. 7B.
  • This tubular sacrificial element 52 may for example be a plastic tube which also includes an opening 54 which enables the tubular sacrificial element to be slipped over the aerosol-generating article 10.
  • the ventilation zone of the article 10 can be cut along the plane 16 employing cutting means 56.
  • This method allows an easy cutting of the ventilation zones through the perforations 12 without causing a large deformation of the resulting intersection, Such a deformation of the intersection may interfere with the method for checking for manufacturing defects and therefore should be avoided.

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  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

L'invention concerne un procédé de contrôle d'un article de génération d'aérosol ayant une zone de ventilation pour des défauts de fabrication, le procédé consistant à : - fournir un article de génération d'aérosol ayant une zone de ventilation, la zone de ventilation comprenant une pluralité de perforations, - couper l'article de génération d'aérosol le long d'un plan à travers la pluralité de perforations, créant ainsi une intersection à travers la pluralité de perforations, et - contrôler l'intersection pour des défauts de fabrication. Un tel procédé de contrôle d'un article de génération d'aérosol pour des défauts de fabrication peut également contrôler la forme et le positionnement des perforations à l'intérieur de l'article.
PCT/EP2023/056329 2022-03-14 2023-03-13 Procédé de contrôle d'une zone de ventilation d'un article de génération d'aérosol pour des défauts de fabrication WO2023174857A1 (fr)

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EP22161911 2022-03-14

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WO2023174857A1 true WO2023174857A1 (fr) 2023-09-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2021765A1 (fr) * 2006-05-09 2009-02-11 Molins PLC Système d'imagerie destiné à déterminer la perméabilité du papier
WO2013046402A1 (fr) * 2011-09-29 2013-04-04 日本たばこ産業株式会社 Procédé pour inspecter et système pour inspecter des filtres de cigarette
EP2789248A1 (fr) * 2011-12-09 2014-10-15 Japan Tobacco, Inc. Article à fumer et filtre
WO2015152072A1 (fr) * 2014-03-31 2015-10-08 日本たばこ産業株式会社 Filtre pour produit de tabac et produit de tabac
CN109827525A (zh) * 2019-02-01 2019-05-31 浙江中烟工业有限责任公司 一种快速自动检测沟槽滤棒特征参数的小型检测系统

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Publication number Priority date Publication date Assignee Title
EP2021765A1 (fr) * 2006-05-09 2009-02-11 Molins PLC Système d'imagerie destiné à déterminer la perméabilité du papier
WO2013046402A1 (fr) * 2011-09-29 2013-04-04 日本たばこ産業株式会社 Procédé pour inspecter et système pour inspecter des filtres de cigarette
EP2789248A1 (fr) * 2011-12-09 2014-10-15 Japan Tobacco, Inc. Article à fumer et filtre
WO2015152072A1 (fr) * 2014-03-31 2015-10-08 日本たばこ産業株式会社 Filtre pour produit de tabac et produit de tabac
CN109827525A (zh) * 2019-02-01 2019-05-31 浙江中烟工业有限责任公司 一种快速自动检测沟槽滤棒特征参数的小型检测系统

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