EP4064884A1 - Matériau filtrant plissé pour article à fumer - Google Patents

Matériau filtrant plissé pour article à fumer

Info

Publication number
EP4064884A1
EP4064884A1 EP21748622.4A EP21748622A EP4064884A1 EP 4064884 A1 EP4064884 A1 EP 4064884A1 EP 21748622 A EP21748622 A EP 21748622A EP 4064884 A1 EP4064884 A1 EP 4064884A1
Authority
EP
European Patent Office
Prior art keywords
fibers
filter material
fibrous web
hydroentangled nonwoven
segment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21748622.4A
Other languages
German (de)
English (en)
Inventor
Dietmar Volgger
Stefan Bachmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delfortgroup AG
Original Assignee
Delfortgroup AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delfortgroup AG filed Critical Delfortgroup AG
Publication of EP4064884A1 publication Critical patent/EP4064884A1/fr
Pending legal-status Critical Current

Links

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
    • 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
    • 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
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
    • 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
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • 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
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/062—Use of materials for tobacco smoke filters characterised by structural features
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/26—Wood pulp
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/04—Filters

Definitions

  • the invention relates to a filter material suitable for the manufacture of a segment in a smoking article which is pleated and from which segments for smoking articles can be manufactured in an efficient manner.
  • the invention also relates to a segment for a smoking article made from this filter material.
  • Smoking articles are typically rod-shaped articles consisting of at least two rod-shaped segments arranged one after the other.
  • One segment contains a material that is capable of forming an aerosol when heated, and at least one other segment is used to influence the properties of the aerosol.
  • the smoking article can be a filter cigarette in which a first segment contains the aerosol-forming material, in particular tobacco, and a further segment is designed as a filter and is used to filter the aerosol.
  • the aerosol is generated by burning the aerosol-forming material, and the filter primarily serves to filter the aerosol and to provide the filter cigarette with a defined draw resistance.
  • the smoking article can also be a so-called tobacco heater, in which the aerosol-forming material is only heated but not burned. This reduces the number and amount of harmful substances in the aerosol.
  • a smoking article also consists of at least two, but more often more, in particular four segments.
  • One segment contains the aerosol forming material, which typically comprises tobacco, reconstituted tobacco, or tobacco processed by other processes.
  • Other segments in the smoking article are used to direct the aerosol, cool the aerosol or filter the aerosol.
  • the segments are mostly encased by an encasing material. Paper is very often used as a wrapping material.
  • segment is understood to mean the segment of a smoking article that does not contain the aerosol-forming material but is used, for example, to direct, cool or filter the aerosol . It is known from the prior art to form such segments from polymers such as cellulose acetate or polylactides. After consumption of the smoking article, the smoking article must be disposed of appropriately. In many cases, however, the consumer simply throws the consumed smoking article away in the environment and attempts to restrict this behavior through information or punishment have had little success.
  • a web of paper or a cellulose-based fleece is first pleated in the longitudinal direction, then formed into an endless strand and covered with a wrapping material. Finally, the endless strand is cut into pieces suitable for further processing.
  • the web is passed through two patterned rollers which, under high pressure, emboss that pattern onto the web. Typically, this pattern is a line pattern oriented in the machine direction of the web. The embossed lines weaken the web in the direction orthogonal to the running direction, the transverse direction, so that an endless strand can then be formed more easily by pushing the web together in the transverse direction.
  • DE io 2005 017478 Ai discloses a tobacco smoke filter which contains fibers which have regenerated cellulose (eg lyocell) and into which adsorbent is incorporated. More than one adsorbent is introduced into the fibers of the tobacco smoke filter and/or the tobacco smoke filter contains adsorbent between the fibers.
  • the document states that a high loading of adsorbent can be achieved with such a tobacco smoke filter.
  • two webs were made from charged lyocell staple fibers.
  • One mat contained an adsorbent loading of 50% by weight "Siralox 40" (Sasol Ltd.) in the lyocell fibers used to produce it.
  • the other web contained a loading of 50% by weight HY zeolite in its fibers. After adding activated carbon granules to one of the two fleece layers, the two fleeces were connected to one another by needling.
  • the object of the invention is to provide a filter material for a smoking article which can be processed with high productivity into a segment of a smoking article and which is otherwise as similar as possible to conventional filter materials in terms of its properties.
  • a filter material for producing a segment for a smoking article comprising a hydroentangled nonwoven, and the nonwoven comprising fibers, the fibers being selected from the group consisting of cellulose fibers, fibers of regenerated cellulose and mixtures thereof, and these fibers are contained together in an amount of at least 50% and at most 100% of the mass of the hydroentangled nonwoven fabric in the nonwoven fabric, and wherein the nonwoven fabric is web-shaped, one longitudinal direction in the running direction of the web, one orthogonal thereto in the web plane and has a thickness direction orthogonal to the longitudinal direction and the transverse direction and is shaped in such a way that the nonwoven fabric has a corrugated structure in the plane spanned by the transverse direction and the thickness direction with a corrugation height of at least 50 ⁇ m and a maximum of 1000 ⁇ m, and a wavelength of mi at least 150 pm and at most 5000 pm.
  • hydroentangled initially refers to the underlying manufacturing process
  • a hydroentangled nonwoven fabric has characteristic structural properties that distinguish it from other nonwoven fabrics and, to the inventors' knowledge, are not produced in an identical manner by any other manufacturing process can be reached.
  • the strength of the hydroentangled nonwoven is achieved by the turbulence of the fibers and as a result the fibers are one significant part also aligned in the thickness direction of the non-woven fabric.
  • the hydroentangled nonwoven fabric In the production of the hydroentangled nonwoven fabric according to the invention, fibers are placed on a water-permeable screen and entangled by means of turbulence with a plurality of water jets arranged in the transverse direction and directed at the fibers. through the According to the invention, a special choice of arrangement and properties of the water jets can produce a wavy structure in the transverse direction in the nonwoven fabric, which is similar to a structure that can also be obtained by pleating.
  • the non-woven fabric and the filter material according to the invention comprising the non-woven fabric are therefore pre-pleated.
  • the filter material is passed through two patterned rollers. Due to the fact that the filter material according to the invention is already pre-pleated, only a considerably lower pressure is required to achieve sufficient pleating of the filter material, or pleating can even be dispensed with entirely. This also significantly reduces the likelihood of accidentally cutting the filter material lengthways. In this way, the number of operational interruptions in the manufacture of the endless strand and the segments can be reduced and productivity is increased, which is the main advantage of the filter material according to the invention.
  • the nonwoven fabric is in the form of a web and has a longitudinal direction in the running direction of the web and a direction orthogonal thereto in the plane of the web, which is referred to as the transverse direction.
  • the direction orthogonal to the longitudinal and transverse directions is referred to as the thickness direction.
  • the nonwoven fabric contained in the filter material according to the invention has a corrugated structure in the plane formed by the transverse direction and the thickness direction, the cross-sectional area, with the wavelength extending essentially in the transverse direction and the wave height essentially extending in the thickness direction.
  • the wave height is at least 50 ⁇ m and at most 1000 ⁇ m, preferably at least 100 ⁇ m and at most 900 ⁇ m and particularly preferably at least 150 ⁇ m and at most 800 ⁇ m.
  • the wavelength is at least 150 pm and at most 5000 pm, preferably at least 300 pm and at most 4000 pm and particularly preferably at least 500 pm and at most 2000 pm.
  • the shape of the corrugated structure is not particularly important, but it must be pronounced enough that the non-woven fabric can be pushed together more easily in the transverse direction than with the same non-woven fabric without a corrugated structure.
  • the wave height and wavelength can also vary significantly within a cross-sectional area. This is not important for the inventive effect as long as the wavelength and the wave height are in the specified intervals over a large part of the cross-sectional area, in particular over at least 60%, preferably at least 75% of the cross-sectional area.
  • the wavy structure does not have to be pronounced on the upper and lower side of the non-woven fabric, it is sufficient if it is pronounced on one side, since the resulting thin areas in the troughs of the waves also make it easier for the non-woven fabric to be pushed together in the transverse direction and thus reduce the pressure required for pleating during segment manufacture.
  • the roughness of the surface alone is generally not sufficient to achieve the inventive effect.
  • the corrugated structure of the non-woven fabric can be determined by embedding a sample of the non-woven fabric in a suitable epoxy resin. After the epoxy resin has cured, the sample can be ground in the cross-sectional plane of the nonwoven or cut through a microtome so that the cross-sectional area is visible under a light microscope. With a light microscope, the wave structure can be made visible and the wave height and wave length can be measured. A camera connected to the light microscope can be used to create the images of sections of the cross-sectional area.
  • wave height and wavelength are sufficiently met for the inventions if they are met in representative sections of a cross-sectional area. Due to the manufacturing process, the wave structure generally changes only insignificantly in the longitudinal direction of the nonwoven, so that it is not necessary to carry out such a measurement on several cross-sectional areas in the longitudinal direction to check the requirements for wave height and wavelength.
  • a scanning electron microscope can also be used as an alternative to a light microscope.
  • the hydroentangled nonwoven contains cellulose fibers, fibers made from regenerated cellulose or a mixture thereof in an amount of at least 50% and at most 100% of the mass of the hydroentangled nonwoven .
  • the amount of these fibers is preferably at least 60% and at most 95%, in each case based on the mass of the hydroentangled nonwoven.
  • the cellulose fibers can preferably be obtained from conifers, deciduous trees or other plants such as hemp, flax, jute, ramie, kenaf, kapok, coconut, abaca, sisal, cotton or esparto grass. Also mixtures of cellulose fibers from different origins can be used.
  • the cellulose fibers are particularly preferably obtained from coniferous woods, for example from spruce, pine or fir, because these fibers lead to good strength of the hydroentangled nonwoven fabric due to their length. Pulp obtained from softwoods, which is referred to as reinforced pulp and achieves particularly high strength, and mercerized cellulose, which achieves particularly high thickness and low density, are very particularly preferred.
  • the pulp fibers can be bleached or unbleached.
  • Bleached cellulose fibers offer advantages in the appearance of a segment made from the filter material according to the invention because of their white color, while unbleached cellulose fibers, which then have a light brown to dark brown color, are more environmentally friendly because the bleaching process can be omitted.
  • Mixtures of bleached and unbleached cellulose fibers can also be used to better adjust the color of the filter material according to the invention.
  • the fibers made from regenerated cellulose are preferably viscose fibers, modal fibers, Lyocell®, Tencel® or mixtures thereof. These fibers have good biodegradability and can be used to optimize the strength, thickness or density of the hydroentangled nonwoven fabric and adjust the filtration efficiency of the resulting smoking article segment.
  • the filter material according to the invention comprises a hydroentangled nonwoven fabric which consists essentially exclusively, but at least to at least 95% of the mass of the hydroentangled nonwoven fabric of cellulose fibers, fibers of regenerated cellulose or a mixture thereof.
  • This very particularly preferred embodiment permits very good biodegradability and rapid disintegration on contact with water, while at the same time having a very small impact on the taste of the smoking article made with the help of the filter material.
  • the hydroentangled nonwoven fabric of the filter material contains at least 5% and less than 50%, particularly preferably less than 40% and very particularly preferably less than 30% staple fibers made of cellulose acetate, the percentages based on the mass of the hydrojet related non-woven fabric.
  • Additives such as alkyl ketene dimers (AKD), alkenyl succinic anhydrides (ASA), fatty acids, starch, starch derivatives, carboxymethyl cellulose, alginates, or substances for adjusting Adjusting the pH value, such as organic or inorganic acids and salts thereof or bases, can be added to adjust specific properties of the nonwoven fabric.
  • the person skilled in the art is able to determine the type and amount of such additives from his experience.
  • the basis weight of the hydroentangled nonwoven is preferably at least 25 g/m 2 and at most 150 g/m 2 , particularly preferably at least 35 g/m 2 and at most 120 g/m 2 and very particularly preferably at least 40 g/m 2 and at most 100 g / m2 .
  • the basis weight influences the tensile strength of the hydroentangled nonwoven fabric, with a higher basis weight leading to higher strength.
  • the thickness of the hydroentangled nonwoven is preferably at least 100 ⁇ m and at most 1000 ⁇ m, particularly preferably at least 120 ⁇ m and at most 800 ⁇ m and very particularly preferably at least 150 ⁇ m and at most 750 ⁇ m.
  • the thickness affects the amount of filter material that can be packed into the segment of the smoking article and thus the draw resistance and filtration efficiency of the segment, but also the processability of the filter material, since a high thickness makes it difficult to pleat the filter material.
  • the filter material according to the invention allows a higher thickness due to the corrugated structure of the non-woven fabric, without problems arising during pleating. Therefore, a filter material according to the invention can be used particularly well if segments with high density and high train resistance are to be produced.
  • the thickness measurement is influenced by the corrugated structure of the material. However, this fact is ignored when specifying the thickness, because the thickness measured in this way also serves as a measure of how much filter material can be rolled up on a roll with a given diameter. Thickness can be adjusted according to EDANA Standard Procedure NWSP 120.6. Ro (15) can be measured.
  • the density of the hydroentangled nonwoven is obtained by dividing the basis weight by the thickness.
  • the density of the hydroentangled nonwoven is preferably at least 50 kg/m 3 and at most 300 kg/m 3 , particularly preferably at least 70 kg/m 3 and at most 250 kg/m 3 and very particularly preferably at least 80 kg/m 3 and at most 220 kg/ m3 . These values relate to the density before a segment of a smoking article is manufactured from the filter material according to the invention, which comprises this hydroentangled nonwoven fabric.
  • the density of the hydroentangled nonwoven determines, among other things, the draw resistance and the filtration efficiency of the segment of a smoking article made from it. The preferred intervals allow for a favorable combination of draw resistance and filtration efficiency.
  • the mechanical properties of the hydroentangled nonwoven are important for processing the filter material according to the invention into a segment for a smoking article.
  • the width-related tensile strength of the hydroentangled nonwoven is preferably at least 0.05 kN/m and at most 5 kN/m, particularly preferably at least 0.07 kN/m and at most 4 kN/m.
  • the elongation at break of the hydroentangled nonwoven is important because the filter material is pleated during the processing of the filter material according to the invention to form a segment of a smoking article, and a particularly high elongation at break is favorable.
  • the corrugated structure of the non-woven material allows a particularly high elongation at break in the transverse direction and makes pleating easier when manufacturing the segment.
  • the elongation at break in the transverse direction of the hydroentangled nonwoven fabric is preferably at least 1% and at most 50% and particularly preferably at least 3% and at most 40%.
  • Tensile strength and elongation at break can depend on the direction in which the sample for measurement was taken from the hydroentangled nonwoven fabric. The requirements for the tensile strength of the hydroentangled nonwoven are met if the tensile strength in at least one direction is within the specified preferred or particularly preferred intervals. The elongation at break is given in the transverse direction and must be measured.
  • the filter material according to the invention comprises the hydroentangled nonwoven.
  • the hydroentangled nonwoven preferably makes up the majority of the filter material, so that preferably at least 80% of the mass of the filter material is formed by the hydroentangled nonwoven and particularly preferably at least 90% of the mass of the filter material is formed by the hydroentangled nonwoven.
  • the filter material according to the invention can also include other components which, for example, influence the processability of the filter material or the properties of a segment made from it or the taste of the smoking article.
  • these include, for example, impregnation of the nonwoven with flavorings, carriers of flavorings, in particular threads impregnated with flavorings or substances to increase the rigidity of the filter material or materials that increase the hardness of the filter made from the filter material.
  • the filter material comprises the hydroentangled nonwoven and one or more substances selected from the group consisting of triacetin, glycol, propylene glycol, sorbitol, glycerol rol, polyethylene glycol, polyvinyl alcohol and tri-ethyl citrate or mixtures thereof. These substances can help to better match the filtration efficiency to that of cellulose acetate.
  • the fulfillment of the above-mentioned characteristics of the hydroentangled nonwoven fabric for example with regard to the content of cellulose fibers, the content of fibers from regenerated cellulose, the density, the thickness, the basis weight, the tensile strength and the elongation at break can also be tested on the filter material itself, without the hydroentangled nonwoven having to be isolated from the filter material.
  • the above-mentioned preferred, particularly preferred and very particularly preferred intervals and properties according to the invention then also apply to the filter material made from the hydroentangled nonwoven.
  • Segments for smoking articles according to the invention can be produced from the filter material according to the invention by methods known from the prior art. These methods include, for example, pleating the filter material, forming a continuous strand from the pleated filter material, wrapping the continuous strand with a wrapping material, and cutting the wrapped strand into individual rods of defined length. In many cases, the length of such a rod is an integer multiple of the length of the segment then to be used in the smoking article of the present invention, and therefore the rods are then cut into segments of the desired length before or during manufacture of the smoking article.
  • the segment for smoking articles according to the invention comprises the filter material according to the invention and a wrapping material.
  • the segment is cylindrical with a diameter of at least 3 mm and at most 10 mm, particularly preferably at least 4 mm and at most 9 mm and very particularly preferably at least 5 mm and at most 8 mm. These diameters are favorable for using the segments according to the invention in smoking articles.
  • the segment has a length of at least 4 mm and at most 40 mm, particularly preferably at least 6 mm and at most 35 mm and very particularly preferably at least 10 mm and at most 28 mm.
  • the draw resistance of the segment determines, among other things, what pressure difference the smoker must apply when consuming the smoking article in order to generate a certain volume flow through the smoking article, and it therefore has a significant influence on the smoker's acceptance of the smoking article.
  • the draw resistance of the segment can be measured according to ISO 6565:2015 and is given in mm water column (mmWG).
  • the tensile resistance of the segment is proportional to the length of the segment, so that the tensile resistance can also be measured on rods that differ from the segment only in length. From this, the tensile resistance of the segment can be easily calculated.
  • the tensile strength of the segment per length of the segment is preferably at least 1 mmWG/mm and at most 12 mmWG/mm and particularly preferably at least 2 mmWG/mm and at most 10 mmWG/mm.
  • the covering material of the segment according to the invention is preferably paper or foil.
  • the covering material of the segment according to the invention preferably has a basis weight of at least 20 g/m 2 and at most 150 g/m 2 , particularly preferably at least 30 g/m 2 and at most 130 g/m 2 .
  • a covering material with this preferred or particularly preferred weight per unit area gives the segment covered therewith according to the invention a particularly advantageous hardness. This prevents the smoker from accidentally squeezing the segment located in the smoking article.
  • the segment according to the invention additionally contains at least one capsule containing flavorings.
  • the capsule is often designed in such a way that the smoker can break it by applying pressure with his fingers, thereby releasing the flavorings so that they can change the taste of the smoking article.
  • Smoking articles according to the invention can be produced from the segment according to the invention by methods known in the prior art.
  • the smoking article of the invention comprises a segment containing an aerosol forming material and a segment comprising the filter material of the invention and a wrapper material.
  • the smoking article is a filter cigarette and the aerosol forming material is tobacco.
  • the smoking article is a smoking article which, when used as intended, only heats the aerosol-forming material but does not burn it.
  • the hydroentangled nonwoven fabric for the filter material according to the invention can be produced by the following method according to the invention, which comprises the following steps A to D.
  • step D Drying the hydroentangled nonwoven fabric, wherein the proportion of said fibers in the fibrous web of step A is chosen such that these fibers total in an amount of at least 50% and at most 100% of the mass of the hydroentangled nonwoven fabric in the dried state from step D are, wherein the fibrous web provided in step A has a longitudinal direction in the running direction of the fibrous web, a transverse direction orthogonal thereto lying plane in the fibrous web and a thickness direction orthogonal to the longitudinal direction and transverse direction, and the water jets directed onto the fibrous web are arranged in step C in such a way, that they are at a distance from each other of at least 150 pm and at most 5000 pm in the transverse direction from center to center of the water jet when it strikes the fibrous web and the pressure of each water jet in step C is at least 2 MPa and at most 70 MPa, and that in step D non-woven fabric obtained in the out Transverse direction and thickness direction spanned plane has a wave structure with a wave height of at least 50 pm and at
  • a water jet at a correspondingly high pressure is suitable for producing a depression in the nonwoven fabric passing under the water jet, which can be perceived as a wave trough in the cross-sectional area.
  • This requires a pressure of at least 2 MPa, but the pressure depends very significantly on the speed at which the fibrous web runs through the device. At higher higher pressure is required.
  • the fibers are not only swirled, but also partially displaced, which contributes significantly to the formation of the wave structure.
  • the fibrous web is typically supported by a wire and the structure of the wire should also preferably be chosen to be suitable for the intended corrugated structure, since the fibers are mainly displaced to where the wire is permeable.
  • the water jets are not arranged in defined positions with respect to the fiber web when water-jet bonding a nonwoven fabric, but in such a way that uniform bonding by the water jets can be achieved over the entire surface of the fiber web passing through.
  • the pressure of the water jets exceeds 2 MPa, this does not lead to a wave structure as is characteristic of the filter material according to the invention.
  • the water jets used to generate the wave structure must therefore be arranged accordingly, in particular in such a way that water jets with high pressure are not directed at locations on the fiber web where a wave crest is to be generated.
  • the water jets, which are intended to produce the corrugated structure in step C, are therefore offset in the transverse direction and have a distance from one another in the transverse direction from center to center of the water jets at the point where they occur on the fibrous web of at least 150 ⁇ m and at most 5000 ⁇ m.
  • These water jets may be arranged in any longitudinal direction.
  • step B or C It is also possible to direct water jets to both sides of the fibrous web to carry out step B or C.
  • the water jets in step C are preferably arranged in such a way that they hit points that are intended to form wave troughs when viewed from the respective side.
  • the pressure of the water jets, which are used in step B to strengthen the nonwoven fabric, can also exceed 2 MPa and can also be selected to be significantly higher, especially at higher speeds of the fiber web. According to the invention, it is only important that the effect of all the water jets together is not distributed so evenly over the surface of the fibrous web that no wavy structure can arise.
  • a water jet to produce the corrugated structure in step C requires a pressure of at least 2 MPa and at most 70 MPa. According to the inventors' findings, no pronounced wave structure can be produced at a pressure of less than 2 MPa, and at a pressure of more than 70 MPa, the wave structure exists even at higher speeds Danger of cutting the fibrous web.
  • the pressure of the water jets in step C is preferably at least 3 MPa and at most 40 MPa.
  • the pressure for generating the corrugated structure can be selected as a function of the running speed of the fibrous web, so that the ratio p/v of the pressure p in MPa and the running speed v of the fibrous web in m/s is preferably selected such that 2.5 applies ⁇ p/v ⁇ 20 and more preferably 3 ⁇ p/v ⁇ 15.
  • the water jets in step C exit from an orifice which has an area of at least 450 ⁇ m 2 and at most 50000 ⁇ m 2 , and most preferably is a circular orifice.
  • the pressure of the water jets in step B is preferably at least 0.5 MPa and at most 60 MPa, particularly preferably at least 1 MPa and at most 50 MPa, with high pressure being combined above all with high speeds of the fibrous web in order to cut the fibrous web impede.
  • the pressure for consolidating the fibrous web can be selected depending on the running speed of the fibrous web, so that the ratio p/v from the pressure p in MPa and the running speed v of the fibrous web in m/s is preferably chosen such that 2 ⁇ p/v ⁇ 10 and more preferably 4 ⁇ p/v ⁇ 8.
  • the wave structure is characterized by the wave height and wavelength that can be seen in the cross-sectional area of the nonwoven.
  • the wave height after step D is at least 50 ⁇ m and at most 1000 ⁇ m, preferably at least 100 ⁇ m and at most 900 ⁇ m and particularly preferably at least 150 ⁇ m and at most 800 ⁇ m.
  • the wavelength after step D is at least 150 ⁇ m and at most 5000 ⁇ m, preferably at least 300 ⁇ m and at most 4000 ⁇ m and particularly preferably at least 500 ⁇ m and at most 2000 ⁇ m.
  • the hydroentangled nonwoven produced by this process is said to be suitable for use in the filter material described above. This means that it can in particular have all the features, individually or in combination, which have been described above in connection with the hydroentangled nonwoven fabric as a component of the filter material and are defined in the claims directed to the filter material.
  • the fibrous web can be provided in step A by various methods, for example by a wet-laid method or a dry-laid method (air-laid).
  • the fibrous web is provided in step A by a wet-laid method comprising the sub-steps Ai.i to A1.3,
  • A1.1 - Preparation of an aqueous suspension comprising fibers selected from the group consisting of cellulose fibers, regenerated cellulose fibers and mixtures thereof, the amount of these fibers being selected such that these fibers in total are present in an amount of at least 50% and at most 100% of the mass of the hydroentangled nonwoven fabric are contained in the dried state of step D,
  • A1.4 Adjusting the moisture content of the fibrous web by drying or moistening.
  • the aqueous suspension in step A1.1 has a solids content of at least 0.005% and at most 3.0%, particularly preferably at least 0.005% and at most 1.0%, very particularly preferably at least 0 .01% and at most 0.2% and in particular at least 0.01% and at most 0.05%.
  • the particularly low solids content of the suspension makes it possible to form an even less dense fibrous web in step A1.3.
  • the variant of the inventive method Ai is the circulating sieve of steps A1.2 and A1.3 in the running direction of the fiber web against the horizontal by an angle of at least 3 0 and at most 40 °, particularly preferably by an angle of at least 5 0 and not more than 30 ° and most preferably at an angle of at least 15 and at most 25 0 0 inclined upwardly.
  • dewatering is supported in step A1.3 by generating a pressure difference between the two sides of the rotating screen, with the pressure difference being particularly preferably generated by vacuum boxes or suitably shaped vanes.
  • drying in step A1.4 takes place using heated drying cylinders or using hot air, and moistening takes place using a spray bar.
  • the drying process and the subsequent moistening serve to optimally adjust the moisture content of the fibrous web for the water jet bonding in step B.
  • the fibrous web can first be dried approximately to equilibrium moisture content at normal room temperature and atmospheric humidity, after which the fibrous web is rolled up into a separate device transported, which carries out the hydroentanglement, unrolled there and the moisture content for the subsequent step B is adjusted with a spray bar.
  • the fibrous web is provided in step A by means of a dry laying method (“air-laid”) comprising the sub-steps A2.1 and A2.2,
  • A2.1 - Manufacture of a fibrous web by an air-laid process the fibrous web comprising fibers selected from the group consisting of wood pulp fibers, regenerated cellulose fibers and mixtures thereof, the amount of these fibers being so is chosen that these fibers are contained in total in an amount of at least 50% and at most 100% of the mass of the hydroentangled nonwoven fabric in the dried state of step D, and A2.2 - moistening the fibrous web.
  • Such a dry-laying method of variant A2 can bring advantages because, for example, the energy-intensive drying in step A1.4 of variant Ai can be omitted.
  • the drying in step D is effected at least partially by contact with hot air, by infrared radiation or by microwave radiation.
  • the drying in step D is carried out by through-flow drying.
  • TAD through-air drying
  • the fiber material is dried in that a warm gas flow, in particular an air flow, is forced through the fiber material.
  • TAD through-air drying
  • the best quality of the hydroentangled nonwoven can be achieved. Drying by direct contact with a heated surface is also possible, but less preferred because the corrugated structure of the hydroentangled nonwoven can be destroyed.
  • FIG. 1 shows a device by means of which the method according to the invention for producing the hydroentangled nonwoven can be carried out.
  • FIG. 2 shows, by way of example, the determination of the wave height and wave length of the wave structure of the nonwoven
  • FIG. 3 shows the cross-sectional area of the nonwoven for a filter material according to the invention
  • FIG. 4 shows the cross-sectional area of a filter material not according to the invention after pleating
  • water jets 11 arranged in three rows in the transverse direction to the fibrous web 4 were directed onto the fibrous web 4 from devices 6 in order to entangle the fibers and solidify the fibrous web 4 into a nonwoven fabric.
  • additional devices 7 were used to direct water jets 12 at higher pressure onto the fiber web 4 in order to produce the wave structure explained above. Unlike the devices 6, the devices 7 were adjusted in such a way that the water jets 12 of the two longitudinally consecutive rows were directed as far as possible to the same position in the transverse direction.
  • the water jets 12 of the second row were directed onto the wave troughs generated by the water jets 12 of the first Rei, thereby reinforcing the wave structure generated by the first row.
  • Optional devices 6a can direct further water jets 11a onto the fibrous web, whereby these water jets, depending on the arrangement and pressure, can serve both to solidify the nonwoven fabric and to generate or reinforce the corrugated structure.
  • the water jets of the devices 6a can also be directed onto the fiber web 4 from the same side as the water jets. radiate 11 or 12.
  • the nonwoven fabric which was still moist, then went through a through-air drying 8 and was dried there.
  • a mixture of 80% by weight cellulose fibers and 20% by weight Lyocell® fibers was used to produce the hydroentangled nonwoven fabric.
  • the fibers were consolidated by three series of water jets 11 generated at a pressure of 3 MPa, 5 MPa and 6 MPa, relative to the running direction.
  • the corrugated structure of the non-woven fabric was effected by two rows of water jets 12 generated in both rows with a pressure of 8.5 MPa.
  • the devices 7 for generating the water jets 12 were arranged in both rows in the transverse direction at a distance of 2000 mih and had a diameter of 100 mih.
  • the speed of the fibrous web was 50 m/min, which is relatively low. At higher speeds, the pressures of the water jets 11 and 12 must be increased accordingly.
  • the basis weight of the nonwoven produced in this way was 49.6 g/m 2 , the thickness according to NWSP 120.6.
  • Ro (15) was determined to be 522 ⁇ m and the density to be 95 kg/m 3 .
  • the tensile strength in the longitudinal direction was 8.6 N/15 mm, the elongation at break in the transverse direction was 31%.
  • a sample of the non-woven fabric was embedded in epoxy resin, and after the epoxy resin had hardened, the sample was cut with a microtome so that the cross-sectional plane formed by the transverse direction and the thickness direction was visible under an optical microscope. An image of the cross section was taken under the light microscope and the wave structure was measured with regard to wave height and wavelength.
  • FIG. 2 shows, by way of example, the determination of wave height and wave length of the wave structure of the nonwoven. If the nonwoven fabric 20 has a pronounced wave structure on both sides, then the wave height 21 is determined by the distance in the thickness direction 41 between the highest point of the wave crest 24 and the lowest point of the adjacent wave valley 23 on the same side.
  • the wavelength 22 is the distance in the transverse direction 40 between two points of the same phase of the wave structure, shown here by way of example as the distance between two adjacent wave crests 24 and 25 .
  • the wave height 31 is determined in the same way by the distance in the thickness direction 41 between the highest point of the wave crest 34 and the lowest point of the adjacent wave trough 33 on the same side.
  • the world Length 32 is the distance in the transverse direction 40 between two points of the same phase of the wave structure, shown here by way of example as the distance between two adjacent wave crests 34 and 35.
  • the wave height or the wavelength can be determined as a single value or as an average of several measurements, for example three measurements.
  • FIG. 3 shows the image of the cross-sectional area of the nonwoven fabric produced, taken under the light microscope.
  • a wave structure is clearly visible and the wave height 41 was determined to be 220 ⁇ m and the wavelength 42 to be 2030 ⁇ m.
  • the nonwoven fabric was used as the filter material according to the invention without the addition of further components, and a segment of a smoking article, covered with a wrapping paper with a basis weight of 78 g/m 2 , was produced from it.
  • the segment could be produced without any problems, in particular the pleating could be carried out with considerably reduced pressure. Further experiments showed that pleating could be dispensed with entirely without the production speed having to be reduced or the properties of the segment changing significantly.
  • FIG. 4 shows a non-inventive paper filter material made of 100% cellulose fibers, i.e. made of a material that is not hydroentangled, after it has been pleated by mechanical pressure between two rollers during the manufacture of a segment for a smoking article , but before a segment was made from it.
  • a cross-sectional sample of this filter material was also analyzed with the light microscope and the wave height and wavelength measured.
  • the wave height 51 was determined to be 390 ⁇ m and the wavelength 52 to be 2000 ⁇ m.
  • the corrugated structure of the filter material according to the invention is very similar to that of a filter material not according to the invention after pleating, so that the pleating of the filter material according to the invention can take place with significantly less pressure or can be omitted entirely.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Abstract

L'invention concerne un matériau filtrant destiné à la fabrication d'un segment pour un article à fumer, le matériau filtrant comportant un non-tissé hydrolié, et contenant les fibres de non-tissé, les fibres étant sélectionnées dans le groupe constitué de fibres cellulosiques, de fibres de cellulose régénérée et de mélanges de ces dernières, et ces fibres étant contenues ensemble dans le non-tissé dans une quantité de minimum 50% et de maximum 100% de la masse du non-tissé hydrolié, et le non-tissé étant en forme de bande et présentant une direction longitudinale dans le sens de défilement de la bande, une direction transversale perpendiculairement au plan de la bande et une direction d'épaisseur perpendiculaire à la direction longitudinale et à la direction transversale. Le non tissé est formé de façon à présenter dans le plan défini à partir de la direction transversale et de la direction d'épaisseur, une structure d'ondulations d'une hauteur d'ondulation de minimum 50 µm et de maximum 1000 µm, ainsi que d'une longueur d'ondulations de minimum 150 µm et de maximum 5000 µm.
EP21748622.4A 2020-07-22 2021-07-22 Matériau filtrant plissé pour article à fumer Pending EP4064884A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020119388.2A DE102020119388B4 (de) 2020-07-22 2020-07-22 Plissiertes filtermaterial für rauchartikel
PCT/EP2021/070473 WO2022018180A1 (fr) 2020-07-22 2021-07-22 Matériau filtrant plissé pour article à fumer

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EP4064884A1 true EP4064884A1 (fr) 2022-10-05

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US (1) US20230284678A1 (fr)
EP (1) EP4064884A1 (fr)
JP (1) JP2023534469A (fr)
KR (1) KR20230043104A (fr)
CN (1) CN116133538A (fr)
BR (1) BR112023000478A2 (fr)
DE (1) DE102020119388B4 (fr)
WO (1) WO2022018180A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102021115450A1 (de) * 2021-06-15 2022-12-15 Delfortgroup Ag Filtermaterial für rauchartikel mit verbessertem dehnungsverhalten
DE102021115456A1 (de) * 2021-06-15 2022-12-15 Delfortgroup Ag Filtermaterial für segmente für rauchartikel mit reduzierter kriechneigung
KR20230147314A (ko) * 2022-04-14 2023-10-23 주식회사 케이티앤지 라이오셀 토우를 포함하는 담배 필터 및 이의 제조방법
KR20230149942A (ko) * 2022-04-21 2023-10-30 주식회사 케이티앤지 기능성 향상 바인더가 적용된 필터 및 이를 포함하는 흡연 물품

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Publication number Priority date Publication date Assignee Title
FR2314679A1 (fr) * 1975-06-19 1977-01-14 Job Ets Bardou Job Pauilhac Procede et dispositif pour la realisation d'un nouveau type de structure filtrante pour filtres a cigarettes, filtres obtenus et cigarettes equipees de ce filtre
US4488563A (en) * 1982-04-29 1984-12-18 Mitsubishi Acetate Co., Ltd. Filter plug
US5053066A (en) * 1990-05-04 1991-10-01 Hassenboehler Charles B Nonwoven filter and method of manufacture
DE102005017478A1 (de) 2005-04-15 2006-10-19 Reemtsma Cigarettenfabriken Gmbh Tabakrauchfilter
EP3013451B1 (fr) * 2013-06-26 2022-04-20 Papeteries de Mauduit Élément filtrant comprenant un web de base et procédé de fabrication d'un papier ayant des propriétés de filtrage et formant le dit web de base

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DE102020119388B4 (de) 2023-08-17
BR112023000478A2 (pt) 2023-01-31
CN116133538A (zh) 2023-05-16
US20230284678A1 (en) 2023-09-14
WO2022018180A1 (fr) 2022-01-27
DE102020119388A1 (de) 2022-01-27
JP2023534469A (ja) 2023-08-09
KR20230043104A (ko) 2023-03-30

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