EP4210517B1 - Device for filtering smoke - Google Patents

Description

• im ersten Abschnitt ein erstes Vliesfiltermaterial,
• im zweiten Abschnitt ein poröses Filtermaterial, und
• im dritten Abschnitt ein zweites Vliesfiltermaterial vorgesehen sind.

The invention relates to a device for filtering smoke, in particular a tobacco and/or cannabis cigarette filter, with a jacket which is formed by a filter wrapping paper, at least a first section, a second section and a third section being provided in the jacket , wherein the second section is arranged between the first section and the third section, wherein

• in the first section a first fleece filter material,
• in the second section a porous filter material, and
• A second fleece filter material is provided in the third section.

Conventional cigarette filters often only have a cellulose acetate filter. Filters are also known in which activated carbon is provided between two ceramic discs. The ceramic discs have holes for the air flow. By using activated carbon as a filter, a higher proportion of toxins such as tar and benzene rings can be filtered out of the smoke. Unfortunately, activated carbon dust can also penetrate through the holes in the ceramic discs, which is then inhaled by a person smoking.

In addition, it shows US 2003/0106562 A1 a filter cigarette with three sections. The first section contains cellulose acetate fibers as a mouthpiece, the second section contains activated carbon and the third section again contains cellulose acetate fibers as a barrier between activated carbon and tobacco. The disadvantage of these filter cigarettes is that the passage through the cigarette filter is severely impaired. Furthermore, it is not possible for a smoker to cool the smoke before inhalation and the taste is adversely affected. Disadvantageously, the cigarette filters with three sections known in the prior art are also not suitable for use with cannabis cigarettes or tobacco cannabis cigarettes due to their too short length or filter performance.

Furthermore, they show EP 1 413 212 A1 , the WO 2017/132709 A1 , the US 3,547,009 A and the US 3,658,069 A Cigarette filters, whereby EP 1 413 212 A1 a device with the features in the preamble of present claim 1 is disclosed.

It is an object of the invention to overcome one or more disadvantages to alleviate or remedy the state of the art. In particular, it is an object of the invention to propose a device for filtering smoke that has less of an impact on the passage through the device and achieves good filtering performance. Preferably, cooling of the smoke is made possible and the taste is less adversely affected. A smoke filtering device suitable for use with cannabis cigarettes or tobacco cannabis cigarettes is preferably proposed.

This is achieved by a device for filtering smoke as mentioned at the beginning, a fourth section being provided in the jacket, the third section being arranged between the second section and the fourth section and the fourth section being set up so that in one Flow through the casing, a pressure drop across the fourth section is less than a pressure drop across the third section, the fourth section having a support element which supports the casing in the area of the fourth section,
wherein the porous filter material is activated carbon.

By providing a fourth section in which a lower pressure drop occurs during a flow through the device, specifically through the jacket, than in the third section, the passage through the device is improved. In particular, the fourth section allows the smoke to be cooled without impairing the draft. At the same time, desired aromatic substances are transported better through the device. Using the fourth section, a greater length can also be achieved without impairing the draft. This also improves the feel.

The first fleece filter material primarily filters tar, nicotine and condensates from the smoke. The porous filter material primarily filters aromatic compounds, para-benzoquinone and carbonyl compounds (especially acetaldehydes, acetones, acrolein, crotonaldehydes, propionaldehydes) from the smoke. The second fleece filter material serves primarily to filter dust (for example activated carbon dust) that is carried by the flow of the porous filter material. It is advantageous if the second fleece filter material only filters a small amount of aromatic substances from the smoke (particularly compared to the first fleece filter material, which serves to primarily filter the smoke).

The jacket delimits/surrounds the first, second, third and fourth sections in the radial direction. Preferably, the jacket forms a closed casing (in the radial direction) from the end of the first section (facing away from the fourth section) to the end of the fourth section (facing away from the first section). The jacket preferably has bleached and/or unbleached paper (in particular with a thickness of between 60 and 100 mg/m ² ). The jacket is preferably open in the direction of the two base surfaces. An end is understood to mean an end surface in the axial direction. The jacket preferably has the shape of a surface of revolution. In particular, the jacket has the shape of the lateral surface of a straight circular cylinder or is hollow cylindrical. The jacket is formed by a filter wrapping paper. The jacket has a wall thickness (in the radial direction) of preferably less than 0.5 mm, particularly preferably less than 0.2 mm. The jacket has a diameter of preferably between 3 mm and 15 mm, particularly preferably between 5 mm and 8 mm, even more preferably between 6 mm and 7 mm, in particular essentially 6.4 mm. The axial direction of the shell runs through the shell and is orthogonal to the radial direction of the shell. The axial or radial direction of the device and the sections correspond to the axial or radial direction of the jacket. The axial direction of the device is the longitudinal direction of the device.

At least one substance, in particular a pollutant, is filtered out of the smoke as it flows through the device, in particular through the casing. In particular, the smoke is the smoke produced when smoking a cigarette. In the context of this disclosure, a cigarette may contain tobacco and/or cannabis and/or other smokable substances.

The arrangement of the sections in the axial direction is in the following order: first section, then second section, then third section, then fourth section. The fourth section is preferably the section close to the mouth and the first section is the section away from the mouth. The first and second sections are preferably directly adjacent to one another. The second and third sections are preferably directly adjacent to one another. The third and fourth sections are preferably directly adjacent to one another. The first section has a length in the axial direction of preferably between 3 and 14 mm, particularly preferably between 5 and 10 mm, even more preferably between 6 and 8 mm, in particular essentially 7 mm. The second section has a length in the axial direction of preferably between 4 and 20 mm, particularly preferably between 6 and 15 mm, even more preferably between 8 and 12 mm, in particular essentially 9 mm. The third section has a length in the axial direction of preferably between 3 and 14 mm, particularly preferably between 5 and 10 mm, even more preferably between 6 and 8 mm, in particular essentially 7 mm. The fourth section has a length in the axial direction of preferably between 3 and 14 mm, particularly preferably between 5 and 10 mm, even more preferably between 6 and 8 mm, in particular essentially 7 mm.

The first fleece filter material is in particular in the form of a cylindrical filter. The second fleece filter material is in particular in the form of a (further) cylindrical filter. The first fleece filter material preferably essentially fills the first section. The second fleece filter material preferably essentially fills the third section. The first fleece filter material preferably rests circumferentially on the first section. The second fleece filter material preferably rests circumferentially on the third section. The porous filter material is present in particular as a granular porous filter material in the second section. That is, the porous filter material is preferably granules. Preferably, the second section is delimited in the axial direction by the first fleece filter material and the second fleece filter material.

The flow is in particular the flow of the smoke. The flow is created in particular by creating a negative pressure at the end of the jacket that is closer to the fourth section than the first section. The flow flows from the end of the jacket closer to the fourth section to the end of the jacket closer to the first section. Pressure drop over a section is understood to mean the difference in the pressure before the respective section (upstream) minus the pressure after the respective section (downstream). The pressure drop is determined in particular according to ISO 6565:2015. The pressure drop over the fourth section is preferably less than 0.5 times, particularly preferably less than 0.2 times, even more preferably less than 0.1 times, the pressure drop over the third section. Preferably, the third section and the fourth section are set up so that when there is a flow through the jacket, a pressure drop across the fourth section is lower than a pressure drop across the third section. The pressure drop across the fourth section is preferably less than 10 mm WG, particularly preferably less than 5 mm WG, even more preferably less than 1 mm WG. 1 mm WG (mm water column) corresponds to 9.8067 Pa.

The above-mentioned object is also achieved by a device for filtering smoke as mentioned at the beginning, a fourth section being provided in the jacket, the third section being arranged between the second section and the fourth section and the fourth section having a cavity , which runs from the end of the fourth section facing the third section to the end of the fourth section facing away from the third section. The preferred developments listed in this disclosure can also be provided in the device described in this paragraph.

It is advantageous if the fourth section has a cavity which runs from the end of the fourth section facing the third section to the end of the fourth section facing away from the third section. In particular, the cavity is open to the outside. The cavity has a cross-sectional area (orthogonal to the axial direction) which is preferably between 10% and 90%, particularly preferably between 20% and 80%, even more preferably between 40% and 70%, of the cross-sectional area of the (entire) fourth section coat corresponds. So you can In a simple way, a greater length of the device can be achieved without impairing the draft. In particular, smoke cooling is achieved in a simple manner. The cavity preferably has a cross-section that remains constant in the axial direction. The cavity is preferably circular in cross section. The cavity is preferably cylindrical.

It is envisaged that the fourth section has a support element which supports the casing in the area of the fourth section. The support element improves the stability of the device in the area of the fourth section and prevents the casing in the area of the fourth section from being compressed when the device is normally held. Preferably, an outer surface of the support element adjoins an inner surface of the jacket, in particular over the entire length of the fourth section. The support element preferably forms the cavity. The support element preferably extends over the entire length of the fourth section (in the axial direction). The support element preferably comprises bleached and/or unbleached cellulose acetate fibers, plastic, paper and/or cardboard. The support element preferably has a mass density that is greater than the mass density of the first non-woven filter material and/or the second non-woven filter material and is preferably at least 1.5 times as large as the mass density of the first non-woven filter material and/or the second non-woven filter material.

It is advantageous if the support element is hollow cylindrical. This allows smoke to flow through the hole in the hollow cylinder while the jacket is supported.

It is advantageous if the fourth section has a length in the longitudinal direction of the device of at least 2 mm, preferably at least 4 mm, particularly preferably at least 6 mm. In particular, the fourth section has a length in the longitudinal direction of the device of essentially 7 mm. This allows improved cooling of the smoke to be achieved.

It is advantageous if an inner jacket is provided in the jacket, which extends over the first section, the second section and the third section, with the first fleece filter material, the porous filter material and the second fleece filter material being arranged within the inner jacket. It is preferred if the first fleece filter material and the second fleece filter material are at least partially glued to the inner casing. This makes it possible to achieve better filtering and, for example, prevent activated carbon dust from getting past the second fleece filter material and thus out of the jacket, where the dust would be inhaled by a person smoking. Furthermore, the production of the device can be simplified because the inner jacket, together with the first and second fleece filter material, enclose the porous filter material. The inner jacket can then simply be placed in the jacket. The inner jacket is preferably in the shape of a cylinder surface or hollow cylindrical. Preferably, an outer surface of the inner casing is glued at least in places to an inner surface of the casing. In particular, full bonding is provided at at least one axial position. Preferably, the inner jacket is glued to the jacket on at least one circumferential section over the entire length of the inner jacket (in the axial direction).

It is advantageous if the first section and the third section are set up so that when there is a flow through the jacket, a pressure drop across the first section is greater than the pressure drop across the third section. This ensures that good filter performance is achieved in the first section, whereas the third section allows as many aromatic substances as possible to pass through. The first section is intended in particular to filter a large proportion of the tar contained in the smoke. The pressure drop over the third section is preferably between 10 and 30 mm WG, particularly preferably between 15 and 25 mm WG. The pressure drop over the first section is preferably between 30 and 60 mm WG, particularly preferably between 35 and 45 mm WG.

It is advantageous if the pressure drop over the first section is at least 1.2 times, preferably at least 1.5 times, particularly preferably 1.8 times, the pressure drop over the third section. The pressure drop over the first section is in particular twice the pressure drop over the third section. A ratio is thus achieved in which the passage is hindered as little as possible, while the first fleece filter material filters out as much tar as possible from the smoke.

It is advantageous if a pressure drop per unit length in the first section is greater than a pressure drop per unit length in the third section. The first section and the third section can therefore advantageously have comparable lengths, with the pressure drop over the third section still being lower than the pressure drop over the first section. The pressure drop per unit length in a section is the pressure drop across the section divided by the length of the section. The pressure drop per unit length in the first section is preferably at least 1.2 times, particularly preferably at least 1.5 times, even more preferably 1.8 times, the pressure drop per unit length over the third section.

It is advantageous if the first fleece filter material has a greater density (i.e. mass density) than the second fleece filter material. The density of the first fleece filter material is preferably more than 1.1 times, particularly preferably more than 1.4 times, even more preferably more than 1.8 times the density of the second fleece filter material. The first fleece filter material is therefore also more stable than the second fleece filter material. Due to the higher density, the first fleece filter material is in particular more heat-resistant than the second fleece filter material. This is advantageous because the first section is preferably further away from the mouth than the third section and therefore the smoke flowing through the first section is hotter.

It is advantageous if between 60 and 140 mg, preferably between 75 and 125 mg, particularly preferably between 85 and 115 mg, of the porous filter material is provided in the second section are. In particular, essentially 100 mg of the porous filter material is provided in the second section. This allows particularly good filtering of pollutants from the smoke, with the negative influence on the draft or aroma being limited. Preferably only the second section has the porous filter material.

It is preferred if the first fleece filter material has bleached and/or unbleached cellulose acetate. In particular, the first fleece filter material is cellulose acetate.

It is advantageous if the second fleece filter material has bleached and/or unbleached cellulose acetate. In particular, the second fleece filter material is cellulose acetate.

It is intended that the porous filter material has activated carbon. Advantageously, the porous filter material is activated carbon. The activated carbon is present in particular as granules in the second section. The granules have a sieve size of preferably between 0.2 and 5 mm, particularly preferably between 0.5 and 2 mm, even more preferably essentially 1 mm. The granules are preferably 18x35 mesh granules. The porous filter material has a pore size volume of preferably between 0.2 and 2 cm ³ /g total pore volume, particularly preferably between 0.7 and 0.8 cm ³ /g total pore volume. The activated carbon preferably has a carbon tetrachloride activity (CTC) of at least 40, in particular substantially 50.

The invention further relates to a smoking article, in particular a tobacco cigarette, a cannabis cigarette or a tobacco-cannabis cigarette. The smoking article has a smokable substance. The smoking article includes a device for filtering smoke according to one of the embodiments described herein. The first section of the device preferably faces the smokable substance. Ie, the first section is far from the mouth and the fourth section is close to the mouth. The smoking article preferably has a smoking article jacket. The device and the smokable substance are provided in the smoking article casing. The smokable substance is preferably tobacco, cannabis or a mixture of these.

• Fig. 1 zeigt schematisch eine bevorzugte Ausführungsform einer Vorrichtung zum Filtern von Rauch in einer Schnittansicht.
• Fig. 2 zeigt schematisch dieselbe Ausführungsform der Vorrichtung wie Fig. 1 von vorne.
• Fig. 3 zeigt schematisch eine bevorzugte Ausführungsform eines Rauchartikels in einer Schnittansicht.

The invention will be explained in detail below using a preferred exemplary embodiment shown in the drawings, to which it should in no way be limited.

• Fig. 1 shows schematically a preferred embodiment of a device for filtering smoke in a sectional view.
• Fig. 2 shows schematically the same embodiment of the device as Fig. 1 from the front.
• Fig. 3 shows schematically a preferred embodiment of a smoking article in a sectional view.

Fig. 1 shows schematically a preferred embodiment of a device 1 for filtering smoke in a sectional view. Fig. 2 shows the same embodiment schematically from the front. The device 1 has a jacket 2. A first section 11, a second section 12, a third section 13 and a fourth section 14 are provided in the jacket 2. The second section 12 is arranged between the first section 11 and the third section 13. The third section 13 is arranged between the second section 12 and the fourth section 14. Fig. 2 shows the device 1 from a direction running from the first section 11 to the fourth section 14. The jacket 2 delimits the first section 11, the second section 12, the third section 13 and the fourth section 14 in a radial direction 10. The radial direction 10 is indicated by a dashed arrow. The axial direction 11 (ie longitudinal extension direction) of the jacket 2 and the device 1 runs orthogonally to the radial direction 10 and is also indicated by a dashed arrow.

A first fleece filter material 3 is provided in the first section 11. The first fleece filter material 3 is in particular cellulose acetate. A porous filter material 4 is provided in the second section 12. The porous filter material 4 is activated carbon in particular in the form of granules. In the third section 13, a second fleece filter material 5 is provided. The second fleece filter material 5 is in particular cellulose acetate.

The fourth section 14 is set up so that when there is a flow through the jacket 2 (in particular essentially in the axial direction 11), a pressure drop across the fourth section 14 is lower than a pressure drop across the third section 13. This results in good filter performance on the one hand achieved, but on the other hand the passage through the device 1 is not made too difficult. Furthermore, in the fourth section 14, cooling of permeable smoke is achieved.

The fourth section 14 has a support element 9 which supports the jacket 2 in the area of the fourth section 14. The support element 9 has the shape of a hollow cylinder and runs over the entire length of the fourth section 14. The bore of the hollow cylinder forms a cavity 6, which extends from the end 7 of the fourth section 14 facing the third section 13 to the end 8 facing away from the third section 13 the fourth section 14 runs.

The first fleece filter material 3 and the second fleece filter material 5 are shown with similar hatching. However, the second fleece filter material 3 has a lower density than the first fleece filter material 5. This means that a pressure drop across the first section 11 is greater than the pressure drop across the third section 13. The first fleece filter material 3 can therefore filter the smoke particularly well, whereas the second fleece filter material 5 is intended to filter primarily the activated carbon dust and as few aromatic substances as possible from the smoke should be removed.

Fig. 3 shows schematically a preferred embodiment of a smoking article 20 in a sectional view. The smoking article 20 has the device 1 for filtering smoke and a smokable substance 21 in a smoking article jacket 22. The first section 11 of the device 1 is arranged facing away from the smokable substance 21, ie away from the mouth, and the fourth section 14 of the device 1 is arranged facing away from the smokable substance 21, ie arranged close to the mouth.

Claims (14)

1. A device (1) for filtering smoke, in particular tobacco and/or cannabis cigarette filter, with a wrap (2), wherein at least a first section (11), a second section (12) and a third section (13) are provided in the wrap (2), wherein the second section (12) is disposed between the first section (11) and the third section (13), wherein

   a first nonwoven filter material (3) is provided in the first section (11);

   a porous filter material (4) is provided in the second section (12);

   and a second nonwoven filter material (5) is provided in the third section (13);

   wherein a fourth section (14) is provided in the wrap (2), wherein the third section (13) is disposed between the second section (12) and the fourth section (14), and wherein the fourth section (14) is configured in a manner such that a pressure drop over the fourth section (14) is smaller than a pressure drop over the third section (13) as a flow passes through the wrap (2),

   characterized in that

   the wrap (2) is formed by a filter wrap paper,

   wherein the fourth section (14) comprises a support element (9) that supports the wrap (2) in the region of the fourth section (14),
   wherein the porous filter material is activated carbon.
2. Device (1) according to claim 1, characterized in that the fourth section (14) comprises a cavity (6) that extends from the end (7) of the fourth section (14), the end (7) facing the third section (13), to the end (8) of the fourth section (14), the end (8) facing away from the third section (13).
3. Device (1) according to claim 1 or claim 2, characterized in that the support element (9) is in the form of a hollow cylinder.
4. Device (1) according to one of the preceding claims, characterized in that the fourth section (14) comprises a length in the longitudinal direction (11) of the device (1) of at least 2 mm.
5. Device according to claim 4, characterized in that the fourth section (14) comprises a length in the longitudinal direction (11) of the device (1) of at least 4 mm, preferably at least 6 mm.
6. Device (1) according to one of the preceding claims, characterized in that an inner wrap is provided in the wrap (2) which inner wrap extends over the first section (11), the second section (12) and the third section (13), wherein the first nonwoven filter material (3), the porous filter material (4) and the second nonwoven filter material (5) are disposed inside the inner wrap, wherein the first nonwoven filter material (3) and the second nonwoven filter material (5) are at least partially circumferentially bonded to the inner wrap.
7. Device (1) according to any one of the preceding claims, characterized in that the first section (11) and the third section (13) are configured in a manner such that a pressure drop over the first section (11) is greater than the pressure drop over the third section (13) as a flow passes through the wrap (2) .
8. Device (1) according to claim 7, characterized in that the pressure drop over the first section (11) is at least 1.2 times, preferably at least 1.5 times, particularly preferably 1.8 times the pressure drop over the third section (13).
9. Device (1) according to one of the preceding claims, characterized in that the first section (11) and the third section (13) are configured in a manner such that a pressure drop per unit length in the first section (11) is greater than a pressure drop per unit length in the third section (13) as a flow passes through the wrap (2).
10. Device (1) according to one of the preceding claims, characterized in that the first nonwoven filter material (3) comprises a greater density than the second nonwoven filter material (5).
11. Device (1) according to one of the preceding claims, characterized in that the second section (12) contains between 60 and 140 mg, preferably between 75 and 125 mg, particularly preferably between 85 and 115 mg of the porous filter material (4).
12. Device (1) according to one of the preceding claims, characterized in that the first nonwoven filter material (3) comprises cellulose acetate.
13. Device (1) according to one of the preceding claims, characterized in that the second nonwoven filter material (5) comprises cellulose acetate.
14. A smoking article (20), in particular a tobacco cigarette, cannabis cigarette or tobacco-cannabis cigarette, comprising a substance (21) that can be smoked, characterized by a device (1) as claimed in one of claims 1 to 13, wherein the first section (11) of the device (1) faces the substance (21) that can be smoked.

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