CN115515442A

CN115515442A - Filter, aerosol-generating article comprising same, and method for producing filter

Info

Publication number: CN115515442A
Application number: CN202280002709.8A
Authority: CN
Inventors: 安基真; 郑奉洙; 金钟烈
Original assignee: KT&G Corp
Current assignee: KT&G Corp
Priority date: 2021-04-23
Filing date: 2022-04-21
Publication date: 2022-12-23
Also published as: EP4098133A4; TWI828122B; EP4098133A1; JP7563666B2; JP2023528118A; KR20220146185A; WO2022225342A1; US20240196964A1; TW202300034A; TW202412650A

Abstract

Various embodiments of the present invention provide a filter for inclusion in an aerosol-generating article, comprising: a first filter stage comprising a first filter member carrying at least one or more different species of material particles; a second filter stage comprising a second filter member; and a wrapper for wrapping the first filter segment and the second filter segment, the first filter segment and the second filter segment being aligned along the length of the filter, the first filter segment and the second filter segment not being physically separated.

Description

Filter, aerosol-generating article comprising same, and method for producing filter

Technical Field

Various embodiments relate to a filter, an aerosol-generating article comprising the same, and a method of making the filter.

Background

As filters for application to cigarettes and smoking products, there is an increasing demand for composite filters comprising different kinds of substances in addition to filter materials. Existing composite filters are manufactured in the following manner: filters containing only the filter material and filters containing different kinds of substances are separately manufactured, and the manufactured two filters are joined. Such a composite filter is manufactured through a complicated manufacturing process as compared with a filter not containing different kinds of substances, and thus there are problems in that a deviation occurs in physical properties of the manufactured composite filter or the time and cost required for manufacturing are increased.

Disclosure of Invention

Problems to be solved by the invention

The problem to be solved by the various embodiments is to provide a filter and an aerosol-generating article comprising the same that reduce variations in physical properties of filters comprising different substances.

Further, a filter manufacturing method is provided, which can reduce the deviation in physical properties of filters containing different kinds of substances manufactured by a simplified process, and can reduce the time and expense required for manufacturing.

The problems to be solved by the embodiments are not limited to the above-described problems, and those not mentioned should be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

Means for solving the problems

As a means for solving the above-described problems, one embodiment provides a filter included in an aerosol-generating article, the filter including: a first filter stage comprising a first filter member carrying particles of at least one different species; a second filter stage comprising a second filter member; and wrapping paper for wrapping the first filter segment and the second filter segment; the first filter segment and the second filter segment are aligned along the length of the filter without the first filter segment and the second filter segment being physically separated.

Other embodiments provide an aerosol-generating article comprising a filter according to an embodiment.

Yet another embodiment provides a method of making a filter, comprising: a first step of conveying a filter tow in one direction; a second step of adding at least one different type of material particle of a predetermined weight to the filter tow being conveyed at a predetermined cycle to produce a filter tow to which different type of material particles are added at a predetermined length interval; a third step of wrapping the filter tow added with the different kinds of material particles at intervals of a prescribed length with wrapping paper; and a fourth step of cutting the filter tow wrapped with the wrapping paper into filters each containing particles of a different substance.

The means for solving the problems is not limited to the above, and may include all matters that can be inferred by those skilled in the art throughout the present specification.

Effects of the invention

The method of manufacturing a filter according to the embodiment can simplify the process as compared with the existing method of manufacturing a filter including particles of different kinds of substances, and accordingly can shorten the time required for manufacturing. Since the segments of the manufactured filter are not physically separated, variations that may occur in the physical characteristics of the filter such as resistance to draw, length, circumference, etc. can be reduced.

Further, unlike the conventional composite filter containing particles of different kinds of substances, since only one sheet of wrapping paper can be used for wrapping, the manufacturing cost can be reduced and the energy consumed for forming the perforations can be saved.

The effects of the embodiments are not limited to the above, and may include all effects that can be inferred from the structure described later.

Drawings

Fig. 1 is a diagram showing an example of a conventional composite filter containing particles of different kinds of substances.

Fig. 2 is a diagram for explaining an example of a conventional composite filter manufacturing process.

Figure 3 is a diagram illustrating a filter according to an embodiment.

Fig. 4 is a diagram for explaining an example of a manufacturing process of a filter according to an embodiment.

Fig. 5 is a sequence diagram of a method of manufacturing a filter according to an embodiment.

The manufacturing process for a filter according to one embodiment is shown in figure 6 a.

The manufacturing process of a filter of another embodiment is shown in figure 6 b.

Detailed description of the preferred embodiments

An embodiment provides a filter for inclusion in an aerosol-generating article, comprising: a first filter segment (segment) comprising a first filter member carrying particles of at least one or more different species; a second filter stage comprising a second filter member; the packing paper is used for packing the first filtering section and the second filtering section; the first filter segment and the second filter segment are aligned along the length of the filter such that the first filter segment and the second filter segment are not physically separated.

The different material particles may be one or more selected from the group consisting of activated carbon particles and tobacco particles.

The different species particles are activated carbon particles, and the first filter segment may contain 0.5mg/mm to 5mg/mm of the activated carbon particles based on the length direction of the filter.

The diameter of the different species particles may be 0.1mm to 0.7mm.

The length ratio of the first filter segment to the second filter segment with respect to the longitudinal direction of the filter may be 1.

The wrapper may comprise at least one more perforation.

Yet another embodiment provides a method of making a filter, comprising: a first step of conveying a filter tow (filter tow) in one direction; a second step of adding at least one different type of material particle of a predetermined weight to the filter tow being conveyed at a predetermined cycle to produce a filter tow to which different type of material particles are added at a predetermined length interval; a third step of wrapping the filter tow added with the different kinds of material particles at intervals of a prescribed length with wrapping paper; and a fourth step of cutting the filter tow wrapped with the wrapping paper into filters each containing particles of a different substance.

The different-species particles are activated carbon particles, and the prescribed weight may be 0.5mg/mm to 5mg/mm based on the length direction of the filter tow.

The diameter of the different species particles may be 0.1mm to 0.7mm.

The prescribed length interval may be 5mm to 30mm.

The second step may include: adding the predetermined weight of the at least one different type of material particles to the filter tow being conveyed at the predetermined period, and producing a filter tow to which the different type of material particles are added at the predetermined length interval; and a step of passing the filter tow added with the different kinds of material particles at the prescribed length intervals through a compressor and compressing it.

The second step may include: a step of passing the filter tow through a compressor and producing a compressed filter tow; adding the predetermined weight of at least one of the different substance particles to the compressed filter tow being conveyed at the predetermined period, and producing a filter tow to which the different substance particles are added at the predetermined length interval; and a step of dispersing the different type material particles into the filter tow by injecting a gas into the filter tow to which the different type material particles are added, the filter tow having the predetermined length interval.

The method of manufacturing a filter according to an embodiment may further include: a fifth step of forming at least one more perforation in said wrapper.

Detailed Description

Terms used in the embodiments are general terms that are currently widely used as much as possible in consideration of functions in the present invention, but they may be changed according to intentions of those skilled in the art, cases, or the emergence of new technologies. In addition, in a specific case, the applicant has arbitrarily selected some terms, but in this case, the meanings of the selected terms will be described in detail in the description part of the invention. Therefore, the terms used in the present invention should be defined based on the meanings of the terms as well as the overall contents of the present invention, and not only on the simple names of the terms.

Throughout the specification, a portion "comprising" a component means that the portion may include other components but not exclude other components unless there is a characteristic description contrary to the portion. In addition, terms such as "… … section" and "… … module" described in this specification mean a unit that processes at least one function or operation, and can be implemented in hardware or software, or a combination of hardware and software.

In addition, terms including ordinal numbers such as "first" or "second" used in the present specification may be used to describe various elements, but the elements should not be limited by the terms. The use of the terms is only intended to distinguish one element from another.

Throughout the specification, "aerosol-generating article" refers to an article for smoking. For example, the aerosol-generating article may be a conventional burning cigarette used by being lit and burning, or may also be a heated cigarette used by being heated by an aerosol-generating device.

Throughout the specification, "longitudinal direction of the filter" refers to a direction in which the length of the filter extends.

Throughout the specification, "tobacco material" refers to all forms of material including ingredients originating from tobacco leaves.

Throughout the specification, "filter member" refers to a member containing a filter material. For example, the filter member may comprise a plurality of filaments.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments. The invention is not, however, limited to the embodiments described herein, but may be embodied in various different forms.

Hereinafter, a plurality of embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a diagram showing an example of a conventional composite filter including different-type material particles, and fig. 2 is a diagram for explaining an example of a conventional composite filter manufacturing process.

Referring to fig. 11, a conventional composite filter 100 containing particles 2 of different kinds of substances includes: a first filtering section 110 comprising a filtering member carrying particles 2 of different substances; and a second filter stage 120 including only filter members. The filter member of the first filter stage 110 includes a plurality of fiber filaments, and the different kinds of material particles 2 may be randomly (randomly) dispersed and arranged among the plurality of fiber filaments.

The existing composite filter 100 containing particles 2 of different kinds of substances comprises: a first inner wrapper 131 for wrapping the first filter segment 110; and a second inner wrapper 132 for wrapping the second filter segment 120. In addition, the existing composite filter 100 containing particles 2 of different kinds of substances includes: an outer wrapper 133 for wrapping the first filter segment 110 wrapped by the first inner wrapper 131 and the second filter segment 120 wrapped by the second inner wrapper 132.

The outer wrapper 133 may be formed with at least one more perforation 140 to allow external air to flow into the filter or internal air to flow out. Perforations of the same pattern may be formed at positions of the first inner wrapper 131 or the second inner wrapper 132 corresponding to the at least one perforation 140 of the outer wrapper 133.

Referring to fig. 1 and 2, a conventional composite filter 100 including particles 2 of different kinds of substances is manufactured as follows: filters including filter elements carrying different kinds of material particles 2 and filters including only filter elements are manufactured separately and then joined. In other words, two processes for manufacturing each filter and one process for joining the two filters need to be passed, and thus three processes are required in total. Filters manufactured through a plurality of processes may have variations in physical characteristics such as inhalation resistance, length, and circumference. In addition, the time required for manufacturing may be increased.

Also, when two kinds of filters are manufactured, it is required to use one wrapping paper for each of the two kinds of filters, and one wrapping paper is additionally required in the course of joining the manufactured two kinds of filters. Thus, the number of wrappers required for manufacturing the filter is unnecessarily increased, thereby becoming a factor of increasing the manufacturing cost.

In which the perforation 140 formed in the wrapper paper may be formed by a mechanical method such as laser etching (etching), since the existing composite filter 100 including the different kinds of material particles 2 is overlapped by a multi-layered wrapper paper, it may be necessary to consume much unnecessary energy to form the perforation 140.

Fig. 3 is a diagram showing a filter according to an embodiment, and fig. 4 is a diagram for explaining an example of a manufacturing process of the filter according to the embodiment.

Referring to fig. 3, a filter 200 according to an embodiment may include: a first filtering section 210 comprising a first filtering member carrying at least more than one different species of particles 2; and a second filter stage 220 comprising a second filter member. The first filter segment 210 and the second filter segment 220 may be aligned along the length of the filter 200.

A filter 200 according to an embodiment may be included in an aerosol-generating article (not shown). The filter 200 may be included at one end of an aerosol-generating article and the generated aerosol may pass through the first filter segment 210 and the second filter segment 220 in sequence and create an airflow whereby a smoker may draw aerosol from the second filter segment 220.

The first filter stage 210 may comprise a first filter member carrying at least more than one different kind of substance particles 2. At least one kind of different material particles 2 may be randomly dispersed and disposed inside and outside the first filter stage 210.

The different-type substance particles 2 may be one or more selected from the group consisting of activated carbon particles and tobacco particles, and may preferably be activated carbon. The carbon particles included in the filter 200 can adsorb gas phase substances based on their strong adsorptivity, and thus are used together with cellulose acetate fibers mainly used for filtering particulate substances, thereby playing a complementary role.

The tobacco particles may be particles comprising tobacco material. The tobacco material can be, for example, tobacco leaves, tobacco veins, expanded tobacco, cut tobacco, reconstituted tobacco, tobacco extracts, and combinations thereof. When the filter 200 comprising the first filter segment 210 containing tobacco particles is applied to an aerosol-generating article, the high temperature aerosol passing through the filter 200 is therefore able to produce nicotine from the tobacco particles, so that the smoking sensation may be improved.

In one embodiment, where the different species of substance particles 2 are activated carbon particles, the first filter stage 210 may contain from 0.5mg/mm to 5mg/mm of activated carbon particles, based on the length of the filter. Since the first filter segment 210 contains the activated carbon particles having the weight in the numerical range as described above, the filter 200 can improve the adsorption effect of the gas-phase substances based on the activated carbon particles while having an appropriate inhalation resistance. Preferably, the first filter stage 210 may contain about 1mg/mm to 4mg/mm of activated carbon particles, more preferably about 1.5mg/mm to 5mg/mm, based on the length direction of the filter.

The diameter of the different species particles 2 may be about 0.1mm to about 0.7mm. Since the different species of material particles 2 have diameters in the range as described above, the different species of material particles 2 can be uniformly distributed throughout the first filter member, while circumferential (circumferential) deviations measured with reference to a direction perpendicular to the lengthwise direction of the first filter segment 210 can be reduced. When the diameter of the different kind of material particles 2 is less than about 0.1mm, agglomeration of the different kind of material particles 2 may occur, whereby the different kind of material particles 2 may not be uniformly distributed throughout the first filter member. In addition, when the diameter of the different kind of material particles 2 is greater than about 0.7mm, a circumferential (perimeter) deviation measured with reference to a direction perpendicular to the length direction of the first filter stage 210 may increase. Further, since the larger the diameter of the particles, the more the weight of the different kinds of substances increases, whereby they cannot be put on the filter to be dropped, so that there is a possibility that the deviation of the weight and the suction resistance of the filter increases. Preferably, the different species particles 2 may have a diameter of about 0.1mm to about 0.7mm, more preferably, may have a diameter of about 0.15mm to about 0.6 mm.

The first filter stage 210 and the second filter stage 220 may not be physically separated. Here, "not to be physically separated" means that the respective filter members included in the first filter stage 210 and the second filter stage 220 are not joined in a separated state. In other words, the first filter member and the second filter member may differ only in whether or not they contain different kinds of particles 2 of the substance, and may contain the same filter substance. For example, the first filter member of the first filter segment 210 and the second filter member of the second filter segment 220 may comprise the same plurality of fiber filaments, which may extend from one end of the filter 200 to the other. The first and second filter members may comprise cellulose acetate fibers, but are not limited thereto and may comprise various types of filter materials known in the art.

The filter 200 may include: a wrapper 230 for wrapping the first filter stage 210 and the second filter stage 220. The wrapper 230 may include at least one more perforation 240. The position at which the perforations 240 are formed may be suitably adjusted depending on the characteristics of the aerosol-generating article to which the filter 200 is applied. For example, to achieve a higher aerosol dilution ratio, the perforations 240 may be formed at a location corresponding to the first filter segment 210, but are not limited thereto.

The ratio of the lengths of the first filter segment 210 and the second filter segment 220 may be 1.

Since the first filter segment 210 and the second filter segment 220 have the length ratio of the numerical range as described above, the filter 200 can have an appropriate inhalation resistance. The first filter segment 210 and the second filter segment 220 preferably have a length ratio of 1.

The first filter segment 210 and the second filter segment 220 each have a length of about 5 to about 30mm, based on the length direction of the filter 200. Further, the lengths of the first filter stage 210 and the second filter stage 220 are about 6mm to about 18mm, respectively. For example, the length of the first filter stage 210 may be about 15mm, and the length of the second filter stage 220 may be about 12mm. As another example, the first filter stage 210 may have a length of about 12mm and the second filter stage 220 may have a length of about 15 mm.

Referring to fig. 3 and 4, a filter 200 according to an embodiment may be manufactured as follows: after the filter tow to which at least one or more different-type material particles 2 are added at predetermined length intervals is manufactured, the filter tow is cut into filters 200 containing the different-type material particles 2. Therefore, since only the process for manufacturing the filter tow to which the different species of substance particles 2 are added with a prescribed length interval and the process for cutting the filter tow are passed, the manufacturing process can be simplified and thus the time required for manufacturing can be shortened, as compared to the conventional composite filter 100 containing the different species of substance particles 2 as described above. In addition, the first filter segment 210 and the second filter segment 220 of the filter 200 according to an embodiment are not physically separated, and thus it is possible to reduce a deviation that may be generated in physical characteristics of the filter 200 such as a suction resistance, a length, a circumference, and the like.

Further, unlike the conventional composite filter including the different kinds of material granules 2, only one wrapping paper 230 can be used for wrapping, so that the manufacturing cost can be reduced and the energy consumed for forming the perforated holes 240 can be saved.

Referring to fig. 5, the filter manufacturing method may include a first step S110, a second step S120, a third step S130, and a fourth step S140.

A method of manufacturing a filter according to an embodiment is described in detail with reference to fig. 6a and 6 b.

The manufacturing process for a filter of one embodiment is shown in figure 6a and the manufacturing process for a filter of another embodiment is shown in figure 6 b.

The first step S110 is a step of conveying the filter tow 1 in one direction.

Referring to fig. 6a and 6b, in a first step S110, the filter tow 1 may be fed to a conveyor of a filter manufacturing apparatus and conveyed at a fixed speed in one direction. For example, the filter tow 1 may be a tow of cellulose acetate material (tow). However, it is not limited thereto and may include various tows known in the art.

As a specific example, the first step may be performed by providing the filter tow 1 to a conveyor from a filter tow storage tank 10 in which the filter tow 1 is stored. Wherein the conveyor may comprise at least one more roller (roller) 21, 22, 23. The

rollers

21, 22, 23 can maintain the respective fibers constituting the filter tow 1 in a fixed arrangement during conveyance by appropriately adjusting the conveyance speed of the received filter tow 1.

As shown in fig. 6a and 6b, each of the

rollers

21, 22, 23 may include a pair of

rollers

21, 22, 23 arranged perpendicular to the direction of conveyance of the filter tow 1. The pair of

rollers

21, 22, 23 rotate in opposite directions to each other, whereby the provided filter tow 1 can be conveyed in one direction.

For example, the pair of

rollers

21, 22, 23 may include:

rollers

21, 22, 23 formed of a rubber material on the surface contacting the filter tow 1; and

rollers

21, 22, 23 having a plurality of grooves formed at predetermined intervals on the surface in contact with the filter tow 1. The

rollers

21, 22, 23, the surfaces of which are formed of a rubber material, can transport the filter tow 1 by friction with the filter tow 1. The

rollers

21, 22, 23 having a plurality of grooves formed on the surface thereof at predetermined intervals can maintain the fibers in a fixed arrangement during the conveyance of the filter tow 1.

The method of manufacturing a filter according to an embodiment may further comprise the step of adding a plasticizer (plastisizer) to the filter tow 1 being conveyed. Referring to fig. 6a and 6b, the filter tow 1 conveyed by the conveying

rollers

21, 22, 23 may pass through a plasticizer feeder 30. The plasticizer feeder 30 may spray a plasticizer to the surface of the filter tow 1 under conveyance.

The plasticizer can aggregate the plurality of fibers of the filter tow 1, and since the fibers are aggregated, the particles 2 of different substances added in the subsequent step can be prevented from separating from the filter tow 1 and maintain the position thereof. The plasticizer may use one or more selected from the group consisting of triacetin (triacetin), triethyl citrate (triethyl citrate), and polyethylene glycol (polyethylene glycol), but is not limited thereto, and may include various filter materials known in the art.

The second step S120 is a step of adding at least one different type of material particle 2 of a predetermined weight to the filter tow 1 being conveyed at a predetermined cycle, and producing the filter tow 1 to which the different type of material particles 2 are added at a predetermined length interval.

The different-type material particles 2 may be one or more selected from the group consisting of activated carbon particles and tobacco particles, and preferably may be carbon particles. The carbon particles included in the filter can adsorb gas phase substances based on their strong adsorptivity, and thus are used together with cellulose acetate fibers mainly for filtering granular substances, thereby playing a complementary role.

The tobacco particles may be particles comprising tobacco material. The tobacco material can be, for example, tobacco leaves, tobacco side veins, expanded tobacco, cut tobacco, reconstituted tobacco, tobacco extracts, and combinations thereof. When a filter containing tobacco particles is applied to an aerosol-generating article, nicotine can be generated from the tobacco particles by high-temperature aerosol passing through the filter, so that the smoking feeling can be improved.

The second step S120 may be performed by adding different species of particles 2 of a prescribed weight to the filter tow 1 under conveyance at a fixed position for a prescribed period. When the different-type substance particles 2 are repeatedly added at a fixed position at a fixed period, the filter tow 1 during conveyance may be repeatedly formed with a portion containing the different-type substance particles 2 and a portion not containing the different-type substance particles 2 at a predetermined interval. The different species of substance particles 2 added may be randomly disposed between the plurality of filaments of the filter tow 1.

As a specific example, referring to fig. 6a and 6b, different kinds of substance particles 2 may be stored in different kinds of substance particle storage tanks 40, and added to the filter tow 1 under conveyance from the different kinds of substance particle storage tanks 40 by different kinds of substance particle feeders 41. The different-type material particle feeder 41 may have a gear form in which a plurality of grooves capable of accommodating different-type material particles 2 of a predetermined weight are formed at predetermined intervals. A different kind of material particle feeder 41 in the form of a gear may be provided at a lower portion of the different kind of material particle storage tank 40. The different-type-substance particle feeder 41 in the form of a gear wheel can freely drop different-type-substance particles 2 into the filter tow 1 being conveyed by rotating the different-type-substance particle feeder after the different-type-substance particles 2 of a predetermined weight are accommodated in grooves formed at regular intervals.

Wherein the prescribed period may refer to a time interval between time points at which the addition of the different species of substance particles 2 is started. The prescribed period can be adjusted by the intervals of the plurality of grooves formed in the different-kind-substance particle feeder 41 in the form of gears and the rotation speed of the different-kind-substance particle feeder 41. For example, the predetermined cycle may be increased as the intervals between the plurality of grooves formed in the different type material particle feeder 41 of the gear type are increased. Further, the predetermined period may be reduced as the rotation speed of the different-kind-substance particle feeder 41 increases.

The prescribed weight may refer to the weight of the different species of particles 2 added in one process for adding the different species of particles 2. For example, the prescribed weight may refer to the weight of the different kind of substance particles 2 accommodated in the grooves of the different kind of substance particle feeder 41 in the form of gears.

In one embodiment, the different species of material particles 2 are activated carbon particles and the specified weight may be about 0.5mg/mm to 5mg/mm based on the length of the filter tow. The longitudinal direction of the filter tow may be the direction in which the length of the filter tow extends. When the prescribed weight amount is in the numerical range as described above, the filter produced can have an appropriate inhalation resistance while being capable of improving the adsorption effect of the gas phase substances based on the activated carbon particles. Preferably, the stated weight may be from about 1mg/mm to 4mg/mm, more preferably from about 1.5mg/mm to 5mg/mm, based on the length of the filter tow.

The particles 2 of different substances may have a diameter of about 0.1 to about 0.7mm. When the different-species substance particles 2 have diameters in the range as described above, the different-species substance particles 2 can be uniformly distributed in the filter tow 1 while the circumferential (circumferential) deviation measured with reference to the direction perpendicular to the longitudinal direction of the filter to be manufactured can be reduced. When the diameter of the heterogeneous material particles 2 is less than about 0.1mm, agglomeration of the heterogeneous material particles 2 occurs, and thus the heterogeneous material particles 2 are not uniformly distributed in the filter tow 1. Further, when the diameter of the different-species substance particle 2 is larger than about 0.7mm, the circumferential (circumferential) deviation measured with respect to the direction perpendicular to the longitudinal direction of the manufactured filter is increased. Further, since the larger the diameter of the particles, the more the weight of the different substances increases, and thus they cannot be placed on the filter to be dropped, there is a possibility that the deviation of the weight and suction resistance of the filter increases. Preferably, the different species particles 2 may have a diameter of about 0.1mm to about 0.7mm, more preferably, may have a diameter of about 0.15mm to about 0.6 mm.

Here, the prescribed length interval may refer to a distance between portions not containing different species of substance particles 2 (i.e., a length of the portions not containing different species of substance particles 2). The prescribed length intervals may be varied by adjusting the conveying speed and the free fall distance of the filter tow 1. For example, as the conveying speed of the filter tow 1 increases, the length of the sections containing the different kinds of substance particles 2 may increase, and the distance between the sections containing the different kinds of substance particles 2 may also increase. Further, as the free fall distance increases, the length of the portion containing the different species of substance particles 2 may increase, and the distance between the portions containing the different species of substance particles 2 may decrease.

For example, the prescribed length interval may be about 5mm to about 30mm. In other words, the length of the portion not containing the different species of substance particles 2 may be about 5mm to about 30mm. Wherein the length of the portion containing the particles 2 of the different substances may be from about 5mm to about 30mm.

The portion containing the different species of particles 2 and the portion not containing the different species of particles 2 may have a length ratio of 1. When the length ratio is in the numerical range as described above, the filter produced can have an appropriate inhalation resistance. Preferably, there may be a length ratio of 1.

The second step S120 may include: a step of adding at least one kind of different substance particle 2 of a predetermined weight to the filter tow 1 being conveyed at a predetermined cycle, and producing a filter tow 1 to which the different substance particles 2 are added at predetermined length intervals; and a step of passing the filter tow 1 to which the different type substance particles 2 are added at predetermined length intervals through a compressor 50 and compressing the same.

Referring to figure 6a, a filter tow 1 with added granules 2 of different kinds of substances may be passed through a compressor 50. The compressor 50 can make the density of the filter tow 1 to which the different kinds of material particles 2 are added more uniform by compressing the fed filter tow, and in the subsequent third step S130 of wrapping the filter tow 1 with a wrapping paper, can prevent the problem that the wrapping paper is broken due to the pressure transmitted from the thick thickness of the filter tow 1. The compressor 50 may use a compression jet (jet), but is not limited thereto, and various compression devices known in the art may be employed.

Further, referring to fig. 6b, the second step S120 may include: a step of producing a compressed filter tow 1 by passing the filter tow 1 through a compressor 50; a step of adding at least one kind of different substance particle 2 of a predetermined weight to the filter tow 1 being conveyed at a predetermined cycle, and producing a filter tow 1 to which the different substance particles 2 are added at predetermined length intervals; and a step of dispersing the different species of substance particles 2 into the filter tow 1 by jetting gas to the filter tow 1 to which the different species of substance particles 2 are added at intervals of a prescribed length.

When the filter tow 1 is compressed before the addition of the different substance granules 2, the compressed filter tow 1 may have a higher density, and thus the different substance granules 2 may not be added to the inside of the tow. Accordingly, it may include: a step of dispersing the different species of substance particles 2 into the filter tow 1 by jetting gas to the filter tow 1 to which the different species of substance particles 2 are added.

The step of dispersing the different species of substance particles 2 into the filter tow 1 by injecting gas may be performed by a gas injector 80 including air jet (air jet) or the like, but is not limited thereto, and various gas devices known in the art may be employed.

The third step S130 is a step of wrapping the filter tow 1 to which the different type substance particles 2 are added at intervals of a predetermined length with a wrapping paper.

Referring to fig. 6a and 6b, filter tow 1 with different species of material particles 2 added thereto at regular length intervals may be fed to a packer 60. The wrapping machine 60 may wrap the exterior of the filter tow 1 with a wrapper. The wrapping machine 60 may wrap the filter tow 1 with a wrapping paper so that it has a cylindrical shape, and may fix the wrapping paper with an adhesive. For example, the filter tow 1 may be wrapped with a portion of wrapping paper coated with hot-melt (hot-melt) adhesive, and then the wrapping paper may be fixed by heating, but not limited thereto, and various adhesives known in the art may be used.

The fourth step S140 is a step of cutting the filter tow 1 wrapped with the wrapping paper into filters each containing different kinds of material particles 2.

Referring to fig. 6a and 6b, the wrapped filter tow 1 may be fed to a cutter 70. The cutter 70 may cut the filter tow 1 wrapped with the wrapping paper into a prescribed length, whereby a filter can be manufactured. The cutter 70 may cut the filter into different types of material particles 2 each contained in the filter. For example, as described with respect to fig. 2 and 3, the filter tow 1 may be cut such that the filter tow 1 comprises: a first filtration stage 210 provided with a first filtration member on which at least one kind or more of different-type substance particles 2 are carried; and a second filter stage 220 provided with a second filter member.

The method of manufacturing a filter according to an embodiment may further include: a fifth step of forming at least one more perforation in the wrapper. For example, the formation of the through-holes may be performed using laser etching, but is not limited thereto, and various methods known in the art may be employed. As described above, according to the filter manufacturing method of an embodiment, the filter can be manufactured using only one wrapping paper without overlapping wrapping using a plurality of wrapping papers, and therefore, energy consumed to form perforations can be saved.

Those skilled in the art to which the embodiment relates will appreciate that variations may be made without departing from the essential characteristics of the described contents. Accordingly, the disclosed methods are not to be considered limiting, but rather illustrative. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent to the claims should be construed as being included in the present invention.

Claims

1. A filter for inclusion in an aerosol-generating article, comprising:

a first filter stage comprising a first filter member carrying at least one or more different species of material particles,

a second filter stage comprising a second filter member, an

Wrapping paper for wrapping the first filter segment and the second filter segment;

the first filter segment and the second filter segment are aligned along the length of the filter,

the first filter stage and the second filter stage are not physically separated.

2. A filter according to claim 1,

the different material particles are one or more material particles selected from the group consisting of activated carbon particles and tobacco particles.

3. A filter according to claim 1,

the different species of particles are activated carbon particles,

the first filter segment contains 0.5mg/mm to 5mg/mm of the activated carbon particles, based on the length direction of the filter.

4. A filter according to claim 1,

the different species particles have a diameter of 0.1mm to 0.7mm.

5. A filter according to claim 1,

the length ratio of the first filter segment to the second filter segment is 1.5 to 1.5 based on the length direction of the filter.

6. A filter according to claim 1,

the wrapper comprises at least one more perforation.

7. An aerosol-generating article comprising a filter according to claim 1.

8. A method of making a filter, comprising:

a first step of conveying the filter tow in one direction;

a second step of adding at least one different type of material particle of a predetermined weight to the filter tow being conveyed at a predetermined cycle to produce a filter tow to which the different type of material particle is added at a predetermined length interval;

a third step of wrapping the filter tow to which the different type material particles are added at intervals of a predetermined length with a wrapping paper; and

a fourth step of cutting the filter tow wrapped with the wrapping paper into filters respectively containing the different kinds of particles of the substances.

9. The method of manufacturing a filter according to claim 8,

the different kinds of substance particles are one or more substance particles selected from the group consisting of activated carbon particles and tobacco particles.

10. The method of manufacturing a filter according to claim 8,

the different species of particles are activated carbon particles,

the predetermined weight is 0.5mg/mm to 5mg/mm based on the longitudinal direction of the filter tow.

11. The method of manufacturing a filter according to claim 8,

the different species particles have a diameter of 0.1mm to 0.7mm.

12. The method of manufacturing a filter according to claim 8,

the prescribed length interval is 5mm to 30mm.

13. The method of manufacturing a filter according to claim 8,

the second step includes:

a step of producing a filter tow to which the different type substance particles are added at the predetermined length intervals by adding the predetermined weight of at least one or more different type substance particles to the filter tow being conveyed at the predetermined period; and

and a step of compressing the filter tow to which the different type material particles are added at the predetermined length intervals by passing the filter tow through a compressor.

14. The method of manufacturing a filter according to claim 8,

the second step includes:

a step of producing a compressed filter tow by passing the filter tow through a compressor;

producing a filter tow to which the different material particles are added at the predetermined length intervals by adding the predetermined weight of at least one or more of the different material particles to the compressed filter tow being conveyed at the predetermined period; and

a step of dispersing the different type material particles into the filter tow by jetting gas to the filter tow to which the different type material particles are added, the filter tow having the prescribed length interval.

15. The method of manufacturing a filter according to claim 8, further comprising:

a fifth step of forming at least one more perforation in said wrapper.