WO2023095209A1

WO2023095209A1 - Tow band for heated cigarette filter, and tow band packaging article for heated cigarette filter

Info

Publication number: WO2023095209A1
Application number: PCT/JP2021/043005
Authority: WO
Inventors: 知治宮下
Original assignee: 株式会社ダイセル
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2023-06-01

Abstract

This tow band for a heated cigarette filter comprises: a crimped cellulose acetate fiber; and a plasticizer that plasticizes the cellulose acetate fiber, wherein the content of the plasticizer falls within the range of 8 mass% to 12 mass%.

Description

Heated cigarette filter tow band and heatable cigarette filter tow band packing article

The present disclosure relates to a heated cigarette filter toe band and a heated cigarette filter toe band packing article.

This document uses each of the defined terms below.
TD: Total denier, refers to the fiber density (grams per 9000m) of a tow band or a bundle of multiple filaments.

FD: Single fiber density (filament denier), which refers to the fiber density of a single fiber (grams per 9000m). Also called monofilament denier.

Filament: Refers to a continuous long fiber. In particular, it refers to single fibers extruded from the spinning holes of a spinneret.

Spinning hole: formed in the spinneret of the spinning tube, and discharges (spinning) the filament.

Tow band: Yarn, which is an aggregate of filaments (single fibers) discharged from each spinneret of a plurality of spinning tubes, is united. A plurality of yarns are united and the TD is set to a predetermined number to form an end. This end is crimped. This crimped end (aggregate of filaments) is called a toe band. That is, the toe band has a TD and a number of crimps. The toe band is packed in bales.

Filter (tip): Passes the aerosol generated by an aerosol-generating article containing tobacco components when smoking a heated cigarette. The filter is constructed, for example, by winding a wrapping paper around the outer periphery of a molded body obtained by molding a predetermined filter material into a cylindrical shape.

Water Vapor Permeability: Refers to the mass (5 g/m ² ^/ day) of the amount of water vapor in grams per square meter of area that permeates an object (eg, sheet or film) in 24 hours. Water vapor permeability is defined in item 3.1 of JIS K 7129-1:2019. The measurement conditions for water vapor permeability in this document are set at a temperature of 40° C. and a humidity of 90% RH.

Heat-not-burn cigarettes are known in which aerosol obtained by heating an aerosol-generating article is used for smoking. Aerosol-generating articles employ, for example, heated cigarette filters made from a toe band containing crimped fibers. The fibers include, for example, crimped cellulose acetate fibers as disclosed in US Pat.

It is desirable that the aerosol of the aerosol-generating article is not excessively filtered in order to obtain a good palatability. For this reason, heated cigarette filters use, for example, a tow band containing cellulose acetate fibers having a relatively large FD compared to ordinary cigarette filters. This creates abundant fiber interstices within the heated cigarette filter for aerosol flow. The tow band is used, for example, in the manufacture of heated cigarette filters after being formed into a bale and compression packed.

Japanese Patent Publication No. 2008-504453 JP-A-5-179528

The toe band generates stress by being compressed during packing. Due to this stress, the cellulose acetate fibers with large FD in the tow band crack. The result is fly, which is fiber fragments and fluff. Fly contaminates the filter and degrades the quality of the filter. The problem of fly due to compression of the toe band is noticeable in, for example, a toe band containing cellulose acetate fibers with a relatively large FD used in heated cigarette filters.

Therefore, the present disclosure is directed to the production of a heated cigarette filter using a tow band containing crimped cellulose acetate fibers, and even if the FD of the fibers is relatively large, the toe band is compressed during packaging. The purpose is to prevent deterioration in quality of heated cigarette filters due to frying.

According to studies by the inventors of the present application, a tow band containing crimped cellulose acetate fibers contains an appropriate amount of plasticizer with a value in the range of 8% by mass or more and 12% by mass or less when compressed and packed. In this case, it was confirmed that the amount of fly generated by compression can be reduced. The present disclosure is based on such findings.

That is, the tow band for a heated cigarette filter according to one aspect of the present disclosure includes crimped cellulose acetate fibers and a plasticizer that plasticizes the cellulose acetate fibers, and the content of the plasticizer is 8 mass. % or more and 12 mass % or less.

According to the above configuration, the toe band contains an appropriate amount of plasticizer whose content is in the range of 8% by mass or more and 12% by mass or less, so that the cellulose acetate fibers contained in the toe band are plasticized and hardly damaged. Become. Therefore, for example, even if stress is generated in the toe band compressed during packing, the cellulose acetate fibers in the toe band are less likely to be damaged. As a result, even when the FD of the cellulose acetate fiber is relatively large, it is possible to reduce the occurrence of fly due to compression of the toe band during packing. As a result, deterioration in quality of the heated cigarette filter due to frying can be prevented.

Water may be included as the plasticizer, and the water content may be in the range of 8% by mass or more and 12% by mass or less. By using such a content of water as a plasticizer, the toe band can be appropriately plasticized. As a result, it is possible to better prevent the toe band from being damaged due to compression and causing fly.

The plasticizer may contain at least one of a glycerin ester plasticizer, a citrate ester plasticizer, an adipic acid plasticizer, a phthalate plasticizer, acetone, and diethylene glycol. This allows for increased plasticizer options. As a result, the degree of freedom in designing the toe band can be improved.

The FD of the cellulose acetate fiber may be in the range of 10 or more and 30 or less. As a result, the FD of the cellulose acetate fibers can be set to a relatively large value, and plenty of inter-fiber spaces can be secured in the toe band. Therefore, in a heated cigarette filter manufactured using this toe band, it is possible to appropriately prevent aerosol from being excessively filtered during smoking. Therefore, it is possible to prevent deterioration of the quality of the filter due to the fly caused by the compression of the toe band during packing, and to manufacture a heat-not-burn cigarette filter with excellent smoking taste.

The degree of substitution of the cellulose acetate fiber may be in the range of 2.0 or more and 2.7 or less.

In addition, a tow band packing article for a heated cigarette filter according to another aspect of the present disclosure includes any of the above toe bands formed in a sheet shape, and a packaging material arranged to wrap at least part of the toe band. and, the water vapor permeability of the packaging material is a value in the range of 5 g/m ² /day or less.

According to the above configuration, at least part of the toe band is wrapped with a wrapping material having a water vapor permeability set to a value within the above range. As a result, it is possible to suppress the water content of the toe band from decreasing over time. Therefore, the effect of plasticizing the cellulose acetate fibers in the toe band by the moisture contained in the toe band can be stably maintained. Therefore, for example, even when the toe band wrapped with the wrapping material is compressed and packed, it is possible to prevent the toe band from flying over a long period of time. As a result, the tow band can be used to manufacture heated cigarette filters with consistent quality.

The wrapping material may be disposed so as to wrap the entire outer surface of the toe band, and the water vapor transmission rate of the wrapping material may be in the range of 2 g/m ² /day or less. According to the toe band packing article having such a configuration, the water content of the toe band can be stably maintained. Therefore, it is possible to prevent fly from occurring due to compression of the toe band during packing for a longer period of time.

According to aspects of the present disclosure, when a heated cigarette filter is manufactured using a tow band comprising crimped cellulose acetate fibers, the tow band is compressed during packaging even when the FD of the fibers is relatively large. As a result, it is possible to prevent deterioration in the quality of the heated cigarette filter due to the fly that occurs.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the cellulose acetate tow band manufacturing apparatus which concerns on embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a cellulose acetate tow band packing article for a heated cigarette filter according to an embodiment; Fig. 10 is a diagram showing a cellulose acetate tow band packing article for a heated cigarette filter according to a modification of the embodiment; BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a heated cigarette filter manufacturing apparatus according to an embodiment; 1 is a cross-sectional view of a heat-not-burn cigarette according to an embodiment; FIG. 4 is a graph showing the relationship between the number of days after manufacture of CA tow bands and the amount of fly generated.

Embodiments will be described with reference to the drawings. As used herein, "smoking" refers to smoking heat-not-burn tobacco unless otherwise specified. That is, it refers to heating and smoking an aerosol-generating article containing a tobacco component without igniting it. In addition, "mass %" described in this document refers to "weight percentage (wt%)", not "mass percentage".
[Cellulose acetate tow band manufacturing equipment]
FIG. 1 is a schematic diagram of a cellulose acetate (hereinafter also referred to as CA) tow band manufacturing apparatus 1 according to an embodiment. The CA tow band manufacturing apparatus 1 continuously spins CA fibers 61, which are long fibers, by a dry spinning method. The CA tow band manufacturing apparatus 1 also manufactures a CA tow band 64 using CA fibers 61 . CA toe band 64 is a toe band for a heated cigarette filter. The CA tow band 64 of the present embodiment includes crimped CA fibers 61 and a plasticizer that plasticizes the CA fibers 61, as will be described later in detail. The CA tow band 64 has a value in the range of 8 mass % or more and 12 mass % or less of the plasticizer content. Accordingly, the CA tow band 64 is configured to be less likely to be damaged even if it is compressed during packaging. Therefore, fly is prevented both when the CA tow band 64 is compressed and packed, and when the packed CA tow band 64 is unwound to manufacture a heated cigarette filter. The CA tow band manufacturing apparatus 1 includes a mixer M, a filter F, a spinning unit 2, a fixing roll R0, a godet roll GR, a crimping device 3, and a drying device 4.

The CA tow band manufacturing apparatus 1 uses a spinning dope 60 containing CA such as cellulose diacetate and a solvent. In the spinning dope 60 of the present embodiment, CA flakes are dissolved in an organic solvent and water. Further, the spinning dope 60 of the present embodiment contains a plasticizer that plasticizes the CA fibers 61 . In this embodiment, water also serves as a plasticizer. As another example, the spinning stock solution 60 has a titanium oxide content set to a value in the range of 0% by mass or more and 0.01% by mass or less. That is, the spinning stock solution 60 does not substantially contain titanium oxide.

The spinning stock solution 60 is filtered by the filter F after passing through the mixer M. The spinning stock solution 60 that has passed through the filter F is supplied to the spinneret 11 arranged on the spinning tube 12 of the spinning unit 2 . The spinning dope 60 is discharged from a plurality of spinning holes 11 a of the spinneret 11 . The peripheral shape of the spinning hole 11a is triangular as an example, but may be a shape other than triangular such as a circle. The shape and opening size of the spinning holes 11a are appropriately set according to the specifications of the CA fibers 61 to be spun.

The spinning dope 60 discharged from the spinning holes 11a comes into contact with the hot air supplied from the outside into the spinning tube 12. The spinning dope 60 dries as the solvent partially evaporates. Thereby, a solid CA fiber 61 is formed. A plurality of CA fibers 61 passing through each spinning tube 12 are bundled to form a yarn 62 . The yarn 62 is impregnated with a textile oil or the like by the impregnation roll R0, and then wound up by the godet roll GR. The yarn 62 is then wound up by a predetermined winding device. A plurality of yarns 62 are accumulated or laminated. As a result, an end (tow) 63, which is a flat assembly of yarns 62, is formed. End 63 has a predetermined TD. The end 63 is conveyed to the crimping device 3 .

The crimping device 3 has a pair of nip rolls R1 and R2 and a stuffing box 13. The end 63 is pushed into the stuffing box 13 after a nip pressure is applied by a pair of nip rolls R1 and R2. Thereby, a plurality of CA fibers 61 in the end 63 are crimped to produce a CA tow band 64 .

The CA toe band 64 is dried by the drying device 4. By adjusting the degree of drying of the CA tow band 64 by the drying device 4, the water content of the CA tow band 64 is adjusted. The CA tow band 64 that has passed through the drying device 4 is accumulated and passes through the nip point between the transport rolls R3 and R4. After that, the CA tow band 64 is introduced into the packing container 14 in a bale-like state by the compression device 15 while being guided by the guide G2. The CA tow band 64 is compressed within the packaging container 14 to form a CA tow band deposit 65 . As an example, the CA tow band deposit 65 is compressed in one direction (here, in the vertical direction) while the veil-shaped CA tow band 64 is horizontally folded multiple times. Also, as will be described later, the CA tow band deposit 65 is used to produce the CA tow band packaged goods (bales) 20 .

FD and TD of the CA toe band 64 can be set as appropriate. Since the CA toe band 64 of this embodiment is used for a heated cigarette filter, the FD is set to a relatively large value so that the aerosol of the aerosol-generating article can easily pass through. As an example, the FD of the CA toe band 64 is a value in the range of 10 or more and 30 or less. As another example, the FD of the CA toe band 64 preferably has a value in the range of 12 or more and 30 or less, and more preferably has a value in the range of 12 or more and 20 or less.

Also, in the CA tow band 64, as an example, the substitution degree (acetyl substitution degree) of the CA fiber 61 is a value in the range of 2.0 or more and 2.7 or less. As an example, the lower limit of the substitution degree of the CA fiber 61 is preferably 2.1, more preferably 2.3. By setting the degree of substitution of the CA fiber 61 within this numerical range, the solubility of CA in a solvent such as acetone used when spinning the CA tow band 64 and spinning the fiber for a cigarette filter can be improved. Therefore, excellent spinnability of the CA fiber 61 is obtained. Moreover, this solubility can be favorably maintained by setting the upper limit of the degree of substitution of the CA fiber 61 to 2.7. Moreover, by setting the substitution degree of the CA fiber 61 to 2.0 or more, for example, the CA tow band 64 can be imparted with good biodegradability. In addition, by setting the degree of substitution of the CA fiber 61 to 2.3 or more, when a heat-not-burn cigarette filter is manufactured using the CA tow band 64, the burning-type smoking article ignites and smokes the taste of the heat-not-burn cigarette. It is possible to get close to the comfort of sucking a cigarette. Therefore, a good smoking taste of the heat-not-burn tobacco can be obtained.

The degree of substitution of the CA fiber 61 can be calculated, for example, according to the method for measuring the degree of acetylation in ASTM: D-817-91 (test method for cellulose acetate, etc.). The content of titanium oxide in the CA tow band 64 of the present embodiment is set to a value in the range of 0% by mass or more and 0.01% by mass or less by using the above-mentioned spinning dope 60 . That is, the CA tow band 64 does not substantially contain titanium oxide. The content of titanium oxide in the CA tow band 64 may be zero.

Here, the CA tow band 64 includes crimped CA fibers 61 and a plasticizer whose content is in the range of 8 mass % or more and 12 mass % or less and plasticizes the CA fibers 61 . The CA tow band 64 of this embodiment contains water as a plasticizer. As an example, the CA tow band 64 has a water content of 8% by mass or more and 12% by mass or less.

The water content of the CA tow band 64 in this document refers to a value obtained by quickly weighing a sample of the CA tow band 64 having a predetermined weight (100 g) and averaging the values calculated by the following formula 1 for four samples. . The atmospheric environment of the place where the weighing machine and the dryer are arranged is, for example, a temperature of 20° C.±2° C. and a relative humidity of 65%±5%, and the CA tow band 64 is conditioned under these temperature and relative humidity environments. not a thing
[Formula 1]
Water content Sw (% by mass) of CA tow band = 100 x (M0-M1)/M1

However, M0 indicates a numerical value obtained by weighing the mass (100 g) of the sampled CA tow band 64 . Moreover, M1 refers to the mass (absolute dry mass) when the sampled CA tow band 64 is dried in an atmosphere of 105° C. for 2 hours.

The CA tow band 64 may contain a plasticizer other than water. In this case, a known plasticizer can be used. As a plasticizer other than water, the CA tow band 64 includes at least one of, for example, a glycerin ester plasticizer, a citrate ester plasticizer, an adipic acid plasticizer, a phthalate plasticizer, acetone, and diethylene glycol. .

Glycerin ester-based plasticizers include lower fatty acid esters of glycerin, in other words, ester compounds of glycerin and fatty acids having 2 to 4 carbon atoms. A 2-carbon fatty acid is acetic acid. A 3-carbon fatty acid is propionic acid. A four-carbon fatty acid is butyric acid. Glycerin ester plasticizers may have two or three of the three hydroxyl groups of glycerin esterified with the same fatty acid. Further, in the glycerin ester plasticizer, all three hydroxyl groups of glycerin may be esterified with different fatty acids. Glycerin ester plasticizers are non-toxic and readily biodegradable. Therefore, the load on the environment is small.

When the above fatty acid is acetic acid, examples of glycerin ester-based plasticizers in which three hydroxyl groups of glycerin are esterified with acetic acid include triacetin and the like. Further, when the above fatty acid is acetic acid, diacetin and the like can be mentioned as a glycerin ester-based plasticizer in which two hydroxyl groups are esterified with acetic acid. Among the above glycerin ester-based plasticizers, triacetin (glycerol trisacetate) obtained by esterifying (in other words, acetylating) all three hydroxyl groups of glycerin with acetic acid is particularly preferable. Triacetin is a component recognized as safe for human consumption. In addition, triacetin is easily biodegradable and therefore has a low environmental impact. Moreover, the CA fiber 61 obtained by adding triacetin has improved biodegradability compared to the case where triacetin is not added. In addition, triacetin is less likely to impair the taste of tobacco.

Triacetin should be of high purity, but it does not have to be strictly of high purity. Moreover, the content of triacetin in the glycerin ester plasticizer may be, for example, 80% by mass or more or 90% by mass or more in the glycerin ester plasticizer. Further, for example, at least one of monoacetin and diacetin may be included as the remainder of the glycerin ester plasticizer.

A citric acid ester-based plasticizer is obtained by condensing citric acid and alcohol. Such alcohols may be monohydric alcohols or polyhydric alcohols having a valence of 2 or higher. Citric acid ester plasticizers include, for example, citric acid esters such as acetyltriethyl citrate, acetyltributyl citrate, isodecyl citrate, isopropyl citrate, triethyl citrate, triethylhexyl citrate, and tributyl citrate. .

Examples of adipic acid-based plasticizers include dimethyl adipate, dibutyl adipate, diisostearyl adipate, diisodecyl adipate, diisononyl adipate, diisobutyl adipate, diisopropyl adipate, diethylhexyl adipate, dioctyl adipate, and adipic acid. Adipate esters such as dioctyldodecyl, dicapryl adipate, and dihexyldecyl adipate are included.

Examples of phthalate plasticizers include phthalates such as ethyl phthalate, methyl phthalate, diaryl phthalate, diethyl phthalate, diethylhexyl phthalate, dioctyl phthalate, dibutyl phthalate, and dimethyl phthalate. be done.

Here, the CA tow band 64 contains a plasticizer whose content is in the range of 8 mass % or more and 12 mass % or less, but the plurality of CA fibers 61 in the CA tow band 64 are dissolved and integrated. do not have. In other words, the multiple CA fibers 61 in the CA tow band 64 are not bonded together.

As described above, the CA fibers 61 contained in the CA tow band 64 are plasticized by the CA tow band 64 containing an appropriate amount of plasticizer whose content is in the range of 8% by mass or more and 12% by mass or less. less likely to be damaged. Therefore, for example, even if stress is generated in the CA tow band 64 that has been compressed during packaging, the CA fibers 61 in the CA tow band 64 are less likely to be damaged. As a result, even when the FD of the CA fiber 61 is relatively large, it is possible to reduce the occurrence of fly due to compression of the CA tow band 64 during packing. As a result, deterioration in quality of the heated cigarette filter due to frying can be prevented.

Also, the CA tow band 64 of the present embodiment contains water as the plasticizer, and the water content is in the range of 8% by mass or more and 12% by mass or less. By using such a content of water as a plasticizer, the CA tow band 64 can be appropriately plasticized. As a result, it is possible to more effectively prevent the CA toe band 64 from being damaged by compression and causing fly.

In addition, the plasticizer contained in the CA tow band 64 of the present embodiment includes at least one of a glycerin ester plasticizer, a citric ester plasticizer, an adipic acid plasticizer, a phthalic acid plasticizer, acetone, and diethylene glycol. include. This allows for increased plasticizer options. As a result, the degree of freedom in designing the CA toe band 64 can be improved.

[CA tow band packing goods]
FIG. 2 is a diagram showing a CA tow band packing article for a heated cigarette filter (hereinafter referred to as a "veil") 20 according to the embodiment. As shown in FIG. 2, the bale 20 includes a CA tow band stack 65 (a sheet-shaped CA tow band 64) and wrapping materials 22 and 23 (upper wrapping material 22 and lower wrapping material 22) for wrapping the CA tow band stack 65. the wrapping material 23), the paperboard material 21 disposed over the outer surfaces (e.g., the bottom, top, and side surfaces) of the CA tow band stack 65 via the

wrapping materials

22, 23, and the paperboard material 21. A binding band B is provided for binding the CA tow band deposit 65, the

packaging materials

22 and 23, and the paperboard material 21 integrally from the outside. The

packaging materials

22 and 23 are also called interior materials.

As an example, the CA tow band deposit 65 is formed in a rectangular parallelepiped shape. The CA tow band deposit 65 has a mass of, for example, several hundred kg (500 kg as an example) to about 1 ton (1000 kg). The

packaging materials

22 and 23 are resin sheets, such as LDPE (low density polyethylene), as an example. The

packaging materials

22 and 23 may be composite sheets in which two strips made of resin such as PE (polyethylene) are crossed and attached to a resin sheet such as OPP (biaxially oriented polypropylene). The wrapper may also consist of three or more separate sheets. In this case, two sheets that individually cover the lower surface and the upper surface of the CA tow band deposit 65 and one sheet that mainly covers a total of four side surfaces of the CA tow band deposit 65 can be used. When a plurality of heat-sealable sheets are used for the wrapping material, for example, after covering the entire surface of the CA tow band deposit 65 with the wrapping material, the overlapping portions of the sheets may be heat-sealed.

In the veil 20, the water vapor permeability of the

packaging materials

22 and 23 is set to a value within the range of 5 g/m ² /day or less. Thereby, in the bale 20, the amount of moisture contained in the CA tow band 64 is maintained for a long period of time. As an example, in the bail 20 of this embodiment, strictly speaking, overlapping portions of the sheets of the

packaging materials

22 and 23 are not sealed.

The ratio X1/X2 (kg/m ² ) of the mass (weight) X1 (Kg) of the bale 20 to the surface area X2 (m ² ) is a value in the range of 60 or more and 110 or less, for example. As an example, the ratio X1/X2 preferably has a value in the range of 64 to 100, more preferably 70 to 95, even more preferably 80 to 95, and 85 to 95. is most preferred. The ratio X1/X2 can be set by adjusting the packing density of the bale 20 . For example, by setting the ratio X1/X2 to a value of 60 or more, the surface area X2 can be suppressed with respect to the mass X1 of the bail 20 . Thereby, even if the storage period of the bale 20 has passed, the content of the plasticizer in the bale 20 can be easily maintained over time. Further, for example, by setting the ratio X1/X2 to a value of 110 or less, troubles such as breakage of the CA tow band 64 when the CA tow band 64 is let out from the bail 20 can be reduced.

As another example, the optimal mode of the bale 20 is to set the ratio X1/X2 to a value in the range of 64 or more and 95 or less (more preferably a value in the range of 64 or more and 87 or less), No. 23 is a combination that sets the water vapor permeability of No. 23 to a value in the range of 2 g/m ² /day or less. In the bale 20 of this embodiment, the plasticizer content of the CA tow band 64 is higher than that of a normal bale. Therefore, it is preferable to consider the ratio X1/X2 of the bail 20 .

According to the above configuration, at least a portion of the CA tow band 64 is wrapped with the wrapping

materials

22, 23 whose water vapor permeability is set within the above range. As a result, it is possible to suppress the water content of the CA tow band 64 from decreasing over time. Therefore, the effect of plasticizing the CA fibers 61 in the CA tow band 64 by the moisture contained in the CA tow band 64 can be stably maintained. Therefore, for example, even when the CA tow band 64 wrapped with the wrapping

materials

22 and 23 is compressed and packed, it is possible to prevent the CA tow band 64 from flying over a long period of time. As a result, this CA tow band 64 can be used to manufacture heated cigarette filters with stable quality.

FIG. 3 is a diagram showing a heated cigarette filter bail 25 according to a modification of the embodiment. The bale 25 is covered with the wrapping material 26 over the entire surface of the CA tow band deposit 65 . CA tow band stack 65 is internally sealed by wrapper 26 . In bail 25 , wrapping material 26 is arranged to wrap the entire outer surface of CA tow band 64 . The water vapor permeability of the packaging material 26 is a value in the range of 2 g/m ² /day or less. According to the bail 25 having such a configuration, the water content of the CA tow band 64 can be stably maintained. Therefore, it is possible to prevent fly from occurring due to compression of the CA tow band 64 during packing for a longer period of time.

[Filter manufacturing equipment]
FIG. 4 is a schematic diagram of a heated cigarette filter (chip) manufacturing apparatus 5 according to an embodiment. As shown in FIG. 4, the filter manufacturing device 5 includes a first fiber-spreading unit BJ1, a guide G4, a second fiber-spreading unit BJ2, pretension rolls R5 and R6, first fiber-spreading rolls R7 and R8, and a second fiber-spreading unit. Rolls R9 and R10, a third fiber opening unit BJ3, a plasticizer impregnation device 51, transport rolls R11 and R12, a transport jet 52, a winder 53, and a cutting device 56 are provided.

In the filter manufacturing apparatus 5, the CA tow band 64 raised from the CA tow band deposit 65 after the bale 20 is opened is guided by the guide G3. After that, the CA tow band 64 is opened in the width direction by gas in the first opening unit BJ1. After that, the CA tow band 64 is guided by the guide G4 and conveyed to the second opening unit BJ2. The CA tow band 64 is further spread in the width direction by gas in the second spreading unit BJ2. After that, the CA tow band 64 is sequentially inserted between the pretension rolls R5 and R6, between the first fiber-spreading rolls R7 and R8, and between the second fiber-spreading rolls R9 and R10. Thereby, the CA tow band 64 is opened in the conveying direction.

The CA tow band 64 that has passed between the second opening rolls R9 and R10 is further opened in the width direction by gas in the third opening unit BJ3. The CA tow band 64 is then impregnated with a plasticizer for forming the filter by a plasticizer impregnator 51 . The CA tow band 64 that has passed through the plasticizer impregnation device 51 is inserted between the transport rolls R11 and R12. The CA tow band 64 is impregnated with a plasticizer for molding by the plasticizer impregnation device 51, thereby bonding the plurality of CA fibers 61 together. Thereby, a three-dimensional mesh structure is formed by the plurality of CA fibers 61 . After that, the CA tow band 64 is introduced into the transport jet 52 and carried into the winding tube portion 53 by the jet stream.

At the winding tube portion 53, the CA toe band 64 is wound and formed into a columnar shape. As a result, a columnar filter material 66 including the CA tow band 64 is formed. A wrapping paper 69 is also guided toward the filter material 66 . The filter material 66 is conveyed through the winding tube portion 53, and a winding paper 69 is wound around the outer periphery of the filter material 66 and fixed.

The cutting device 56 cuts the filter material 66 to predetermined dimensions. A plug (rod) 67 is thus manufactured. Further cutting of plug 67 produces filter 68 which is a heated cigarette filter. The filter 68 includes a filter material 66 including a CA tow band 64 and a wrapping paper 69 wound around the filter material 66 .

As described above, the CA tow band 64 included in the filter 68 has a small amount of fly generated due to compression during packing. Therefore, the amount of fly mixed in the filter 68 is reduced. Filter 68 therefore has a stable quality. Filter 68 is also not overly packed with CA toe band 64 . As for the filter 68, the filling amount of the CA toe band 64 is appropriately set. The filter 68 thereby has a relatively low airflow resistance suitable for heated cigarette filters. Further, in this embodiment, the CA fibers 61 included in the filter 68 have an FD value in the range of 10 or more and 30 or less, and are relatively thick. Therefore, the filter 68 has good hardness without increasing the packing amount of the CA tow band 64 .

[heat-not-burn cigarette]
FIG. 5 is a cross-sectional view of a heated cigarette 80 according to an embodiment. Heat-not-burn cigarette 80 comprises unit 81 and replaceable cartridge 82 . As an example, the unit 81 controls a housing 83, a heating section 87 that heats the cartridge 82, a power supply 84 that is a driving source, a display section 85, an operation section 88, a display section 85, and a heating section 87. and a control unit 86 .

The cartridge 82 is an aerosol-generating article. Cartridge 82 includes base material 70 , hollow material 71 , coolant material 72 and tip 73 . As an example, the cartridge 82 is cylindrically shaped. The hollow member 71 , the coolant 72 , and the tip 73 are arranged side by side in the longitudinal direction and are integrally wound from the wrapping paper 74 . The cartridge 82 is inserted into an insertion opening 81a formed at the other end of the unit 81 in the longitudinal direction. At least one of the hollow material 71 and the coolant 72 of the cartridge 82 may include the CA toe band 64 . As a result, the material of the cartridge 82 can be shared. As a conventional aerosol-generating article, for example, the aerosol-generating article "Heat Stick" (registered trademark) for "iQOS" manufactured by Philip Morris Co., Ltd. can be exemplified.

The base material 70 contains tobacco components that can be vaporized by heating. The tobacco component of the base material 70 is vaporized by being heated by the heating section 87 . The base material 70 of this embodiment also contains a flavor component such as nicotine that can be vaporized by heating. Hollow material 71 is positioned between substrate 70 and coolant 72 . The hollow member 71 is formed in a tubular shape. The hollow material 71 allows components generated by heating the base material 70 to pass through the inside. The hollow member 71 also functions as a separator separating the base material 70 and the coolant 72 . The hollow member 71 prevents the cartridge 82 from being longitudinally compressed and the base material 70 crushed when the cartridge 82 is inserted into the unit 81 through the insertion port 81a. Hollow material 71 may include other materials such as polypropylene. The coolant 72 cools and agglomerates the gas component from the base material 70 that has passed through the hollow member 71 to generate aerosol (liquid). The coolant 72 includes, for example, a strip-shaped sheet body wound in the circumferential direction of the cartridge 82 or a strip-shaped sheet body finely folded so that each fold extends in the longitudinal direction of the cartridge 82 . In the coolant 72 , an aerosol flow path is formed by the gaps between the sheet bodies.

The chip 73 filters part of the components that have passed through the coolant 72 . Chip 73 is filter 68 . Chip 73 is located on the opposite side of cartridge 82 from substrate 70 . The tip 73 is held by the user when the heated cigarette 80 is used. Chip 73 filters the aerosol that has passed through coolant 72 .

It is preferable that the comfort of smoking a heated cigarette is close to that of a cigarette, which is a combustion smoking article that is lit and smoked, for example. Therefore, the tip 73 includes a CA tow band 64 in which a plurality of CA fibers 61 are crimped, like the cigarette filter used in the cigarette. Chips 73 have stable quality due to the small amount of fly mixed. Therefore, the heat-not-burn cigarette 80 can stably provide a good smoking taste.

Also, the FD of the CA fiber 61 included in the chip 73 of this embodiment is a value in the range of 10 or more and 30 or less. Thereby, the FD of the CA fibers 61 can be set to a relatively large value, and plenty of inter-fiber gaps in the CA tow band 64 can be secured. Therefore, the tip 73 manufactured using this CA tow band 64 can appropriately prevent aerosol from being excessively filtered. Therefore, it is possible to prevent deterioration in the quality of the chips 73 caused by frying caused by the compression of the CA tow band 64 during packing, and to manufacture chips 73 with excellent smoking taste.

(Confirmation test 1)
Next, confirmation test 1 will be described. In this test, sample Nos. shown below were used. 1-5 CA tow bands were produced. Sample no. CA toe bands 64 from 1 to 4 correspond to the examples. Sample no. The CA tow band of 5 corresponds to the comparative example. The CA tow bands of Samples 1 to 5 have titanium oxide contents in the range of 0% by mass or more and 0.01% by mass or less. That is, these CA tow bands are substantially free of titanium oxide. Note that the present disclosure is based on sample Nos. shown below. It is not limited to 1 to 4, 6, 7.

[Sample No. 1]
A spinning stock solution 60 was prepared by dissolving CA flakes (29% by mass) of cellulose diacetate having a degree of substitution of 2.47 in an organic solvent (a mixture of acetone and water). In order to discharge the spinning dope 60, a total of 15 spinnerets 11 having spinning holes 11a with an equilateral triangle (154 μm side length) and 88 holes were prepared. As a result, the cross-sectional shape of the spun CA fibers 61 was set to a Y shape. The FD of the CA fiber 61 is set to 19.2 by adjusting the discharge amount of the spinning stock solution 60 from the spinning hole 11a and the rotation speed of the pair of nip rolls R1 and R2 of the winding device and the crimping device 3. and the TD of the CA toe band 64 was set at 27,000. Furthermore, the nip pressure of the nip rolls R1 and R2 when crimping the ends 63, the depth of crimping of the CA fibers 61 by pushing the ends 63 into the stuffing box 13, and the peak-to-valley spacing of the crimped CA fibers 61 are By adjusting, the crimp ratio of the CA tow band 64 calculated by Equation 2 below was set to 40%. The crimp ratio is an index representing the stretch ratio of the toe band. Further, the drying time for drying the CA tow band 64 passed through the crimping device 3 by the drying device 4 was adjusted. As a result, the sample No. set so that the content of water after production was 8.0% by mass. A CA tow band 64 of 1 was obtained. This CA tow band 64 contains only water as a plasticizer.
[Formula 2]

Crimp ratio (%) = [(L1-L0)/L0] x 100

However, L0 is the length of the CA tow band when a load of 250 g is applied to the CA tow band having a length of 250 mm in the direction of extending the crimp of the CA fiber. L1 is the length of a CA tow band having a length of 250 mm when a load of 2500 g is applied in the direction in which the crimps of the CA fibers are stretched.

[Sample No. 2]
The crimp ratio was set at 35%. By adjusting the drying time, the water content of the CA tow band 64 after production was set to 10.0% by mass. Sample no. Based on the same manufacturing conditions and specifications as those of Sample No. 1, 2 CA tow band 64 was obtained.

[Sample No. 3]
A total of 15 spinnerets 11 having 145 spinning holes 11a with an equilateral triangular peripheral shape (side length 118 μm) were prepared for discharging the spinning dope 60 . As a result, the cross-sectional shape of the spun CA fibers 61 was Y-shaped. The FD of CA fiber 61 was set at 11.8 and the TD of CA tow band 64 was set at 25700. The crimp ratio of the CA tow band 64 was set at 56%. By adjusting the drying time, the water content of the CA tow band 64 after production was set to 10.0% by mass. Sample no. Based on the same manufacturing conditions and specifications as 1, sample No. 3 CA tow band 64 was obtained.

[Sample No. 4]
A spinning stock solution 60 was prepared by dissolving 29% by mass of CA flakes of cellulose diacetate having a degree of substitution of 2.40 and 1% by mass of glycerin diacetate as a plasticizer other than water in an organic solvent (a mixture of acetone and water). . A total of 16 spinnerets 11 having 88 spinning holes 11a with a peripheral shape of an equilateral triangle (side length of 154 μm) were prepared for discharging the spinning dope 60 . As a result, the cross-sectional shape of the spun CA fibers 61 was Y-shaped. The FD of CA fiber 61 was set at 19.2 and the TD of CA tow band 64 was set at 27,000. The crimp ratio of the CA tow band 64 was set at 48%. Further, by adjusting the drying time, the CA tow band 64 after production has a water content of 6.0% by mass and a concentration of glycerin diacetate as a plasticizer of 3.0% by mass. set. Sample no. Based on the same manufacturing conditions and specifications as 1, sample No. 4 CA tow band 64 was obtained.

[Sample No. 5]
The crimp ratio of the CA tow band was set at 45%. By adjusting the drying time, the water content of the CA tow band after production was set to 6.0% by mass. Sample no. Based on the same manufacturing conditions and specifications as 1, sample No. 5 CA tow bands were obtained.

Next, sample No. A plug (rod) was manufactured using CA tow bands 1 to 5 with filter manufacturing device 5 (winding machine "KDF-2" manufactured by Hauni Co., Ltd.). The nip pressure of the pretension rolls R5, R6 was set to 0.5 bar. A speed ratio V2/V1 between the rotation speed V1 of the first spread rolls R7 and R8 and the rotation speed V2 of the second spread rolls R9 and R10 was set to 1.4. Also, the speed ratio V3/V2 between the rotational speed V2 and the rotational speed V3 of the transport rolls R11 and R12 was set to 1.48.

Here, when manufacturing the plug, the CA fibers of the CA tow band for the heated cigarette filter are formed into a cylindrical shape. In order to retain the shape of the plug, the plasticizer forms a three-dimensional network structure of a plurality of CA fibers in the plug. For this reason, in this test, a plasticizer P (triglycerin acetate) different from the plasticizer contained in the CA tow band introduced into the filter manufacturing apparatus was added to the CA tow band by the plasticizer impregnation device 51 for the purpose of forming a plug. It was uniformly sprayed and attached to. The amount of plasticizer P attached was 7% by mass of the total weight of the CA tow band.

Also sample No. In 1 to 5, the circumferential length of the plug was set to 22.5 mm, and the length dimension of the plug was set to 120 mm. Sample no. In 1 to 2, 4 and 5, the amount of CA tow band stuffed into the plug (net tow weight) was set to 0.5 g/rod. Sample no. 3, the packing amount (net tow weight) of the CA tow band 64 in the plug was set to 0.47 g/rod.

　Sample No. The amount of fly produced per 15 minutes was measured during the production of plugs 1-5. In measuring the amount of fly generated, the fly remaining inside the box containing the rolls R7 to R10 was collected with a suction device (air sucker) and weighed with a balance.

Also, sample No. During the production of the plugs 1 to 5, it was investigated whether or not the plugs could be produced continuously for one hour without cleaning the inside of the box containing the rolls R7 to R10. Table 1 shows the test results.

　As shown in Table 1, sample No. In any of 1 to 4, sample No. Compared to 5, it was confirmed that the amount of fly generated during plug manufacturing was greatly reduced. Sample no. 1 to 4 were able to continue to wind up the plug within the tested range. On the other hand, sample no. In No. 5, a large amount of fly was generated during the production of the plug, and it was impossible to wind up (manufacture) the plug continuously. Sample no. In 1 to 4, it is considered that the CA tow band 64 manufactured and compressed and packed was appropriately plasticized with water as a plasticizer, so that the occurrence of fly due to the stress due to compression was appropriately prevented. be done.

Fig. 6 shows sample No. 1 is a graph showing the relationship between the number of days after production of

CA tow bands

1, 2 and 5 and the amount of fly generated. The fly yield shown in FIG. 6 was measured by the same method as when the values shown in Table 1 were measured. As shown in FIG. 6, sample no. With the CA tow band No. 5, it was confirmed that the amount of fly generated increased as the number of days increased from immediately after production. Sample no. The CA tow bands 64 of 1 and 2 contain crimped CA fibers 61 and a plasticizer whose content is in the range of 8% by mass to 12% by mass and which plasticizes the CA fibers 61. , it was confirmed that even after 400 days after production, the amount of fly generated immediately after production can be maintained.

(Confirmation test 2)
Next, confirmation test 2 will be described. In this test, sample no. 6-8 were produced and used.
[Sample No. 6]
Sample no. 2 CA tow band 64 (500 kg) was compressed and baled to produce a CA tow band deposit 65 (rectangular parallelepiped of 97 cm long, 120 cm wide and 90 cm high). In addition, two sheets (1600 mm long × 1800 mm wide) that mainly cover the lower surface and the upper surface of the CA tow band deposit 65 individually, and mainly cover a total of four side surfaces of the CA tow band deposit 65 One sheet (900 mm×5000 mm) (both sheets made of LDPE and having a thickness of 150 μm) was prepared as the

packaging materials

22 and 23 . These three sheets covered the entire surface of the CA tow band deposit 65 . After that, a hot plate of a heat sealer heated to 120° C. was pressed from above on the overlapped portion of each sheet. Thus, the sheets were welded together. As a result, sample No. 1 corresponding to the embodiment, in which the water vapor permeability of the

packaging materials

22 and 23 was set to 3 g/m ² ·day, was manufactured. 6 veils 20 were produced. The bail 20 does not strictly seal the overlapping portions of the sheets, and does not include the paperboard material 21 and the binding band B. As shown in FIG.

[Sample No. 7]
Next, sample no. 2 CA tow band 64 (500 kg) was compressed and packed to produce a CA tow band deposit 65 (rectangular parallelepiped of 97 cm long, 120 cm wide and 90 cm high). In addition, two sheets (1600 mm long × 1800 mm wide) that mainly cover the lower surface and the upper surface of the CA tow band deposit 65 individually, and mainly cover a total of four side surfaces of the CA tow band deposit 65 One sheet (900 mm×5000 mm) was prepared as

packaging materials

22 and 23 . As the

packaging materials

22 and 23, a composite sheet (total thickness: 150 μm) is used, which is made by bonding two PE strips with a thickness of 25 μm crossed to an OPP (biaxially oriented polypropylene) sheet with a thickness of 100 μm. board.

These three composite sheets covered the entire surface of the CA tow band deposit 65 so that the CA tow band deposit 65 was not exposed. Thereafter, the lower surface, upper surface and side surfaces of the CA tow band deposit 65 were covered with a paperboard material (interleaving paper) 21 having a thickness of 2 mm with the three sheets interposed therebetween. Next, a PET (polyethylene terephthalate) band having a width of 15 mm and a thickness of 0.2 mm was used as a binding band B. The rectangular parallelepiped CA tow band deposit 65, the composite sheets, and the paperboard material 21 were bound and fixed with a plurality of the PET bands. At this time, a plurality of the PET bands, 3 in the vertical direction, 6 in the horizontal direction, and 2 in the height direction, were arranged orthogonally, and the banding and fixing were performed. As a result, sample No. 1 corresponding to the embodiment in which the water vapor transmission rate of the

packaging materials

22 and 23 was set to 1 g/m ² ·day was obtained. 7 veils 20 were produced. In the veil 20, the overlapping portions of the composite sheets are not strictly sealed.

[Sample No. 8]
Sample no. 2 CA tow bands (500 kg) were compressed and baled to produce CA tow band deposits (97 cm long, 120 cm wide and 90 cm high cuboids). In addition, two sheets (1600 mm long × 1800 mm wide) that mainly cover the lower surface and the upper surface of the CA tow band deposit individually, and one sheet that mainly covers a total of four side surfaces of the CA tow band deposit collectively A sheet (900 mm×5000 mm) (both sheets made of LDPE and having a thickness of 100 μm) was prepared as a packaging material. These three sheets covered the entire surface of the CA tow band deposit and did not expose the CA tow band deposit. After that, the lower surface, upper surface and side surfaces of the CA tow band deposit were covered with a paperboard material (interleaving paper) having a thickness of 2 mm with the three sheets interposed therebetween. Next, a PET band having a width of 15 mm and a thickness of 0.2 mm was used as a binding band. The rectangular parallelepiped CA tow band stack, each of the sheets, and the paperboard material were bound and fixed with a plurality of the PET bands. At this time, a plurality of the PET bands, 3 in the vertical direction, 6 in the horizontal direction, and 2 in the height direction, were arranged orthogonally, and the banding and fixing were performed. As a result, sample No. 1, in which the water vapor transmission rate of the packaging material was set to 10 g/m ² ·day, was obtained. 8 bales were produced. This sample no. No. 8 bale is not strictly sealed at the overlapping portions of the sheets.

Next, sample No. Each of 6 to 8 bales was stored for 6 months in an indoor storage (average temperature 20°C, average humidity 75% RH). Each bale package was then opened and the water content of the CA tow band was measured. Also, sample no. Using the CA tow bands immediately after opening the packages of Nos. 6 to 8, plugs were manufactured in the same manufacturing method as in Confirmation Test No. 1. Also, sample no. Fry production per 15 minutes was measured during the production of 6-8 plugs. When measuring the amount of fly generated, the fly remaining inside the box containing the rolls R7 to R10 was collected with an air sucker and weighed with a balance. Also, sample no. In producing the plugs No. 6 to 8, it was investigated whether or not the plugs could be produced continuously for one hour without cleaning the inside of the box containing the rolls R7 to R10. Table 2 shows the test results.

　As shown in Table 2, sample No. 6 and 7, it was confirmed that the reduction in the water content from the beginning of packaging of the CA tow band 64 six months after the packaging of the CA tow band 64 can be suppressed more than in Comparative Example 2. Also sample no. It was confirmed that No. 6 and No. 7 can significantly reduce the amount of fly generated when the plug 67 is manufactured, compared to Comparative Example No. 2. Sample no. 6-8, the CA tow band deposit 65 is not strictly sealed by the

wrappers

22,23. Therefore, sample no. In 6 and 7, when the CA tow band deposit 65 is strictly sealed by the packaging material so as to correspond to the above modified example, it is possible to further reduce the decrease in the water content and the amount of fly generation. Conceivable.

Each configuration, each method, and combinations thereof in the embodiments are examples, and additions, omissions, replacements, and other changes can be made as appropriate without departing from the scope of the present disclosure. be. This disclosure is not limited by the embodiments, but only by the claims. Also, each aspect disclosed in this specification may be combined with any other feature disclosed in this specification.

The method of adding a plasticizer to the CA tow band 64 to prevent fly is not limited to adding the plasticizer to the spinning dope 60 . For example, the plasticizer may be impregnated with the spinning dope 60 discharged from the spinneret 11 . In this case, the plasticizer may be impregnated to the CA fibers by impregnation roll R0, for example. Also, the plasticizer may be attached to the CA fibers 61 between the godet roll GR and the crimping device 3 .

20, 25 bales (toe band packing goods for heated cigarette filters)
22, 23, 26 Packaging material 64 CA tow band (toe band for heated cigarette filter)
73 chips (heated cigarette filters)
80 heated tobacco

Claims

Comprising crimped cellulose acetate fibers and a plasticizer that plasticizes the cellulose acetate fibers,
A toe band for a heated cigarette filter, wherein the content of the plasticizer is in the range of 8% by mass or more and 12% by mass or less.
including water as the plasticizer;
2. The toe band for a heated cigarette filter according to claim 1, wherein the water content is in the range of 8% by mass or more and 12% by mass or less.
3. The plasticizer according to claim 1 or 2, wherein the plasticizer includes at least one of a glycerin ester plasticizer, a citrate ester plasticizer, an adipic acid plasticizer, a phthalate plasticizer, acetone, and diethylene glycol. Toe band for heated cigarette filters.
The toe band for a heated cigarette filter according to any one of claims 1 to 3, wherein the cellulose acetate fiber has a FD of 10 or more and 30 or less.
The toe band for a heated cigarette filter according to any one of Claims 1 to 4, wherein the cellulose acetate fiber has a degree of substitution in the range of 2.0 or more and 2.7 or less.
The toe band according to any one of claims 1 to 5, which is formed in a sheet shape;
a wrapping material arranged to wrap at least a portion of the toe band;
A toe band packing article for a heated cigarette filter, wherein the water vapor transmission rate of the wrapping material is in the range of 5 g/m 2 /day or less.
the wrapping material is arranged to wrap the entire outer surface of the toe band;
7. The toe band packing article for heated cigarette filters according to claim 6, wherein said water vapor transmission rate of said wrapping material is in the range of 2 g/m <2> /day or less.