WO2015060088A1

WO2015060088A1 - Cigarette filter

Info

Publication number: WO2015060088A1
Application number: PCT/JP2014/076363
Authority: WO
Inventors: 哲哉吉村; 龍北岡
Original assignee: 日本たばこ産業株式会社
Priority date: 2013-10-25
Filing date: 2014-10-02
Publication date: 2015-04-30
Also published as: TW201521607A; JP2016220545A

Abstract

Provided is a cigarette filter in which the smoke component adsorption ability of the adsorbent can be restored even when the number of puffs increases during smoking. The present invention is a cigarette filter that is connected to one end of a tobacco rod in which shredded tobacco is wound in rolling paper, wherein a molded adsorbent, which is a molding containing an adsorbent for adsorbing smoke components and a molding binder, is built into the filter and the molded adsorbent is configured so as to be crushable by a pressing action while smoking.

Description

Cigarette filter

The present invention relates to a cigarette filter.

フィルタ Filter cigarettes with a filter provided on the cigarette mouth are widely known. In the filter cigarette, a filter is connected to one end of a tobacco rod (winding portion) in which a tobacco cut is wound by a wrapping paper via a chip paper. Such a cigarette filter is formed, for example, by wrapping a filter medium such as an acetate fiber bundle with a web.

In recent years, as a method for mildly tasting a cigarette, a technique is known in which an adsorbent having the ability to adsorb smoke components contained in mainstream smoke, such as activated carbon, is incorporated in a filter (see, for example, Patent Document 1).

JP 2001-120250 A

However, although a method of arranging an adsorbent such as activated carbon in the filter is known, there has been a problem that the adsorbability of the smoke component by the adsorbent gradually decreases with the progress of smoking (puff). This invention is made in view of such a situation, Comprising: Even if the frequency | count of the puff at the time of smoking increases, the filter for cigarettes which can recover | recover the adsorption ability of the smoke component by an adsorbent is provided. For the purpose.

In the present invention, the following means are adopted in order to solve the above problems. That is, the cigarette filter according to the present invention is a cigarette filter connected to one end of a tobacco rod wound with a cigarette with a wrapping paper, and the filter includes an adsorbent that adsorbs the smoke component and a molding material. A molded adsorbent, which is a molded body including a binder, is incorporated, and the molded adsorbent is configured to be crushed by a pressing operation during smoking.

According to the present invention, when the molded adsorbent is crushed by the pressing operation during smoking, the surface area of the portion of the adsorbent that can be brought into contact with the mainstream smoke is increased compared to that before the crush. Therefore, the ability to adsorb smoke components in the molded adsorbent can be recovered by crushing the molded adsorbent. Therefore, according to this invention, even if the frequency | count of the puff at the time of smoking increases, the adsorption | suction ability of the smoke component by an adsorbent can be recovered.

In the present invention, the molded adsorbent occupies a part of the cross section of the filter, and mainstream smoke is circulated in a hollow portion of the cross section of the filter that is not occupied by the molded adsorbent. The smoke flow path to be made may be formed. The mainstream smoke can be smoothly guided to the downstream side through the smoke flow path formed in the hollow portion, and the smoke component of the mainstream smoke passing through the hollow portion can be adsorbed by the adsorbent. In the present invention, the molded adsorbent may have a column shape, and a communication hole extending in a longitudinal axis direction of the filter may be formed as the smoke flow path.

In the present invention, a thin-walled portion may be formed on a part of the molded adsorbent so that the molded adsorbent can be easily crushed during a pressing operation by reducing the wall thickness compared to other parts. . In this way, by arranging the thin portion in a part of the molded adsorbent, the molded adsorbent can be more easily crushed during the pressing operation. Moreover, by comprising in this way, a shaping | molding adsorption material can be divided | segmented into a some small piece by making a thin-wall part into a boundary at the time of pressing operation. Therefore, by adjusting the number and position of forming the thin portion in the molded adsorbent, the number and size of the molded adsorbent divided into small pieces at the time of crushing can be set. Thereby, it becomes easy to adjust the surface area of the part which can contact the mainstream smoke of the adsorbent after crushing the molded adsorbent to a desired size. As a result, the ability to adsorb smoke components by the shaped adsorbent after being crushed can be suitably adjusted.

Further, the filter according to the present invention is arranged so as to cover the outer peripheral portion of the molded adsorbent, and when the molded adsorbent is crushed, at least one of the filter paper and chip paper is damaged. You may have further the protection part which suppresses. By configuring the filter in this way, it is possible to suitably suppress damage to the web (plug wrap) and the chip paper during the pressing operation. In addition, the said protective material may serve as winding paper, chip paper, etc. which wind up a shaping | molding adsorption material integrally with a filter medium, and may be a member different from these.

In the filter according to the present invention, the molded adsorbent is a cylindrical molded body that includes activated carbon, a molding binder, and calcium carbonate and is molded into a cylindrical shape, and the cylindrical molded body has a crushing strength of 6. It is preferable that it is 33N or more and 24.21N or less. By doing so, a comfortable crushing feeling can be provided to the user.

In addition, the means for solving the problems in the present invention can be employed in combination as much as possible.

According to the present invention, it is possible to provide a cigarette filter that can recover the adsorption ability of the smoke component by the adsorbent even when the number of puffs during smoking increases.

1 is a side view of a cigarette according to Embodiment 1. FIG. It is a figure which shows schematic structure of the cigarette which concerns on Embodiment 1. FIG. 1 is a perspective view of an activated carbon molded body according to Embodiment 1. FIG. FIG. 5 is a cross-sectional view taken along the line BB in FIG. 1. It is a figure which shows an example of the relationship between the smoke component adsorption capacity and the puff frequency in an activated carbon molded object. It is a figure which shows an example of the crushed activated carbon molded object. It is a figure which shows various conditions of the activated carbon molded object which evaluates the relationship between crushing strength and crushing comfort. It is a figure which shows the list of the measurement result of crushing strength, and the sensory test result of crushing comfort. It is a graph which shows the measurement result of the crushing strength of an activated carbon molded object. It is a graph which shows the sensory evaluation result of the crushing comfort of an activated carbon molded object. It is a graph which shows the relationship between the crushing strength of an activated carbon molded object, and crushing comfort. It is a figure which shows the modification of an activated carbon molded object (1). It is a figure which shows the modification of an activated carbon molded object (2). It is a figure which shows the modification of an activated carbon molded object (3). It is a figure which shows the cross section of the filter which concerns on Embodiment 2. FIG. It is a figure which shows an example of the crushed activated carbon molded object.

Here, an embodiment of a cigarette filter according to the present invention will be described with reference to the drawings. Further, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the present embodiment are not intended to limit the technical scope of the invention only to those unless otherwise specified. Absent.

<Embodiment 1>
FIG. 1 is a side view of a cigarette 1 according to the first embodiment. FIG. 2 is a diagram illustrating a schematic structure of the cigarette 1 according to the first embodiment. The cigarette 1 has a tobacco rod 2 and a filter 4 connected to one end of the tobacco rod 2 via a chip paper (chip paper) 3. The tobacco rod 2 is obtained by winding a tobacco stamp 21 with a wrapping paper 22, and is formed into a cylindrical shape (bar shape). The tobacco rod 2 may be called a “single roll”. The filter 4 is also formed in a columnar shape (bar shape) as shown in FIG. An arrow A in FIG. 1 indicates the longitudinal axis direction of the cigarette 1 (the tobacco rod 2 and the filter 4). Hereinafter, in the present specification, a cross section perpendicular to the longitudinal axis of the cigarette 1 (the tobacco rod 2 and the filter 4) is referred to as a “cross section” below.

The filter 4 is a member for filtering smoke components contained in the mainstream smoke when the mainstream smoke generated when the cigarette 1 is smoked is passed. Hereinafter, the end of the filter 4 that is connected to the tobacco rod 2 is referred to as a “connection end 40”, and the end opposite to the connection end is referred to as a “suction end 41”. The mouth end 41 of the filter 4 is the end of the filter 4 that can be scolded by a smoker.

Inside the filter 4, an activated carbon molded body 5 (molded adsorbent) and a filter segment 6 are arranged in this order from the connection end 40 side of the tobacco rod 2. The filter segment 6 is, for example, a filter medium (filter medium) obtained by winding a fiber bundle in which cellulose acetate is formed into a cylindrical shape with a wrapping paper. The activated carbon molded body 5 is a molded body formed by mixing activated carbon as an adsorbent that adsorbs smoke components contained in mainstream smoke, a molding binder, and calcium carbonate. FIG. 3 is a perspective view of the activated carbon molded body 5 according to the present embodiment. The activated carbon molded body 5 shown in FIG. 3 has a columnar shape (cylindrical shape), and a communication hole 51 extending along the longitudinal axis direction is formed.

Reference numerals

5 a and 5 b denote a front end face and a rear end face in the longitudinal axis direction of the activated carbon molded body 5. The communication hole 51 of the activated carbon molded body 5 is a through hole extending in parallel with the longitudinal axis direction from the front end surface 5 a to the rear end surface 5 b of the activated carbon molded body 5. In the example shown in FIG. 3, a single communication hole 51 having a circular cross section is provided in the activated carbon molded body 5, but the cross-sectional shape and number of the communication holes 51 can be changed as appropriate.

The activated carbon molded body 5 is built in the filter 4 so that the longitudinal axis direction thereof is parallel to the longitudinal axis direction of the filter 4. More specifically, the activated carbon molded body 5 is disposed in the filter 4 in such a posture that the front end face 5 a faces the connection end 40 side of the filter 4 and the rear end face 5 b faces the mouth end 41. 4 is a cross-sectional view taken along line BB in FIG. FIG. 4 shows a cross section of the filter 4. As shown in FIG. 4, the outermost layer of the filter 4 is composed of chip paper 3. Then, a plug wrap 7 and an activated carbon molded body 5 which are winding papers are arranged from the chip paper 3 toward the center of the filter 4.

The plug wrap 7 is a web that winds up the outer periphery of the activated carbon molded body 5 and the filter segment 6. The activated carbon molded body 5 and the filter segment 6 are integrated by being wound up by the plug wrap 7, and as a result, the filter 4 is molded. Further, the tobacco rod 2 and the filter 4 are wound around the chip paper 3 and are integrally connected. The chip paper 3 is bonded to the plug wrap 7 and the wrapping paper 22 so as to cover the entire outer periphery of the filter 4 and to cover the end portion side of the wrapping paper 22 in the tobacco rod 2.

As shown in FIG. 4, the activated carbon molded body 5 occupies a part of the cross section of the filter 4, and the communication hole 51 is formed as a hollow portion that is not occupied by the activated carbon molded body 5 in the cross section of the filter 4. Is formed. The communication hole 51 extending along the longitudinal axis direction of the activated carbon molded body 5 functions as a smoke flow path through which mainstream smoke flows during smoking.

The activated carbon molded body 5 according to the present embodiment is a molded body formed by mixing activated carbon, a molding binder, and calcium carbonate as described above. As the activated carbon, activated carbon for cigarette filters that is usually used for charcoal filters can be used. The molding binder may be an organic binder, an inorganic binder, or a combination thereof. In the present embodiment, carboxymethyl cellulose (CMC) is used as the molding binder, but the present invention is not limited to this.

The activated carbon molded body 5 can be suitably manufactured by, for example, an extrusion molding method. However, various methods can be adopted as a method for producing the activated carbon molded body 5. Here, as an example of the manufacturing process of the activated carbon molded body 5 by the extrusion molding method, a predetermined amount of water is added to a light mixture of a predetermined amount of activated carbon, CMC, and calcium carbonate, and mixing is performed for a predetermined time by a mixer. And it is possible to obtain the activated carbon molded object 5 by performing the extrusion molding which extrudes from a metal mold | die in the state which pressurized the mixed material after mixing using an extrusion molding machine (granulator).

The activated carbon molded body 5 in the present embodiment is formed so as to be crushed (collapsed) by a pressing (crushing) operation by a smoker during smoking. The crushing operation here refers to an operation in which a smoker smoking the cigarette 1 applies an appropriate pressure to the activated carbon molded body 5 with a finger that picks (holds) the filter 4. Here, the state in which the activated carbon molded body 5 is not crushed, that is, the state of the activated carbon molded body 5 shown in FIG. 3 is referred to as a “non-collapsed state”, and the state in which the activated carbon molded body 5 is crushed by the crushing operation is referred to as “collapsed state”. " At the time when the smoker starts smoking cigarette 1, activated carbon molded body 5 is in a non-collapsed state where it is not crushed. The activated carbon molded body 5 is an activated carbon molded body that adsorbs smoke components contained in the mainstream smoke as described above, and the surface area of the activated carbon molded body 5 (more specifically, the surface area of the portion that can come into contact with the mainstream smoke) increases. , Smoke component adsorption capacity (hereinafter referred to as “smoke component adsorption capacity”) increases. Then, as the number of puffs during smoking increases, the amount of smoke component adsorbed on the activated carbon in the activated carbon molded body 5 increases, so that the smoke component adsorption capacity of the activated carbon molded body 5 gradually decreases.

FIG. 5 shows an example of the relationship between the smoke component adsorption capacity and the number of puffs in the activated carbon molded body 5. In the present embodiment, the weight of the activated carbon contained in the activated carbon molded body 5 is adjusted so that the smoke component adsorbing ability of the activated carbon molded body 5 satisfies the predetermined required performance when the cigarette 1 starts smoking. If the smoke component adsorption capacity of the activated carbon molded body 5 at the start of smoking is defined as “initial adsorption capacity”, the smoke component adsorption capacity of the activated carbon molded body 5 gradually decreases from the initial adsorption capacity as the number of puffs increases. .

Smoking smoker performs the above-mentioned crushing operation at any timing during smoking. When the crushing operation is performed by the smoker, the activated carbon molded body 5 incorporated in the filter 4 is crushed. FIG. 6 is a diagram illustrating an example of the collapsed activated carbon molded body 5. As shown in FIG. 6, when the activated carbon molded body 5 is crushed and divided into a plurality of small pieces, the surface area of the portion of the activated carbon molded body 5 that can come into contact with the mainstream smoke increases as compared to the non-collapsed state. For example, in the example shown in FIG. 6, the smoke adsorbing capacity is recovered from the point A to the point B when the activated carbon molded body 5 is crushed. Here, the greater the degree of increase in the surface area of the portion that can come into contact with the mainstream smoke before and after the collapse of the activated carbon molded body 5, the greater the degree of recovery of the smoke component adsorbing ability in the activated carbon molded body 5. In addition, typically, the crushing operation by the smoker is performed at the timing when the smoker feels that the taste characteristic has changed as the number of puffs increases.

As described above, according to the filter 4 in the present embodiment, the activated carbon molded body 5 that is formed so as to be crushed by the crushing operation by the smoker is incorporated, and therefore, at any timing desired by the smoker, the activated carbon molded body. 5 can recover the smoke component adsorption capacity. As a result, the taste of the cigarette 1 can be changed.

Moreover, as above-mentioned, the activated carbon molded object 5 is crushed by the press operation at the time of smoking the filter 4 in this embodiment. At that time, the collapsed activated carbon molded body 5 is divided into a plurality of small pieces. For example, if the smoker has too strong force to press the activated carbon molded body 5, the plug wrap 7 and the chip paper 3 are torn. There is a risk that.

Therefore, in the filter 4 in the present embodiment, a protective material for preventing the plug wrap 7 and the chip paper 3 from being damaged when performing a pressing operation to crush the activated carbon molded body 5 is used. It is good to arrange so that an outer peripheral part may be covered. For example, the protective material may be formed of paper having a relatively large thickness or basis weight, may be formed of a resin such as plastic, or may be formed of cellophane tape (cello tape (registered trademark)). Good. The protective material may also serve as at least one of the plug wrap 7 (winding paper) and the chip paper 3. In the present embodiment, for example, the plug wrap 7 also serves as a protective material by forming the plug wrap 7 that integrally winds the activated carbon molded body 5 and the filter segment 6 with plastic. Thus, by covering the outer peripheral portion of the activated carbon molded body 5 with a protective material (in this embodiment, a plastic plug wrap 7), it is preferable that the plug wrap 7 and the chip paper 3 are damaged during the pressing operation. Can be suppressed. In this embodiment, the plug wrap 7 also serves as a protective material that covers the outer peripheral portion of the activated carbon molded body 5, but at least a portion of the chip paper 3 that covers the outer peripheral portion of the activated carbon molded body 5 is formed of plastic or the like. You may make it also serve as a protective material. Moreover, you may arrange | position the protective material which covers the outer peripheral part of the activated carbon molded body 5 as a separate member from the plug wrap 7 or the chip paper 3. FIG.

Incidentally, the activated carbon molded body 5 in the present embodiment is a molded body formed by mixing activated carbon as an adsorbent, CMC as a molding binder, and calcium carbonate as described above. Here, by changing the blending ratio of the activated carbon, CMC, and calcium carbonate in the activated carbon molded body 5, the smoke component adsorption ability and the crushing strength (breaking strength) of the activated carbon molded body 5 can be respectively changed. For example, the ratio of activated carbon to calcium carbonate contained in the activated carbon molded body 5 is defined as “activated carbon ratio”. Here, the larger the activated carbon ratio in the activated carbon molded body 5, the greater the initial adsorption capacity of the activated carbon molded body 5 and the smaller the crushing strength. On the other hand, the smaller the activated carbon ratio in the activated carbon molded body 5, the smaller the initial adsorption capacity of the activated carbon molded body 5 and the greater the crushing strength. In the present embodiment, the activated carbon ratio of the activated carbon molded body 5 is determined so that both the initial adsorption capacity and the crushing strength of the activated carbon molded body 5 are well balanced within an appropriate range. In addition, the appropriate range of the crushing strength in the activated carbon molded body 5 is, for example, that the activated carbon molded body 5 is not so fragile that it is carelessly collapsed, but the activated carbon molded body 5 is pressed by a smoker with an appropriate force with a finger. Refers to the range of crushing strength that can be crushed. In the present embodiment, for example, the mixing ratio of activated carbon, CMC, and calcium carbonate in the activated carbon molded body 5 is set to about 80%, 5%, and 15%, respectively. It can be appropriately changed according to the required initial adsorption capacity and crushing strength.

Here, the Example which manufactures the activated carbon molded object 5 is demonstrated. When the activated carbon molded body 5 is manufactured, a predetermined amount of activated carbon (for example, Kuraray Chemical Co., Ltd., Sakai SA2300, particle size 0.2 μm), CMC (for example, Daiichi Kogyo Seiyaku Co., Ltd., Serogen-Made F-SA), and calcium carbonate (for example, Shiroishi) Kogyo Co., Ltd.-made PC-700) was prepared, and these were lightly mixed to make uniform. Then, a predetermined amount of water was added to the activated carbon, CMC, and calcium carbonate, and the mixture was mixed at room temperature for 5 minutes using a mixer (Aikosha Seisakuken Mix Co., Ltd.). Then, the mixed material after mixing is extruded using an extruder (produced by Fuji Powder Co., Ltd.) and dried at 100 ° C. for 12 hours or longer using a dryer (Yamato Scientific Co., Ltd. Fine Oven DH42). Thus, a long extruded product was obtained. And the activated carbon molded object 5 was produced by cut | disconnecting a long extrusion molded object to predetermined length.

<Evaluation of crushing strength>
Next, about the activated carbon molded object 5 produced by the method mentioned above, the relationship between the crushing strength and crushing comfort was evaluated. The activated carbon molded body 5 was produced as a cylindrical body having an outer diameter of 6 mm and a length of 10 mm as shown in FIG. Various conditions in each lot of the activated carbon molded body 5 for evaluating the relationship between the crushing strength and the crushing comfort are shown in FIG. In FIG. 7, the composition ratio of activated carbon, CMC, and calcium carbonate contained in the activated carbon molded body 5 and the thickness (layer thickness) of the activated carbon molded body 5 are shown for each lot (lot C, F, T, S). .

8 to 11 show the results of evaluating the relationship between the crushing strength and the crushing comfort of the activated carbon molded body 5. FIG. 8 is a diagram showing a list of the measurement results of the crushing strength of the activated carbon molded body 5 and the sensory test results of the crushing comfort. FIG. 9 is a graph showing the measurement results of the crushing strength of the activated carbon molded body 5. FIG. 10 is a graph showing the sensory evaluation results of the crushing comfort of the activated carbon molded body 5. FIG. 11 is a graph showing the relationship between the crushing strength and the crushing comfort of the activated carbon molded body 5.

(Measurement method of crushing strength)
The crushing strength of the activated carbon molded body 5 was measured by the following method using a rheometer (manufactured by Sun Science Co., Ltd., product number: CR-3000EX). The side surface of the activated carbon molded body 5 is sandwiched between two parallel plates, and the two parallel plates are brought close to each other at a constant speed (20 m / min) to compress the activated carbon molded body 5 from the side, and the activated carbon molded body 5 is crushed. The crushing load was measured. For the measurement of the crushing strength of the activated carbon molded body 5, 20 samples were prepared for each lot, and the average value of the crushing load in each lot was shown as the compressive strength of the activated carbon molded body 5 in FIGS.

(Sensory test for crushing comfort)
Next, a sensory test method relating to the crushing comfort of the activated carbon molded body 5 will be described. The sensory test for crushing comfort is to produce a plurality of cigarettes 1 in which the activated carbon molded body 5 of each lot is incorporated in the

filter

4, and 10 evaluators (male: 5 and female: 5) perform activated carbon molding by crushing action. The crushing feeling when the body 5 was crushed was evaluated. The evaluation of crushing comfort is "very dissatisfied (1)", "very dissatisfied (2)", "slightly dissatisfied (3)", "neither (4)", "slightly satisfied (5)", "pretty much A scale axis having seven steps of “satisfied (6)” and “very satisfied (7)” at equal intervals was used. And about the cigarette 1 which incorporated the activated carbon molded object 5 which concerns on each lot, the average value of the evaluation value of the ease of crushing of the activated carbon molded object 5 by ten evaluators was calculated, respectively, and the result is shown in FIG. 8 and FIG. It was shown to. The crushing comfort of the activated carbon molded body 5 means that the higher the evaluation value, the higher the evaluator's satisfaction with respect to the crushing comfort.

As shown in FIGS. 8 to 11, the activated carbon molded body 5 according to the lot T had the highest crushing feeling evaluation. Next, the evaluation of crushing comfort was high in the order of lots C and F, and the evaluation of lot S was the lowest. Here, for the lot T (evaluation value 5.4), the lot C (evaluation value 4.9), and the lot F (evaluation value 4.1) whose evaluation values are higher than 4, the crushing comfort is “neither”. It can be evaluated that it corresponds to the “satisfied” side. As shown in FIG. 8, the crushing strengths of the activated carbon molded bodies 5 corresponding to the lot T, the lot C, and the lot F are 15.12 N (standard deviation σ: 3.22 N), 9.13 N (standard deviation σ: 2. 77N), 18.99N (standard deviation σ: 5.22N).

From the above, the crushing strength of the activated carbon molded body 5 is preferably 6.33 N or more and 24.21 N or less, and particularly preferably 11.90 N or more and 18.34 N or less. By using the activated carbon molded body 5 having such a crushing strength, a comfortable crushing feeling can be provided to the user. In the crushing strength of the activated carbon molded body 5, the lower limit value 6.33N of the preferred range is a value obtained by subtracting 1σ from the crushing strength (average value) of lot C, and the upper limit value 24.21N is crushing strength of lot F. It is a value obtained by adding 1σ to the intensity (average value). Moreover, the lower limit value 11.90N of the particularly preferable range is a value obtained by subtracting 1σ from the crushing strength (average value) of the lot T, and the upper limit value 18.34N adds 1σ to the crushing strength (average value) of the lot T. Value.

<Modification>
12A to 12C are views showing a modification of the activated carbon molded body 5. As shown in FIGS. 12A and 12B, the cross-sectional shape and number of the communication holes 51 in the activated carbon molded body 5 can be changed as appropriate. Moreover, as shown to FIG. 12C, the activated carbon molded body 5 in this embodiment does not necessarily need to be provided with the communicating hole 51. FIG. Specifically, the activated carbon molded body 5 is provided so as to occupy a part of the cross section of the filter 4, and the smoke flow path for distributing the mainstream smoke to the hollow portion 51 </ b> A that is not occupied by the activated carbon molded body 5 in the cross section of the filter 4. May be formed. Also in the activated carbon molded body 5 as shown in FIG. 12, the smoke component of the mainstream smoke passing through the hollow portion 51A can be adsorbed by the activated carbon supported on the activated carbon molded body 5, and the activated carbon molded body 5 is crushed. Thus, the smoke component adsorption ability can be recovered (increased).

<Embodiment 2>
Next, the activated carbon molded body 500 according to Embodiment 2 will be described. FIG. 13 is a diagram illustrating a cross section of the filter 4A according to the second embodiment. The activated carbon molded body 500 in the present embodiment is provided with a thin portion 52 at a part thereof. The thin portion 52 is a portion formed with a smaller thickness than other portions, and is a component for facilitating the collapse of the activated carbon molded body 500 during the pressing operation. In the example shown in FIG. 13, the thin-walled portions 52 are provided at four locations in the cross section of the activated carbon molded body 500, but the number and position can be changed as appropriate. By forming the thin-walled portion 52 in the activated carbon molded body 500 as in this embodiment, the activated carbon molded body 500 can be more easily crushed during the pressing operation.

FIG. 14 shows the activated carbon molded body 500 in a state of being crushed by the pressing operation during smoking. As shown in FIG. 14, since the thin-walled portion 52 in the activated carbon molded body 500 can be said to be a weaker portion than other parts, the activated carbon molded body 500 is divided into a plurality of small pieces at the thin-walled portion 52 during the pressing operation. Divided into 500A to D. Therefore, the number and size of the small pieces 500A to D obtained by crushing the activated carbon molded body 500 can be set by adjusting the number and position of forming the thin portions 52. That is, it becomes easy to adjust the surface area of the portion that can contact the mainstream smoke of the activated carbon after the activated carbon molded body 500 is crushed to a desired size. As a result, the smoke component adsorption ability of the activated carbon molded body 500 after being crushed can be suitably adjusted.

The preferred embodiments and modifications of the present invention have been described above, but it is obvious to those skilled in the art that the cigarette filter according to the present invention can be variously changed, improved, combined, and the like. For example, in the embodiments and modifications described above, the activated carbon molded body 5 is described as an example of the molded adsorbent, but the activated carbon molded body 5 is limited as long as it is a molded body including the adsorbent and a molding binder. It is not something. Instead of the activated carbon molded body 5, for example, an adsorbent such as kaolin, zeolite, silica gel, and porous cellulose particles may be applied to form the molded adsorbent.

DESCRIPTION OF SYMBOLS 1 ... Cigarette 2 ... Tobacco rod 3 ... Chip paper 4 ... Filter 5 ... Activated carbon molded body 6 ... Filter segment 7 ... Plug wrap 21 ... Tobacco stamp 22 ... -Wrapping paper 40 ... Connection end 41 ... Mouth end 51 ... Communication hole 52 ... Thin part

Claims

A cigarette filter connected to one end of a tobacco rod wound with a cigarette paper,
The filter is
Built-in molded adsorbent that is a molded body containing an adsorbent that adsorbs the smoke component and a molding binder,
The molded adsorbent is configured to be crushed by a pressing operation during smoking.
Cigarette filter.
The molded adsorbent occupies a part of the cross section of the filter,
Of the cross section in the filter, a smoke flow path is formed for circulating mainstream smoke in the hollow portion not occupied by the molded adsorbent,
The filter for cigarettes of Claim 1.
The molded adsorbent has a column shape,
A communication hole extending in the longitudinal axis direction of the filter is formed as the smoke flow path.
The filter for cigarettes of Claim 2.
A thin part is formed on a part of the molded adsorbent to make it easier to crush the molded adsorbent during the pressing operation by reducing the thickness compared to other parts.
The cigarette filter according to any one of claims 1 to 3.
And a protective material that is disposed so as to cover an outer peripheral portion of the molded adsorbent, and that prevents at least one of the filter paper and chip paper from being damaged when the molded adsorbent is crushed. ,
The cigarette filter according to any one of claims 1 to 4.
The molded adsorbent is a cylindrical molded body that includes activated carbon, a molding binder, and calcium carbonate and is molded into a cylindrical shape, and the crushing strength of the cylindrical molded body is 6.33 N or more and 24.21 N or less. The filter for cigarettes of Claim 1.