CN105357992A - Filter for cigarette and cigarette with filter - Google Patents

Abstract

This filter for a cigarette is connected via a paper tip to one end of a rod portion formed by wrapping tobacco leaf in rolling paper, the filter for a cigarette being provided with: a pressing member having a main pressing body disposed so as to cover the cross-sectional surface of the filter, and a flow path formed to penetrate a portion of the main pressing body in the lengthwise direction of the filter, the flow path allowing the main flow of smoke to flow therethrough; a latter filter disposed at a stage after the pressing member, the latter filter filtering the components of the main flow of smoke; and a rotating mechanism that can rotate about an axis in the lengthwise direction of the filter with respect to the latter filter and the pressing member. The pressing member has the flow path formed therein such that the position of the flow path opposing the front end face of the latter filter is modified by the relative rotation of the latter filter and the pressing member.

Description

Cigarette filters and cigarettes with filters

technical field

The invention relates to a cigarette filter and a cigarette with a filter

Background technique

Conventionally, there is known a technique for disposing a throttling member such as an orifice or the like that reduces the cross-sectional area of the flow path of the mainstream smoke at the front end (upstream side) of the filter member for the purpose of changing the mainstream smoke component of the cigarette. The mainstream smoke with increased flow velocity flows into the filter part, and is filtered in a high flow velocity state of the mainstream smoke. This technique is described as "high-speed filtration" technique in this specification.

prior art literature

patent documents

Patent Document 1: (Japanese) Unexamined Patent Publication No. 8-205844

Contents of the invention

The problem to be solved by the invention

However, when the filter member performs high-speed filtration of mainstream smoke, clogging of the front end surface of the filter member tends to occur. As a result, the ventilation resistance of the filter member increases every puff, that is, every time the smoker inhales mainstream smoke, and the smoker may become difficult to smoke.

The present invention was made in view of the above-mentioned actual situation, and its object is to provide a filter for cigarettes and a cigarette with a filter, even in the case where a throttling member that restricts the cross-sectional area of the flow path of mainstream smoke is arranged at the front stage of the filter member. It is also possible to suppress an increase in the airflow resistance of the filter member per puff.

Technical solutions for solving problems

In the present invention, the following means are adopted in order to solve the above-mentioned problems. That is, according to the present invention, there is provided a filter for cigarettes which is connected to one end of a rod portion of shredded tobacco rolled up by wrapping paper via a tipping paper, and which has a throttle member having a cross-section to close the filter. The throttling part main body configured in the way of the filter tip and a part of the throttling part main body in the length direction of the filter to form and circulate the through passage of mainstream smoke; the rear filter part is arranged in the rear part of the throttling part and filters The smoke component of the mainstream smoke; the rotating mechanism can relatively rotate the rear filter part and the throttling part around the long axis of the filter. The through passage of the throttle member is formed so that the relative position of the through passage with respect to the front end surface of the rear filter member changes with the relative rotation of the rear filter member and the throttle member.

With the cigarette filter of the above structure, the mainstream smoke with increased flow velocity is introduced into the rear filter part when flowing through the through passage of the throttling part, and the high-speed filtration of the mainstream smoke is realized in the rear filter part. As a result, it is possible to change the mainstream smoke component of a cigarette to which the filter of the present invention is applied, and to obtain an effect of changing the characteristics of the cigarette flavor.

However, when the narrowed mainstream smoke of the flow path of the throttle member is introduced into the rear filter member, the particulate matter contained in the mainstream smoke concentrates on the front end surface of the rear filter member, so that the front end surface of the rear filter member becomes clogged. easy to generate. As a result, the ventilation resistance increases every time the smoker performs an action of inhaling mainstream smoke, that is, every puff.

In contrast, the filter of the present invention is configured to have a rotating mechanism for changing the relative position of the through passage with respect to the front end surface of the rear filter member by relatively rotating the rear filter member and the throttle member. In this way, as the smoking of the cigarette proceeds, the smoker can use the rotating mechanism to adjust the relative positional relationship between the rear filter part and the through passage at an appropriate time, so that no clogged areas and The through passage is opposite. As a result, it is possible to suppress an increase in airflow resistance of the rear-stage filter member. Therefore, it is possible to prevent the smoker from being difficult to inhale mainstream smoke when smoking.

In addition, the through passage may not be formed in a concentric circle centered on the central axis of the cross section in the cross section of the throttle body. By forming the through-path of the throttle member in this way, when the rear-stage filter member and the throttle member are relatively rotated, the relative position of the through-passage with respect to the front end surface of the rear-stage filter member can be appropriately changed.

In addition, the rotation mechanism may be configured to hold at least one of the rear filter member and the throttle member so as to be rotatable relative to the tipping paper. In this case, the rear filter member may be disposed at the rearmost end of the filter, and a grip portion for rotating the rear filter member may be formed to protrude rearward from the rear end of the tipping paper. In this way, the smoker can easily perform the turning operation of the rear filter member with respect to the tipping paper by pinching the grip portion of the rear filter member.

In addition, a mark indicating a relative rotational position of the rear filter member with respect to the tipping paper may be attached to the outer surface of the holding portion and the tipping paper. In this way, the smoker can easily grasp the current relative rotational position of the rear filter member with respect to the tip paper when performing the rotation operation of the rear filter member with respect to the tip paper. In addition, based on the relative positional relationship between the mark provided on the grip portion side and the mark provided on the tipping paper side, the smoker can intuitively understand the approximate amount of rotation when turning the rear filter member, thereby further improving the convenience of the filter. and can provide a filter with good operability for smokers.

In addition, the rear filter member and the tip paper may have a concavo-convex structure that fits every time the relative rotation angle of the rear filter member relative to the tip paper changes at a predetermined angle. In this way, when the smoker rotates the rear filter member, he can easily grasp that the relative rotation angle of the rear filter member relative to the tip paper has changed by a predetermined angle from the position before the operation based on the feeling transmitted by the grip portion. Thereby, the convenience of a filter can be further improved, and the filter with good operability for a smoker can be provided.

In addition, the rear end surface of the throttle member and the front end surface of the rear filter member may be connected along the longitudinal direction of the filter. Thereby, after the mainstream smoke passes through the through-passage of the throttle member, it can be guided to the rear-stage filter member while maintaining the flow velocity of the mainstream smoke at a high speed. As a result, high-speed filtration of mainstream smoke in the rear filter member can be better realized.

In addition, the joint paper is formed with a ventilation hole for introducing air for diluting mainstream smoke into the filter tip, and the ventilation hole may also be arranged in the front section of the joint paper corresponding to the through passage in the longitudinal direction of the filter tip. Location. In this way, the mainstream smoke which merges with the outside air introduced into the filter through the vent hole can be introduced into the through passage. As a result, the linear velocity of mainstream smoke flowing through the rear filter member can be easily maintained at high speed, contributing to high-speed filtration of mainstream smoke through the rear filter member.

In addition, a front filter member for filtering smoke components of mainstream smoke may be arranged at a front stage of the throttle member, and a hollow portion may be provided between the through passage and the front filter member. Thus, by providing the cavity between the through passage of the throttle member and the front filter member, the ventilation resistance of the mainstream smoke passing through the front filter member can be reduced. As a result, mainstream smoke can be smoothly introduced into the through passage of the throttle member. In addition, a gap can be formed between the rear end surface of the front filter member and the throttle body (through passage) by providing a hollow portion at the front end of the through passage, so it is difficult to clog the rear end surface of the front filter member. As a result, the reduction effect of the airflow resistance of the front filter member can be further expected, and the smooth introduction of the mainstream smoke into the through passage can be performed more reliably.

In addition, vent holes for introducing air for diluting mainstream smoke into the filter are formed on the tip paper, and the vent holes can also be arranged in the tip paper corresponding to the hollow portion or the filter tip in the length direction of the filter tip. The position of the front filter part.

In addition, the present invention can also be applied to cigarettes with filters. According to the present invention, there is provided a cigarette with a filter, which has a rod portion with shredded tobacco rolled up by rolling paper, and a filter connected to one end of the rod portion via a tipping paper, the filter having: a throttle member having a A throttling part main body configured in a cross-section of the filter and a through passage through which a part of the throttling part main body is penetrated in the longitudinal direction of the filter to form and circulate mainstream smoke; The rear section also filters the smoke components of the mainstream smoke; the rotating mechanism can relatively rotate the rear filter part and the throttle part with the long axis of the filter as the center, and the through passage of the throttle part is formed as follows: The relative rotation of the rear filter member and the throttle member changes the relative position of the through passage with respect to the front end surface of the rear filter member.

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

The effect of the invention

According to the present invention, there are provided a filter for cigarettes and a cigarette with a filter, which can suppress the ventilation of the filter part every time even if the throttle part that reduces the cross-sectional area of the flow path of mainstream smoke is arranged at the front stage of the filter part. resistance to rise.

Description of drawings

FIG. 1 is a diagram showing a schematic configuration of a cigarette according to an embodiment.

Fig. 2 is a cross-sectional view of a cigarette according to the embodiment.

Fig. 3 is a detailed configuration diagram of a throttle member according to the embodiment.

Fig. 4 is a front view of the throttle member according to the embodiment.

Fig. 5 is a diagram illustrating a turning mechanism of the embodiment.

Figure 6A is a diagram (1) illustrating the relative position of the front end surface of the rear stage filter part and the through passage

Figure 6B is a diagram (2) illustrating the relative position of the front end surface of the rear stage filter part and the through passage

Fig. 7A is a diagram (1) showing a modified example of the through passage of the throttle member.

Fig. 7B is a diagram (2) showing a modified example of the through passage of the throttle member.

Fig. 8 is a diagram illustrating a filter of a first modified example.

Fig. 9 is a diagram illustrating a filter of a second modified example.

Fig. 10 is a diagram illustrating a filter of a third modified example.

Fig. 11 is a schematic diagram of a cigarette of a comparative example.

FIG. 12 is a graph showing measurement results of ventilation resistance per puff in Examples and Comparative Examples.

detailed description

Here, an embodiment of a filter-tipped cigarette having the cigarette filter of the present invention will be described based on the drawings. In addition, unless otherwise specified, the dimensions, materials, shapes, and relative arrangements of the components described in the present embodiment do not limit the technical scope of the invention to these components.

Fig. 1 is a diagram showing a schematic configuration of a cigarette with filters (hereinafter simply referred to as "cigarette") 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing part of the cigarette 1 . FIG. 2 schematically shows a section including the longitudinal axis of the cigarette 1 (hereinafter referred to as "longitudinal section"). The cigarette 1 has a rod part 2 and a filter 4 connected to one end of the rod part 2 via a tipping paper (tipping paper sheet) 3 . The shredded tobacco rod 2 wraps the shredded tobacco 21 with a paper 22 and assumes a cylindrical shape (rod shape). The rod part 2 may also be called a "single coil part". FIG. 2 shows a cross section of the filter 4 as a center. In addition, the cross section in the direction perpendicular to the long axis of the cigarette 1 (stick part 2, filter 4) is called "transverse cross section" hereinafter.

The filter 4 is a member for filtering (filtering) smoke components contained in the mainstream smoke when the mainstream smoke generated when the cigarette 1 is smoked passes through. The filter 4 is formed into a cylindrical shape having substantially the same diameter as the stick portion 2 . Then, the rod portion 2 and the filter 4 are connected by the tipping paper as described above. Hereinafter, one end connected to the filter 4 in the stick portion 2 is referred to as a "rear end", and the opposite end is referred to as a "front end". In addition, the connection end of the filter 4 with the rod part 2 is called "the front end" of the filter 4, and the end part of the opposite side is called a "smoking mouth end" (rear end).

Inside the filter 4 , the front-stage filter member 41 , the throttle member 42 , the rear-stage filter member 43 , and the like are arranged in order from the front end side of the filter 4 . The front filter member 41 and the rear filter member 43 are filter members that filter smoke components contained in mainstream smoke flowing into the filter 4 from the stick portion 2 side during smoking. Based on the throttle member 42 , the front filter member 41 is provided at the front stage (upstream side) of the throttle member 42 , and the rear filter member 43 is provided at the rear stage (downstream side) of the throttle member 42 .

The front-stage filter member 41 and the rear-stage filter member 43 applied to the cigarette 1 are not limited to specific types, but for example, in this embodiment, the front-stage filter member 41 is formed as a charcoal filter, and the rear-stage filter member 43 is formed as a charcoal filter. Cellulose acetate filter to form. Here, the cellulose acetate filter is a filter segment in which a columnar cellulose acetate fiber bundle is wound up with a winding paper 430 . On the other hand, the charcoal filter is a filter segment that is formed by dispersing an adsorbent such as activated carbon in a fiber bundle of cellulose acetate and is wound up with a winding paper 410 . In addition to the function of filtering mainstream smoke, the front filter member 41 also has the function of suppressing the shredded tobacco 21 of the rod part 2 from being scattered on the side of the filter 4 .

Next, a detailed structure of the throttle member 42 will be described. FIG. 3 shows a detailed configuration diagram of the throttle member 42 according to the embodiment. The throttle member 42 has a throttle body 420 formed of a smoke-impermeable smoke-impermeable material, and a through passage 420A penetrating through a part of the lateral cross section of the throttle body 420 . In the present embodiment, the throttle member 42 is made of resin such as plastic, but if it is a smoke-impermeable material, metal, a material obtained by molding cellulose acetate fiber at high density, or other materials can be used. The throttle body 420 of the throttle member 42 is, as shown in FIG. 2 , a disc member having substantially the same diameter as the cross section of the filter 4 and arranged to close the cross section of the filter 4 . Furthermore, the through passage 420A of the throttle member 42 penetrates the throttle body 420 in the longitudinal direction of the filter 4 and extends along the long axis of the filter 4 . The through passage 420A of the throttling part main body 420 is a flow path for circulating the mainstream smoke, and reduces the cross-sectional area of the flow path of the mainstream smoke.

FIG. 4 is a front view of the throttle member 42 of the embodiment. Here, the center of the throttle body 420 is defined as the "central axis" of the throttle member 42, and is indicated by a symbol CA1 in the figure. The through passage 420A of the present embodiment is formed in a cross section of the throttle body 420 so as not to be concentric circles centered on the central axis CA1 of the throttle body 420 . In the example shown in FIG. 4 , the through-passage 420A is a through-hole having a circular cross section that is disposed centrifugally with respect to the central axis CA1 of the throttle body 420 . That is, if the central axis of the through-passage 420A is indicated by the symbol CA2, the central axis CA2 of the through-passage 420A is centrifugal from the central axis CA1 of the throttle body 420, and the center axis CA1 of the throttle body 420 is not formed. concentric circles.

The throttle member 42 of this embodiment is arrange|positioned in the filter 4 so that the central axis CA1 and the major axis of the filter 4 may be coaxial. In this specification, the mainstream smoke flowing in from the stick part 2 is defined as "upstream" and "downstream" in the filter 4 based on the direction in which it flows in the filter 4 . That is, the “smoking mouth end” of the above-mentioned filter 4 corresponds to the downstream end of the filter 4 , and the “front end” of the filter 4 corresponds to the upstream end of the filter 4 .

In addition, the throttle body 420 of the throttle member 42 is arranged to face the front end surface of the rear-stage filter member 43 . More specifically, the rear end surface of the throttle body 420 of the throttle member 42 is connected to the front end surface of the rear filter member 43 along the longitudinal direction of the filter 4 . Accordingly, the rear filter member 43 is arranged continuously with the throttle body 420 so that no gap is formed between the front end surface of the rear filter member 43 and the rear end surface of the throttle body 420 .

On the other hand, a cavity (cavity) 44 is provided between the front end surface of the throttle body 420 of the throttle member 42 and the rear end surface of the front filter member 41 . That is, the front-stage filter member 41 and the throttle member 42 of the filter 4 are arranged in a state separated in the longitudinal direction of the filter 4 with the hollow portion 44 interposed therebetween. In addition, since the through-passage 420A is provided in the throttle body 420 , the cavity 44 is provided in the front stage (upstream side) of the through-passage 420A. In addition, the front-stage filter member 41 and the throttle member 42 are wound up by a common winding paper 46 to be integrated. The winding paper 46 has air permeability.

In addition, vent holes 31 for introducing external air (air) into the filter 4 are provided through the area of the tipping paper 3 covering the periphery of the filter 4, and the external air (air) is used for diluting mainstream smoke. The ventilation holes 31 are so-called external air introduction holes for ventilation, and a plurality of them are provided in the tip paper 3 . The ventilation hole 31 of the tip paper 3 is provided at a position corresponding to the front stage of the through passage 420A of the throttle portion 42 in the longitudinal direction of the filter 4 . That is, the vent hole 31 is formed on the upstream side relative to the through passage 420A of the throttle member 42 in the tip paper 3 . More specifically, the ventilation holes 31 of the tipping paper 3 are provided at positions corresponding to the hollow portions 44 in the longitudinal direction of the filter 4 . In addition, as mentioned above, the wrapping paper 46 has air permeability, so the outside air from the ventilation holes 31 of the tipping paper 3 passes through the wrapping paper 46 and is introduced into the inside of the filter 4 .

The ventilation hole 31 may be opened at a predetermined position of the tip paper 3 before the tip wrap 3 wraps the stick portion 2 and the filter 4 . In addition, the vent holes 31 may be formed after the tipping paper 3 is wrapped around the stick part 2 and the filter 4 . The penetrating arrangement of the air hole 31 relative to the joint paper 3 can be done by methods such as laser, or by other methods. In addition, in this embodiment, although a plurality of vent holes 31 are arranged at regular intervals along the circumferential direction of the tip paper 3 , the pattern of arranging the vent holes 31 on the tip paper 3 is a design matter that can be changed as appropriate.

Next, the rotation mechanism 45 provided in the rear filter member 43 of the filter 4 is demonstrated. FIG. 5 is a diagram illustrating a turning mechanism 45 according to the embodiment. FIG. 5 shows centering on the rear-stage filter member 4 of the filter 4 . The rotation mechanism 45 of the present embodiment is a mechanism capable of relatively rotating the rear-stage filter member 43 and the throttle member 42 around the long axis of the filter 4 . More specifically, the rotation mechanism 45 is configured as a mechanism for holding at least one of the rear filter member 43 and the throttle member 42 relative to the tipping paper 3 in a circumferentially rotatable manner.

In the configuration example shown in FIG. 5 , the throttle member 42 is fixedly arranged in the filter 4 . Specifically, the outer peripheral surface of the throttle member 42 (throttle body 420 ), that is, the take-up paper 46 wound around the outer circumference of the throttle member 42 is adhered to the inner peripheral surface of the tip paper 3 with an adhesive. In FIG. 5 , the area where the adhesive is applied is indicated by a symbol BD with a bold line.

On the other hand, as can be seen from FIG. 5 , no adhesive is applied between the wrapping paper 430 and the tipping paper 3 forming the outer peripheral surface of the rear filter member 43 disposed at the rearmost end of the filter 4 . That is, the rear-stage filter member 43 is not adhered to the tipping paper 3 , but is slidably and rotatably held in the circumferential direction along the inner surface of the tipping paper 3 . In addition, as shown in the figure, in the tube formed by the tipping paper 3, where the rear filter member 43 is inserted, a part of the rear end thereof is held so as to protrude rearwardly from the rear end of the tipping paper 3. That is, the rear filter member 43 is rotatably held by the tipping paper 3 so that its rear end side protrudes from the tipping paper 3 to be exposed to the outside. Hereinafter, the portion exposed to the outside by protruding from the tipping paper 3 in the rear-stage filter member 43 is referred to as "grip portion 431". For example, the smoker can easily perform the turning operation of the rear filter member 43 by pinching the grip portion 431 of the rear filter member 43 .

In addition, the rotation mechanism 45 of the filter 4 is configured so as to prevent the rear-stage filter member 43 from being pulled out from the tipping paper 3 . More specifically, the rear end portion of the tipping paper 3 and the front end portion of the wrapping paper 430 of the rear filter member 43 are formed with pull-out preventing pieces 3A, 430A which engage with each other. As shown in the figure, the pull-out prevention protrusion 3A is disposed on the inner surface of the tip paper 3 , and the pull-out prevention tab 430A is disposed on the outer surface of the winding paper 430 . The pull-out prevention sheet 3A is formed in a ring shape and a belt shape along the circumferential direction of the inner surface of the tip paper 3 . For example, the pull-out preventing sheet 3A is formed by double-laminating the paper materials forming the tip paper 3 via the adhesive BD, but the present invention is not limited thereto. Likewise, the pull-out prevention tab 430A is formed in a ring shape and a belt shape along the circumferential direction of the outer surface of the winding paper 430 . For example, the pull-out preventing sheet 430A is formed by double-bonding the paper materials forming the winding paper 430 via the adhesive BD, but the present invention is not limited thereto.

As shown in FIG. 5 , the pull-out prevention protrusion 3A on the tipping paper 3 side and the pull-out prevention protrusion 430A on the rear filter member 43 (winding paper 430 ) side are engaged by being engaged with each other. Thereby, relative movement of the rear-stage filter member 43 in the longitudinal direction with respect to the filter 4 is suppressed, that is, pulling-out of the rear-stage filter member 43 is suppressed. At the same time, the rear filter member 43 is not bonded to the tipping paper 3, so the rear filter member 43 can be relatively freely rotated around the central axis (major axis) along the longitudinal direction of the filter 4. In other words, the rear filter member 43 can be freely slid along the inner surface of the tipping paper 3 .

Next, the detailed configuration of the through passage 420A of the throttle member 42 will be described. As described with reference to FIG. 4 , the through passage 420A is formed not to be a concentric circle centered on the central axis CA1 of the transverse cross section of the throttle member 42 (throttle body 420 ). By forming the passage 420A in this way, when the rear filter member 43 and the throttle member 42 are relatively rotated by the rotation mechanism 45 , the relative position of the through passage 420A with respect to the front end surface of the rear filter member 43 can be changed. That is, the through passage 420A of the throttle member 42 is formed so that the relative position of the through passage 420A with respect to the front end surface of the rear filter member 43 changes with the relative rotation of the rear filter member 43 and the throttle member 42 .

Next, the content of the operation of the filter 4 of the present embodiment and the effects achieved thereby will be described mainly with reference to FIG. 2 . When the smoker sucks the cigarette 1, the mainstream smoke flowing into the filter 4 from the rod 2 passes through the front filter part 41, the throttling part 42, and the rear filter part 43, and is sucked into the oral cavity from the suction port of the filter 4. The particulate matter contained in the mainstream smoke is trapped in the order of passing through the front filter member 41 and the rear filter member 43 in this order. At the same time, the external air is introduced into the filter tip 4 through the vent hole 31 opened on the joint paper 3, and merges with the mainstream smoke. Then, the mainstream smoke that merges with the external air introduced from the vent hole 31 passes through the through passage 420A of the throttling member 42, and its flow velocity is increased. Part of the function of the orifice.

Then, the high-speed mainstream smoke flowing out from the through passage 420A flows into the rear-stage filter member 43 . Here, since the cross-sectional area of the through passage 420A is smaller than the size of the cross-section of the rear-stage filter member 43 , mainstream smoke passes through a part of the cross-section of the rear-stage filter member 43 . Thus, by reducing the effective filtering area of the rear filter member 43, the linear velocity of the mainstream smoke flowing through the rear filter member 43 is maintained at a high speed. In this way, high-speed filtration of mainstream smoke by the rear-stage filter member 43 can be achieved, and filter characteristics can be changed. Then, by performing high-speed filtration by the rear-stage filter member 43 , it is possible to change the mainstream smoke component of the cigarette 1 and obtain an effect of changing the characteristics of the cigarette taste of the cigarette 1 .

However, when the mainstream smoke whose velocity is increased through the through passage 420A flows into the rear filter member 43 , the particulate matter contained in the mainstream smoke concentrates on the front end surface of the rear filter member 43 . Therefore, in the case of performing high-speed filtration of the rear-stage filter member 43, clogging of the front end surface of the rear-stage filter member 43 is likely to occur, and the ventilation resistance increases every time the smoker inhales mainstream smoke, that is, every time he puffs and puffs. main cause.

On the other hand, since the filter 4 of this embodiment has the rotation mechanism 45 which enables relative rotation of the rear-stage filter member 43 and the throttle member 42, the said defect can be eliminated. Next, the contents of the operation of the filter 4 using the rotating mechanism 45 will be described.

6A and 6B are diagrams illustrating the relative positions of the front end surface of the rear filter member 43 and the through passage 420A before and after the rear filter member 43 is rotated. 6A and 6B show the relative positional relationship of the through passage 420A of the throttle member 42 based on the front end surface (indicated by oblique hatching) of the rear filter member 43 .

For example, assuming that the smoker inhales mainstream smoke in the state shown in FIG. 6A , the cross section of the rear filter member 43 is clogged in the region facing the through passage 420A of the throttle member 42 . Even if the smoker wants to inhale the mainstream smoke in this state, it may be difficult to inhale the mainstream smoke due to the high ventilation resistance. On the other hand, since the filter 4 of this embodiment has the turning mechanism 45, the smoker can hold the grip part 431 of the rear filter member 43 and turn it.

As described above, the through passage 420A of the throttle member 42 is formed in a cross section of the throttle body 420 so as not to be a concentric circle centered on the central axis CA1 of the throttle body 420 . Therefore, by rotating the rear filter member 43 along the inner peripheral surface of the tipping paper 3, as shown in FIG. 6B, the relative position of the through passage 420A with respect to the front end surface of the rear filter member 43 can be changed. 6A and 6B illustrate an example in which the smoker sets the rotation angle (rotation operation amount) of the rear filter member 43 to 90°. In this way, the smoker can adjust the relative positional relationship between the rear filter member 43 and the through passage 420A by rotating the rear filter member 43 at any timing, so that no clogging occurs in the cross section of the rear filter member 43. The area is opposed to the through-path 420A. As a result, even if the number of times of puffing and puffing increases when smoking the cigarette 1, by performing the turning operation of the rear filter member 43 at an appropriate timing, it is possible to suppress the increase in the airflow resistance of the rear filter member 43 every puff and puff. This can prevent the smoker from becoming difficult to inhale mainstream smoke when smoking the cigarette 1 .

In addition, in this embodiment, the rear end surface of the throttle body 420 of the throttle member 42 and the front end surface of the rear filter member 43 are connected and arranged along the longitudinal direction of the filter 4, and the front end surface of the rear filter member 43 and the throttle No gap is provided between the rear end surfaces of the main body 420A. In this way, after the mainstream smoke passes through the through passage 420A of the throttle member 42 , it can be introduced into the rear-stage filter member 43 while maintaining the flow velocity of the mainstream smoke at a high speed. As a result, high-speed filtration of mainstream smoke by the rear-stage filter member 43 can be better achieved.

In addition, in the present embodiment, the vent hole 31 for introducing the outside air for ventilation into the filter 4 is arranged on the upstream side of the throttle body 420 of the throttle member 42 in the longitudinal direction of the filter 4 . . More specifically, the ventilation hole 31 of the tip paper 3 is provided at a position corresponding to the second hollow portion 44 in the longitudinal direction of the filter 4 . In this way, the mainstream smoke that merges with the outside air introduced into the filter 4 through the vent hole 31 can be introduced into the through passage 420A. As a result, the linear velocity of the mainstream smoke flowing sequentially through the through passage 420A and the rear filter member 43 is effectively maintained at a high speed, and contributes to high-speed filtration of the mainstream smoke by the rear filter member 43 . In addition, from the viewpoint of satisfactorily achieving high-speed filtration in the rear filter member 43, the vent holes 31 of the tipping paper 3 may be arranged on the upstream side of the throttle body 420 (through passage 420A) of the throttle member 42. . Therefore, for example, the vent hole 31 may be arranged at a position corresponding to the front-stage filter member 41 in the longitudinal direction of the filter 4 . In addition, in the present embodiment, from the viewpoint of better realizing the high-speed filtration of the rear-stage filter member 43, although the vent hole 31 of the tipping paper 3 is arranged at a lower position than the throttle body 420 (through hole 420A) of the throttle member 42, ) is located on the upstream side, but it does not prevent the opening of the vent hole 31 on the downstream side of the throttle member 42 in the tipping paper 3 . In addition, the ventilation hole 31 of the tipping paper 3 is not an essential structure of the filter 4 of this embodiment.

In addition, according to the filter 4 of this embodiment, the front stage of the through hole 420A of the throttle member 42, that is, the upstream side is provided with the hollow portion 44, and the front filter member 41 and the throttle body 420 are separated by the hollow portion 44. (through passage 420A) is arranged separately. In this way, first, the ventilation resistance of the filter 4 can be reduced. As a result, the ventilation resistance during smoking can be well adjusted. Also, secondly, since a gap can be formed between the rear end surface of the front filter member 41 and the throttle body 420 (through passage 420A), clogging hardly occurs on the rear end surface of the front filter member 41 . In this way, clogging of the front filter member 41 is less likely to occur, so that the effect of reducing the ventilation resistance of the front filter member 41 can be further expected, and smoother introduction of mainstream smoke into the through passage 420A can be ensured.

In addition, in the configuration examples up to the above, the rotating mechanism 45 has been described, and this rotating mechanism 45 is a mechanism for fixing the throttle member 42 to the wrapping paper 3 and holding the rear-stage filter member 43 so as to be relatively rotatable with respect to the wrapping paper 3. But it is not limited to this. Instead of the rear filter member 43 , the rotation mechanism 45 of the filter 4 may hold the throttle member 42 rotatably with respect to the tipping paper 3 . In addition, the rotation mechanism 45 may be configured to hold both the rear-stage filter member 43 and the throttle member 42 so as to be rotatable relative to the tipping paper 3 . These can also achieve the same effect as the rotation mechanism 45 described with reference to FIG. 5 .

In addition, in the turning mechanism 45 of this embodiment, a part of the rear-stage filter member 43 disposed at the rearmost end of the filter 4 is used as the grip part 431, and is formed to protrude rearward from the rear end of the tipping paper 3, so that the rear-stage rotation is easy to perform. Rotational operation of the filter member 43 . That is, operability when turning the turning mechanism 45 can be improved, and convenience can be improved.

In addition, in the filter 4 of the present embodiment, the through passage 420A of the throttle member 42 is formed in a cross section of the throttle body 420 so as not to be a concentric circle centered on the central axis CA1 of the throttle body 420 . Thus, by forming the through passage 420A non-concentric with respect to the central axis CA1 of the throttle body 420 , the rear filter member 43 and the throttle member 42 can be relatively freely rotated around the long axis of the filter 4 .

In addition, in the example shown in FIG. 4 , the through passage 420A of the throttle member 42 is formed as a circular through hole eccentric from the central axis CA1 of the throttle body 420 , but various modifications can be employed. That is, the through passage 420A of the throttle member 42 may be formed in a shape other than a concentric circle centered on the central axis CA1 of the throttle body 420, for example, as shown in FIGS. 7A and 7B , may be one or more. A through hole with a rectangular cross section.

Next, modifications of the filter 4 of the present embodiment will be described. In the filter 4A of the first modified example shown in FIG. 8 , a throttle member 42A is incorporated therein. The throttle member 42A is different from the throttle member 42 described above in that it has a cylindrical wall 421 erected from the throttle body 420 . The cylindrical wall 421 of the throttle member 42A is a circular sleeve (cylindrical wall) vertically erected from the throttle body 420 along the peripheral edge of the throttle body 420, and its outer diameter is substantially the same as the cross section of the filter 4. equal. In addition, the inner side of the cylindrical wall 421 is hollow. Hereinafter, the hollow space defined by the inner peripheral surface of the cylindrical wall 421 and the surface of the throttle body 420 is referred to as a "second cavity 422".

In addition, as shown in FIG. 8 , in the filter 4A, the cylindrical wall 421 is disposed on the upstream side of the throttle body 420 of the throttle member 42A. In addition, the throttle member 42A is arranged such that the front end surface of the cylindrical wall 421 is in contact with the rear end surface of the front filter member 41 . In addition, in this modified example, the ventilation hole 31 formed by the tipping paper 3 is provided at a position corresponding to the front-stage filter member 41 in the longitudinal direction of the filter 4 . In addition, the front-stage filter member 41 and the throttle member 42A are wound up by a winding paper 46 to be integrated. In the modified example configured as above, the second cavity 422 is also provided between the rear end surface of the front filter member 41 and the front end surface of the throttle body 420 , so that the airflow resistance of the filter 4 can be reduced. In addition, in this modified example, the throttle member 42A is arranged so that the front end surface of the cylindrical wall 421 is in contact with the rear end surface of the front filter member 41, but the front end surface of the cylindrical wall 421 and the front end surface of the front filter member 41 may also be arranged. back-face separation configuration. In addition, in this modified example, the winding paper 410 of the front filter member 41 and the winding paper 46 that winds the front filter member 41 and the throttle member 42A have air permeability. Thus, the outside air from the vent hole 31 passes through the wrapping paper 410 and the wrapping paper 46 and is introduced into the front filter member 41, and then flows through the front filter member 41, the second hollow portion 422, the through passage 420A, and the rear filter member in sequence. After part 43, it is guided into the oral cavity.

FIG. 9 is a diagram illustrating a filter 4B of a second modified example. In the filter 4B, the pointer 32 for position alignment is shown on the outer surface of the rear end of the tipping paper 3 . On the other hand, scales 432 are indicated on the outer surface (winding paper 430 ) of the gripping portion 431 of the rear-stage filter member 43 . The scale 432 includes marks such as a plurality of bars, but it is not limited to this form, and symbols such as letters, numerals, and symbols may also be included.

The pointer 32 of the tipping paper 3 and the scale 432 of the rear filter member 43 function as marks indicating the relative rotational position of the rear filter member 43 with respect to the tipping paper 3 . In this way, the smoker can easily grasp the relative rotational position of the rear filter member 43 relative to the wrapping paper 3 at the time of performing the rotation operation of the rear filter member 43 relative to the wrapping paper 3 . In addition, the smoker can intuitively understand the approximate amount of rotation when the rear-stage filter member 43 is rotated based on the distance between the scale lines constituting the scale 432 . Therefore, it is possible to provide a filter with high convenience and good operability for the smoker. In addition, in the example of FIG. 9 , although the pointer 32 is shown on the side of the tipping paper 3 and the scale 432 is shown on the side of the rear filter member 43 , the pointer and the mark may be arranged interchangeably.

In addition, FIG. 10 is a figure explaining the filter 4C of a 3rd modification. In the filter 4C, the outer peripheral surface (winding paper 430) of the rear-stage filter member 43 and the inner peripheral surface of the tipping paper 3 are formed so that each time the relative rotation angle of the rear-stage filter member 43 relative to the tipping paper 3 changes at a predetermined angle Combined concave-convex structure. Specifically, as shown in FIG. 10 , a plurality of recesses 433 are provided at regular intervals in the circumferential direction on the outer peripheral surface (winding paper 430 ) of the rear-stage filter member 43 . On the other hand, a plurality of protrusions 33 are provided at regular intervals along the circumferential direction of the inner peripheral surface of the tip paper 3 . The recesses 433 on the rear filter member 43 side and the protrusions 33 on the tipping paper 3 side are formed at the same position in the longitudinal direction of the filter 4, and the recesses 433 are alternately exchanged by rotating the rear filter member 43 relative to the tipping paper 3. A fitted state and a non-fitted state with the convex portion 33 .

For example, as shown in FIG. 10 , the protrusions 33 are provided at intervals of 45° along the circumferential direction of the tipping paper 3 , and the recesses 433 are provided at intervals of 45° along the circumferential direction of the rear filter member 43 . In such a filter 4C, when performing the turning operation of the rear-stage filter member 43, the relative rotation angle of the rear-stage filter member 43 relative to the tipping paper 3 is changed at a predetermined angle (45° in the example shown in FIG. 10 ) every time. ) changes, the convex portion 33 and the concave portion 433 fit together. In this way, when the smoker rotates the rear-stage filter member 43, based on the feeling transmitted through the grip part 431 (the feeling when the convex part 33 is fitted into the concave part 433, or the feeling when the fitted state is released), the smoker can easily It is clearly grasped that the relative rotation angle of the rear filter member 43 with respect to the tipping paper 3 has changed by a predetermined angle from the position before the operation. Thereby, it is possible to provide a filter with high convenience and good operability for the smoker. In addition, in the example shown in FIG. 10 , the example in which the convex portion 33 is provided on the inner peripheral surface of the tipping paper 3 and the concave portion 433 is provided on the outer peripheral surface of the rear-stage filter member 43 has been described, but the convex portion 33 and the concave portion 433 may also be combined. Exchange configuration. In addition, the distance between the convex parts 33 and the distance between the concave parts 433 can be freely changed.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

[Example]

In the examples, the cigarette 1 explained in FIGS. 1 to 5 was produced in the following manner. The front-stage filter member 41 is produced by winding up a material obtained by dispersing activated carbon in a cellulose acetate fiber bundle with a take-up paper 410 . In addition, the rear-stage filter member 43 is produced by winding up a fiber bundle of cellulose acetate with a winding paper 430 . Both the front-stage filter member 41 and the rear-stage filter member 43 have a diameter of 7.8 mm and a length of 10 mm.

The throttling member 42 is formed by providing a through passage 420A having a circular cross section so as to penetrate through a disc-shaped throttle body 420 made of plastic. The throttle body 420 has a thickness of 5 mm and a diameter of 7.8 mm. In addition, the diameter of the through passage 420A is 1.5 mm, and the centrifugal dimension between the center of the throttle body 420 and the center of the through passage 420A is 1.75 mm.

The rod portion 2 in which the shredded tobacco 21 is wound with the rolling paper 22 and the tipping paper 3 in which the air hole 31 is formed in advance are prepared. Then, arrange the part where the front filter member 41 and the throttle member 42 are rolled integrally with the winding paper 46, the rod part 2, and the rear filter member 43, and roll these integrally with the tipping paper 3 to make a cigarette. 1. In addition, the rod portion 2 is produced by wrapping shredded tobacco 21 with a wrapping paper 22 . The wrapping paper 46 uses a material having an air permeability of 1300 to 20000 CORES unit.

When the front filter member 41 and the throttle member 42 are rolled up with the roll-up paper 46, the front end surface of the throttle member 42 is arranged at a distance of 2mm from the rear end surface of the front filter member 41, and the front filter member 41 and the throttle member 42 to form a hollow portion 44 . In addition, the rear end surface of the throttle member 42 and the front end surface of the rear-stage filter member 43 are placed in contact with each other. In addition, the tipping paper 3 is bonded to the inner peripheral surface of the tipping paper 3 with the wrapping paper and the wrapping paper 46 of the stick portion 2, and the wrapping paper 430 of the rear stage filter member 43 is not bonded to the inner peripheral surface of the tipping paper 3. Winding on the inner peripheral surface. As a result, the filter 4 holding the rear filter member 43 so as to be relatively rotatable along the inner peripheral surface of the tipping paper 3 and the cigarette 1 including the filter 4 are obtained. In addition, in the manufactured cigarette 1, the length of the rod part 2 was 57 mm, and the length of the filter 4 was 27 mm.

The ventilation resistance per puff was measured for the cigarette 1 of the example manufactured in the above manner. The measurement results are shown in FIG. 12 . In the test, the cigarette 1 of the example was burnt in a smoker, and the airflow resistance of the filter 4 was measured after the rod portion 2 was cut off. In addition, the smoking device used in the smoking test was "RGA-SystemR26" (manufactured by Burghart). At the same time, the cigarette 1 of the embodiment was placed in a smoking device, and smoked according to the standard smoking conditions of the International Organization for Standardization (ISO). ISO's standard smoking conditions state that a puff is taken every 60 seconds (one puff). More specifically, two seconds of puffing of 35 ml was prescribed per puff, with an interval of 58 seconds between the end of each puff and the start of the next puff.

The ventilation resistance measuring device used for the measurement of ventilation resistance was "Model TT-300" (manufactured by Tamaki Seisakusho). When measuring the ventilation resistance, in order to eliminate the influence of the ventilation resistance of shredded tobacco, the rod portion 2 was cut off to measure the ventilation resistance of the filter 4 (the front filter part 41, the throttle part 42, and the rear filter part 43). In addition, the measurement of the ventilation resistance of the filter 4 was performed in the state which closed the ventilation hole 31 of the filter 4 using the cellophane tape (Sclerotte (registered trademark)) commercially available. In the smoking test, six cigarettes 1 for the test were prepared, and the ventilation resistance of the filter 4 at the number of puffs 0 to 5 was measured. Then, each time the cigarette 1 was puffed and puffed, the smoking test was performed by rotating the rear-stage filter member 43 relative to the tipping paper 3 in units of 60° in the circumferential direction of the filter 4 . That is, the ventilation resistance at the time of several puffs is obtained by cutting out the rod portion 2 of the cigarette 1 in a non-smoking state, and measuring the ventilation resistance of the filter 4 with a ventilation resistance measuring device. In addition, the airflow resistance at the time of one puff is obtained by measuring the airflow resistance of the filter 4 after one puff is performed using a smoker, and the stick portion 2 is cut off. Next, the ventilation resistance of puffing and puffing is performed for the first time with a smoker, and the rear filter part 43 is rotated by 60°, and then the second puff is performed with a smoker again, and then the rod part 2 is cut. Next, measure the ventilation resistance of the filter 4 to obtain. In this procedure, the ventilation resistance per puff was measured when the number of puffs was 0 to 5.

[comparative example]

FIG. 11 is a schematic diagram of a cigarette 100 of a comparative example. The cigarette 100 of the comparative example is different from the cigarette 1 of the embodiment, the through passage of the throttle member, and the fixing conditions of the rear filter member to the tip paper are different, and the other conditions are the same. In the cigarette 100 of the comparative example, reference numeral 42' in Fig. 11 is "throttle member", 420' is "throttle body", and 420A' is "through passage". The throttle member 42' is formed by penetrating through a disc-shaped plastic throttle body 420' through a through passage 420A' having a circular cross section. The throttle body 420' has a thickness of 5 mm and a diameter of 7.8 mm. In addition, the diameter of the through passage 420A' is 1.5 mm, and the center of the throttle body 420' and the center of the through passage 420A are arranged coaxially.

In the cigarette 100 of the comparative example, the same rod portion 2 and tipping paper 3 as those of the cigarette 1 of the example were prepared. Next, arrange the portion where the front filter member 41 and the throttle member 42' are rolled integrally with the wrapping paper 46, the rod portion 2, and the rear filter member 43, and roll these integrally with the tipping paper 3 to produce a cigarette. 1. In addition, the winding paper 46 which integrally winds the front filter member 41 and the throttle member 42' is made of a material having air permeability of 1,300 to 20,000 International Tobacco Research Cooperation Center units. When the front filter member 41 and the throttling member 42' are integrally rolled up by the roll-up paper 46, the front end face of the throttling member 42' is arranged at a distance of 2 mm from the rear end face of the front filter member 41, and the front filter member 41 and A cavity 44 is formed between the throttle members 42'. In addition, the rear end surface of the throttle member 42' and the front end surface of the rear-stage filter member 43 are placed in contact with each other. In addition, in the tipping paper 3, the wrapping paper of the stick part 2, the wrapping paper 46 integrally winding the front filter member 41 and the throttle member 42', and the outer circumference of the wrapping paper of the rear filter member 43 are bonded together with an adhesive. surface, stick to the inner surface of the tipping paper 3 and take it up. In addition, in the manufactured cigarette 100, the length of the rod part 2 was 57 mm, and the length of the filter 400 was 27 mm.

The ventilation resistance per puff was measured for the comparative cigarette 100 produced in the above manner. The measurement results are shown in Fig. 12 . In addition, in the smoking test of the cigarette 100 of the comparative example, the conditions of the smoking test of the examples were the same except that the rotation operation of the rear-stage filter member 43 was not performed for each puff.

As shown in FIG. 12 , for the cigarette 100 of the comparative example, the ventilation resistance increased as puffing progressed (the number of puffs increased), and compared to the initial resistance of 130 mmH ₂ O, it rose to 390 mmH ₂ O after the fifth puff. That is, it is found that the cigarette 100 of the comparative example becomes difficult for the smoker to inhale mainstream smoke as the number of puffs increases. On the other hand, as a result of the cigarette 1 of the example, even as the number of puffs increased, the ventilation resistance changed steadily from the initial resistance of 130 mmH ₂ O with little change. Therefore, it is known that in the cigarette 1 of the embodiment, by relatively rotating the rear-stage filter member 43 and the throttle member 42 around the long axis of the filter 4, both are aligned so that the through passage 420A of the throttle member 42 As opposed to the portion in the cross section of the rear filter member 43 that does not become clogged, it is possible to suppress an excessive increase in ventilation resistance during smoking. This result shows that the cigarette 1 of the example can provide a cigarette that is easy for the smoker to smoke to the end.

The embodiments suitable for the present invention have been described above, but it is obvious to those skilled in the art that various modifications, improvements, combinations, etc. can be made to the cigarette filter and the cigarette with filter of the present invention.

Explanation of reference signs

1 cigarette

2 rods

3 joint paper

4 filters

21 shredded tobacco

22 rolls

31 Vents

41 front filter

42 throttling parts

43 rear filter

44 cavity

420 throttling part main body

420A through road

Claims (11)

1. A filter tip for cigarettes, which is connected to one end of a rod portion that rolls shredded tobacco with wrapping paper via a tipping paper, characterized in that, The cigarette filter has: The throttling part has a throttling part main body configured to block the cross-section of the filter tip and a through passage formed through a part of the throttling part main body in the length direction of the filter tip and through which mainstream smoke flows; The rear filter part is arranged in the rear part of the throttling part and filters the smoke component of the mainstream smoke; a rotating mechanism capable of relatively rotating the rear filter part and the throttling part around the long axis of the filter, The through passage of the throttle member is formed such that a relative position of the through passage with respect to a front end surface of the rear filter member changes with relative rotation of the rear filter member and the throttle member. 2. The cigarette filter according to claim 1, wherein: The through passage is formed in a cross-section of the throttle body in a cross-section that does not become concentric circles centered on the central axis of the cross-section. 3. The cigarette filter according to claim 1 or 2, wherein: The rotation mechanism is configured to hold at least one of the rear filter member and the throttle member rotatably relative to the tipping paper. 4. The cigarette filter according to claim 3, wherein: The rear filter member is disposed at the rearmost end of the filter, and a grip portion for rotating the rear filter member is formed to protrude rearward from the rear end of the tipping paper. 5. The cigarette filter according to claim 4, wherein: A mark indicating a relative rotational position of the rear filter member with respect to the tipping paper is attached to the outer surface of the holding portion and the tipping paper. 6. The cigarette filter according to claim 4 or 5, wherein: The rear filter member and the tipping paper have a concavo-convex structure that fits each time a relative rotation angle of the rear filter member with respect to the tipping paper changes at a predetermined angle. 7. The cigarette filter according to any one of claims 1 to 6, wherein The rear end surface of the throttling member is connected to the front end surface of the rear filter member along the length direction of the filter. 8. The cigarette filter according to any one of claims 1 to 7, wherein The joint paper is formed with ventilation holes for introducing air for diluting mainstream smoke into the filter tip, The vent hole is provided in the tip paper at a position corresponding to a front portion of the through passage in the longitudinal direction of the filter. 9. The cigarette filter according to any one of claims 1 to 8, wherein A front filter member for filtering smoke components of mainstream smoke is arranged at a front stage of the throttle member, and a hollow portion is provided between the through passage and the front filter member. 10. The cigarette filter according to claim 9, wherein: The joint paper is formed with ventilation holes for introducing air for diluting mainstream smoke into the filter tip, The ventilation hole is provided in the tipping paper at a position corresponding to the hollow part or the front filter part in the longitudinal direction of the filter. 11. A cigarette with a filter, characterized in that: Said cigarette with a filter, having: The rod part where the shredded tobacco is rolled up with rolling paper; a filter connected to one end of the stick via a joint paper, The filter tip has: The throttling part has a throttling part main body configured to block the cross-section of the filter tip and a through passage formed through a part of the throttling part main body in the length direction of the filter tip and through which mainstream smoke flows; The rear filter part is arranged in the rear part of the throttling part and filters the smoke component of the mainstream smoke; a rotating mechanism capable of relatively rotating the rear filter part and the throttling part around the long axis of the filter, The through passage of the throttle member is formed such that a relative position of the through passage with respect to a front end surface of the rear filter member changes with relative rotation of the rear filter member and the throttle member.