RU2720966C1 - Smoking product with filter - Google Patents

Abstract

FIELD: smoking accessories.

SUBSTANCE: invention relates to a smoking article with a filter, which contains: an aerosol-generating element; a filter comprising a filter material and one or more filter wrappers wrapped around an outer peripheral surface of the filter material; and an outer wrapper wrapped around the outer peripheral surfaces of the end portion of the aerosol-generating member and the filter, wherein the outer peripheral surface of the outer wrapper has an arithmetic roughness of less than 2.0 mcm and filter, which is wrapped with outer wrapper, has reduction at compression of 60 % or more after application of compression load of 2.5 N to length range of 10 mm in direction of its diameter.

EFFECT: technical result is to ensure restoration of filter shape.

17 cl, 5 dwg, 1 tbl

Description

Technical field

The present invention relates to a smoking article with a filter.

State of the art

A smoking article with a filter, for example a filter cigarette, is formed by manufacturing a cigarette rod adjacent to the filter, wrapped on the outer peripheral surface of the filter and the outer peripheral surface of the cigarette rod near the abutment portion with an outer wrapper connecting the cigarette and the filter.

In a smoking article with a filter, the filter wrapped in the outer wrapper functions as a mouthpiece that the user holds in his mouth while smoking. The user's impression of a smoking product with a filter depends on the physical properties of the mouthpiece section, which gives the user a different smoking experience.

Patent Document 1 proposes a filter for a smoking article with a stiffness of some or higher level on the mouth side, so that the user can enjoy chewing the end on the mouth side of the filter of the smoking article while smoking.

List of links

Patent Literature

Patent Document 1: JP 2016-523565 A1

SUMMARY OF THE INVENTION

Technical problem

However, in Patent Document 1, emphasis is placed on the action of the user who enjoys nibbling the filter, and the sensation (maintaining comfort in the mouth of the user) is not evaluated when the user holds the mouthpiece end with his lips while smoking.

The aim of the present invention is to provide a smoking article with a filter with a pleasant feeling (maintaining comfort in the mouth of the user) when the user holds the mouthpiece area with his lips while smoking.

Solution to the problem

The present invention provides a smoking article with a filter comprising an aerosol generating element; the filter comprises filter material and one or more filter wrappers wrapped around the outer peripheral surface of the filter material; and the outer wrapper is wrapped around the outer peripheral surface of the end portion of the aerosol generating element and the filter, the outer peripheral surface of the outer wrapper having an arithmetic average roughness of less than 2.0 μm, and the filter wrapped in the outer wrapper has a compression recovery of 60% or more after applying a load to 2.5 N compression to a length range of 10 mm in the direction of its diameter.

Preferred Results of the Invention

The present invention provides a smoking article with a filter with a pleasant feeling (maintaining the sensation in the mouth of the user) when the user holds the mouthpiece with his lips while smoking.

Brief Description of the Drawings

In FIG. 1 is a schematic graph of a curve of the recovery force in compression versus the amount of deformation in compression for calculating the recovery in compression.

In FIG. 2 is a diagram illustrating the determination of stiffness.

In FIG. 3 is a schematic cross-sectional view of a smoking article with a filter according to the first embodiment.

In FIG. 4 is a schematic cross-sectional view of a smoking article with a filter according to a third embodiment.

In FIG. 5 schematically shows a method for measuring recovery in compression.

Detailed description

The following describes in detail a smoking article with a filter of the present invention.

The smoking filter article of the present invention comprises an aerosol generating element, a filter containing filter material, and one or more filter wrappers wrapped around the outer peripheral surface of the filter material, and an outer wrapper wrapped around the outer peripheral surfaces of the end portion of the aerosol generating element and filter. The outer peripheral surface of the outer wrapper has an arithmetic average roughness of less than 2.0 μm, and the filter wrapped in the outer wrapper has a compression recovery of 60% or more after applying a compression load of 2.5 N to a length range of 10 mm in the direction of its diameter.

In a smoking article with a filter, the filter wrapped in the outer wrapper is a mouthpiece portion that the user holds in his mouth while smoking. In addition, the outer peripheral surface of the outer wrapper is the outer peripheral surface of the mouthpiece portion to which the user's lips touch when smoking. It has been found that a smoking article with a filter of the present invention has a particularly pleasant sensation (maintaining comfort in the user's mouth) when the user holds the mouthpiece with his lips while smoking.

In addition, it was found that to further improve the comfort of the mouth of the user of the smoking article with the filter, the arithmetic average roughness of the outer peripheral surface of the outer wrapper is preferably 1.5 μm or less and, more preferably, 1.0 μm or less.

In the present invention, it was found that in order to further improve comfort in the mouth of a user of a smoking article with a filter, the filter wrapped in the outer wrapper should have a 60% or more compression recovery after applying a compression load of 2.5 N to a length range of 10 mm in the direction thereof diameter.

Since the arithmetic mean roughness of the outer peripheral surface of the outer wrapper is lower, the lips of the user get a feeling of smoother when the user holds the mouthpiece with his lips while smoking. If the compression restoration of the mouthpiece portion is acceptable, the user's lips feel the preferred pressure when the user holds the mouthpiece lips with his lips while smoking. If the recovery in compression is high, it is preferable since the shape of the mouthpiece section can be restored to a state before compression after the user holds and compresses the mouthpiece with his lips while smoking. In contrast, if the compression compression of the mouthpiece portion is acceptable, but the arithmetic mean roughness of the outer wrapper is high, holding comfort is not possible due to the sensation of a rough surface by the user's lips.

In addition, it was found that to further improve the comfort of the mouth of the user of the smoking article with the filter, the angle of recovery after folding the outer wrapper or one or more filter wrappers is preferably 60 degrees or more, more preferably 100 degrees or more, and most preferably 100 degrees or more and 120 degrees or less. If the angle of recovery after bending the outer wrapper or one or more filter wrappers is large, the user's lips feel stiff and give him a feeling of reliable comfort in the user's mouth when the user holds the mouthpiece with his lips while smoking. Basically, when the recovery angle after bending the outer wrapper or one or more filter wrappers is large, the compression recovery of the filter wrapped by the outer wrapper is improved.

In addition, it has been found that to further improve the comfort of the mouth of a user of a filter smoking article, the stiffness of the filter wrapped by the overwrap is preferably less than 90%, more preferably 80% or more and less than 90%, and even more preferably 85% or more and less than 90%. It was found that maintaining comfort in the mouth of a user of a smoking article with a filter is preferable when the stiffness of the mouthpiece portion is not too high.

The definitions of the above terms “arithmetic roughness”, “recovery under compression”, “angle of recovery after bending” and “stiffness” will be given below.

<Arithmetic average roughness>

The term "arithmetic roughness" as used herein refers to arithmetic roughness (Ra) as measured by a surface roughness meter under measurement conditions in accordance with ISO1997.

<Compression Recovery>

The term "compression recovery", as used herein, refers to a recovery property for compression. Compression recovery is calculated from the curve of the recovery force versus the amount of compression deformation obtained when the test sample, which is a filter wrapped in an outer wrap, is compressed to a compression load of 2.5 N to a range of lengths of 10 mm in the direction of its diameter, by using a cylindrical piston with a diameter of 10 mm, the compression operation is stopped, and the shape of the test sample is restored. The amount of deformation under compression is the amount of deformation [mm] of the diameter of the test specimen compressed by the compressive load. The curve of the restoring force as a function of the amount of compressive strain is measured using, for example, a viscometer. In FIG. Figure 1 is a schematic graph showing the recovery force curve as a function of the compression strain obtained by compressing the test specimen in the diameter direction with a compression load of 2.5 N at a set speed (curve A – B), stopping the compression operation, and plotting the recovery force under compression [N] (curve B – C) versus the amount of deformation under compression [mm], when the shape is restored until the restoring force from the test sample reaches 0 N.

On the curve of the dependence of the restoring force on the strain in compression, the work (area of the ABD region) during compression (curve A – B) and the work (area of the region CBD) during recovery (curve B – C) are calculated. Compression recovery [%] is calculated using the following equation.

Compression Recovery [%] = (CBD Area Area) / (ABD Area Area) × 100 [%]

The compression load was set equal to 2.5 N for the reason that the average value of the strength of the user holding the mouthpiece area with lips when smoking corresponds to a compression load of 2.5 N for a range of lengths of 10 mm. Compression recovery becomes higher as the amount of deformation during compression of the test sample after stopping the compression operation (TC mm) approaches the value of deformation before compression (0 mm). In addition, the recovery under compression becomes higher as the restoring force under compression [N] for the compressive strain [mm] upon pressure (curve A – B) and upon recovery after stopping the compression operation (curve B – C) are close.

<Angle of recovery after bending>

The term "angle of recovery after bending", as used herein, refers to the restoring force to return to the original planar shape of the sheet. The angle of recovery after folding refers to the angle of folding back of the sheet after folding back some sheet at an angle of 180 degrees with constant pressure and holding motionless for 30 seconds.

<Rigidity>

The term "stiffness" as used herein refers to compressive strength. Stiffness is measured by applying a 2 kg load to the filter wrapped with ten outer wrappers for 20 seconds, and measuring the average diameter of the recess in the filter wrapped by the outer wrapper. In FIG. 2 shows a filter 101 wrapped in an outer wrapper before loading, and a filter 102 wrapped in an outer wrapper during application of the load. The stiffness is calculated from the diameter Ds before applying the load F and the diameter Dd of the notch when the load F is applied, according to the following equation.

Hardness (%) = Dd / Ds × 100 (%)

These tests can be carried out using a Borgwaldt Corporation type DD60A density measuring device. These tests are called the DD60A – test and are carried out according to the standard test method for this device. These tests are carried out at an ambient temperature of 22 ± 2 degrees Celsius.

Some embodiments will be described with reference to the accompanying drawings. The same designations refer to the same elements for all embodiments, and a duplicate description will be omitted. In addition, each drawing is a schematic view conducive to understanding the embodiments, and the shape, size, ratio, etc. often differ from actual values. As used herein, the terms “upstream” and “downstream” are used appropriately based on the direction of aerosol flow when smoking a smoking article with a filter.

(First Embodiment)

In FIG. 3 is a schematic enlarged sectional view of a portion of a smoking article 1 with a filter according to the first embodiment. The following describes a cigarette with a filter as an example of a smoking article 1 with a filter, but a smoking article with a filter is not limited to this example. The smoking article 1 with the filter may be another smoking article to which the filter is attached, for example, a cigar, cigarillo, a non-combustible smoking article using electrical heating / heat of a chemical reaction, a smoking article without heating, etc.

The smoking article 1 with a filter comprises an aerosol generating element 11, a filter 12 and an outer wrap 13. The aerosol generating element 11 is, for example, a cigarette rod 11. Cigarette rod 11 comprises a cut tobacco 111 and cigarette paper 112 wrapped around a cut tobacco 111 similar to a regular cigarette . Cigarette paper 112 is, for example, air permeable paper.

The filter 12 is located at the end upstream of the smoke relative to the cigarette rod 11. The filter 12 has the same or substantially the same diameter as the cigarette rod 11. The filter 12 consists of filter material 121 and a filter wrapper 122 wrapped around the filter material 121. Filter 12 has a monofilter structure consisting of one filter material.

The outer wrapper 13 is wrapped around the end portion downstream of the smoke of the cigarette rod 11 and the outer peripheral surface of the filter 12 to connect the cigarette rod 11 and the filter 12. The outer wrapper 13 is glued to the cigarette rod 11 and the filter 12 with conventional adhesive used in the manufacture of conventional smoking articles with filter.

The compression recovery of the filter 12 wrapped by the outer wrap 13 after applying a compression load of 2.5 N is 60% or more, preferably 60% or more and less than 80%, and more preferably 60% or more and less than 70%. The compression recovery of the filter 12 wrapped by the outer wrapper 13 is completely determined by the material, the thickness and the bulk of the outer wrapper 13 and the filter wrapper 122, filter material 121 and the like. Preferably, the compression recovery of the mouthpiece portion of the composite filter 12 wrapped in the outer wrapper 13 is provided with the physical properties of the outer wrapper 13.

(a) Outer wrap (13)

The outer peripheral surface of the outer wrapper 13 has an arithmetic average roughness of less than 2.0 microns, preferably 1.5 microns or less, and more preferably 1.0 microns or less when it is wrapped around the filter. The angle of recovery after folding of the outer wrapper 13 is preferably 60 degrees or more, more preferably 100 degrees or more, and even more preferably 100 degrees or more and 120 degrees or less.

The outer wrapper 13 is not particularly limited since it is intended to correspond to the arithmetic average roughness indicated above, to recover under compression, and preferably to the angle of recovery after bending. The outer wrapper 13 consists, for example, of a sheet containing several layers. A sheet comprising several layers includes, for example, a base layer and a surface layer provided on one side or both sides of the base layer.

The base layer is not particularly limited, but is preferably formed from a material with a high recovery angle after bending, for example, a resin-based film. The resin-based film is preferably a resin-based thermoplastic film, for example, a polyethylene resin, a polyolefin resin, such as polypropylene, a polyamide resin, such as a nylon-6 resin, a polyester, such as polyethylene terephthalate, a polystyrene resin and polycarbonate or polyphenyl sulfide, or a film containing their mixture. In particular, the base layer is preferably a film of a polyethylene resin, a polyolefin resin, such as polypropylene, or a polyester resin, and more preferably a film containing a polyester or polyolefin as a main component. Preferably, the base layer has a film elongated along two axes to increase rigidity and strength and increase the angle of recovery after bending. The base layer may contain an inorganic filler, such as calcium carbonate, calcined clay, alumina or titanium dioxide, or an organic filler. The base layer may have a single layer structure or a multilayer structure.

The surface layer is not particularly limited since the outer peripheral surface of the outer wrapper 13 has an arithmetic average roughness of 2.0 μm or less and, for example, a coating layer containing an inorganic filler, a paper-like layer formed from a resin, or a coating layer containing a cellulosic nanofiber, referred to as the surface layer.

The coating layer containing the inorganic filler is, for example, a coating layer of a white titanium dioxide pigment similar to that of a plain glossy paper. A coating layer containing an inorganic filler may include, for example, a water-based binder resin, an inorganic filler, and a water-soluble polymer, and may contain a colorant. Examples of the inorganic filler include calcium carbonate, satin, silica, titanium oxide, alumina, zinc oxide, iron oxide, clay, aluminum sulfate and the like, and in particular fillers such as calcium carbonate and pigments such as titanium oxide, oxide zinc and iron oxide are preferred as an inorganic filler. To reduce the arithmetic roughness of the surface layer, the particle size of the inorganic filler is preferably 15 μm or less. By providing a surface layer containing an inorganic filler, effects such as improving printability, improving the ability to write with a pencil, improving the degree of whiteness, staining, contributing to opacity and improving surface smoothness can be achieved.

The paper-like layer formed from the resin is, for example, a resin film with a large number of microcavities, stretched and oriented only in the direction of one axis. The paper-like layer formed from the resin may contain the above-mentioned inorganic filler. The paper-like layer formed from the resin allows to achieve effects such as improved printability, improved pencil recording, improved whiteness, coloration, contribution to opacity and improved surface smoothness due to the large number of microcavities.

The coating layer containing cellulosic nanofiber is, for example, a coating layer containing cellulosic nanofiber with an average thickness of 50 nm or less and an average fiber length of 10 μm or more. A coating layer containing cellulosic nanofiber can be made by distributing the cellulosic nanofiber in an appropriate solvent (e.g., water or alcohol) to prepare a suspension, coating the suspension in the form of a coating on the base layer and drying the suspension.

It is preferable that when the outer wrapper 13 has a surface layer, the polymer material is not allowed to feel when the user holds the mouthpiece portion with his lips while smoking, if the base layer is a resin film. In addition, since the outer wrapper 13 mainly comprises a printed logo marking, pattern or the like to enhance the appearance, the outer wrapper preferably has a surface layer with a printability property.

Outer wrap 13 is preferably made of synthetic paper with a base layer that is a resin film, a coating layer containing an inorganic filler, or a surface layer of a layer similar to resin-formed paper. In general, synthetic paper with a coating layer containing an inorganic filler is referred to as synthetic paper for a surface coating method, for example, Peach Coat (registered trademark) (WER – 135DS, WEFY – 120, or SEY – 130FPP) (Nisshinbo Paper Products Co., Ltd.). Basically, synthetic paper with a paper-like layer formed from a resin film is referred to as synthetic paper of the domestic paper industry, for example, Yupotrace (registered trademark), New Yupo (trade name), Ultra Yupo (registered trademark) (Yupo Corporation) and the like.

The bulk of the outer wrapper 13 is preferably 50 g / m2 or more and less than 200 g / m2, more preferably 100 g / m2 or more and less than 200 g / m2 to achieve appropriate compression recovery in the mouth piece. If the bulk of the outer wrapper 13 is large, this is preferable since the angle of recovery after bending the outer wrapper 13 is also substantially improved.

The thickness of the outer wrapper 13 is preferably 50 microns or more and less than 150 microns and more preferably 100 microns or more and less than 150 microns to achieve appropriate compression recovery in the mouthpiece portion. If the outer wrap 13 is thick, it is preferable that, in general, the angle of recovery after folding is improved.

(b) Filter media (121)

The filter material 121 may be formed from a conventional filter material 121 and, for example, from cellulose acetate fiber. The physical properties of the filter material 121 affect the compression recovery of the mouthpiece portion.

In addition to the filter material 121, a plasticizer may be added. The plasticizer is not particularly limited since it is intended to plasticize the cellulose acetate fiber, and examples thereof include triacetin. When a plasticizer is added to the cellulose acetate fiber, the cellulose acetate fiber is partially melted and the fibers are combined. As a result, the compression recovery of the filter material 121 is enhanced by the addition of a plasticizer to the cellulose acetate fibers. As the amount of added plasticizer increases, the compression recovery of the filter material 121 increases. For this reason, the compression recovery of the filter material 121 can be adjusted by adjusting the amount of added plasticizer. The amount of added plasticizer can be selected as desired in accordance with the desired compression recovery for the mouthpiece portion. In the filter material 121, it is preferred that the amount of plasticizer contained in the cellulose acetate fibers be, for example, from 0 to 20 weight percent with respect to the cellulose acetate fibers. In addition, an adhesive may be added to the filter material 121. When an adhesive is added, an effect similar to that obtained by adding a plasticizer can be achieved, and the compression recovery of the filter material 121 is increased. For this reason, the compression recovery of the filter material 121 can be adjusted by adjusting the amount of adhesive added. In addition, the filter material 121 may further comprise an adsorbent, for example, activated carbon, and a flavor-emitting material, such as a capsule of a flavoring substance.

(c) Filter wrapper (122)

The filter wrapper 122 may be, for example, a wrapper 122 used for a conventional filter smoking article 1, for example, cellulose acetate-based material, paper, cardboard, cellulose-based film, cellulose-based film or a combination thereof may be referred to as a wrapper filter. The filter wrap 122 may be single layer or may be formed of several sheets glued with adhesive or the like. The physical properties of the filter wrapper 122 affect compression recovery of the mouthpiece portion. When the bulk and thickness of the filter wrapper 122 increases, the compression recovery and stiffness of the mouthpiece portion generally increase. However, if the filter wrapper 122 consists of a general purpose filter wrapper, i.e., paper with a thickness of 50 μm and a bulk of 27 g / m2, the effect on compression recovery is small.

For a smoking article 1 with a filter according to the first embodiment, since both the arithmetic mean roughness of the outer peripheral surface of the outer wrapper 13 and the compression recovery of the mouthpiece portion are satisfactory, a pleasant sensation effect for the user (maintaining comfort in the user's mouth) while holding the mouthpiece portion while smoking.

In the first embodiment, an example is described in which the entire mouthpiece portion, which is a filter wrapped in an outer wrap, satisfies arithmetic mean roughness and compression recovery, but the present invention is not limited to this example. For example, only the end portion upstream of the mouthpiece portion, in direct contact with the user while holding the mouthpiece portion with lips when smoking, can satisfy these physical properties. The end portion downstream is located, for example, in the range of 15 mm from the end side further downstream and, preferably, in the range of 10 mm from the end further downstream. Even in such a structure, since the above physical characteristics are satisfied in the part where the user holds the mouthpiece portion with his lips while smoking, a smoking article with a filter can be obtained with reliable maintenance of comfort in the user's mouth.

In a smoking article with a filter according to the first embodiment, the stiffness of the filter wrapped by the overwrap is preferably less than 90%, more preferably 80% or more and less than 90%, even more preferably 85% or more and less than 90%. Preferably, the stiffness of the mouthpiece portion of the filter smoking article is not extremely high.

In the first embodiment, an example is described in which a single filter wrapper is used, but several filter wrappers may be joined by adhesive or the like.

(Second Embodiment)

The smoking filter article 1 of the second embodiment has the same arrangement as in the first embodiment shown in FIG. 3, but differs from the first embodiment only with respect to the materials contained in the outer wrapper 13 and the filter wrapper 122.

(a) Outer wrap (13)

The outer wrapper 13 is not particularly limited since its material has an arithmetic average roughness on the outer peripheral surface of less than 2.0 microns, more preferably less than 1.0 microns, when it is wrapped around the filter. The outer wrap 13 is formed, for example, of the same material as the outer wrap 13 described in the first embodiment, and has a lower thickness and bulk than those specified in the first embodiment. Outer wrap 13 may be, for example, plain glossy paper.

(b) Filter wrapper (122)

The angle of recovery after folding of the filter wrapper 122 is preferably 60 degrees or more, preferably 100 degrees or more, and even more preferably 100 degrees or more and 120 degrees or less. The filter wrap 122 is formed, for example, of the same material as the base layer described in the first embodiment. The filter wrapper 122 is preferably a film of a polyethylene resin, a polyolefin resin, such as polypropylene, or a polyester resin, and more preferably a film containing a polyester or polyolefin as a main component. Preferably, the filter wrapper 122 is a film stretched along two axes to increase rigidity and strength and to increase the angle of recovery after bending.

The bulk of the filter wrapper 122 is preferably 50 g / m2 or more and less than 200 g / m2, more preferably 100 g / m2 or more and less than 200 g / m2 to achieve appropriate compression recovery in the mouth piece. The thickness of the filter wrapper 122 is preferably 50 μm or more and less than 150 μm, and more preferably 100 μm or more and less than 150 μm, in order to achieve appropriate compression recovery in the mouthpiece portion. When the bulk and thickness of the outer wrapper 13 increase, the recovery angle after bending generally improves, and the compression recovery of the mouthpiece portion increases.

In addition, the bulk of the outer wrapper 13 and the filter wrapper 122 is preferably 50 g / m2 or more and less than 200 g / m2, more preferably 100 g / m2 or more and less than 200 g / m2 to achieve appropriate compression recovery in the mouthpiece . In addition, the bulk of the outer wrapper 13 and the filter wrapper 122 is preferably 50 microns or more and less than 150 microns, more preferably 100 microns or more and less than 150 microns to achieve appropriate compression recovery in the mouth piece.

In the arrangement according to the second embodiment, it is possible to achieve a pleasant sensation effect for the user (maintaining comfort in the mouth of the user) while holding the mouthpiece portion with lips when smoking, similar to smoking article 1 with a filter according to the first embodiment.

In a second embodiment, an example is given in which a single filter wrapper is used, but several filter wrappers can be attached with an adhesive or the like. In such a case, it is preferable that a plurality of adhered filter wrappers have the aforementioned bending recovery angle. The total bulk and thickness of several filter wrappers preferably fall within the above range.

(Third Embodiment)

In FIG. 4 is a schematic enlarged sectional view of a portion of a filter cigarette 2 according to a third embodiment. The filter cigarette 2 of the third embodiment has the same structure as the filter cigarette 1 of the first embodiment, except that the structure of the filter is different.

Filter 22 comprises two filter segments 22a and 22b. More specifically, the filter 22 is a so-called double filter, comprising a first filter segment 22a located on the upstream side and a second filter segment 22b located on the upstream side.

The first filter segment 22a consists of a first filter material 221a and a first inner filter wrapper 222a wrapped around the first filter material 221a. The second filter segment 22b consists of a second filter material 221b and a second inner filter wrapper 222b wrapped around the second filter material 221b. The first filter segment 22a and the second filter segment 22b are wrapped and connected by an outer filter wrap 22c covering the outer peripheral surfaces. The outer wrapper 23 is wrapped around the outer peripheral surfaces of the end portion downstream of the cigarette rod 11 and the filter 22 for connecting the cigarette rod 11 and the filter 22.

In a third embodiment, in a portion corresponding to at least a second filter segment 22b located on an end side downstream of the first and second filter segments 22a and 22b, the compression recovery after applying a compression load of 2.5 N is 60% or more , more preferably 60% or more and less than 80%, and even more preferably 60% or more and less than 70%. The arithmetic mean roughness of the outer peripheral surface at least in the portion of the outer wrapper corresponding to the second filter segment 22b is less than 2.0 μm, more preferably 1.5 μm or less, even more preferably 1.0 μm or less.

(a) Outer Wrap (23)

The outer wrapper 23 is formed, for example, of the same material as the outer wrapper 13 described in the first embodiment.

(b) Filter media (221a, 221b)

The first filter material 221a and the second filter material 221b are formed, for example, of the same material as the filter material 121 described in the first embodiment.

(c) Filter wrapper (222a, 222b, 22c)

The first and second inner filter wrappers 222a and 222b are formed from the same material as the filter wrapper 122 described in the first embodiment. The outer filter wrap 22c is formed, for example, of the same material as the filter wrap 122 of the first embodiment.

In the arrangement of the third embodiment, the end portion downstream that contacts the lips when the user holds the mouthpiece portion with lips with his lips satisfies the arithmetic mean roughness of the outer wrapper and the compression recovery of the mouthpiece portion, similar to a smoking article with a filter in the first embodiment. For this reason, in the arrangement according to the third embodiment, the possibility of achieving a pleasant feeling effect for the user (maintaining comfort in the user's mouth) while holding the mouthpiece portion with lips when smoking is similar to the first embodiment.

In a third embodiment, the first and second filter segments are formed from the same material, but the present invention is not limited to this. For example, the present invention may mean the presence of a double filter with other functions, the first filter segment being a carbon filter in which an adsorbent, for example, activated carbon or the like, is dispersed in the gaps between the cellulose acetate fibers, and the second filter segment is a white filter material, consisting of ordinary cellulose acetate fibers.

In addition, the smoking article with a filter according to the third embodiment is not limited to a double filter, but may be with a filter with three or more filter segments. A smoking article with a filter may be provided with one hollow portion between two filter segments or may be provided with a destructible capsule of the aromatic substance and flavor particles in the hollow portion. In these arrangements, if the physical characteristics of the compression recovery and the arithmetic roughness are satisfactory at least in the area corresponding to the filter segment located on the end side downstream of the several filter segments constituting the filter, the same effect can be achieved as for a smoking article with a filter according to the first embodiment.

(Fourth Embodiment)

The smoking filter article of the fourth embodiment has the same structure as the smoking smoking article 2 of the third embodiment shown in FIG. 4, and differs only with respect to materials for forming the outer wrapper 23, the outer filter wrapper 22c, and the second inner filter wrapper 222b.

(a) Outer Wrap (23)

The outer wrapper is not particularly limited since its material has an arithmetic average roughness on the outer peripheral surface of less than 2.0 microns, more preferably less than 1.0 microns, when it is wrapped around the filter. The outer wrapper is formed, for example, of the same material as the outer wrapper 13 described in the first embodiment, and a material with a smaller thickness and bulk than specified in the first embodiment. Outer wrapper 23 may be, for example, plain glossy paper.

(b) Filter wrapper (222a, 222b, 22c)

In a fourth embodiment, the first and second filter materials 221a and 221b are wrapped around two filter wrappers, i.e., the first and second inner filter wrappers 222a and 222b and the outer filter wrapper 22c.

The material of the first inner filter wrapper 222a is not particularly limited and is formed, for example, of the same material as the filter wrapper 122 described in the first embodiment.

The material of the second inner filter wrapper 222b and the material of the outer filter wrapper 22c are formed, for example, of the same material as the base layer described in the first embodiment. The material of the second filter inner wrapper 222b and the filter outer wrapper 22c is preferably a film of a polyethylene resin, a polyolefin resin such as polypropylene, or a polyester resin, and more preferably a two-axis elongated film containing a polyester or polyolefin as a main component.

The second inner filter wrapper 222b and the outer filter wrapper 22c are preferably in a state where they are glued to each other, and the angle of recovery after folding is 60 degrees or more, more preferably 100 degrees or more, and even more preferably 100 degrees or more and 120 degrees or less.

The total bulk of the second filter inner wrapper 222b and the filter outer wrapper 22c is preferably 50 g / m2 or more and less than 200 g / m2, and more preferably 100 g / m2 or more and less than 200 g / m2 to achieve compression reduction in the mouthpiece portion . The total thickness of the second inner filter wrapper 222b and the filter outer wrapper 22c is preferably 50 μm or more and less than 150 μm, more preferably 100 μm or more and less than 150 μm to achieve the corresponding compression recovery in the mouthpiece portion. When the bulk and thickness of the outer wrapper increase, the recovery angle after bending generally increases, and the compression recovery of the mouthpiece portion increases.

Furthermore, the total bulk of the outer wrapper 23, the second inner filter wrapper 222b and the outer filter wrapper 22c is preferably 50 g / m2 or more and less than 200 g / m2, and more preferably 100 g / m2 or more and less than 200 g / m2 to achieve appropriate recovery during compression of the mouth piece. The total thickness of the outer wrapper 23, the second inner wrapper 222b of the filter and the outer wrapper 22c of the filter is preferably 50 μm or more and less than 150 μm, more preferably 100 μm or more and less than 150 μm to achieve appropriate compression recovery in the mouthpiece portion.

In the arrangement of the fourth embodiment, the end portion downstream, which contacts the user when he holds the mouthpiece portion with his lips while smoking, has a satisfactory arithmetic mean roughness of the outer wrapper and compression compression of the mouthpiece portion. In the arrangement of the fourth embodiment, the effect of a pleasant user experience (maintaining comfort in the mouth of the user) can be achieved while holding the mouthpiece portion with lips when smoking, similar to a smoking article with a filter according to the third embodiment.

In a fourth embodiment, the filter material located at the end upstream is wrapped in two filter wrappers, but may be wrapped in three or more filter wrappers. In this case, a plurality of adhered filter wrappers preferably have the angle of recovery after bending mentioned above. In addition, it is preferable that the total bulk and thickness of several sheets of filter wrapper fall within the above range.

(Examples and comparative examples)

Embodiments will now be described by way of examples and comparative examples.

The tests described below (1) - (5) were carried out using external wrappers, filters and test samples in accordance with examples 1–7 and comparative examples 1–4 shown in Table. 1. The test sample is a filter wrapped in an outer wrapper obtained by the method described below. In outer wrappers according to examples 1–7 and comparative examples 1–4, measurements were made of (1) arithmetic mean roughness and (2) angle of recovery after bending. Further, sensory evaluations of (3) compression recovery, (4) stiffness, and (5) maintaining comfort in the user's mouth using test subjects were performed.

In Tab. 1 shows the product names, bulk, thickness, arithmetic average roughness and angle of recovery during bending and the amount of plasticizer by the filter, the outer wraps used in examples 1–7 and comparative examples 1–4, and the results of sensory evaluation of recovery under compression, rigidity, and maintaining comfort in the user's mouth for test samples.

Tab. 1

Outer wrap Filter Test sample Product name Main
weight
[g / m2] Thickness
[microns] Medium
arithmetic
roughness
[microns] Angle
recovery after bending [°] amount
plasticizer
[weight%] Recovery
under compression
[%] Rigidity
[%] Sensory assessment
[-] Example 1 Peach coat 180,4 132 0.7 100 0,0 61 89 5.1 Example 2 Peach coat 180,4 132 0.7 100 9.0 78 97 4.6 Example 3 Peach coat 180,4 132 0.7 100 17.0 73 98 4.0 Example 4 YUPOTRACE
# 60 60.7 61 1,5 138 9.0 60 86 4.8 Example 5 YUPOTRACE
# 60 60.7 61 1,5 138 17.0 73 91 4.2 Example 6 YUPOTRACE
# 60 93.5 92 1.3 141 9.0 68 89 4.6 Example 7 YUPOTRACE
# 60 93.5 92 1.3 141 17.0 69 92 4.3 Comparative Example 1 General Purpose Taper Paper 37 42,2 2,5 6 0,0 41 66 3.6 Reference Example 2 Cellophane 32.6 31 2.0 56 0,0 40 72 3.0 Reference Example 3 Cellophane 32.6 31 2.0 56 9.0 60 85 3.3 Reference Example 4 Cellophane 32.6 31 2.0 56 17.0 70 90 3,7

The outer wrappers of Examples 1–7 and Comparative Examples 1–4 are described below. Examples 1-3 used Peach Coat paper (registered trademark) (WER – 135DS, Nisshinbo Paper Products Inc.), which is a synthetic paper. Peach Coat paper (registered trademark) is formed from a base layer, which is a polyethylene terephthalate film, which is a polyester resin, and a surface layer, which is a white pigment coating layer. In Examples 4 and 5, YUPOTRACE (registered trademark) paper (TPRA # 60, Yupo Corporation), which is a synthetic paper, was used. In Examples 6 and 7, YUPOTRACE (registered trademark) paper (TPRA # 90, Yupo Corporation) was used. YUPOTRACE (registered trademark) paper is formed from a base layer, which is a two-axis elongated film formed from polypropylene resin, and a surface layer, which is a paper-like layer formed from resin. In contrast, in comparative example 1, general purpose taper paper formed from paper used for filter cigarettes, such as Mobius Light (registered trademark) of Japan Tobacco Inc., was used. In comparative examples 2–4, cellophane was used (bulk: 33 g / m2 and thickness: 30 μm).

The filters described in Examples 1–7 and Comparative Examples 1–4 are described below. Cellulose acetate fiber (Daicel Corporation) with a single thread weight of 1.9 g / 9000 m was used as filter material. Paper (manufactured by Nippon Paper Papylia Co., Ltd.) with a thickness of 50 μm and a core was used as a filter wrapper. weighing 27 g / m2, which is a general-purpose filter wrapper.

In the filters of example 1 and comparative examples 1 and 2 used filter material consisting only of cellulose acetate fibers. In the filters of examples 2, 4, and 6 and comparative example 3, filter material was used, obtained by adding 9.0 weight% plasticizer, which is triacetin, to cellulose acetate fibers. In the filters of examples 3, 5 and 7 and comparative example 4, filter material was used, obtained by adding 17.0 weight% plasticizer, which is triacetin, to cellulose acetate fibers.

In addition, the test sample was prepared by the following method. The filter materials of Examples 1–7 and Comparative Examples 1–4 were wrapped in the usual way with a filter wrapper and cut to prepare filters with a length of 27 mm and a diameter of 24.2 mm. In addition, the outer wrappers of Examples 1-7 and Comparative Examples 1-4 were wrapped around each filter with double-sided tape. In this test sample, since a double-sided tape is applied only to a portion of the joint of the outer wrapper, the tape does not affect the sensory assessment of maintaining comfort in the user's mouth.

The following are tests (1) - (5).

(1) Arithmetic average roughness

Arithmetic average roughness was measured for outer wrappers according to examples 1–7 and comparative examples 1–4. Arithmetic average roughness was measured on the surface serving as the outer peripheral surface when wrapping around the filter among the surfaces of the outer wrapper. The arithmetic mean roughness was measured using Surftest SJ-210 (trade name) manufactured by Mitutoyo Corporation. A Gaussian filter was used for filtration when measuring arithmetic mean roughness. In addition, a detector with a shape having a sharp tip R = 2 μm and a tip angle of 60 degrees was used as a detector. The measurement conditions were determined by setting standard conditions for compliance with ISO1997, and setting the roughness curve R to the cutoff value λc = 2.5 mm, λs = 8 μm and the number of sections (N) 4.

(2) Angle of recovery after bending

The angle of recovery after bending was measured for the outer wrappers according to examples 1–7 and comparative examples 1–4. As a device for evaluation, a rubber roller and a metal roller were used, which were in contact with each other to create a pressure in the contact zone of the rollers of 0.1 MPa. First, the outer wrappers of Examples 1–7 and Comparative Examples 1–4 were cut to 5.5 cm × 5.5 cm in size, and a loop was formed so that it did not create a crease and was positioned on one side to the opposite side. Then, each of the outer wrappers was passed between the rubber roller and the metal roller of the above-mentioned evaluation device, and each of the outer wrappers bent at an angle of 180 degrees was quickly moved to the laboratory bench, and the recovery angle after bending (°) was measured after 30 seconds.

(3) Compression Recovery

The compression recovery test was conducted on test samples in Examples 1–7 and Comparative Examples 1–4. Compression recovery is calculated from the curve of the compressive recovery force versus the compressive strain obtained by plotting the compressive recovery force [N] corresponding to the compressive strain [mm], as shown in FIG. 1. The amount of deformation under compression [mm] is the amount of deformation of the diameter of the test specimens compressed under compression load. Compressive restoring force [N] is the force by which compressed test specimens try to return to their original shape.

A viscometer (CR – 3000EX – S manufactured by Sun Scientific Co., Ltd.) was used as a device for evaluating the measurement of the recovery force curve in compression versus the amount of compression deformation. In FIG. 5 schematically shows a method for measuring recovery in compression. The viscometer contains a measuring table 103, on which the test sample is placed, and a cylindrical piston 104 with a diameter of 10 mm Next, the test sample 105 was placed on the upper surface of the viscometer measuring table 103 so that its side surfaces were in contact. When the piston 104 does not apply a compression load to the test piece 105 ((a) in FIG. 5), the compressive recovery force from the test piece 105 is 0 N and the compressive strain is 0 mm (point A). Further, the cylindrical piston 104 advances vertically at a speed of 13 mm / min until the applied compressive load on the test sample 105 becomes 2.5 N and the test sample 105 is compressed vertically ((b) in FIG. 5). The restoring force in compression [N], corresponding to the value of deformation in compression [mm], is then recorded (curve A – B). Further, when the compression load reaches 2.5 N (the restoring force in compression is 2.5 N), the compression operation performed by the piston 104 is terminated and the compression strain TB mm is reached (point B). After that, the compression operation is stopped, and the piston 104 can move freely in the vertical direction, and the restoring force in compression [N], corresponding to the amount of deformation in compression (mm), when the shape is restored until the restoring force from the test sample 105 becomes 0 N (curve B – C). Further, when the recovery force during compression reaches 0 N, the amount of compression strain TC mm at this time is recorded (point C). As a result of this, various curves were shown in compression (curve A – B) and in recovery (curve B – C) on the curve of the restoring force in compression versus the value of compression strain in FIG. 1. In FIG. 1, the point at which the compression strain TB mm and the compressive recovery force 0 N are represented as point D.

The amount of work (area of the ABD region) during compression (curve A – B) and the amount of work (region CBD) during recovery (curve B – C) are calculated from the curve of the restoring force in compression, depending on the amount of deformation under compression. Compression recovery [%] is calculated using the following equation.

Compression Recovery [%] = (CBD Area Area) / (ABD Area Area) × 100 [%]

(4) Rigidity

The stiffness test was carried out on the test samples according to examples 1-7 and comparative examples 1-4. A densitometer DD60A from Borgwaldt Corporation was used as an evaluation device. Rigidity is determined by applying a load of 2 kg to 10 test specimens for 20 seconds and measuring the average diameter of the recess in the filter wrapped in an outer wrap. The test is carried out at an ambient temperature of 22 ± 2 degrees Celsius in accordance with the standard test method for this device.

Such a device contains two parallel pairs of metal cylinders, each cylinder has a length of 16 cm and a diameter of 10 mm. The first pair of cylinders is located with a gap of 16 mm and parallel to each other under ten test specimens as a support for the test specimens, and ten test specimens arranged in parallel with equal intervals so that the test specimens pass the first pair of cylinders. During the tests, the first pair of cylinders remains stationary. The second pair of cylinders is aligned with the first pair of cylinders so that the first pair of cylinders and the second pair of cylinders approach each other with test specimens located between them during the tests. The second pair of cylinders is designed to move to ten test samples and carries out the application of a load of 2 kg to ten test samples from above. In this case, each of the first and second pair of cylinders is in contact with the test samples at 20 points. The load on the test samples is maintained for 20 seconds, and the test is completed after measuring the diameters of the compressed test samples. During the test, the test samples are spaced so that they do not touch each other. To support the tips of the ten test samples, a framework is used that allows ten test samples to be at a certain distance from each other with equal intervals and parallel to each other during the test. This test method is similar to the stiffness measurement method described in JP 2016-523565 A.

(5) Sensory assessment of holding sensation

The test samples in examples 1–7 and comparative examples 1–4 were actually held by a group of twenty-three people, and sensory evaluations were carried out according to the sensations of holding the mouthpiece area with the lips (maintaining comfort in the user's mouth). A group of twenty-three people rated maintaining comfort in the user's mouth by means of numerical values on a seven-digit scale, that is, “7” when the feeling was very comfortable, “6” when they liked the feeling, “5” when they didn’t feel really liked, “4” - when they could not say anything about their feelings, “3” - when the feeling was somewhat sensation was disgusting, and the values averaged.

As can be seen from the results in Table. 1, in the test samples according to examples 1-7, in which the arithmetic average roughness of the outer peripheral surface of the outer wrapper is less than 2.0 μm, and the recovery under compression is 60% or more, the sensory score was high from 4.0 to 5.1. All test samples in examples 1-7 had a recovery angle after bending on the outer wrapper of 100 degrees or more. In addition, in examples 1, 4 and 6, in which the stiffness of the test samples is less than 90%, according to examples 1-7, the sensory score was especially high from 4.6 to 5.1. In particular, in Example 1, in which the arithmetic average roughness is 0.7 μm or less, the recovery under compression is 61%, the stiffness is 89%, and the angle of recovery after bending is 100 degrees, the recovery under compression is 5.1, t. e., the maximum value.

In contrast, in comparative examples 1-4, in which the arithmetic mean roughness is 2.0 or more, the sensory score was lower than 4.0. In comparative examples 1–4, all recovery angles after bending the outer wrappers were less than 60 degrees.

As indicated above, it is representative that the test samples of Examples 1 to 7, having an arithmetic average roughness of less than 2.0 μm on the outer peripheral surface of the outer wrapper and recovery under compression of 60% or more, were rated highly by sensory evaluation, and their attractiveness was improved.

Although several embodiments have been described, these embodiments are provided by way of example only and are not intended to limit the scope of the present invention to them. Indeed, these embodiments described herein may be implemented in various other forms; in addition, various changes in the form of the embodiment described herein can be made without departing from the essence of the present invention. The dependent claims and their equivalents are intended to cover such forms or modifications that are intended to fall within the scope and spirit of the present invention.

List of Reference Items

1 ... a smoking article with a filter according to the first embodiment, 11 ... an aerosol generating element (cigarette core), 111 ... cut tobacco, 112 ... cigarette paper, 12, 22 ... filter, 121 .. filter material, 13, 23 ... outer wrapper, 2 ... smoking article with a filter according to the third embodiment, 22a ... first filter segment, 22b ... second filter segment, 221a ... first filter material, 221b ... second filter medium, 222a ... first inner filter wrapper, 222b ... second inner filter wrapper, 22c ... outer filter wrapper.

Claims (17)

1. A smoking article with a filter, characterized in that it contains: an aerosol generating element; a filter comprising filter material and one or more filter wrappers wrapped around the outer peripheral surface of the filter material; and an outer wrapper wrapped around the outer peripheral surfaces of the end portion of the aerosol generating element and the filter, the outer peripheral surface of the outer wrapper having an arithmetic average roughness of less than 2.0 μm and the filter wrapped in the outer wrapper has a compression recovery of 60% or more after applying a load to 2.5 N compression to a length range of 10 mm in the direction of its diameter. 2. A smoking article with a filter according to claim 1, characterized in that the arithmetic mean roughness of the outer peripheral surface of the outer wrapper is 1.0 μm or less. 3. A smoking article with a filter according to claim 1 or 2, characterized in that the angle of recovery after bending the outer wrapper or one or more filter wrappers is 60 degrees or more. 4. A smoking article with a filter according to claim 3, characterized in that the angle of recovery after bending the outer wrapper or one or more filter wrappers is 100 degrees or more. 5. A smoking article with a filter according to claim 4, characterized in that the angle of recovery after bending the outer wrapper or one or more filter wrappers is 100 degrees or more and 120 degrees or less. 6. A smoking article with a filter according to any one of paragraphs. 1-5, characterized in that the outer wrapper is a sheet containing several layers. 7. A smoking article with a filter according to claim 6, characterized in that the sheet containing several layers contains a base layer consisting of a film containing a polyolefin or polyester as the main component. 8. A smoking article with a filter according to claim 7, characterized in that the base layer is a film elongated along two axes. 9. A smoking article with a filter according to claim 7 or 8, characterized in that the sheet containing several layers further comprises a surface layer provided on one surface or both surfaces of the base layer. 10. A smoking article with a filter according to claim 9, characterized in that the surface layer contains an inorganic filler. 11. A smoking article with a filter according to any one of paragraphs. 1-10, characterized in that the stiffness of the filter wrapped in the outer wrapper is less than 90%. 12. A smoking article with a filter according to any one of paragraphs. 1-11, characterized in that the bulk of the outer wrapper is 100 g / m ² or more. 13. A smoking article with a filter according to any one of paragraphs. 1-12, characterized in that the thickness of the outer wrapper is 100 μm or more. 14. A smoking article with a filter according to any one of paragraphs. 1-11, characterized in that one or more filter wrappers are films containing a polyolefin as a main component, or films containing a polyester as a main component. 15. A smoking article with a filter according to claim 14, characterized in that one or more of the filter wraps are film elongated in two directions. 16. A smoking article with a filter according to claim 14 or 15, characterized in that the total bulk of one or more filter wrappers is 100 g / m ² or more. 17. A smoking article with a filter according to any one of paragraphs. 14-16, characterized in that the total thickness of one or more filter wrappers is 100 μm or more.

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