JP2000050857A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter to be used together with smoking materials in order to filter secondary smoke. SOLUTION: This filter 1 is such one as to be furnished with a sleeve 10 which has a downstream part 11 suitable for trapping sucked smoke at a sucked smoke pathway 13, an upstream part 12 for sucking sucked smoke and suitable for trapping issued smoke at an issued smoke pathway 14, a filter means 15 disposed along the issued smoke pathway 14, and a means 16 for preventing the backflow of ambient air via the issued smoke pathway; and a filter sheath 3 is suitable for being superposed upon most of the secondary smoke releasing region for a rod-like smokable material 1; the filter sheath 3 is sufficiently porous and never impaired significantly due to cigarette burning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to filters used with smoking articles to filter secondary smoke.
The present invention also relates to a smoking article using such a filter. Sidestream smoke

BACKGROUND OF THE INVENTION As used herein, the term "smoke" may include visible smoke, particulate matter in smoke, harmful gases, vapors, aerosols, etc., produced by smoking articles. A “smoking article” may include a cigarette (including a cigarette, a coaxial cigarette, etc.), a cigar, a simulated smoking article, a pipe, and the like.
"Smoking substance rods" may include cigarettes, cigars, and the like. "Combustion" may include smoldering conditions. "Secondary smoke" includes smoke exhaled by a smoker and / or sidestream smoke released from the burning portion of a smoking article into the surrounding environment.

[0002] Smoking practices produce secondary smoke, which causes considerable discomfort and harm to passive smokers. Attempts made in the past to reduce passive smoking have not been very successful.

In particular, US Pat. No. 4,369,798 discloses a combination of a cigarette holder and a cigarette discharge smoke catcher, comprising a cigarette holder body terminated at one end within a hollow mouthpiece. It had been.
The mouthpiece communicates with a pair of parallel cylindrical passages provided in the holder body. One passage holds the non-lit end of the cigarette and the other passage holds a cartridge for a smoke trap for filtering the exhaled smoke drawn into the mouthpiece. Nevertheless, the cigarette holder has the following disadvantages.

(A) In order to hold a cigarette, a valve means in a passage is used in a holder body. The valve means is provided to allow the flow of smoke. However, in use, the action of the valve means actually interrupts the flow of smoke and increases the difficulty of inhalation. (B) The flow of smoke through the passage holding the cigarette causes the paper to flow. The communication state of the cigarette may be substantially impaired. For this reason, the valve means is not essential for the function of the holder body. (C) the weight and size of the cigarette holder by the valve means;
In addition to increased cost, manufacturing complexity is increased. (D) the passage for holding the filter of the smoke trap is open at the other end away from the mouthpiece and out of the body. Therefore, the discharge flow is forced to travel a long distance through the passage before reaching the surrounding environment and along the length of the filter cartridge of the smoke trap. This increases the resistance to divergence and unnecessarily increases the size and weight of the holder body. e) The smoke collection surface of the filter cartridge of the smoke trap is limited by the radial cross section of the second passage. Small cross-sections may limit the filtration efficiency, while large cross-sections can make the circumference of the holder considerably larger and less elegant. (F) The holder is not originally disposable, but is a filter for replaceable smoke traps A cartridge is used. It is inconvenient to attach and remove cigarettes and cartridges. (G) Holders are provided as thick and short,
It usually has a rectangular body. The relatively large circumference of the holder body makes it unsuitable for pre-loading and communicating in a cigarette and cigarette box together. (H) The holder body is not coaxially aligned with the cigarette. It does not have a streamlined profile for cigarettes, but a discerning smoker may want such a profile. (I) The holder body consists of a hinged half. For this reason, attaching and detaching a cigarette and a filter cartridge requires some labor.

[0005] Australian Patent Application Publication No. 76346
No./91 disclosed a method for producing a non-combustible winding material for use in smoking products. U.S. Pat. No. 3,220,
Nos. 418 and 3,886,954 disclosed cigarettes having an essentially non-combustible sheath that retains the ash and covers the burning portion of the cigarette.
However, these prior arts lack a filtration function for sidestream smoke filtration.

For example, US Pat. No. 4,685,477 describes a protective filter sheath for surrounding cigarettes. In this article, the filter wall is not wrapped around the surface of the cigarette, but is substantially separated from the cigarette with an air space in between. Thus, in this article, the space between the cigarette and the filter wall greatly increases the size of the circumferential method handled by the smoker.

[0007] None of the prior art has been very successful in the market. Thus, secondary smoke continues to affect countless non-smokers day and night. The present invention is intended to provide a better solution to the problem of secondary smoke pollution, if possible, which would eliminate or mitigate the various disadvantages of the prior art detailed above. are doing.

According to a first aspect of the present invention, a filter sleeve for filtering exhaled smoke comprises:
A downstream portion arranged in communication with the smoking article to collect inhaled smoke from the smoking article; an upstream portion arranged to collect inhaled smoke into the human body and to collect exhaled smoke; and carry the inhaled smoke. At least one suction flue extending from the downstream portion to the upstream portion and adapted to be inhaled by the human body via the upstream portion and extending from the upstream portion to at least one outlet to the surrounding environment. Thereby, at least one discharge flue for passing and filtering the discharged smoke collected in the upstream portion and discharging the filtered air to the surrounding environment, and disposed along at least one discharged flue, Filter means for filtering the collected exhaled smoke to produce filtered air, the filter means having the ability to make the filtered air substantially free of smoke, wherein the smoking article comprises a downstream portion of the sleeve. Air after filtration when in fluid communication Filter means so that emissions to the surrounding environment are not significantly impeded by smoking articles, and backflow of ambient air through the discharge flue, which can pass a significantly higher rate of discharge flow through the discharge flue. Means for substantially preventing.

In accordance with a second aspect of the present invention, a filter sheath for filtering sidestream smoke is disposed over the significant area of the sidestream emission region of the rod of smokable material. And the majority of the sheath is comprised of a filter material that is substantially impermeable to sidestream smoke, and the sheath has sufficient porosity to provide the air required to burn the rod of smokable material. It has a degree and is not significantly impaired by the burning of the rod of smokable material.

[0009] In its most essential form, the filter sleeve and the filter sheath each comprise a narrow body, the sleeve and the sheath having a narrow body along the flue of secondary smoke passing through the narrow body. It is similar in that it is provided in. The differences in the way filter sleeves and filter sheaths are related to smoking articles reflect the different ways in which the same essential form is applicable to two different aspects of secondary smoke: exhaled smoke and sidestream smoke. I have. If, instead of a filter sleeve, the most essential form of the filter sheath is connected end-to-end in communication with the mouth side of the cigarette, the sheath can also filter the exhaled smoke. Various other features of the filter sleeve are provided to enhance the performance of the sleeve to meet the minimum level of smoker expectations. The particular method of arranging the filter sleeve and filter sheath in association with the smoking article provides the present invention with a number of advantages over the prior art.

[0010] Possible advantages of the invention include (a) a thinner filter, (b) reduced weight, (c) provision of a disposable filter which communicates with a cigarette or cigar, (d) easy and economical. No loading and (e) maintenance. Other possible advantages of this filter sleeve and filter sheath will be readily apparent from the description, the embodiments, the examples, the drawings and the claims.

The filter sleeve can be used with smoking articles such as cigarettes (including conventional cigarettes, light cigarettes, coaxial cigarettes, etc.), cigars, simulated smoking articles, pipes and the like.

[0012] At least one downstream inlet may be provided in the downstream portion of the sleeve, and the downstream inlet may be provided to collect smoke in the smoke flue. The downstream inlet may be provided near the downstream end of the sleeve and / or the downstream end of the wall of the sleeve. If the downstream inlet of the sleeve is in fluid communication with the smoking article,
Smoke from the smoking article can be drawn into the downstream inlet, moved through a suction flue and discharged through the upstream portion of the sleeve for inhalation into the human body.

[0013] The upstream portion can collect the discharged smoke at a considerably high discharge flow rate.

By providing at least one upstream outlet in the upstream portion of the sleeve, smokers carried through the suction flue can be smoked by the smoker via the upstream outlet. The upstream outlet may be provided near the upstream end of the sleeve and / or the upstream end of the wall of the sleeve.

[0015] At least one upstream inlet may be provided in the upstream portion of the sleeve. The upstream inlet may be provided to collect the discharged smoke in the upstream portion and the discharged flue. The upstream inlet is the upstream end of the sleeve and / or
Alternatively, it may be provided near the upstream end of the wall of the sleeve. The upstream inlet allows the discharge flow to pass at a significantly higher flow rate. The upstream side entrance preferably has a total opening area of 4 square millimeters or more for collecting discharged smoke.

[0016] At least one upstream outlet is provided at an upstream portion of the sleeve, and suction smoke carried through the suction flue is sucked into a human body through the upstream outlet, and at least one upstream outlet is provided. A side inlet may be provided in the upstream portion, and the discharged smoke may be collected in the upstream portion and the discharged flue so that the upstream outlet and the upstream inlet coincide. Upstream outlet / entrance (outlet-c
The um-inlet allows the smoker to inhale and exhale smoke from the sleeve without any adjustment of the sleeve.

The at least one suction flue may communicate at least one downstream inlet and at least one upstream outlet of the sleeve. In one example, the suction flue can be defined by an elongated hollow portion inside the sleeve.

The discharge flue may exit the sleeve through the sleeve wall.

The discharge flue can pass a significantly higher rate of discharge flow so that discharge through and into the discharge flue is facilitated. In one embodiment, the discharge flue can be defined by an elongated hollow portion inside the sleeve. In this case, the exhaled smoke flows longitudinally along the hollow part and can leave the sleeve via an opening formed in the sleeve wall (side wall) and / or in the peripheral area of the downstream end of the sleeve.

The intake and exhaust flues may be partially or wholly coincident. In one example, a portion of the discharge flue coincides with a portion of the suction flue. FIG. 2 below shows one embodiment of such an example. In the second example, a part of the discharge flue may coincide with the entire suction flue. This will become apparent from the description of FIG. 4 below. In a third example, the entire discharge flue may coincide with the entire suction flue, such as when the sleeve wall is made of porous activated carbon paper. In this case, a thin plastic film may be placed on the porous activated carbon paper. The plastic film may be perforated to achieve openings and flaps. The opening may be opened by moving the flap outward in a direction away from the sleeve. When the downstream end of the sleeve is in communication with the smoking article, the exhaled smoke from the open end on the upstream side of the sleeve can move along the elongated hollow portion of the sleeve, so that the flap is opened to discharge the exhaled flow from the opening. Can be taken out of the sleeve. When the upstream open end of the sleeve is sucked, the flap closes and the smoke flow can move through the same elongated hollow portion described above. In one embodiment, the porous activated carbon paper may be overlaid on an inner sleeve made of a thin film. The inner sleeve may have openings corresponding to the openings and flaps of the outer plastic film so that the inhaled smoke flowing along the elongated hollow portion of the inner sleeve is substantially porous activated carbon paper. And the taste of the smoke is not significantly affected by the porous activated carbon paper. By using substantially the entire space of the elongated hollow portion of the sleeve, the resistance to suction and discharge is reduced, and this embodiment is suitable for use with rods of a smokable substance having a relatively small outer circumference. It will be.

[0021] The filter means may comprise a filter material realized on at least a part of the wall of the sleeve. In this case, the smoke discharged via the discharge flue via the filter material may be filtered laterally. Also included is a filter material implemented in at least one discharge flue wall.

In one example, the filter sleeve may be suitable for use with a rod of smokable material having a large radial cross section, such as a cigar or tobacco pipe. In this case, the filter means of the sleeve may comprise a filter plug retained inside the discharge flue of the sleeve, said filter plug having a sufficient radial cross-section and having a low resistance to discharge flow. And the sleeve can have a low resistance to ejection.

The filter means has an efficiency such that the filtered air is substantially smoke-free, so that nearby non-smokers can enjoy a substantially smoke-free environment.

The filter means may be capable of passing a substantially higher rate of the discharge stream. This can be achieved, for example, by using a filter material that is less resistant to dispensing, or by providing a large smoke collection and filtering surface and / or dispensing through a porous filter material that forms, for example, most of the reasonably thin sleeve wall This can be achieved by reducing the distance the smoke travels through the filter material as it is carried laterally.

This filter means may not be practically replaceable. For example, a replaceable filter cartridge or any filter material that is selectively replaced may not be used while continuing to use other portions of the sleeve for its intended purpose. In one embodiment, a sleeve having a non-replaceable filter component is formed integrally with the cigarette or cigar, so that the sleeve and its filter component can be discarded together after consumption of the cigarette or cigar. You may. In another embodiment, a separate filter sleeve may be provided so that a smoker can personally attach the filter sleeve to a smoking article. Such a sleeve may use a long-lasting non-replaceable filter component, whereby the filter sleeve and one or more smoking articles may be used with the filter sleeve prior to disposing of the filter component together. May be filtered.

[0026] The filter means may include at least one layer of filter material. In one example, the filter means may include one layer for filtering particulate matter and another layer for filtering gaseous components. The filter material may be realized in a porous host material such as a polymer or a ceramic or a composite.
In one embodiment, the filter means may comprise an activated carbon porous paper or fabric forming the walls of the sleeve. This material may be readily biodegradable.

[0027] The filter means may comprise any combination of filter media or material that filters the secondary smoke. This includes adsorbents for physical adsorption. In this case, the exhaled smoke is bound to the filter material by intermolecular pulling action. Examples of adsorbents include forms and combinations of fuller's earth, activated clay, bauxite, alumina, bone char, decolorizing char, gas adsorbent carbon, molecular sieve activated carbon, synthetic polymer adsorbent, silica gel or molecular sieve. There are numerous patents for suitable activated carbon filter materials.

Further, additives for chemical adsorption of the discharged smoke are also included. In this case, the emitted smoke can chemically interact with the additive. Various prior art adsorbing methods for sidestream reducing cigarette wrapping materials and smoke filtration devices as accessories are adaptable in the filter sleeve of the present invention.

In another example, the filter means may include at least one electrically charged / discharged ion exchange medium.

The sleeve may include an outer wrap, preferably air permeable. This hides the filter material used and prevents black ash from falling from the activated carbon material,
Alternatively, it may be useful to improve the look and feel of the article.

The evacuation of the filtered air to the surrounding environment may take place via the wall of the sleeve and / or via the downstream end of the sleeve. In one embodiment, the filter means may be provided with filter material realized in the wall of the sleeve.
When the downstream end of the sleeve is substantially blocked by a smoking article in communication with the downstream end, exhaled smoke blowing into the upstream end of the sleeve is moved along the elongated hollow portion of the sleeve, Can be filtered laterally through the filter material realized in the wall. Thereby, the air after filtration is directly discharged to the surrounding environment. In other embodiments, the inner sleeve may be substantially coaxial within the outer sleeve. The inner sleeve has a closed downstream end. A smoking article may be engaged with the downstream end in fluid communication with the outer sleeve. The filter material disposed in the inner sleeve produces filtered air as the exhaled smoke blows into the upstream open end of the inner sleeve. In this case, the air after the filtration can be discharged through a tubular projection connecting the downstream portion of the inner sleeve and the opening formed in the wall of the outer sleeve. In a third embodiment, when a smoking article is inserted into and held within the downstream portion of the sleeve,
A longitudinal groove formed in the inner wall of the downstream portion of the sleeve may be moved into the discharge flue so that the filtered air can be discharged.

The means for substantially preventing backflow of ambient air through the discharge flue may completely block backflow of the ambient air through the discharge flue, Alternatively, a predetermined amount of ambient air may be passed through the discharge flue to dilute the smoke. In one embodiment, both the intake and exhaust flues may be in fluid communication with the upstream opening of the sleeve. In this case, a valve assembly provided along the discharge flue allows a predetermined amount of ambient air to pass through the discharge flue, before the smoke passing through the suction flue reaches the mouth of the smoker. May be diluted.

[0033] The means for substantially preventing backflow of ambient air through the discharge flue may include a valve system provided along the discharge flue.

The means for substantially preventing the backflow of ambient air through the discharge flue may have a valve system provided outside the sleeve. In this case, the valve system may be adapted to cooperate with the discharge flue and substantially prevent backflow of ambient air through the discharge flue. For example, the valve assembly may be provided in a passage in the tobacco shaft, filter mouth or insertion portion, and the valve assembly may be provided such that the tobacco shaft, filter mouth or insertion portion is downstream of the filter sleeve. When in communication with the portion, it may be in fluid communication with the discharge flue of the filter sleeve.

In one example, the valve assembly used as a means for substantially preventing backflow of ambient air through the discharge flue can be retrofitted from an existing valve system. The movable valve member may be resiliently biased toward the closed position, or may be closed by ionic or electrostatic, magnetic attraction or air pressure. If necessary, a certain amount of ambient air flows into the sleeve via the valve system,
The at least one movable valve member may be adapted to be partially closed so that the smoke can be diluted when the sleeve is in fluid communication with the smoking article. In addition to this
Alternatively, a hole may be formed in the wall or sleeve downstream of one or more valve members or sleeves to allow ambient air to be introduced into the smoke stream and to dilute the smoke. The size and number of the holes can be such that the unfiltered discharge flow released to the surrounding environment is not too high. Preferably, said hole can be provided downstream of a valve system arranged along the suction flue to block the discharge flow, so that the discharge smoke does not leave the sleeve via said hole. The holes may be distributed in any conventional manner in the preferred area of the sleeve.

In one example, the means for substantially preventing the backflow of ambient air through the discharge flue can be provided in a special configuration in the upstream portion of the sleeve. Thereby, the upstream outlet in a state communicating with the suction flue and the upstream inlet in a state communicating with the discharge flue are sufficiently distinguished from each other, and from the upstream outlet without substantially inhaling from the upstream inlet. Can be inhaled. In one embodiment, the upstream portion of the sleeve may include an inner tube coaxially disposed within the outer tube such that the upstream end of the inner tube projects from the upstream end of the outer tube. In this state, the elongated hollow portion of the inner tube can define a suction flue for drawing in the smoke. This can define a discharge flue for carrying the discharge flow in the space between the outer wall of the inner tube and the inner wall of the outer tube. In use, the smoker closes the mouth on the protruding upstream open end of the inner tube, draws in the smoke, then adjusts the mouth and brings it over the shorter outer tube, The exhaled smoke can be returned to the filter sleeve and filtered. The exhaled smoke cannot substantially enter the intake flue. Such a route is substantially obstructed by the mouthpiece of the filter or the tobacco shaft of the communicating smoking article.

The upstream portion through the upstream inlet, the discharge flue, the filter means and the means for preventing backflow of ambient air through the discharge flue can pass the discharge flow at a considerably higher rate. Yes, this allows the smoker to exhale smoke into the filter sleeve quite easily. Furthermore, this minimizes the pressure of the backflow of the exhaled smoke through the suction duct, so that the backflow can be sufficiently blocked by the smoking article in communication with the downstream portion of the filter sleeve.

It is preferred that the sleeve be suitably rigid so that more robust handling is possible. When the rigidity of the wall of the sleeve is low, a rigid support may be provided by, for example, a support layer, a mesh, a rib, or the like.

A filter plug for filtering the smoke may be provided along the smoke stack. The filter plug may be provided as an auxiliary or as a replacement for the mouthpiece of the filter of the smoking article. Alternatively, a filter sleeve may be provided as an additional element when used with a smoking article without a filter.

[0040] The filter means may comprise a filter material realized on at least a part of a sleeve, a wall or a wall in at least one discharge flue,
A valve assembly may be provided along the suction flue or outside the sleeve. The valve assembly is adapted to cooperate with the suction flue to pass smoke through the suction flue, but to be substantially suitable to substantially prevent a discharge stream from passing through the suction flue. Can be. In one embodiment, a valve assembly is provided along a passage in the tobacco shaft, filter mouth or insertion portion, whereby the tobacco shaft, filter mouth or insertion portion communicates with the downstream portion of the filter sleeve. When in the state, the valve assembly and the suction duct of the filter sleeve may be connected in fluid communication.

Additionally or alternatively, the dual-acting valve assembly may be adapted for the inlet and outlet flue of a sleeve that is opened and closed in the opposite direction, and the direction of fluid flow therethrough. And the desired mixing amount can be determined.

The outer circumference of the sleeve is not significantly greater than the outer circumference of the rod of the smoking article. Rods for smoking articles
The handle of a tobacco pipe may be included. Preferably, the sleeve in communication with the smoking article provides a streamlined profile and the outer circumference of the sleeve is the same as or the outer circumference of the rod of the smoking article so that it appears as a natural extension of the smoking article. It is a close value. When used with a smoking article having a rod with a large outer circumference, the sleeve may have a suitably small outer circumference or may be tapered toward the mouth end. The sleeve is
Any reasonable cross-sectional shape may be used.

[0043] The filter sleeve may be adapted for substantially coaxial alignment in communication with the rod of the smoking article. When provided in communication, the respective communication portions of the filter sleeve and the smoking article may be wound with a wrapping material.

[0044] Fluid communication between the filter sleeve and the smoking article may be achieved in any manner. In one embodiment, fluid communication between the downstream portion of the sleeve and the smoking article is provided by a tubular intermediate member connecting the downstream portion of the sleeve and the mainstream smoke outlet of the smoking article. In other embodiments, the mouth end of the cigarette may abut the downstream inlet of the filter sleeve, or the mouth end may fit into the downstream inlet of the filter sleeve.

The upstream portion of the sleeve may be wrapped with a wrapping material and / or mouthpiece forming material. The winding material and / or
Alternatively, the mouthpiece forming material may be conventionally air permeable or air impermeable. Preferably, the wrapping material and / or mouthpiece forming material may not cover either the upstream outlet or the inlet.

A whistle may be incorporated or provided along the discharge flue so that the smoker can determine the condition of his lungs from the whistle sound.

The filter sleeve can incorporate any combination of the features described above.

The filter sleeve may incorporate any one or more of the combinations of the features described in detail above. In this case, the downstream portion of the sleeve may be provided in fluid communication with the mainstream smoke outlet of the smoking article, thereby preloading one or more of the above filter sleeves having the smoking article. Such a pre-loaded configuration reduces the need for the smoker to attach the smoking article to the filter sleeve.

The filter sheath of the present invention can be used with rods of a smokable substance, such as cigarettes (including fine cigarettes and coaxial cigarettes), cigars, and simulated smoking articles.

The sheath can be adapted to cover a significant area of the sidestream smoke emission area of the rod of smokable material. This may include a sheath suitable to cover the entire sidestream smoke emission area of the rod of smokable material. In a conventional cigarette or cigar, the combustible surface of the cigarette or cigar may constitute the sidestream smoke emission area of the cigarette or cigar. If a rod of smokable material is used, such as a cigarette or cigar wrapped with uneven paper, with a non-horizontal outer surface centered on the sidestream smoke emission area, the sheath will have a high This allows the lower surface to be significantly hidden by the sheath, but also the sidestream smoke released through the lower surface through the sheath. It can be substantially filtered. Preferably, there is no need for the smoker to make intermediate adjustments to the sheath during the course of smoking.

The sheath may be made, for the most part, or even entirely, of filter material. The filter material may include any filter media or combination of filter materials that filters the secondary smoke. This includes adsorbents for physical adsorption. In this case, the sidestream smoke is bound to the filter material by intermolecular pulling action. Examples of sorbents include forms and combinations of fuller's earth, activated clay, bauxite, alumina, bone charcoal, decolorizing carbon, gas sorbent carbon, molecular sieve activated carbon, synthetic polymer sorbent, silica gel or molecular sieve. In one embodiment, the filter material may include predominantly activated carbon.

Also included is a filter material containing an additive for chemisorption of sidestream smoke. In this case, the sidestream smoke can chemically interact with the additive. Various prior art adsorbing methods for sidestream reducing cigarette wrapping materials and smoke filtration devices as accessories are adaptable in the filter sleeve of the present invention.

The filter material may be added to or bonded to the sheath host material, such as a polymer, ceramic or composite material. In one example, the sheath may be formed of an activated carbon porous paper or fabric that is lightweight and easily disposable after use, and is readily biodegradable. Some prior art on suitable activated carbon filter materials is disclosed later in this section.

The sheath may include at least one layer of material. In one embodiment, the filter material can be realized in a single layer of the sheath. In other embodiments, the sheath has an inner layer for filtering particulate matter,
An outer layer for filtering gaseous components of the sidestream smoke. Such a sheath may also entrap the vapor in either or both layers. In the third embodiment,
The sheath may include a porous outer wrap such as paper. This outer wrap is particularly useful for hiding the filter material used, preventing black ash from falling if some form of activated carbon material is used, and improving the look and / or feel of the sheath.

[0055] The sheath can be of sufficient porosity to provide the air required to burn the rod of smokable material when the rod of smokable material is properly held within the sheath. . In one embodiment, the sheath may be porous or air permeable. In other embodiments, perforations may be provided in the sheath wall to allow the passage of ambient air required for combustion. In a third embodiment, the sheath can include a combustible fill material. The filling material may render the sheath impermeable or low permeable to ambient air, and the porosity required for the combustion may be such that some of the rods of smokable material contained within the sheath are not filled. The burning destroys the corresponding portion of the fill material and is obtained by a process that renders the corresponding sheath portion to the porosity necessary to further burn the rod of smokable material. When the rod of smokable material in the sheath is ignited and the initial portion of the fill material is destroyed during the initial burn, the sheath has the porosity required to burn yet another portion of the rod of smokable material. To be obtained. By the burning of the rod of the smokable substance,
Still other portions of the fill material are destroyed, providing the porosity required for further burning. The above process can be continued until substantially all of the rod of smokable material has been consumed. The sheath body can be held substantially intact. The porous nature of the sheath also allows heat to diffuse through the sheath material to the surrounding environment.

The sheath can be adapted to be suitable for a rod of smokable material so that the required inhalation resistance, smoke quality and quantity, taste, burning characteristics, number of tobacco puffs, etc. can be achieved.

When the rod of smokable material is covered within the sheath, it is possible to prevent the sheath from being significantly damaged by burning of the rod of smokable material. This feature greatly limits the products of combustion and allows for proper filtration through the walls of the sheath. The informative sheath allows for visual confirmation of the limitations for both smokers and non-smokers, providing psychological comfort. In addition, this feature can improve the appearance of the sheath,
The sheath can be held in the hand after consumption of the smokable substance. Such sheaths can also be used to present health notes, product information, brand captions, and the like. In one embodiment, the sheath can be substantially non-flammable at or above the cigarette or cigar ignition temperature. In another embodiment, the sheath may include an outer filter layer and an inner layer for supporting a rod of smokable material. The inner layer may be a flame-retardant or flame-retardant or heat-releasing flame protection layer. In one example, the inner layer may include meshes, ribs or irregularities, and the like. In a variant, a non-flammable, flame-retardant or heat-releasing support may be provided on the rod of smokable substance. In this case, the support and the rod of smokable material can be attached together to the filter layer outside the sheath.

[0058] The filter sheath may be suitably rigid so that the contained smokable material does not bend after it has been completely consumed in the smoking process.
Such rigidity also allows for more robust handling of the article. This rigidity can be achieved by appropriately forming the sheath from a hard material or by providing a rigid support such as a laminate layer, a mesh, or a rib. The rigidity also leaves room for changing the shape of the article. Examples of suitable shape changes include flattening a portion of the outer surface to reduce the likelihood that the sheath will roll on an inclined surface.

A single, sufficiently air-permeable, non-flammable, suitably rigid filter layer is the preferred material for making the sheath. Such a layer can be provided in the form of a sheet, membrane, skin or film.

[0060] The cigarette or cigar can usually be wound with a wrapping material. The wrapping material has a first function of holding the smokable substance together and a second function of allowing ambient air to be substantially drawn through the burning end of the rod of the smokable substance. Fulfill. It should be noted that the filter sheath of the present invention can also hold the smokable substance together. Thus, when a cigarette, cigar or other similar smoking article is used with the filter sheath of the present invention, the cigarette, cigar or other similar smoking article may be provided with a wrapping material. It is not necessary.

The sheath may have a mouth side downstream with respect to the direction of the smoke flow. Various adaptations can be made, such as to facilitate attachment of the smokable substance to the sheath. As one example, the sheath may have a downstream open end for mounting through a rod of smokable material. In a second example, the sheath may have an upstream open end for mounting and / or igniting through a rod of smokable material. In a third example, a sheath may be formed by wrapping a sheath material around a rod of smokable material. In the fourth example,
A winding material may be stuck inside the sheath. Subsequently, a smokable substance is mounted inside the wrapping material.

[0062] The sheath may have an orifice to enable ignition of the rod of smokable material to be contained therein. Preferably, the orifice may be provided corresponding to the upstream portion of the rod of the smokable substance. The orifice may be provided with a door that closes after ignition of the smokable substance in the sheath. Suitable doors include flap doors, sliding doors, swinging doors, removable caps, slidable overlay sleeves, and the like.

In one embodiment, the sheath has an ignition surface that is capable of igniting a rod of smokable material contained within the sheath by a flame or heat source located on or near the ignition surface. May be suitable. The ignition surface can be made of a non-combustible or non-combustible material. This ignition surface can be appropriately provided on the upstream end portion of the sheath. It is also preferable that the ignition surface has a smoke filtering function so that the sidestream smoke passing through the ignition surface can be filtered before being discharged to the surroundings. The smoke filtration function can be present in a non-combustible or flame-retardant material or in another material that cooperates with the non-combustible or flame-retardant material. The ignition surface allows the smoker to ignite a smoking article contained within the filter sheath without having to open and close the ignition opening. The ignition surface may be retained in the ash produced by the burning of the smokable substance. Suitable materials for making the ignition surface include holes large enough to ignite a smokable substance held in the upstream end of the sheath and / or adapted to have thermal conductivity. , Non-combustible or flame-retardant fabric, paper,
Examples include metal, plastic or ceramic meshes.

A portion around the downstream end of the filter sheath may be wrapped with paper for forming a mouthpiece.

The at least one transparent or translucent portion is provided on the sheath so that the smoker looks at the rod of smokable substance contained therein so that he can know the stage of consumption of said rod of smokable substance. You may be able to do it.

The filter sheath according to any one or more of the combinations of the features described in detail above may be used for smoking such that the mainstream smoke outlet of the rod of smokable material corresponds to the open end of the sheath. One or more of the above-described filter sheaths overlying the rod of smokable material and overlying the rod of smokable material may be pre-loaded. Such a filter sheath pre-loaded with a rod of smokable material can be easily mass-produced in a mass production operation, thereby allowing the user to personally attach the rod of smokable material to the filter sheath. No more hassle.

A filter sheath according to any one or more combinations of the features described in detail above and a filter sleeve according to any one or more combinations of the features described in detail above May be provided together so that one open end of the sheath and a downstream portion of the filter sleeve are in fluid communication. Preferably, the filter sheath and filter sleeve are similar in circumferential dimension and are substantially coaxially aligned in fluid communication.

The generic filter smoking article comprises a filter sheath according to any one or more of the above-described features and a combination of one or more of the above-described features. A filter sleeve of any one of them can be provided. In this case, the filter sheath covers the rod of the smokable substance, so that the mainstream smoke outlet of the rod of the smokable substance and the downstream portion of the filter sleeve are in fluid communication. One or more of such generic filter smoking articles may be pre-loaded.

[0069] The filter sleeve and the rod of smokable material and / or the filter sheath can be connected in any conventional manner. The wrapping material may be wrapped around the junction of the filter sleeve with the rod or filter sheath of the smokable substance. The winding material is
Provided at a convenient location suitable for the smoker to hold the article during the smoking act. In one embodiment, the filter sheath and the filter sleeve may be of equal circumferential dimension and may be in communication and coaxially aligned. Comprehensive filter smoking articles can be easily mass produced in mass production operations. The size and shape of the generic filter smoking article can be any size and shape suitable for a rod of smoking material. When used with cigarettes or the like, the overall filter article has a total length of about 122 mm, an outer diameter of about 8 mm, and an upstream suction and discharge port diameter of about 5 mm, which can facilitate smoking. By making such dimensions,
The article can be somewhat similar to a conventional ballpoint pen without a cover and tip.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the present invention more understandable, seven specific embodiments formed according to the present invention will be described below by way of example. These examples are for illustrative purposes only, and are not to be construed as limiting the invention. Various combinations, changes, additions and deletions of technical features can be made without departing from the spirit and scope of the present invention.

Hereinafter, reference will be made to the accompanying drawings.

FIG. 1 is a longitudinal sectional view of one embodiment of a filter sleeve according to the present invention for filtering discharged smoke. FIG. 1A is a schematic view showing a three-dimensional shape of the filter sleeve. Filter sleeve (1)
Comprises a cylindrical sleeve (10). The elongated hollow portion is closed by a transverse wall (19a, 19b) towards the downstream end and also at the upstream end. At the downstream end, a slight protrusion (10a) of the sleeve (10) is retained. The entrance (17) is located at the downstream crossing wall (19).
A) is provided along the periphery of a), and receives inhaled smoke from smoking articles. The inlet (17) is in fluid communication with an outlet (18a) provided along the periphery of the upstream transverse wall (19b) by a plurality of tubular suction flues (13). The suction flue (13) runs longitudinally in the elongated hollow part of the sleeve (10). In addition to flowing smoke, the smoke stack (13) can also be a support for the wall of the sleeve (10). The upstream inlet (18b) is provided at the center of the upstream cross wall (19b) for receiving the discharged smoke. In this case, the exhaust smoke can flow along the exhaust flue (14) defined by the elongated hollow portion of the sleeve (10). The exhaled smoke is filtered through a filter material (15) realized in the wall (10) of the sleeve. The filtered air is discharged directly from the filter material (15) to the surrounding environment. A check valve (16) is provided immediately downstream of the upstream inlet (18b) along the discharge flue (14). The check valve (16) serves to prevent ambient air from flowing into and flowing into the discharge flue (14) when the air in the upstream portion (12) of the sleeve (10) is being sucked. Things. The check valve (16)
Is discharged by the upstream cross wall (19b).
4) is held inside. Said valve (16) can be adopted from existing valve systems.

FIG. 2 is a longitudinal sectional view of a second embodiment of the filter sleeve according to the present invention. FIG. 2A is a schematic view showing a three-dimensional shape of the filter sleeve. The filter sleeve (1) is
b) and is coaxially secured to the elongated hollow portion of the longer outer sleeve (10). The two sleeves have the same height at the upstream end, and the annular space (20) between the two sleeves has a ring-shaped transverse wall (19a, 19b) at both ends.
At the downstream end to provide a slight protrusion (10a) of the outer sleeve (10). The above protrusions (10
a) may be arranged in contact with the mainstream smoke outlet (71) of the smoking article (7), and the joint may be wound with a wrapping material (not shown). The downstream end of the sleeve (10) forms an inlet (17) for receiving inhaled smoke from the smoking article (7). The smoke is directed through a smoke stack (13) defined by an elongated hollow portion of the inner sleeve (10b) and the inner sleeve (10b).
b) an upstream outlet defined by the upstream open end /
It can be sucked through the inlet (18). The outlet / inlet (18) is also provided for receiving exhaled smoke. In this case, the discharge flue extending downstream from the outlet / inlet (18) directs the discharge smoke into the opening (2) formed in the first upstream part of the inner sleeve wall (10b).
1) and to a check valve system (16) provided in the first upstream portion of the annular space (20). The discharged smoke is filtered through a filter means (15) provided in a second intermediate portion of the annular space (20). The filtered air from the filter means (15) is discharged through a third upstream portion of the annular space (20) and passes through an opening (22) in the outer sleeve wall to the surrounding environment. Released.

FIG. 3 is a longitudinal sectional view of a third embodiment of the filter sleeve according to the present invention. FIG. 3A is a schematic diagram showing a three-dimensional shape of the filter sleeve. The filter sleeve (1) is
0), and the outer sleeve (10) has a downstream end inlet (17) adapted to receive inhaled smoke from the mainstream smoke outlet (71) of the smoking article (7). Upstream end exit /
An inlet (18) is provided for the suction of said smoke, which is carried through a smoke flue (13) substantially defined by an elongated hollow portion of a sleeve (10). The upstream outlet / inlet (18) is also provided for receiving the exhaled smoke. Inner sleeve (10
b) is coaxially fixed inside the outer sleeve (10), the annular space (20) being the inner sleeve (10b).
And an inner wall surface of the outer sleeve (10). The inner sleeve (10b)
Are radially extending tubes (14) having a closed downstream end.
a) held in place by the inner sleeve (10b)
Of the outer sleeve (10) is connected to an opening (22) formed in the wall of the outer sleeve (10). The inner sleeve (10b) and the elongated hollow portion of the tube (14a) are
The discharge flue of 0) is formed. Filter means (15)
Is provided at the center of the inner sleeve (10b). A non-return valve system (16) fixed in the upstream opening of the inner sleeve (10b) allows the smoke to be filtered out of the filter means (1).
5) is allowed, but substantially prevents backflow of ambient air into the discharge flue when the outlet / inlet (18) is being sucked. The filter sleeve (1) can be attached to the smoking article (7), which places the downstream part (11) end-to-end against the mainstream smoke outlet (71) of said smoking article (7). Then, this is performed by winding the joint portion with a winding material (not shown).

FIG. 4 is a longitudinal sectional view of one embodiment of a filter sleeve in communication with a smoking article according to the present invention. The filter sleeve (1) comprises an outer sleeve (10) made of activated carbon porous paper. A shorter inner sleeve (10b) is coaxially secured to the elongated hollow portion of the outer sleeve (10). The upstream ends of both sleeves are of the same height, and the annular space between the outer wall of the inner sleeve (10b) and the inner wall of the outer sleeve (10) has a ring-shaped transverse wall (19a) at its ends. , 19b), providing a slight protrusion (10a) of the outer sleeve (10) at the downstream end. An inlet (17) is defined at the downstream end of the inner sleeve (10b) and receives inhaled smoke. An outlet / inlet (18) is defined at the upstream end of the inner sleeve (10b) for directing the inhaled smoke and receiving the exhaled smoke.
The inner sleeve (10b) has a plurality of openings (2
3) is provided. The outer surface of the inner sleeve (10b) is covered with a thin film (24). The film (24) is perforated to form a flap (16) corresponding to the opening (23). The flap (16) is masculinely biased to close the opening (23) so that when the smoke is expelled to the outlet / inlet (18), the smoke is applied to the inner sleeve (10b). Be able to move along the elongated hollow part. This causes the flap (16) to move outwardly toward the outer sleeve (10), opening the opening (23) and allowing the exhaled smoke to pass through the opening (2).
3) to allow it to flow into the filter material (15) contained in the wall of the outer sleeve (10). The projection (10a) on the downstream side of the outer sleeve (10) is adjacent to the mainstream smoke outlet of the smoking article (7) and the joint is the wrapping (25)
Wound in. The upstream portion (1) of the outer sleeve (10)
2) is wrapped with mouthpiece paper (26).

The inner sleeve can be made of metal, ceramic, polymer or composite material as appropriate. Paper or plastics of low porosity or air-impermeable are particularly suitable. Suitable materials for making films and flaps include paper, plastic, rubber, and the like.

Some modifications that can be made to this embodiment are listed below.

(A) Instead of a flap, a diaphragm is used as a valve member.

(B) Position the opening only at the upstream end of the inner sleeve. In this case, the valve member may include a single cylindrical coaxial flap whose upstream end portion is affixed to the outer wall of the inner sleeve at a point upstream of the opening. A filter plug may be provided on the downstream portion of the elongated hollow portion of the inner sleeve to filter smoke.

(C) Position the opening only at the upstream end of the inner sleeve. In this case, a movable reed or ball valve member may be provided in the hollow portion of the inner sleeve so that when the smoking article is being sucked, it can be sucked in to close the opening. The inhaled smoke may be inhaled through a hole formed in the valve member. In this case, the valve member can also be used as a filter plug for filtering the suction smoke. In yet another variation, the smoke smoke is
The downstream portion of the inner sleeve may be suctioned through a bypass flue connecting the upstream portion of the inner sleeve.

(D) Position the opening only at the downstream end of the inner sleeve. In this case, the valve member may include a cylindrical coaxial flap whose downstream end is affixed to the inner wall of the outer sleeve.

(E) Use an inner sleeve whose outer diameter decreases toward the downstream end. In this case, the space of the gap for the operation of the valve and the discharged smoke can be increased toward the downstream end.

(F) Change the size of the opening. For example, the opening may increase toward the downstream end of the inner sleeve, or vice versa. The film can be attached to any side of the flap.

(G) Use an inner sleeve with a somewhat flat outer surface to facilitate opening and closing the valve flap.

(H) placing the valve flap in a crater, groove or depression formed in the outer wall of the inner sleeve;
This increases the height of the gap for the valve flap and allows it to open and close freely.

FIG. 5 is a longitudinal sectional view of one embodiment of the filter sheath according to the present invention. The filter sheath (3) comprises a sheath (30) made of non-combustible activated carbon porous paper which has sufficient porosity for air but is significantly impermeable to sidestream smoke. Have. The sheath (30) is adapted to overlap the sidestream smoke emission surface of the rod (7) of smokable material.

FIG. 6 is a longitudinal cross-sectional view of one embodiment of a filter sheath according to the present invention, wherein the filter sheath is preloaded on a rod of smokable material. FIG. 6A is a schematic diagram showing the three-dimensional shape of the orifice of the filter sheath and the sliding door. The filter sheath (3) comprises a sheath (30) made of non-combustible activated carbon porous paper, which has sufficient porosity for air but is significantly less permeable to sidestream smoke. It is permeable. The sheath (30) is overlaid on the sidestream smoke release surface of the rod (7) of smokable material, and the mainstream smoke outlet (71) of the rod (7) of smokable material is connected to the sheath (30). It corresponds to the downstream open end.
The sheath (30) has an orifice (31) with a sliding door (33) at the upstream end to enable ignition of the smokable substance to the rod (7). The portion around the junction between the sheath (30) and the filter mouthpiece (72) of the rod of smokable substance (7) is wrapped with mouthpiece paper (26).

FIG. 7 is a longitudinal sectional view of one embodiment of a comprehensive filter smoking article according to the present invention. The generic filter smoking article (5) comprises an activated carbon sheath (30) that is nonflammable and has sufficient porosity. The above sheath (3
0) overlies and overlaps the rod of smokeable substance (7), and the mainstream smoke outlet (71) of said rod of smokeable substance (7) is
It protrudes from the downstream open end on the mouth side of the sheath (30). The downstream open end of the sheath (30) is connected to the downstream projection (10) of the filter sleeve (1) described in FIG.
Adjacent to a), the mainstream smoke outlet (71) of the rod of smokable substance (7) is fitted into the downstream inlet of the sleeve (10). A winding material (23) is wound around the joint between the sheath (30) and the downstream projection (10a). In the upstream portion (12) of the sleeve (10), the paper (2)
6) is wound. Further, an ignition surface (32) is provided on the sheath (30). In this case, the sheath (3
The upstream open end of 0) is covered with a mesh made of non-combustible filter material. The mesh is adapted to ignite the rod of smokeable material (7) by a flame or heat source provided on or near the ignition surface (32).

[Brief description of the drawings]

FIG. 1 (a) is a longitudinal sectional view of one embodiment of a filter sleeve for filtering exhaled smoke according to the present invention. FIG. 1B is a schematic view showing the three-dimensional shape.

FIG. 2 (a) is a longitudinal sectional view of a second embodiment of the filter sleeve according to the present invention. FIG.
(B) is a schematic diagram showing the three-dimensional shape.

FIG. 3 (a) is a sectional view in the hand direction of a third embodiment of the filter sleeve according to the present invention. FIG.
(B) is a schematic diagram showing the three-dimensional shape.

FIG. 4 is a longitudinal cross-sectional view of one embodiment of a filter sleeve with a pre-loaded smoking article according to the present invention.

FIG. 5 is a longitudinal sectional view of one embodiment of a filter sheath according to the present invention.

FIG. 6 (a) is a longitudinal cross-sectional view of one embodiment of a filter sheath according to the present invention in which a rod of a smokable substance is pre-loaded. FIG. 6B is a schematic view showing a three-dimensional shape of the orifice and the sliding door of the filter sheath.

FIG. 7 is a longitudinal cross-sectional view of one embodiment of a generic filter smoking article according to the present invention.

Claims (36)

[Claims] A downstream portion (1) arranged in communication with the smoking article (7) and arranged to collect inhaled smoke from the smoking article (7).
1) an upstream portion (12) arranged for inhaling smoke and collecting exhaled smoke; and a downstream portion provided to allow the smoke to pass through and be sucked through the upstream portion (12). At least one suction flue (13) from (11) to the upstream part (12) and extending from the upstream part (12) to at least one outlet to the external environment, thereby forming the upstream part (12); At least one discharge flue (14) through which the discharged smoke collected by the filter passes and filters the filtered air to the external environment, and is disposed along at least one discharge flue (14). Filter means (15), which has a function of filtering the collected discharged smoke to generate filtered air, and making the filtered air substantially free of smoke; 7) is in fluid communication with the downstream portion (11) of the sleeve (10) A filter means (15) in which the discharge of filtered air to the surrounding environment when in the state is not significantly impeded by the smoking article (7); ) And a means (16) for substantially preventing backflow of ambient air through the exhaust flue (14); and a sleeve (10) comprising: Filter sleeve (1). 2. The downstream part (11) is provided with at least one downstream inlet (17), the downstream inlet (17) being provided to collect the smoke in the smoke stack (13). Filter sleeve (1) according to claim 1, wherein the filter sleeve (1) is provided. 3. An upstream part (12) is provided with at least one upstream outlet (18a), whereby the smoke passing through the suction flue (13) is passed through the upstream outlet (18a) to the human body. Filter sleeve (1) according to claim 1, which can be inhaled into the filter sleeve (1). 4. An upstream part (12) is provided with at least one upstream inlet (18b), said upstream inlet (18b).
2. The filter sleeve (1) according to claim 1, wherein b) is provided to collect the exhaled smoke in the upstream part (12). 5. At least one upstream outlet (18a) is provided in said upstream portion (12) for inhaling smoke passing through said smoke stack (13), and discharging smoke to said upstream portion (12). At least one upstream inlet (18b) is provided in the upstream portion (12) for collection, whereby the upstream outlet (18a) and the upstream inlet (18b) coincide. (1). 6. The filter sleeve (1) according to claim 1, wherein the discharge flue (14) exits the sleeve (10) via a sleeve wall. 7. The filter sleeve (1) according to claim 1, wherein part or all of the suction flue (13) and the discharge flue (14) coincide. 8. The filter sleeve (1) according to claim 1, wherein the filter means (15) comprises a filter material realized on at least a part of the wall of the sleeve (10). 9. The filter sleeve (1) according to claim 1, wherein the filter means (15) comprises a filter material realized in the wall of at least one discharge flue (14). 10. The filter sleeve (1) according to claim 1, wherein said filter means (15) is capable of passing a discharge stream at a substantially higher rate. 11. The filter sleeve (1) according to claim 1, wherein the filter means (15) is not replaceable in practical use. 12. The filter sleeve (1) according to claim 1, wherein the filter means (15) comprises any filter media or combination of filter materials that significantly filters secondary smoke. 13. The discharge of air after filtration to the surrounding environment by means of the wall of the sleeve (10) and / or the sleeve (1).
Filter sleeve (1) according to claim 1, made via the downstream end of (0). 14. The filter sleeve (1) according to claim 1, wherein said means (16) comprises a valve system provided along said discharge flue (14). 15. The means (16) comprising a sleeve (10).
A valve system provided outside of the valve, said valve system cooperating with said discharge flue (14) to substantially prevent backflow of ambient air through said discharge flue (14). Filter sleeve (1) according to claim 1, suitable for: 16. The device according to claim 16, wherein the means (16) comprises a sleeve (1).
0), the upstream outlet (18a) communicating with the suction flue (13) is provided in the special configuration of the upstream portion (12) so that the upstream outlet (18a) communicating with the discharge flue (14). The inlet (18b) is sufficiently distinguished from the upstream outlet (18b) without substantially sucking the upstream inlet (18b).
Filter sleeve (1) according to claim 1, capable of absorbing a). 17. The filter sleeve (1) according to claim 1, wherein a filter plug is provided along the suction flue (13) for filtering the suction smoke. 18. A valve assembly is provided along the suction flue (13) or outside the sleeve (10), said valve assembly cooperating with said suction flue (13) to transfer said smoke. 10. The filter sleeve (1) according to claim 8 or 9, adapted to be passed through a suction flue (13), but adapted to substantially prevent a discharge stream from passing through said suction flue (13). 19. The filter sleeve (1) according to claim 1, wherein the outer circumference of the sleeve (10) is not significantly greater than the outer circumference of the rod of the smoking article (7). 20. The filter sleeve (1) according to claim 1, wherein the sleeve (10) is substantially coaxially aligned in communication with a rod of the smoking article (7). 21. Fluid communication between a downstream portion (11) and the smoking article (7) connects the downstream portion (11) and a mainstream smoke outlet (71) of the smoking article (7). The filter sleeve (1) according to claim 1, provided via a tubular intermediate member. 22. A filter sleeve (1) according to any combination of claims 1 to 21. 23. Downstream portion (1) of said sleeve (10).
1) is in fluid communication with the mainstream smoke outlet (71) of said smoking article (7) such that one or more of such filter sleeves (1) having the smoking article (7) is pre-loaded. Item 1. A filter sleeve (1) according to one or a combination of items 1 to 21. 24. A sheath (30) arranged to cover a significant area of a sidestream smoke emission area of a rod of a smokable substance (7), the majority of said sheath (30) being a sidestream smoke. The sheath (30) has sufficient porosity to provide the air required to burn the rod of smokable material (7); A filter sheath (3) for filtering sidestream smoke, which is not significantly impaired by the burning of rods of possible substance (7). 25. The filter sheath (3) according to claim 24, wherein the sheath (30) is adapted to cover the entire sidestream smoke emission area of the rod of the smokable substance (7). 26. The filter sheath (3) of claim 24, wherein the filter material comprises any filter media or combination of filter materials that significantly filters secondary smoke. 27. The filter sheath of claim 24, wherein the sheath (30) includes an inner layer for filtering particulate matter and an outer layer for filtering gaseous components of sidestream smoke. (3). 28. The sheath (30) comprises a combustible filling material, the filling material making the sheath (30) impermeable to ambient air or low permeability and the porosity required for the combustion is reduced by the porosity. The burning of a part of the rod of the smokable substance (7) destroys the corresponding part of the filling material and replaces the corresponding sheath part with said smokable substance (7).
25. The filter sheath (3) according to claim 24, obtained by a process that brings the required porosity of the rods to further burning. 29. The filter sheath (3) according to claim 24, wherein said sheath (30) is substantially non-flammable. 30. The filter sheath (3) according to claim 24, wherein the sheath (30) comprises an outer filter layer and an inner layer for supporting a rod of a smokable substance (7). 31. The filter sheath (3) according to claim 24, wherein the sheath (30) includes an outer filter layer and an inner flame protection layer. 32. An orifice (3) in which said sheath (30) enables ignition of a rod of said smokable substance (7).
The filter sheath (3) according to claim 24, having 1). 33. The sheath (30) having an ignition surface (32).
Wherein the ignition surface (32) is capable of igniting the rod of the smokable substance (7) by a flame or heat source located on or near the ignition surface (32). The filter sheath (3) according to claim 24, wherein the filter sheath is provided. 34. A filter sheath (3) according to one or more of claims 24 to 34,
Mainstream smoke outlet (71) of rod of said smokable substance (7)
The sheath (30) covers the rod of the smokable substance (7) such that the sheath corresponds to the open end of the sheath (30), so that the filter sheath ( A filter sheath (3), wherein one or more of 3) is pre-loaded. 35. A filter sheath (3) according to one or more combinations of claims 24 to 34 and a filter sleeve (1) according to one or more combinations of claims 1 to 23, wherein said sheath One open end of (30) is connected to the downstream portion (1) of the sleeve (10).
A filter sheath (3) and a filter sleeve (1) provided in fluid communication with 1). 36. A filter sheath comprising a filter sheath (3) according to one or more combinations of claims 24 to 35 and a filter sleeve (1) according to one or more combinations of claims 1 to 23. (3) overlies the rod of smokable material (7) such that the mainstream smoke outlet (71) of the rod of smokable material (7) is in fluid communication with the downstream portion (11) of the filter sleeve (1). , Comprehensive filter smoking articles (5).