US3773053A

US3773053A - Cigarette with controlled smoking profile

Info

Publication number: US3773053A
Application number: US00220084A
Authority: US
Inventors: W Stephens
Original assignee: Philip Morris USA Inc
Current assignee: Philip Morris USA Inc
Priority date: 1972-01-24
Filing date: 1972-01-24
Publication date: 1973-11-20
Anticipated expiration: 1990-11-20
Also published as: ZA729000B; SU626679A3

Abstract

The smoking profile or delivery of particulate matter as a component of smoke in respect of each puff during the smoking of a cigarette is controlled by providing the paper wrapping enclosing the tobacco cylinder with one or more ventilation passages at either the inner or outer surface of the wrapper. The ventilation passages are provided by a strip of combustible material which is secured to the wrapping and has formed therein a number of grooves or channels, the grooves defining with the wrapping the respective ventilation passages. Blocking means are provided in the respective ventilation passages and prevent dilution air from entering the mouth end of the cigarette until a predetermined length of the cigarette has been smoked. The opening of the respective ventilation passages occurs at different times in correspondence to the increasingly higher levels of particulate matter produced as smoking proceeds, the increasing level of ventilation thereby provided controlling the smoking profile to flatten out the curve of particulate matter delivered with each puff.

Description

United States Patent [1 1 Stephens, Jr.

[ Nov. 20, 1973 CIGARETTE WITH CONTROLLED SMOKING PROFILE [75] Inventor: William K. Stephens, Jr.,

Mechanicsville, Va.

[73] Assignee: Philip Morris Incorporated, New

York, N.Y.

22 Filed: Jan. 24, 1972 21 Appl. No.: 220,084

[52] U.S. Cl. 131/9, 131/10 A, 131/15 B [51] Int. Cl. A24d 01/02 [58] Field of Search 131/9, 8 R, 10 A, 131/15 B, 10.3

[56] References Cited UNITED STATES PATENTS 3,606,892 9/1971 Wilson 131/9 X 2,667,170 l/l954 Lebert 131/9 3,511,247 5/1970 Tamol 131/9 X 2,349,551 5/1944 l-lelm.... 131/8 R X 3,162,199 12/1964 Moll 131/144 X FOREIGN PATENTS OR APPLICATIONS 401,174 11/1933 Great Britain 131/8 R Primary ExaminerWm. H. Grieb Assistant ExaminerJohn F. Pitrelli Attorney-Elmer R. Helferich et al.

[5 7 ABSTRACT The smoking profile or delivery of particulate matter as a component of smoke in respect of each puff during the smoking of a cigarette is controlled by providing the paper wrapping enclosing the tobacco cylinder with one or more ventilation passages at either the inner or outer surface of the wrapper. The ventilation passages are provided by a strip of combustible material which is secured to the wrapping and has formed therein a number of grooves or channels, the grooves defining with the wrapping the respective ventilation passages. Blocking means are provided in the respective ventilation passages and prevent dilution air from entering the month end of the cigarette until a predetermined length of the cigarette has been smoked. The opening of the respective ventilation passages occurs at different times in correspondence to the increasingly higher levels of particulate matter produced as smoking proceeds, the increasing level of ventilation thereby provided controlling the smoking profile to flatten out the curve of particulate matter delivered with each pufi.

21 Claims, 12 Drawing Figures Patented Nov. 20, 1973 3,773,053

3 Sheets-Sheet 1 FIG. 8

Patented Nov. 20, 1973 I5 Sheets-Sheet 2 FIG. 9

mg TPM PUFF NUMBER FIG. /0

CONTROL INTERNAL FLUTE mg TPM PUFF NUMBER Patented Nov. 20, 1973 mg TPM mg TPM 3 Sheets-Sheet 5 CONTROL X2 EXTERNAL FLUTES I I I I l I I 6 7 8 9 IO II l2 I3 PUFF NUMBER CONTROL EXTERNAL FLUTE I I l I I l I I l l I I 56789IO|II2I3 PUFF NUMBER CIGARETTE WITH CONTROLLED SMOKING PROFILE BACKGROUND OF THE INVENTION It is known to provide cigarettes with ventilation features which function during the course of smoking the cigarette to admit certain quantities of diluting streams of air for the purpose of effecting a certain concomitant reduction of the delivery of particulate matter in the smoke stream. Such ventilation preferably is made of more pronounced magnitude during the latter stage of smoking of the cigarette since it is in such latter smoking stage that the higher quantities of particulate matter are generated and hence delivered in the smoke stream. Representative of such known forms of cigarette ventilation are U.S. Pat. Nos. 2,992,647; 3,51 1,247 and 3,526,904. The aforementioned patents all disclose providing ventilation holes or apertures in the tobacco cylinder paper wrapping at specified locations and covering the apertures with a film or like barrier which is removed in advance of arrival of the buming coal at such locations. Removal of the barrier can be achieved in various ways, e.g., by melting of the barrier material at only slightly elevated temperatures, or by softening and disintegration of the barrier material under the influence of the components of the smoke. Such forms of ventilation described aforesaid are difficult to control when embodied in mass produced cigarettes. Variations in such factors as film thickness, molecular weight of the film substance, smoke temperature, moisture content of the tobacco in the cigarette being smoked and possibly the environment in which the smoking occurs can lead to precipitous melting, softening or disintegration of the barrier material, thus providing the cigarette with dilution characteristics which are not satisfactory in that there can be measurable variability of such characteristics from one cigarette to another. Since the salutary ends of providing dilution as a means for reducing particulate matter delivery should be effected in conjunction with the provision of acceptable taste and flavor. in the cigarette which is not subject to variation from one to another cigarette, it is desirable that a more easily controlled dilution system be employed in cigarettes manufactured on high speed cigarette making machines.

It is also possible to achieve ventilation of the cigarette without use of barrier means of the type described above by providing an inner sleeve in the cigarette between the tobacco cylinder and the tobacco cylinder paper wrapper thus to define ventilation courses through which air can enter once the coal of the cigarette has burned down to the beginning of the sleeve, such form of device being disclosed in US. Pat. No. 3,606,892. However, the transition from a noventilation to a full-ventilation condition which occurs with such type of cigarette ventilation is relatively abrupt, whereas if it is desired to provide certain flavor and taste enhancement, it is preferable to progressively increase ventilation concurrently with smoke particulate matter delivery increase.

SUMMARY OF THE PRESENT INVENTION The present invention is concerned with dilution or ventilation of a cigarette with streams of air in such manner as effectively controls the smoking profile of the cigarette, such smoking profile being represented by a plot of the total particulate matter delivered versus the number of puffs taken on the cigarette during smoking. The achievement of a relatively level delivery profile is made while at the same time a satisfying taste and flavor character is retained in the cigarette. In accordance with the present invention, a cigarette having a cylindrical paper wrapping of combustible material enclosing a cylinder of tobacco is provided at either the inner or outer side of such paper wrapping with a strip of combustible material having at least one elongated channel or groove therein, with the combustible material strip being secured to the wrapping such that the channel defines therewith at least one ventilation passage extending longitudinally of the wrapping in one direction toward outlet at the mouth end of the cigarette and in an opposite direction toward the smoking end of the cigarette. An unblockable blocking means is provided in the ventilation passage at a location spaced a predetermined distance from the smoking end of the cigarette with the blocking means being of a type which is rendered unblocked responsive to smoking of the article. When the tobacco cylinder has been smoked to the location of the blocking means and the latter unblocked, a ventilating stream of air is drawn through the ventilation passage concurrently with puffing of the cigarette and functions to dilute the smoke stream lessening the delivery of total particulate matter in the smoke stream. The strip of combustible material can be made from any suitable material form such as stiffened paper and be adhesively secured to the cylinderical paper wrapping enclosing the tobacco cylinder. The blocking means can be provided in various ways, as for example, blocking can be effected with a solid material disposed in the passage which melts or disintegrates responsive to the presence of heat from the burning coal of the smoking article, or the blocking means can be provided by forming a crimp in the strip material of each channel in the combustible strip material. When the cigarette has been smoked to the location of the crimp in the channel, the crimp burns away opening the ventilation passage to atmosphere.

In accordance with the invention, the ventilation passages can be provided by one or more relatively thin tubes of combustible material secured to the tobacco cylinder wrapping, such tubes embodying blocking means in the same manner above described.

The present invention is applicable to both filter type and non-filter type cigarettes. When embodied in nonfilter type cigarettes, the ventilation passage outlets at the end of the tobacco cylinder. On the other hand when used in a filter type cigarette, the ventilation passages may outlet at the mouth end of the cigarette to the filter plug or to suitable ventilation passages fonned around the periphery of a mouthpiece if such is provided in conjunction with or in addition to the filter plug.

The invention accordingly comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS A fuller understanding of the nature and objects of the present invention will be had from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a longitudinal side view of a cigarette provided with a number of ventilation passages formed at the inner side of the tobacco cylinder paper wrapping, formed by the stiffened paper strip depicted in FIGS. 7 and 8, the respective passages being blocked at different distances from the smoking end of the cigarette, the ventilation passages at the mouth end of the cigarette outletting directly to a filter plug, certain portions of the cigarette being cut away for purposes of clarity of depiction of the cigarette construction.

FIG. 2 is a sectional view as taken along the line Il-II in FIG. 1.

FIG. 3 is a longitudinal side view of a cigarette similar to FIG. 1 except that the ventilation passages are formed at the outer side of the tobacco cylinder wrapping, with such passages outletting at the mouth end of the cigarette to communication with peripheral grooves formed in a tubular mouthpiece, access to said grooves being through apertures provided in a conventional air-impervious mouth-piece wrap.

FIG. 4 is a sectional view on enlarged scale as taken along the line IV-IV in FIG. 3.

FIG. 5 is a longitudinal side view of a cigarette embodying one or more tubes therein which are secured to the tobacco cylinder wrapping to provide ventilation passages, the tubes being secured to the inner surface of the wrapping.

FIG. 6 is a sectional view on slightly enlarged scaie as taken along the line VI-VI in FIG. 5.

FIG. 7 is a plan view of a longitudinal section of a conventional cigarette wrapping paper to which has been adhesively secured a strip of stifiened paper, the stiffened paper having a number of longitudinally extending grooves formed therein which together with the paper wrapping define corresponding ventilation passages in the cigarettes depicted in FIGS. 1-4.

FIG. 8 is a section view as taken along the line VIII- VIII in FIG. 7.

FIGS. 9 and 10 are graphs depicting the smoking profile of cigarettes provided, respectively, with two and one internal flutes and as compared with nonventilated cigarettes.

FIGS. 11 and 12 depict, respectively, the delivery profile plotted graphically of two cigarettes provided with two and one external flutes or ventilation passages as compared with non-ventilated control cigarettes.

Throughout the following description like reference numerals are used to denote like parts in the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is concerned generally with the reduction in the quantity of total particulate matter (TPM) delivered during the smoking of a cigarette, and specifically ventilating a cigarette in such manner as to flatten out the curve obtained by plotting TPM versus puff count. The invention is applicable to use in cigarettes of both non-filter and filter types, including filter and non-filter type cigarettes fitted with mouthpieces. As is known, the introduction of diluting or ventilating streams of air into a cigarette during the course of the smoking of the same contributes to a reduction in the quantity of total particulate matter delivered to the smokers mouth with each puff. It is also known further that the quantity of total particulate matter delivered per puff increases substantially in the latter stages of smoking of the cigarette. Accordingly, it is desirable that means for levelling off the cigarette delivery profile be embodied in cigarettes. Such means desirably function to increase dilution commensurate with the development of increased levels of total particulate matter in the cigarette.

Referring now to FIG. 1, there is depicted a cigarette 10 constructed in accordance with the principles of the present invention and wherein ventilation passages 12a, 12b and 12c are provided at the inner surface of the tobacco cylinder paper wrapping 14. The cigarette 10 includes an elongated cylinder of shredded tobacco 16 which in usual manner is enclosed in a cylindrical wrapping of paper 14, the latter being the conventional combustible type paper wrapping used in making cigarettes. Disposed at one end of the wrapped tobacco cylinder and defining therewith a mouth end for the cigarette, is a filter plug 18 of suitable filtering material such as cellulose acetate, which in common practice is enclosed by a paper wrapping 20, the wrapped plug in turn being joined to the wrapped tobacco cylinder by means of an overtip 22 or combining wrap which commonly is a thickened relatively smooth air-impervious paper. The opposite end of the cigarette constitutes the smoking end from whence smoking is initiated. Secured to the inner surface of the tobacco cylinder wrapping 14 is an elongated strip 24 of a suitable combustible material, as for example, a stiffened paper. The stiffened paper strip 24 preferably is secured to the inner surface of the cylindrical wrapping 14 by means of any suitable hot-melt or like adhesive 26, the strip 24 being of suitable length, e.g., coextensive with wrapping 14. The combustible strip 24 of stiffened paper provides the structure with which the ventilation passages 12a, 12b and can be formed at the inner surface of the wrapping 14. For this purpose, the stiffened paper may be provided with a corresponding number of longitudinally directed grooves 28 which can be formed in the combustible strip in any suitable manner, as for example, by folding of the stiffened paper along a longitudinal crease line or by corrugating the same in a roller set. While the ventilation passages defined by the grooves 28 and the tobacco cylinder wrapping 14 are depicted as being coextensive in length with the tobacco cylinder, it is not necessary that such grooves extend the full length of the wrapping 14. Such grooves can be made of lesser lengths in correspondence to the location at which admission of dilution or ventilating air streams to the cigarette should enter to compensate for the increasing level of particulate matter delivered during the course of puffing of the cigarette. Within each

ventilation passage

12a, 12b, 120, there is provided a suitable removable or unblockable blocking means 30, arranged in such passages in the manner depicted in FIG. 1 and at different distances from the smoking end of the cigarette. In this manner the respective ventilation passages will upon removal or unblocking of the blocking means, open at correspondingly later times during the course of the smoking of the cigarette.

The unblockable blocking means 30 can be provided in various ways. For example, such blocking means can be provided by crimping of the material defining the groove in the combustible strip 24 to an extent that an air-impervious blockage of the passage is created. On the other hand, a suitable solid material can be disposed in each

ventilation passage

12a, 12b, 120 at the requisite predetermined distance from the smoking end of the cigarette. Solid components suitable for functioning as blocking means include heat disintegratable as well as fusible type materials including various forms of waxes. While the unblockable blocking means may comprise suitable disintegratable or fusible components, it is not necessary that in fact the latter be consumed or changed in state by reason of the advance of the heated coal to the location of the blocking means 30 during the course of smoking, since the combustible material encircling the blocking means may be consumed during the course of smoking and while the blocking means may remain following the arrival and passage of the burning coal beyond such blocking means location, the ventilation passage downstream of such locations will be open to admit ventilating or dilution air.

The positioning of the blocking means 30 at predetermined locations from the smoking end of the cigarette are in accordance with the requirements for levelling the profile delivery of the cigarette. Accordingly, such positioning can vary. For example, the first blocking means may be located a distance approximately 25 mm. from the smoking end of the article. to admit first streams of dilution air to the ventilation passage 12a, which is sufficient to maintain a relatively flattened particulate matter delivery profile for the cigarette during the early stages of smoking since such particulate matter levels are not particularly excessive at that time. The second ventilation passage 12b can be designed to open when the cigarette has been smoked a distance of 40 mm. from the smoking end and accordingly, the blocking means is placed at such location. Similarly, the blocking means in the third ventilation passage 120 is positioned at somewhat a greater distance, as for example, 65 mm. from the smoking end. In this manner the

respective ventilation passages

12a, 12 b, 120 open successively in accordance with the need for the delivery of dilution or ventilation air to maintain the particulate matter delivery at intended levels. It will be apparent that following opening of the third ventilation passage 12c, all three ventilation passages 12a-l 2c are employed for delivering dilution or ventilation air to the mouth end of the cigarette and for this purpose, the ventilation passages in one direction extend to the mouth end of the cigarette where they outlet directly to the smokers mouth in the case of a non-filter type cigarette, or to the filter of a filter type cigarette or the mouthpiece of the cigarette if such device is employed.

FIGS. 3 and 4 show a somewhat different embodiment of cigarette 110 wherein the ventilation passages 112a, ll2b and 112s rather than being disposed at the inner side of the tobacco cylinder wrapping 114 adjacent the tobacco filler 116 are located on the outer surface thereof. In the cigarette 110 depicted in FIGS. 3 and 4, the ventilation passages are provided by means of a strip of combustible material 124 which is adhesively secured to the outer surface of the tobacco cylinder wrapping 114 with the blocking means 130 being provided in the same fashion as in the cigarette shown in FIG. 1.

In the cigarette 110, the same is illustrated as being a type which is provided with a mouthpiece at the mouth end. The mouthpiece 140 comprises a cylindrical thermoplastic component which has a number of axially directed flutes 142 formed at the periphery thereof in an encircling course around the mouthpiece extending axially thereof in the fashion depicted in US.

Pat. No. 3,511,247 and providing axial flow courses at the mouthpiece periphery. The thermoplastic mouthpiece in turn is enclosed by a cylindrical wrapping 144 of an air-impervious paper which has a number of apertures extending around the periphery thereof as at 146. The mouthpiece 140 and its air-impervious wrapping 144 in turn are secured as a unit to the tobacco cylinder by means of an overtip 148 in conventional manner.

The ventilation passages 112a, 1l2b and 112C formed at the outer side of the tobacco cylinder wrapping 14 extend longitudinally of the latter, and underlay the overtip wrapping 148 so that outlet from such passages at the mouth end of the cigarette is beneath the overtip 148. Thus, the passages 1120, 112b, 112:. are placed in communication with the apertures 146 in the air-impervious paper 144 and consequently are in communication with the longitudinal passages 150 in the plastic mouthpiece 140 defined by the flutes 142 and wrapping 144. In the latter manner, any dilution air or ventilating stream drawn through the passages 1 12a, 1l2b and 1120 are conveyed to the smokers mouth during the course of smoking.

FIGS. 7 and 8 depict a length drawn from a continuous stock of cigarette wrapping 14 which can be provided with ventilation passage defining means in accordance with the principles of the present invention. Thus, the strip of wrapping 14 has adhesively secured thereto a strip of stiffened or similar texture paper 24 such as glassine which is provided with a number of longitudinal grooves 28 in correspondence to the number of ventilating

passages

12a, 12b, 120 which are to be provided in the cigarettes. The longitudinal grooves 28 can be formed as indicated earlier in various ways in the stifi'ened paper, for example, the paper can be folded along longitudinal fold lines to produce the grooves therein which face away from the paper wrapping 14 when attached thereto to define therewith the respective ventilation passages, or such grooves can be formed by an embossing operation in suitable embossing equipment.

FIGS. 5 and 6 depict a further embodiment of cigarette 200 made in accordance with the principles of the present invention. The cigarette 200 includes a conventional cylindrical paper wrapping 214 enclosing a cylinder of tobacco 216 and provided at the mouth end with a filter unit depicted generally at 222. Ventilation passages 212a, 212b and 212c are provided at either the inner or outer surface of the wrapping 214, such passages being formed by elongated thin-walled tubes or hollow cylinders 213 of a combustible material. Such tubes 213 can be formed in any convenient manner, e. g., from rolled paper and are secured to the wrapping 214 by means of suitable adhesive, e.g., a hot melt type. Further, each tube 213 is provided at a location along the length thereof with removable blocking means 230 such as a crimp of the tube material to prevent flow through the respective passage until the cigarette has been smoked to a predetermined length.

EXAMPLE 1 Lengths of glassine paper were coated at one side with a thin layer of heat-sealing adhesive and then were folded so that two longitudinal flutes were raised toward the uncoated side providing correspondingly two grooves facing the coated side. Each piece of glassine paper then was heat-sealed to conventional cigarette wrapper paper with a heating iron. Each groove was crimped flat at one point with the heated iron, to block the flow course or passage defined by the flute and cigarette wrapper paper. Cigarette filler was placed on the paper on the fluted side (to provide internal ven tilation passages) and cigarette rods were rolled by hand. These rods were cut to 65 mm. length and attached to 20 mm. cellulose acetate filter plugs as used on commerical cigarettes. The attachment was such that the blocks in the respective passages were approximately 25 and 45 mm. from the lighting or smoking end of the cigarettes.

These cigarettes were smoked on a machine capable of separating the delivery from each puff (a puff-bypuff" smoking machine, e.g., of the type disclosed in US. Pat. No. 3,433,054). Control cigarettes were made from the same components but without the ventilation passages and also were smoked. Comparative TPM results are tabulated in Table l and shown graphically in FIG. 9. In FIG. 9, the vertical bars indicate the times at which the ventilation passages appear to be opening and also the times at which the ventilation starts to become insufficient to counteract the trend toward higher delivery. It will be seen that the cigarettes ventilated according to the present invention do not deliver more TPM than the initial puff of the control cigarettes until the final two putts (Nos. 14 and 15) of the former. The TPM delivery of the control cigarettes are appreciably higher (at least 10 percent) for all but one puff after the fourth.

TABLE I Puff-by-Puff TPM Delivery: Two Internal Flutes TPM, mg. Puff No Fluted Cig. Control 1 1.5 1.7 2 1.5 1.8 3 1.1 1.6 4 1.4 1.8 5 1.7 1.9 6 1.6 1.9 7 1.2 1.9 8 1.1 1.8 9 1.4 1.9 10 1.7 2.2 11 1.3 2.3 12 1.4 1.9 13 1.8 2.7 14 2.3 2.8 15 2.3 2.7

EXAMPLE 2 Glassine paper coated with adhesive at one side was folded to form longitudinal flutes and attached to cigarette wrapper paper as in Example 1, each flute being crimped at one point to block the ventilation passage formed therewith. The dimensions of the passage were slightly larger than in Example 1, but still less than 2 mm. square. Cigarette filler was placed on the paper on the side opposite the flutes (to provide external ventilation passages) and cigarette rods were rolled. These rods were cut to 65 mm. and attached to mm. filter plugs (acetate) enclosed in a fluted mouthpiece which in turn were covered with tube wrapper having a double row of vent holes encircling the tubes. The attachment of the rods was made with overtip paper mm.) in such a way that the flutes defining the ventilation passages were somewhat flattened but not closed off, while the overtip area outside such flutes was pressed against the wrap to prevent leaks. Blocks were approximately 30 and 45 mm. from the lighting end, respectively. Control cigarettes were hand made as in Example 1, without glassine flutes. Puff-by-puff machine smoking gave delivery profiles as shown in FIG. 11. The levelling effect of the ventilation flutes is evident after the seventh puff.

EXAMPLE 3 Experimental cigarettes were made as in Example I, but with only one ventilation passage formed with the attached combustible strip. This was blocked approximately 30 mm. from the lighting end of the cigarette. Control cigarettes, identical in all respects but lacking the ventilation passage, also were made. The comparative delivery profiles are shown in FIG. 10 from puffby-puff machine smoking. The single ventilation passage gives predictable ventilation and while it does not level the profile as well as two such passages, there is a noticeable diminution of TPM delivery as compared with the control.

EXAMPLE 4 Externally fluted cigarettes were made as in Example 2, but with one rather than two flutes; attachment to the filter plug was made in the same way. The block was about 30 mm. from the lighting end. Control cigarettes were prepared as for Example 2. The results from machine smoking show (FIG. 12) a maximum 15 percent increase of TPM delivery over that for the initial control puff, until the last two puffs (Nos. 11 and 12) for the fluted cigarette.

While the degree of control is less than was obtained with two flutes (Example 2), a discernible decrease of TPM delivery as compared with the control is achieved.

While the present invention has been described in terms pertaining to cigarettes, it will be understood that it has broader applicability to all kinds of smoking articles, including cigarillos and the like.

While there is above disclosed but some embodiments of the ventilation type cigarette with controlled delivery profile, it is possible to produce still other embodiments without departing from the scope of the inventive concept herein disclosed, and accordingly, it should be understood that all matter contained in the above description and accompanying drawings should be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. In an elongated smoking article which includes a cylinder of tobacco, and a cylindrical wrapping of combustible material closely enclosing said tobacco cylinder and being longitudinally coextensive with said tobacco cylinder, said smoking article having opposite ends constituting, respectively, a mouth end and a smoking end, a strip of combustible material having a plurality of separate elongated channels formed therein secured to said wrapping, said channels defining with said wrapping a corresponding plurality of separate ventilation passages extending longitudinally of said wrapping, said ventilation passages extending in one direction to outlet at the mouth end of said article and in an opposite direction toward the smoking end of said article, unblockable blocking means in each ventilation passage at a location spaced a predetermined distance from the smoking end of said article, the blocking means in each ventilation passage being spaced at a predetermined distance from the smoking end of said article which is different than the spacing of the blocking means in any other ventilation passage from said smoking end, said blocking means being rendered unblocked responsive to smoking of said article, said ventilation passages being communicated with atmosphere when said tobacco cylinder has been smoked to the location of the blocking means therein whereby ventilating streams of air are thereafter drawn through said ventilation passages concurrently with puffing of said article during continued smoking of the same.

2. The smoking article of claim 1 wherein said cylindrical wrapping has a generally smooth inner surface, said strip of combustible material being secured to said smooth inner surface.

3. The smoking article of claim 1 wherein said cylindrical wrapping has a generally smooth outer surface, said strip of combustible material being secured to said smooth outer surface. I

4. The smoking article of claim 1 wherein said strip of combustible material and the elongated channels therein are longitudinally coextensive with said cylindrical wrapping.

5. The smoking article of claim 1 wherein said strip of combustible material and the elongated channels therein extend longitudinally of said cylindrical wrapping from the mouth end of said article in the direction of the smoking end of said article a distance which is greater than the distance at which the blocking means in each is disposed from said mouth end.

6. The smoking article of claim 5, wherein said blocking means comprises a crimp formed in the strip material of each channel in said strip of combustible material.

7. The smoking article of claim 5 wherein said blocking means comprises a solid material disposed in pas sage blocking disposition in each passage and is selected from one of heat meltable and heat disintegratable materials.

8. The smoking article of claim 1 wherein said strip of combustible material and the elongated channel therein extend longitudinally of said cylindrical wrapping from the mouth end of said article in the direction of the smoking end of said article a predetermined distance, said channel merging with said wrapping at said predetermined distance to provide said blocking means.

9. The smoking article of claim 1 wherein the elongated channels formed in said strip of combustible material are substantially arcuate in transverse section configuration.

10. The smoking article of claim 1 wherein said strip of combustible material is a stiffened paper, said strip being adhesively secured to said cylindrical wrapping.

11. The smoking article of claim wherein said strip of combustible material is glassine paper.

12. The smoking article of claim 1 wherein the plurality of channels formed in said strip of combustible material extend longitudinally of said strip from the mouth end of said article in the direction of the smoking end of said article but terminate at locations spaced from said smoking end, the terminus of each channel being at a distance from said smoking end different than that of any other channel, the terminus of each channel comprising the blocking means of the ventilation passage associated therewith.

13. A ventilation type cigarette comprising an elongated cylinder of shredded tobacco, a cylindrical wrapping of combustible material closely enclosing said tobacco cylinder and being longitudinally coextensive with said tobacco cylinder, means disposed at one end of said wrapping enclosed tobacco cylinder providing a mouthpiece in said cigarette, said mouthpice having at least one flow through course extending therethrough, a strip of combustible material having a plurality of separate elongated channels formed therein secured to said wrapping, said channels defining with said wrapping a corresponding plurality of separate ventilation passages extending longitudinally of said wrapping and secured to said wrapping, said ventilation passages extending in one direction to outlet at said one end of said wrapping enclosed tobacco cylinder and being in communication with the flow through course in said mouthpiece, said ventilation passages extending in an opposite direction toward the other end of said tobacco cylinder, unblockable blocking means in each ventilation passage disposed therein at a location spaced a predetermined distance from said other end of said tobacco cylinder, the blocking means in each ventilation passage being spaced at a predetermined distance from the smoking end of said article which is different than the spacing of the blocking means in any other ventilation passage from said smoking end, said blocking means being rendered unblocked responsive to smoking of said cigarette, said ventilation passages being communicated with atmosphere when said tobacco cylinder has been smoked to the location of the blocking means therein whereby ventilating streams of air are thereafter drawn through said ventilation passages and said mouthpiece flow through course concurrently with puffing of said article during continued smoking of the same.

14. In an elongated smoking article which includes a cylinder of tobacco, and a cylindrical wrapping of combustible material closely enclosing said tobacco cylinder and being longitudinally coextensive with said tobacco cylinder, said smoking article having opposite ends constituting, respectively, a mouth end and a smoking end, means forming a plurality of separate ventilation passages extending longitudinally of said wrapping and secured to said wrapping, said ventilation passages extending in one direction to outlet at the mouth end of said article and in anopposite direction toward the smoking end of said article, unblockable blocking means in each ventilation passage at a location spaced a predetermined distance from the smoking end of said article, the blocking means in each ventilation passage being spaced at a predetermined. distance from the smoking end of said article which is different than the spacing of the blocking means in any other ventilation passage from said smoking end, said blocking means being rendered unblocked responsive to smoking of said article, said ventilation passages being communicated with atmosphere when said tobacco cylinder has been smoked to the location of said blocking means whereby ventilating streams of air are thereafter drawn through said ventilation passages concurrently with puffing of said article during continued smoking of the same.

15. The smoking article of claim 1 wherein said cylindrical wrapping has generally smooth inner and outer surfaces, the means forming said ventilation passage comprising a tube of combustible material secured to one of said surfaces.

16. The smoking article of claim 15 wherein said tube of combustible material is longitudinally coextensive with said cylindrical wrapping.

said passage.

20. The smoking article of claim 19 wherein said solid material is one which melts responsive to the presence of heat from the burning coal of the smoking article during smoking of the same.

21. The smoking article of claim 15 wherein said tube of combustible material is a paper, said tube being adhesively secured to said cylindrical wrapping.

Claims

3. The smoking article of claim 1 wherein said cylindrical wrapping has a generally smooth outer surface, said strip of combustible material being secured to said smooth outer surface.

7. The smoking article of claim 5 wherein said blocking means comprises a solid material disposed in passage blocking disposition in each passage and is selected from one of heat meltable and heat disintegratable materials.

11. The smoking article of claim 10 wherein said strip of combustible material is glassine paper.

14. In an elongated smoking article which includes a cylinder of tobacco, and a cylindrical wrapping of combustible material closely enclosing said tobacco cylinder and being longitudinally coextensive with said tobacco cylinder, said smoking article having opposite ends constituting, respectively, a mouth end and a smoking end, means forming a plurality of separate ventilation passages extending longitudinally of said wrapping and secured to said wrapping, said ventilation passages extending in one direction to outlet at the mouth end of said article and in an opposite direction toward the smoking end of said article, unblockable blocking means in each ventilation passage at a location spaced a predetermined distance from the smoking end of said article, the blocking means in each ventilation passage being spaced at a predetermined distance from the smoking end of said article which is different than the spacing of the blocking means in any other ventilation passage from said smoking end, said blocking means being rendered unblocked responsive to smoking of said article, said ventilation passages being communicated with atmosphere when said tobacco cylinder has been smoked to the location of said blocking means whereby ventilating streams of air are thereafter drawn through said ventilation passages concurrently with puffing of said article during continued smoking of the same.

17. The smoking article of claim 15 wherein said tube of combustible material extends longitudinally of said cylindriCal wrapping from the mouth end of said article in the direction of the smoking end of said article a distance which is greater than the distance at which said blocking means is disposed from said mouth end.

18. The smoking article of claim 17, wherein said blocking means comprises a crimp formed in said tube.

19. The smoking article of claim 17 wherein said blocking means comprises a solid material disposed in said passage.