MXPA98001885A - Wrapping of an article for smoking and manufacturing method of the same to control the proclivity or propension to the ignition of an article for fu - Google Patents

Abstract

The present invention relates to an enclosure of the smoking article having improved proclivity or propensity to ignition characteristics, including discrete areas of an outer circumferential surface of the treated casing with a non-aqueous solution of a cellulose polymer or soluble cellulose, solvent, dissolved in a non-aqueous solvent. The solution also includes a non-reactive particulate inorganic filler, suspended in solution per percent by weight of solution. The solution is applied in discrete areas such as bands or configurations that cause the reduced permeability of the treated areas within a range of adequate permeability to reduce the ignition proclivity. A method for producing an article wrapping for smoking having improved proclivity or propensity to ignition characteristics as described is also provided.

Description

ENVELOPE OF AN ARTICLE FOR SMOKING AND METHOD OF MANUFACTURE OF THE SAME TO CONTROL THE PROCLIVITY OR PROPENSION TO THE IGNITION OF AN ARTICLE TO SMOKE FIELD OF THE INVENTION The present invention relates to a wrapping composition of the smoking article to significantly reduce the proclivity or propensity of ignition of the smoking article, and to a method of preparing the wrapping composition of the smoking article. The invention particularly relates to an improved wrapping paper for cigarettes wherein the cigarettes tend to self-extinguish if they are set aside or dropped into a flammable substrate before the ignition of the substrate.

BACKGROUND OF THE INVENTION There is an industry-referenced activity for producing cigarettes having wrappers that reduce the ignition proclivity of the smoking article, in other words the tendency of the smoking article causes ignition of surfaces that come into contact with the smoking article on. They have REF .: 27055 made reports of fires attributed to the burning of cigarettes that come in contact with combustible materials. U justifiable interest exists in the industry to reduce the tendency of cigarettes, or other smoking items, that burn surfaces and materials used in fixtures or furniture, bedding, and likewise during contact. Therefore, a desirable feature of smoking articles, particularly cigarettes, is that they are self-extinguishing when dropped or set aside in a state of free combustion on combustible materials. It has been recognized in the long term in the industry that cigarette wrapping has a significant influence on the characteristics of smoldering or smoldering of the cigarette. In this regard, several attempts have been made in the art to alter or modify cigarette wrappers to achieve the desired tendency of the cigarette to self-extinguish or self-extinguish, or to reduce the characteristics of the cigarettes' propensity or propensity for ignition. For example, it is known in the art to treat bands or other areas of the cigarette paper to reduce the air permeability within the treated areas. It is known from US Pat. No. 4,452,259 to define at least one circumferential charge in the wrapping of a smoking article which will hopefully cause the smoking article to be extinguished or quenched under Free Combustion conditions. it is formed by applying a liquid or composite substance to the cigarette paper which has a liquid form at a temperature ranging from about 100 ° C to 200 ° C. This reference teaches that, when the burning cone of the cigarette becomes In contact with the web, a film is formed on the cigarette paper when the substance changes to the liquid form which substantially restricts the flow of air to the combustion mineral coal.National Patent No. 4,945,932 teaches another method for providing areas of combustion. Decreased air permeability that causes the cigarette to self-extinguish or self-extinguish such as burning without flames or burning the cigarette in the as areas of reduced permeability. The '932 patent teaches forming shaped or annular zones in the paper of the cigarette in the form of multiple paper canes, for example, by the use of a calendar of embossing.

U.S. Patent No. 4,077,414 discloses the use of printed webs of material on cigarette paper to control the burning rate of the cigarette. Although this reference is not particularly directed to the ignition proclivity, it teaches to provide relatively narrow low porosity bands throughout the cigarette. The bands are formed by applying a gel-forming substance to the paper by painting, printing, or other coating techniques. The reference teaches that preferred gel-forming substances are those that form gels in water, such as gelatin, alginates, methyl cellulose, methyl ethyl cellulose and gums. Substances insclubies in water such as lacquers and varnishes can also be used in an organic solvent. U.S. Patent No. 4,889,145 is another reference that teaches providing areas of reduced porosity throughout the cigarette by applying a discontinuous coating of a porosity reducing composition. This reference is not particularly related to the ignition proclivity of the smoking or smoking article, but controlling the puff or puff count and tar released from the smoking article. This reference also teaches to include a burn or ob-promoter for the coating or disk areas. Several other _ applications and processes to reduce the proclivity to the ignition of a cigarette are know as, for example, by the Patent North American No. 4,453,553; the North American Patent No. 4,480,650; US Patent No. -_, i _ < _ /,. , -i _ »_ /, / _j < _" , _ to.

P e e No samß i ana No. 4,715,345; US 10 Patent No. 2,666,437; U.S. Patent No. 4,622,983; and European Patent Application 0 559 300 82. Although, as described in the references identified above, it has been known in the x_ _> g _ _ _ _. The risk of ignition of cigarettes by defining discrete areas of reduced porosity or air permeability over the length of the cigarette, the prior art has not provided an economically viable method of producing such cigarettes on a commercial scale Cigarettes are produced in relatively high-speed commercial processes and any process or process of ignition 25 should be as pleasant as the process. manufacture of -_- x- -J axx - _ x., _, d _ x. _. cri ^ "x ^ ua. ua ü ^ cm _ / ._. ex, O S J x S L Tiita S and processes known in the art have been: r.a: ep-5i_les with respect to this. For example, the known processes are not compatible with conventional high speed printing techniques, to apply the porosity reduction solutions to the cigarette wrappers in a commercial operation at high speed. Attempts have been made for a] - / x. x. -_- ci x. or? u-xv- J u uoao ex xao cu 'wx-uxao ucx cigarette, but such attempts have not been successful.Water solutions significantly reduce the strength of the paper and also cause the paper to crease or crumple In the coated areas Cigarettes made with these casings have a non-uniform and unattractive external surface X -...? c?.? -.,? - yj 4L1C _ "_: ?? -_; v_ '_; - x.?_c ?, * _: .-- a? c? _ v - "-! - \ _ / - The resulting pattern for manufacturing a wrapping of the smoking article wherein a non-aqueous film-forming solution is applied to the cigarette paper in discrete bands or areas by conventional, high-speed printing techniques, so that A reduced air permeability is achieved in treated areas which promotes cigarette self-extinction and does not adversely affect the taste or quality of the cigarette.

OBJECTS AND BRIEF DESCRIPTION OF THE INVENTION It is a principal object of the present invention to provide a smoking or smoking article, particularly a cigarette, having improved proclivity or ignition propensity characteristics. Another object of the present invention is to provide a wrapping of the smoking article for use with smoking articles, particularly cigarettes, which promotes self-extinction of the smoking article if the article is dropped or left aside alone or unattended. in a flammable substrate. And yet another object of the present invention is to provide a method for producing a wrapping of the smoking article having improved propensity or propensity characteristics on a commercially convenient scale of production. And still a further object of the present invention is to provide a smoking article having improved proclivity or propensity to ignition characteristics without adversely affecting the taste of the smoking article. Another object of the present invention is to provide a "wrapping of the smoking article which improves the ignition proclivity of the smoking article without affecting the external or aesthetic appearance of the smoking article." Yet a further object of the present invention is to provide a smoking article wherein the mechanism for improving the proclivity or propensity for ignition does not adversely affect the release of smoke or flavor from the smoking article A further object of the present invention is to provide a wrap for smoking articles that significantly reduce the proclivity or ignition propensity of the smoking article without adversely affecting smoking characteristics.Additional objects and advantages of the invention will be described in part in the following description, or it may be obvious from the description, or it may be instructed through the practice of the invention. The objects and advantages of the invention can be realized and obtained through the means and combinations particularly indicated in the appended claims. j-cira x.cgrar -? C3 objects and -according D * "ODÓS i •" < "&dt;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; characteristics of proclivity or propensity to improved ignition.The article for smoking includes a tobacco column inside a wrap.

-L .-? V_x.'wi_ i3 '-xiici? _ X_ CJ-ILLCX < _t- -_ / a. j_r < _: x- - ¿i-- -to x - LU .11CX. r / s_: x.x. x, v_x.? _: external circulation. Discrete areas of the outer circumferential surface are treated with a non-aqueous solution of a soluble cellulose polymer, solvent, dissolved in a non-aqueous solvent. The solution also includes a non-reactive, inorganic, particulate filler, suspended in the solution. The discrete areas treated have a smooth texture and are not r - rs n + - n r - r rs r rs r rs n r rs s - ms -s Vs s 1 s r- -. < ~ 1 xcx Lx vaincu -C io vy -_, -_ / uit-- XCJI CJJ u uca ucaux ucauxxx within the o-predetermined which is CO? OCT that reduces the propensity for ignition if the cigarette is dropped or otherwise left aside without attending to a flammable substrate.The treated areas provide improved proclivity or propensity to ignition characteristics by reducing oxygen to a smoldering coal without flame of the cigarette afiuO 8 coal nera-, vanza sn _.as arsas ra_.av_j.as A pe dibility white or target of the areas tra_.av_i.as qus __cs_ applicants usp found to be o '^ OSSS QQ mc-nrtr rt (((((?? m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 m2 En En En En En En 的 a'. , the areas treated with the non-ac solution uosa includes a plurality of discrete bands that are placed circumferentially around the smoking article and are spaced apart longitudinally along the rs ^ Ts rs.sl ^ s T -s rs s - *, rs ^ * -, rs rs , s ^ s rsl rs rs 4- rs rs s vs isrs -s - - rs - 'rsis vs rss -. , t rs r ~ *, rs CL J_ '_. x_ v_ l J_ yj. ua and CJ.11 t_? cx or J UCUCU LCIICX Lina cm v_. i ta? _ a íua. and \ j ±. ? mm 03 to go to r * a rh? n my noral GTHQ to t ll call do not burn through the treated area before the smoking item is extinguished. The bands can be spaced apart at a distance of essentially between 5 and 10 mm. In the further embodiments of the invention, xa c? X-v_: c? _s xa a a or c ucxx cii cu x. CL cu v? Xuuxa t_.ii t_mc_ configuration so that a line of burning or circumferential combustion advancing in a combustion direction of the smoking articles is burned through a predetermined radius of treated areas and untreated areas in any position along the length of the article to smoke. In this way, at least some portion of untreated area is burned at ucx- u.i.lj.v_? V_r ucx ax? .x uxu na af usisr for nio ß sT the treated areas may have on the release of smoke or flavor. The treaty ratio to untreated areas may be relatively constant throughout the length of smoking or to smoke the article for smoking, or the ratio may vary along the length to smoke. In a particular embodiment of the treated treated areas, zigzag bands are placed around the smoking article. The bands are spaced apart from each other and aligned so that the circumferential burn line always finds at least some portion of at least one of the zigzag bands in at least some portion of an untreated area. Alternatively, the treated areas can be defined as irregular forms of interfixing on at least a portion of the smoking length of the smoking article. Similarly, the treated areas can be defined as regular forms of interfiling, such as circles, squares, or other forms of uniform repetition. The treated areas can also be defined as irregular shapes without interfixing on at least a portion of the smoking article. The irregular shapes are spaced apart so that the burned line or "circumferential combustion always encounters at least a portion of at least one of the areas? _ra_a -_? A3 S ome irregularly and at some time some. of a re? si ^^^^ r In -in preferred embodiment of the invention, the solvent soluble cellulosic polymer comprises ethyl cellulose in a concentration of about 15% to 35% by weight of solution. The nonaqueous solvent in this embodiment comprises a mixture of an alcohol and acetate, such as a mixture of 50/50 isopropyl alcohol and a-C'wQLU UC C-J- J- • ULXVrO ¡_ _ XitlC X- V_J V-, CX Ll V- / X V_. v_y _y O? nl -won -t-o; c-o, -nnt- omp l an \ r OQi-anionion Hol Holder \ r spirit of the invention. The solution also includes a relatively fine particulate filler suspended in solution.

The filler material is a non-reactive material. inorganic e__ c a, ^ o with csxUxOSico, f? ~? > -ma a nal í nlp n l l anvn l hira pna -ero? rtno ol non-curable solvent is removed by a drying process. Applicants have found that suitable fillers include chalk or chalk, clay, and titanium oxide. Other suitable fillers may also exist. uua v_.ci x ci v_. _. cxx L. x v_, v_ ucocauxc to t'axLXLuxa uciiLc cx c- * "Qar O s -? * -_- n / - i 'or Q r-rna the Q I PÍ n QO??? rs.p OH anl i, ", to the envelope in processes of commercial printing at a relatively high speed, such as printing techniques -_ ?? _?? - S? Ogra? Ia or gravare. The solution can be applied to the envelope sleeve in a. ^^ or rin.i-r > / -. multiple steps to achieve the desired reduction in permeability. The viscosity of the solution can therefore be adjusted depending on the number of passes. Additionally according to the objects of the invention, a wrapping of the smoking article is CL LCJixcji v, v-. d_- c ~ v_. _.c x x or i - LV_ V_XC V_- V_I LL x _ x v_? c xa. nrn? - 1 i iri rtaH r ~? Ho i / in i pi? N mo-? Í- i-aHa QT wrapper comprising a paper web having discrete areas of an outer circumferential surface is treated with a nonaqueous solution of a solvent soluble film forming material cellulose dissolved in a non-aqueous solvent. The solution also xuwxu and c UJI uia Cxxax xcxxc iau? L -_ / a x < - L? Uxauv • - QnonHi H on «ni rri? N T ac; r, a? ~ ar - t-or-í < The embodiments of this wrap include those described above with respect to the smoking article of the present invention The present invention also includes a method for producing a wrapping of the smoking article having control characteristics. of proclivity or ^ / x u cu x? u CL xa x.g u x > w xwu, jucjuiauao. I_J x mC .a? xmwXUj C ap "i -;!?. a nonaqueous solution of an aqueous polymer with a _ particulate filler material go organic suspended in solution for a part of the smoking article treated areas discrete The five treated areas are dried, for example through a hot air applied, so that essentially all of the non-aqueous solvent is removed leaving a film dei cellulosic material and filler material in the jsrCl C Cll X Cl iCQJ LO aua. l_l X ULC L 'w'V_lVw' XULlUj C a ^ xiLax or the non-aqueous solution so that the dry treated areas have a permeability of less than 6 ml / min / cm2, preferably within a range of 2 to 6 ml / min / cm2. the article for smoking is reduced when the smoking article burns in the treated areas if it is dropped or left aside alone or unattended on a substrate TT * 1 mot? I- ^ r i nri Noric aHi ri ne Q? LmgntO applying to the nonaqueous solution to the paper in discrete bands 0 in a transverse direction on the paper, and spaced bands spaced apart a distance of between 5 to 10 mm. The bands preferably have a width of at least 4 mm. U * 1 m? F rís rs l isTrrs -, - JrstvsA _- - 'J_J x IUCL.V_ -_IW x ?? v_.xu? C aucui o a.j-1. pair have a minimal effect on the smoke and flavor release of the smoking article. Configurations can have any manner of shapes regular repeating or irregular shapes and are designated so that a burn line or circumferential combustion article length advancing smoking always burning at least some portion of untreated area and the treated area. The method preferably includes printing the treated areas in a high speed, commercial printing process, such as a flexographic or gravure printing process. The areas can be applied in these printing processes in a single step or multiple steps. The appended drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a smoking article according to the invention; Figure 2 is a component view of the smoking article of Figure I particularly illustrating the treated areas of the wrapping of the article for sea; Figure 3a is a perspective view of a smoking article according to the invention having a unique configuration of treated areas defined on the wrapper; Figure 3b is a plan view of the casing used in Figure 3a; Figure 4a is an alternative partial perspective view of a smoking article according to the invention "having a zigzag configuration of treated areas - defined in the wrapper;" Figure 4b is a plan view of the wrap used in the invention; Figure 4a and Figure 5a to 5f are alternative views of configurations of treated areas that can be defined in the wrapping of the smoking article to minimize the effect of the porosity reducing solution on flavor and smoke release.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference is now made in detail to the presently preferred embodiments of the invention, one or more examples of which are included in the accompanying drawings. Each phase of the invention is discussed in the context of the invention, not as a limitation of the invention, it will be evident to those skilled in the art that several modifications of the invention will be evident. and variations can be made in the present invention without departing from the scope or spirit of the invention, For example, the features illustrated or described as xr? _e we a _? CUQXX Q can be used in o_.ra modality pror, orci? P.3r an additional modality. Thus, it is intended that the present invention cover such modifications and variations that are within the scope of the appended claims and their equivalents. For the purpose of explaining the invention, the methods and principles of the invention will be described with respect to a crank xxO. -_ »n cm __- 'ar o, o5 * -n OQ r-, a r-a -m-? ~ .tp or qi fn < - ovni and paci? n o l a? n-; > -onr-? r.n only and does not mean that it limits the invention only to 20 cigarettes. Any form of the article for smoking is within the scope and spirit of the invention. The invention relates to an article for smoking, and to wrapping for a smoking article, having characteristics of control of proclivity or inclination x _r or _ x sj -i x v_. x w- li, me j vrxaua. ua -_- x yj wxxvx aa-vi -w- _-- x v ___ / c i- x _ / u article '"' ar f mar or cigarette an? na ^ ín-o Hiar- :: * -. - bsr ra + - or flammable if the cigarette that is burned or smoked is dropped or otherwise left on a flammable substrate A test for the ignition proclivity of a cigarette has been established by NIST (National Institute of Standards and Technology (National Institute of Standards and Technology)) yww tiiisr xc? wc wxw * w cix uii wx -_ xx xx '1 Lt cx xx x xx xx xx - * n *? na tol a .Ho nr-poha i nfl loves l and y? ropi < , fRr the j-onHonci a of the cigarette to either burn the texture or test cloth, burn the test texture beyond a normal carbon line of the texture or fabric, burn its full length without igniting the fabric or texture , or 15 self-extinguish before igniting or igniting the test cloth or burning its full length. What do you think? L. x ci or FIGS. 1 2. A smoking article (cigarette), generally 10, having 20 improved ignition proclivity characteristics include a tobacco column 12 within a wrapper 14. Article 10 may include a filter 26. The wrapper 14 can include any commercially available form of cigarette wrap, such as _ ^ _ u ^. i? J of cape plot is cn ° dc? "^ ^ on i ^ rm < =. rí-? nori- ^ The paper web 14 defines an outer circumferential surface 16 when wrapped around the tobacco column 12. The discrete areas 18 of a non-aqueous solution. This solution includes a solvent soluble cellulosic polymer material or dissolved in a non-aqueous solvent. The solution also includes a particulate inorganic non-reactive filler worn or suspended in the solution, as described more fully below. It should also be understood that the treated areas will be wrapped around the wrapper. In other words, the wrapper 14 could be wrapped around the top of the wrapper. Tobacco column 12 so that the treated areas 18 are adjacent to the tobacco. In the embodiment illustrated in Figures 1 and 2, the treated areas 18 are defined as bands of x -wVwX ii xctii c cax -wxxvwv-tiixcxciivwxaxco __- .. X CIO auua 4 s ° conaran e tre longitudinally at the length of the cigarette 10. Bands 24, and 5 particularly fine particulate filler 22 are .i xww.li cu x __ w _ -. _ »__ w cu xa. r? sju-a x. __ n emDargo, G? it should be understood that the treated areas are essentially invisible in the cigarette formed as shown in Figure 1. In other words, a smoker can not distinguish from any external signal that the wrapper 14 has been treated in areas discrete 18. In this respect, the treated areas 18 have a smooth and flat or smooth texture essentially the same as areas without root. - n T a an / - huí-a • o? naf i aHn Ho 1 a «h a n H a = 3 & They are dependent on a number of variables, such as the initial permeability of the envelope 14, density of the "tobacco 12" column, etc. The bands 24 preferably have a width such that the oxygen is limited to the burned mineral carbon. for a sufficient length or period of time for which the combustion coal could be burned through the band. 24 ~) ^ before autoe.tinguish. The applicants have determined that, for the cigarettes tested, a minimum bandwidth of 4 mm is desired. __? X C O J-r-C-Lr X CIUV- / C 11 L. x c u tao x • - CL1 J_ XC11 CO UU xaw - of a number of variables. The spacing should not be greater than the size of the crankshaft if a length or time is expected - it causes a fire to ignite or ignite a substrate before using the mineral coal in a treated area. Spacing between the bands 24 also affects the thermal inertia of the coal 5 combustion mineral, or the ability of the mineral coal to ignite or ignite through the treated bands 24 without self-extinguishing. In other words, the spacing between the bands 24 should not be greater than cx- car__On out uCC? IUUS ICU burns C your fiercely "hot r hot enough * to burn through one of the bands 24 when they reach be in contact with the respective band. On the other hand, the spacing between bands 24 should not be less than the cigarette which tends to shut off or self-extinguish in a state of free combustion. In the cigarettes tested, applicants have or c; ? -j ~? rJ_s -í H. ". . "if pm..h __. a- -rp _,? w ,, wc¡ o_ r-lowh-ro-r-a- a. r: i- c tr m_-wí.ow ol band spacing can to be any suitable width or 0 as determined by any number of variables, although the transverse direction (DT) bands of permeability reducing areas have been shown to be particularly effective in reducing the ru? au xxt? u and propensity to xa Ignition u? cigaxxixxOo, co pu3ijw__e that Ó_83 uap ss may also have an undesirable discontinuous effect on the "iho - a _An '1C huiro and flavor for the smoker. For example, if the change in permeability between the treated areas and 5 untreated areas of the cigarette is relatively greater, the smoker can distinguish a difference in taste and release of smoke. Accordingly, the present invention also relates to designs or profiles cos u xas areas for minimizing cx? X c O 1 - . 1 - "Hole-to-Hook-Up" the 1st-day Smoker to the smoker Unique designs present for the treated areas provide more uniform smoke release over the full length of the cigarette.Examples of preferred designs for the areas of treatments are particularly shown in the Figures 3 to 5. In all the illustrated examples, the areas 4_ v-c-si4 ci .ur-Jc-siors 1 Qu o rsc rs u, -! c -sj F - s L rUsC rs rUs rs r LsL x v-crsxI c-if-sxs- Arus c -si axcsü r us? rs 4 Li v ~ a -s 4ua .ur-Ia-so.- 2 of Thus, a circumferential combustion line 32 (as seen in FIGS. 3b and 4b) advancing 20 in a combustion direction of the smoking article, for example toward the filter 26, burns through a ratio of treated areas. and untreated areas 28 to any position along the smoking length of article 10. For example, referring to -__.-__- to-L -w-ij-aj-ULunuc d gone - and kj / ± ao a_.ca treated 18 are defined as cross bands 24 which essentially form a diamond configuration 4 - '. Referring to the corroding lines 32, it can be seen that when the combustion line advances along the length of the cigarette, it will always burn through a ratio of treated areas 18 to the untreated areas 28. In this way, since at least some portion of untreated area is always burned, the smoker never puffs smoke over an area comprising only treated areas. Thus, the change in flavor or release of smoke that results from differences in permeability will be less discernible to the smoker. The smoker will find a more uniform smoke flavor and release over the entire length of the smoking article. An alternative embodiment of a configuration for treated areas 18 is shown in Figures 4a and 4b. In this embodiment, the treated areas 18 comprise bands 24 placed in a zigzag configuration 34. The zigzag lines are separated from each other and aligned so that the combustion line 32 always finds at least some portion of a zigzag band 24. and at least some portion of an untreated area 28, as seen in particular in Figure 4b.

The configuration for treated areas 18 can comprise any form of design which allows the combustion path 32 to burn at least some proportion of treated area 28 towards the untreated area 18. The ratio between treated areas and untreated areas 28 can remain constant over the entire length of the cigarette, for example, as in the embodiment of Figure 5a, or the proportion may vary along the length of the cigarette, as for example in the embodiments of Figures 5b, 5c, and 5d .

The unique configurations for treated areas 18 may comprise a configuration of regular interflanged shapes 38, such as frames 42 in Figure 5a and circles 40 in Figure 5b. The treated areas will interfere. because they connect or contact the entire configuration. Alternatively, the treated areas 18 can be defined in a configuration of irregular interflange shapes 36, as illustrated in Figure 5e. Alternatively, the treated areas can be defined as a configuration 46 of regular shapes without interworking, for example as shown in Figures 5c and 5d. And still with another embodiment, the treated areas 18 can be defined as a configuration 44 of irregular non-interfined shapes, __ -5 as illustrated in Figure 5f. It should be understood that any form of design or profile for treated areas is contemplated within the scope and spirit of the invention. The treated areas 18 have a permeability within a range which is known to provide improved ignition propensity or propensity characteristics for the manufacture of the cigarette 10. When the charcoal of the cigarette 10 is burned in treated areas., the oxygen available for the combustion coal is substantially reduced due to the decrease of permeability of the envelope 14 in the treated areas. The reduction of oxygen preferably causes the cigarette to self-extinguish or self-abate in the treated areas 18 when placed in contact with a substrate. Applicants have determined that a preferred permeability is less than 6 ml / min / cm 2 (CORTESA), and generally within a range of 2 to 6 ml / min / cm 2. Applicants have found that this range provides the desired self-extinguishing results when burning the mineral coal from the cigarette in the treated areas. The solution applied to wrap 14 in treated areas 18 provides reduced permeability in the treated areas. Applicants have found that a non-aqueous solution of a solvent soluble cellulosic polymer with a non-reactive particulate inorganic filler suspended in the solution works particularly well. The non-aqueous solvent tends not to interrupt the inter-fiber bonding (eg, hydrogen bonding) of the paper web and, thus, does not significantly decrease the strength of the paper web. Also, the non-aqueous solvent does not cause the paper web to wrinkle or shrink when the solvent dries. This allows the casing 14 to have a smooth or smooth and aesthetically pleasing appearance. Applicants have found that a particularly suitable non-aqueous solvent is a mixture of an alcohol and an acetate, for example a 50/50 mixture of isopropyl alcohol and ethyl acetate. However, it should be understood that this is but a preferred solvent, and any suitable solvent or non-aqueous solvent mixture can be used in connection therewith. For example a 60/40 mixture of normal propyl acetate and normal propyl alcohol has also been shown to work particularly well. Applicants have also found that a suitable solvent soluble cellulosic polymer is 21 ethyl cellulose Ethyl cellulose is generally in a concentration of about 15% to 35% by weight of solution, and preferably about 25% by weight of solution. However, any cellulose-based polymer can be used in this case, including hydroxypropyl cellulose. A non-reactive inorganic particulate filler 22 is added to the solution. The applicants have found that. the filler 22 significantly improves the ability of the treated areas 18 to self-extinguish or auto-off the combustion coal. The solution with the filler is more effective in reducing the permeability of the paper web in treated areas 18. Applicants believe that the inorganic filler 22 forms a layer on the envelope surface 14 with the ethyl cellulose which acts as a binder or " glue "for the filler particles. Applicants believe that the filler particles tend not to collide or strike with the pores of the casing 16 and form a relatively smooth surface coating. The filler and the cellulose polymer form a coherent and smooth surface coating which significantly reduces the permeability of the paper in the treated areas. It is also believed that the solution containing the inorganic filler particles is less affected by the heat of the combustion cigarette, thus ensuring that the coating remains intact so that it is effective in restricting oxygen to the burning coal. Any number of inorganic fillers may be suitable in the present invention. Any filler material can be used which can be spent homogeneously in the non-aqueous solution to form a surface film with the cellulosic polymer without affecting the texture or appearance of the wrapper. Applicants have found that particularly good fillers are chalk, clay, and titanium oxide. The present invention also pertains to a wrapping of the smoking article for use with smoking articles, as essentially described above, as well as a method for making the wrapping of the smoking article. The inventive method for producing the wrapper of the smoking article having improved ignition proclivity control characteristics includes applying a non-aqueous solution of a cellulose polymer that forms the film "and non-aqueous solvent with a particulate filler material. Inorganic suspended in the solution for a paper of the smoking article in discrete treated areas, such as bands 24 as described above The treated areas are then dried so that essentially all the non-aqueous solvent is removed leaving a film of the cellulosic material and filler material on paper in treated areas 18. The method includes applying the non-aqueous solution so that the dried treated areas 18 have a permeability within the known range to cause the self-extension or self-extinguishing of the cigarettes, for example, inside. from a range of 2 to 6 me / min / cm2 The method also includes printing the solution in the tram to paper in discrete areas by means of conventional high-speed printing operations. Applicants have found that suitable printing techniques include printing by gravure and flexographic printing. The treated areas can be applied in printing operations in either single step or multiple steps. Accordingly, the viscosity of the solution is controlled to be adequate with high speed printing techniques. Applicants have also found that the desired white permeability ranges are easily achieved by applying the solution to areas treated in multiple passages with conventional printing machines. However, it is also possible to achieve the desired permeability range by applying the solution in a single step and controlling the viscosity and amount of solution applied. The following examples relate to cigarettes produced according to the invention and are provided to more fully explain the invention. In each of the examples, the coating is applied in a three step process without intermediate drying. The base paper was grade 603 Kimberly-Clark paper with an average untreated permeability of 32.6 ml / min / cm2. The viscosity measured for the solution was 45 seconds using a Zahn Cup # 2 Viscometer.

EXAMPLE 1 In a first series, the ALPHATEX clay (China Anhydrous Clay) by Anglo-A erican Clay Corporation, was added to a base solution of ethyl cellulose (approximately 25% by weight of solution) was dissolved in a 60/40 mixture of normal propyl acetate and normal propyl alcohol. A 10 mm band of solution was printed in a three step process on a KC Grade 603 Kimberly-Clark paper, base, with an initial average porosity of 32.6 ml / min / cm2. The clay was added to 3% by weight of solution with a coating weight of the treated areas of 3.0 g / m2. The average permeability of this set of cigarettes was 3.1 ml / min / cm2. Three of three tested cigarettes were self-extinguished or self-extinguished in or near the coated area.

EXAMPLE 2 In a second series, the ALPHATEX clay (China Anhydrous Clay) by Anglo-American Clay Corporation was added to an ethyl cellulose base solution (approximately 25% by weight of solution), dissolved in a 60/40 acetate mixture of normal propyl and normal propyl alcohol. A 10 mm band of solution was printed in a three step process on a KC Grade 603 base paper from Kimberly-Clark with an initial average porosity of 32.6 ml / min / cm2. -The clay was added to 6% by weight of the solution. The average permeability of this set was 1.6 ml / min / cm2. Four out of four tested cigarettes were self-extinguished or autoapaged at or near the coated area.

EXAMPLE 3 In a third series, Ti02 was added to a solution of etii cellulose base (approximately 25% by weight of solution) was dissolved in a mixture of 60/40 of normal prcpilo acetate and normal propyl alcohol. Ti02 was added in the form of a white ink. The ink was approximately 10% Ti02 with a nitrocellulose binder. A 10 mm band of solution was printed in a 3 step process on a KC Grade 603 base paper from Kimberly-Clark with an initial average porosity of 32.6 ml / min / cm2. The Ti02 was added to 0.5% by weight of the solution with a coating weight of the treated areas which was 3.4 g / m2. The average permeability of this set was 3.2 ml / min / cm2. Four of four tested cigarettes self-extinguished to self-extinguish at or near the coated area.

EXAMPLE 4 In a fourth series, Ti02 was added to a solution of ethyl cellulose base (approximately 25% by weight of solution) was dissolved in a mixture of 60/40 of normal propyl acetate and normal propyl alcohol.

The Ti02 is added, in the form of a white ink. The ink was approximately 10% Ti02 with a nitrocellulose binder. A 10 mm band of solution was printed in a 3 step process on a KC Grade 603 base paper from Kimberly-Clark with an initial average porosity of 32.6 ml / min / cm2. The Ti02 is added to -1.0% by weight of solution with a coating weight of the treated areas which is 4.2 g / m2. The average permeability of this set was 1.8 ml / min / cm2. Four of four tested cigarettes self-extinguished or "self-extinguished in or near the coated area." EXAMPLE 5 In a fifth series, Ti0 was added to a solution of ethyl cellulose base (approximately 25% by weight of solution) was dissolved in a mixture of 60/40 of normal propyl acetate and normal propyl alcohol. Ti02 was added in the form of a white ink. The ink was of about 10% Ti02 with a nitrocellulose binder. A 10 mm band of solution was printed in a 3 step process on a KC Grade 603 base paper from Kimberly-Clark with an initial average porosity of 32.6"ml / min / cm.sup.2 TiO2 was added at 1.2% by weight - of solution with a coating weight of the treated areas that is 4.7 g / m2 The average permeability of this set was 0.91 ml / min / cm2 Four of four tested cigarettes self-extinguished or self-extinguished in or near the coated area .

EXAMPLE 6 In a sixth series, Ti02 was added to a base solution of ethyl cellulose (approximately 25% by weight of solution) and dissolved in a mixture of 60/40 of normal propyl acetate and normal propyl alcohol. Ti02 was added in the form of a white ink. The ink was approximately 10% Ti02 with a nitrocellulose binder. A 10 mm band of solution was printed in a 3 step process on a KC Grade 603 base paper from Kimberly-Clark with an initial average porosity of 32.6 ml / min / cm2. Ti02 was added to 2.5% by weight of solution with a coating weight of the treated areas which is 4.9 g / m2. The average permeability of this set was 0.74 ml / min / cm2. Since the permeability of this set was less than 0.91 of Example 5, it was not necessary to test the ignition proclivity. It was fully expected that any cigarettes treated with the composition could self-extinguish.

EXAMPLE 7 In a seventh series, Ti02 was added to a solution of ethyl cellulose base (approximately 25% by weight of solution) was dissolved in a mixture of 60/40 of normal propyl acetate and normal propyl alcohol. Ti02 was added in the form of a white ink. The ink was about 10% Ti02 with a nitrocellulose binder. A 10 mm band of solution was printed in a 3 step process on a KC Grade 603 base paper from Kimberly-Clark with an initial average porosity of 32.6 ml / min / cm2. Ti02 was added to 5.0% by weight of solution with a coating weight of the treated areas which is 9.7 g / m2. The average permeability of this set was 0.29 ml / min / cm2. Since the permeability of this set was less than 0.91 of Example 5, it was not necessary to test the ignition proclivity. It was fully expected that any cigarettes treated with the composition could self-extinguish.

EXAMPLE 8 In another series, MULTIFLEX chalk (precipitated calcium carbonate) from Specialty Minerals, Inc. was added to a solution of ethyl cellulose base (approximately 25% by weight solution) in a 50/50 solvent of normal propyl acetate and normal propyl alcohol. The chalk was added to 9% by weight of solution. 5 mm transverse direction webs were printed on a KC Grade 603 base paper from Kimberly-Clark with an average initial porosity of 32.6 ml / min / cm2 in a three-step gravure printing operation. The average permeability for the treated areas was less than 2 ml / min / cm2. In proclivity or ignition propensity tests conducted on a # 4 cotton canvas material with a film underneath, 3 of 5 cigarettes self-extinguished or self-extinguished and 1 cigarette burned its full length without igniting the substrate. In the test conducted on a # 6 non-film cotton canvas material, 1 of 6 cigarettes was self-extinguished. "In this test, it seems that the bandwidth of 5 mm was not enough to extinguish the cigarette and the spacing of the 10 mm band was too large to prevent a fire or ignition.

EXAMPLE 9 In this series, a diamond or square cross gate configuration was printed on a Grade 603 paper by Kimberly-Clark. The configuration consists of bands of 2 mm width spaced 4 mm away and arranged at an angle of 45 degrees. The configuration is printed on a commercial engraving press in a 3-step process. The solution used was ethyl cellulose (approximately 25% by weight of solution) in a 50/50 solvent of normal propyl acetate and normal propyl alcohol with Multiflex chalk added to 9% by weight of solution. With the Multiflex chalk filler, the viscosity of the solution was 39 seconds in the glass. In proclivity or ignition propensity tests conducted on a # 4 cotton canvas material with a film underneath, 5 out of 6 S-cigarettes were self-extinguished. In tests conducted on a # 6 non-film cotton canvas material, 4 of 6 cigarettes were self-extinguished. It will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope and spirit of the invention. For example, the features illustrated or described as part of one embodiment may be combined with another embodiment to produce a still further embodiment. Thus, it is intended that the present invention cover the modifications and variations of this invention provided, they come within the scope of the appended claims and their equivalents.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is that which is clear from "the present description of the invention." Having described the invention as above, property is claimed as contained in the following

Claims (42)

1. A smoking article having improved proclivity or propensity to ignition characteristics, the article is characterized in that it comprises a tobacco column inside the envelope, the envelope comprises a paper web with untreated areas and discrete areas thereof treated with a non-aqueous solution of a soluble solvent cellulose polymer dissolved in a non-aqueous solvent and a non-reactive particulate inorganic filler suspended in the solution to form a film on the wrapper in the treated discrete areas, the treated discrete areas having a smooth texture and relatively soft or flat and comprising a permeability within a predetermined range sufficient to reduce the ignition proclivity, the treated areas that reduce the proclivity to ignition by reducing oxygen for a burning coal without flame from the cigarette when the mineral coal burns and it advances in the treated areas.

2. The article according to claim 1, characterized in that the treated areas comprise a permeability of less than 6 ml / min / cm23.

The article according to claim 1, characterized in that the treated areas comprise a plurality of discrete circumferential bands arranged longitudinally along the smoking article.

4. The article according to claim 3, characterized in that the bands have a width greater than 4 mm.

5. The article according to claim 3, characterized in that the bands are spaced apart at a distance essentially between 5 and 10 mm.

6. The article according to claim 1, characterized in that the solvent soluble cellulosic polymer comprises ethyl cellulose.

7. The article according to claim 1, characterized in that the non-aqueous solvent comprises a mixture of an alcohol and an acetate.

8. The article according to claim 1, characterized in that the filler comprises any combination of chalk, clay, or titanium oxide.

9. The article according to claim 1, characterized in that the solvent soluble cellulosic polymer comprises ethyl cellulose and the non-aqueous solvent comprises a mixture of isopropyl alcohol and ethyl acetate, and the filler comprises one of chalk, clay, or titanium oxide.

10. The article according to claim 1, characterized in that the solvent soluble cellulosic polymer comprises hydroxypropyl cellulose.

11. The article according to claim 1, characterized in that the treated areas are applied to the paper web in a direct-pass printing technique.

12. The article according to claim 11, characterized in that the treated areas are applied to the paper web by means of one of the techniques of flexographic printing, direct engraving, or offset printing.

13. The article according to claim 1, characterized in that the treated areas are defined in the envelope in a configuration so that a circumferential combustion line advancing in a combustion direction of the smoking article burns through a predetermined proportion of the treated areas and untreated areas at any position along a length of the smoking article, wherein at least some portion of the untreated areas is burned along the full length of smoking or smoking of the article to smoke.

14. The article according to claim 13, characterized in that the proportion of areas treated to untreated is relatively constant along the smoking length of the smoking article.

15. The article according to claim 13, characterized in that the proportion of treated-untreated areas varies along the smoking length of the smoking or smoking article.

16. The article according to claim 13, characterized in that the treated areas are defined as irregular forms of interfixing on at least a portion of the smoking length of the smoking article.

17. The article according to claim 13, characterized in that the treated areas are defined as regular forms of interfixing on at least a portion of the smoking length of the smoking article.

18. The article according to claim 17, characterized in that the regular shapes are one of circles, squares, or another form of uniform repetition.

19. The article for smoking according to claim 13, characterized in that the treated areas are defined as irregular shapes without interfixing on at least a portion of the smoking article, the irregular shapes are spaced apart so that the circumferential burn line always finds at least some portion of at least one irregularly treated area and at least some portion of the untreated areas.

20. The smoking article according to claim 13, characterized in that the treated areas are defined as crossed bands disposed along the smoking article.

21. A wrapping of the smoking article having improved proclivity or propensity to ignition characteristics, the wrapping is characterized in that it comprises a paper web with untreated areas and discrete areas thereof treated with a non-aqueous solution of a material of cellulose forming the soluble solvent film, dissolved in a non-aqueous solvent with a non-reactive particulate filler material suspended in the solution, the treated discrete areas having a flat or smooth and relatively smooth texture and comprising a permeability of less than 6 ml / min / cm2.

22. The casing according to claim 21, characterized in that the treated areas comprise a plurality of discrete bands arranged in a cross direction in the envelope.

23. The wrapping according to claim 22, characterized in that the strips have a width greater than 4 mm.

24. The casing according to claim 22, characterized in that the bands are separated from each other at a distance within a range of essentially 5-10 mm.

25. The wrapper according to claim 21, characterized in that the cellulosic material "forming the film comprises ethyl cellulose.

26. The casing according to claim 21, characterized in that the non-aqueous solvent comprises a mixture of an alcohol and an acetate.

27. The casing according to claim 21, characterized in that the filler material comprises one of chalk, clay, or titanium oxide.

28. The casing according to claim 21, characterized in that the cellulose material forming the film comprises hydroxy propyl cellulose.

29. The casing according to claim 21, characterized in that the treated areas are defined on the casing in a configuration so that a circumferential combustion line advancing in a combustion or burning direction of the smoking article is burned through a or predetermined proportion of the treated areas and untreated areas at any position along a smoking or smoking length of the smoking article, wherein at least some portion of the untreated areas is burned along the entire length smoking of the smoking article.

30. The wrapper according to claim 29, characterized in that the ratio of areas treated to untreated is relatively constant along the smoking or smoking length of the smoking article.

31. The wrapping according to claim 29, characterized in that the proportion of treated to untreated areas varies along the smoking or smoking length of the smoking article.

32. The wrapping according to claim 29, characterized in that the treated areas are defined as irregular forms of interfixing on at least a portion of the smoking or smoking length of the smoking article.

33. The casing according to claim 29, characterized in that the treated areas are defined as regular forms of interfixing on at least a portion of the smoking length of the smoking article.

34. The wrapping according to claim 29, characterized in that the treated areas are defined as irregular shapes without interfixing on at least a portion of the smoking article, the irregular shapes are separated from each other so that the circumferential combustion line is always at minus any portion of at least one irregularly treated area and at least some portion of the untreated areas.

35. A method for producing a wrapping of the smoking article having improved proclivity or propensity of ignition control characteristics, the method is characterized in that it comprises applying a non-aqueous solution of a cellulose polymer that forms the film and non-aqueous solvent with an inorganic particulate filler material suspended in solution to discrete areas of a paper of the smoking article, and drying the treated areas so that essentially all the non-aqueous solvent is removed leaving a film of the cellulosic material and filler material on the paper in the areas discrete treated, the method further comprises applying the non-aqueous solution so that the dried discrete treated areas have a permeability of less than 6 ml / min / cm 2, wherein the oxygen for the smoking article is reduced when the smoking article is burn in the treated areas.

36. The method according to claim 35, characterized in that the application of a non-aqueous solution of cellulose polymer and non-aqueous solvent forming the film comprises applying a solution of ethyl cellulose dissolved in a mixture of an alcohol and an acetate.

37. The method according to claim 35, characterized in that it further comprises diluting the solution with non-aqueous solvent to obtain a "suitable cup viscosity to apply the solution in one of a printing process by gravure or flexphy.

38. The method according to claim 35, characterized in that applying the non-aqueous solution to the paper in discrete areas comprises applying the solution in discrete bands in a transverse direction on the paper.

39. The method according to claim 35, characterized in that applying the non-aqueous solution to the paper in discrete areas comprises applying the solution in a configuration such that a circumferential combustion line that advances in a direction of combustion or burning of the smoking article. it burns through a predetermined proportion of treated areas and untreated areas at any position along a smoking length of the smoking article, wherein at least some portion of the untreated area is burned along the length to Complete smoking of the article for smoking.

40. The method according to claim 35, characterized in that it comprises applying the areas, treated in a flexphic printing process or by: engraving.

41. The method according to claim 40, characterized in that it comprises applying the treated areas in multiple steps in the printing process.

42. The method according to claim 40, characterized in that it comprises applying the bands in a flexphic or gravure printing process, in one step, and further comprising adjusting the viscosity of the non-aqueous solution and the amount of solution applied in the process of a step so that the discrete dry treated areas have a porosity generally within less, of 6 ml / min / cm2 and a smooth and relatively smooth texture.