MX2008012480A

MX2008012480A - Slit banded paper.

Info

Publication number: MX2008012480A
Application number: MX2008012480A
Authority: MX
Inventors: Rajesh K Garg; Tony A Phan
Original assignee: Philip Morris Prod
Priority date: 2006-03-31
Filing date: 2007-04-02
Publication date: 2008-11-27
Also published as: EA012774B1; CN101410027A; WO2007113693A2; IL194178A0; JP5676098B2; AU2007232212C1; NZ571301A; KR101564780B1; EP2457453A1; BRPI0709216A2; PT2007232E; ZA200807985B; JP2009531056A; AU2007232212B2; PL2007232T3; CA2647961C; EP2007232B1; UA92520C2; EA200870397A1; IL194178A

Abstract

Wrappers of smoking articles having slit banded regions 10 exhibit both low ignition propensity and reduced rates of self-extinguishment under free burn conditions. In one embodiment, the slit banded regions comprises first 11, second 12 and third 13 zones, with the second zone having greater permeability that the first and third zones, which comprise add-on material. A method of making the wrapperas is also disclosed, as are smoking articles including the wrappers.

Description

PAPER FRANJ EADO RAN U RADO BRIEF DESCRIPTION OF THE INVENTION In a first embodiment, a wrapping of a smoking article is provided comprising a base web and at least one transverse fringed region comprising first, second and third zones. The first and third zones comprise addition material, which reduces the permeability of the envelope. The first and third zones each have a width such that if either the first or third zone are applied separately to wrapping of smoking articles, smoking articles would exhibit statistically significant occurrences of total burn through and statistically few or no occurrences of self-extinction under conditions of free burning. The sum of the widths of the first and third zones is such that if the zones were applied to wrappers of smoking articles as a single continuous band (without a slot another discontinuity), the smoking articles would exhibit statistically few or no occurrence of burn total 3 tavés and statistically significant occurrences of self-extinction under free-burning conditions. The first and third zones are separated by the second zone. The envelope has greater permeability along the second zone than along the first third zones. The second zone has a width less than or equal to either the width of the perimeter and third zones, so that smoking articles ignited comprising the first, second and third zones exhibit statistically reduced occurrences of self-extinction under free-burning conditions. , as compared to smoking articles comprising wraps, over which the first and third zones are applied as a single continuous band, while statistically maintaining little or no occurrence of total burn through. In a second embodiment, a wrapping of a smoking article comprising a base web and a transverse fringed region of addition material is provided. The transverse fringed region is sufficient to cause extinction of smoking articles comprising the transverse fringed region when left on a substrate. The casing further comprises at least one intermediate zone, permeable to air, along the transverse fringed region, so that occurrences of self-extinguishing of smoking articles comprising the casing are statistically reduced over those without the intermediate zone. In a third embodiment, there is provided a wrapping of a smoking article comprising a base web and at least one transverse fringed region comprising first, second and third zones in the base web. The at least one transverse fringed region is free of fillers. The first and third zones are out of the second zone and the second zone has a greater permeability compared to the first and third zones. In a fourth embodiment, a wrapping of a smoking article is provided comprising a base web and at least one transverse fringed region comprising first, second and third zones in the base web. The first and third zones are out of the second zone, the second zone has a higher permeability compared to the first and third zones and the second zone and the first and third zones comprise addition material. In a third embodiment, a method is provided for making a framed wrapper of a smoking article comprising supplying a base web and forming at least one transverse fringed region comprising first, second and third zones in the base web. The first and third zones are out of the second zone, the second zone has a higher permeability compared to the first and third zones, and at least the first and third zones are formed from a filler-free addition material and optionally at least one of the zones is formed at least in part from addition material, which includes a filling. In a sixth embodiment, there is provided a method for making a fringed wrapper of a smoking article comprising supplying a base web and forming at least one transverse fringed region comprising first, second and third zones in the base web. The first and third zones are out of the second zone, the second zone has a greater permeability compared to the first and third zones and the second zone and the first and third zones are formed from an addition material.

BRIEF DESCRIPTION OF THE DRAWINGS FIGs. 1-3 are illustrations of smoking articles comprising grooved fringed paper as described herein. FIGS 4-5 illustrate alternate embodiments of smoking articles comprising grooved frangible paper as described herein. FIG. 6 is a schematic view of a multi-stage printing apparatus.

DETAILED DESCRIPTION Preferably, a smoking article is extinguished when placed on a substrate, and the tendency to do so is referred to herein as a smoking article having "low ignition propensity". Ideally, a low-propensity smoking article will continue to burn when left suspended freely, such as within the holder of an ashtray or when held in the hand without a puff ("burned free"). Many earlier cigarette designs that achieve low ignition propensity requirements exhibit high self-extinguishing velcroities under free burning conditions. The phrase "total burned through" as used herein, refers to testing by the E2187-04 standard of the American Society of Testing and Materials (ASTM), "Standard Test Method for Measuring the Ignition Strength of Cigarettes (Method). standard test to measure the ignition strength of cigarettes), which provides a measure of the capacity of a cycled paper fringed on, positioned on a combustible substrate, to continue to burn without puffing, thus, "total burned through" refers to the situation in which the coal proceeds completely through a region fringed in a cigarette wrap and does not cause extinction of the lit cigarette.In addition, the phrases "self-extinction under conditions of free burning" or "self-extinction" under free-burning conditions "as used herein, refer to extinguishing a lit cigarette without puffing, when such a cigarette is under conditions of which Free regions The fringed regions described herein exhibit both low ignition propensity and reduced self-extinguishing rates under free burning conditions. The fringed regions are preferably formed by printing, specifically intaglio printing, as described in detail below. As an alternative to printing, the fringed regions may comprise a highly refined fibrous cellulose pulp (for example, fibers, fibrils, microfibrils or combinations thereof) or other applied addition material using various spraying or coating techniques, including application using an orifice applicator in motion in the forming section of a papermaking machine as described in commonly owned US 5997691 and US 6596125, the contents of which are hereby incorporated by reference in their entirety. In another embodiment, the fringed region may comprise first, second and third zones of addition material, which may be applied by any of the methods described herein, wherein the second zone includes perforations, which are preferably filled with an occlusive material, which melts or is evaporated when the ignited coal approaches the fringed region to thereby provide the second zone with increased permeability.

In this manner, a wrapping of a smoking article comprising a base web and at least one transverse fringed region comprising first, second and third zones is provided. The first and third zones comprise addition material, which reduces the permeability of the envelope. The first and third zones each have a width such that if any of said first or third zones were applied separately to wrappers for smoking articles, the smoking articles would exhibit statistically significant occurrences of total burn through and statistically few or no occurrence of self-extinction under free-burning conditions (for example, after tasting a batch of 20 to 50 cigarettes). The sum of the widths of the first third zones is such that if the zones were applied to wrappers of smoking articles as a single continuous band (without a slot or other discontinuity), smoking articles would exhibit statistically few or no occurrences of self-smoking. -extinction under conditions of free burning. The first and third zones are separated by the second zone. The second zone comprises less addition material than the first and third zones or no addition material. The envelope has greater permeability along the second zone than along the first and third zones. The second zone has a width less than any width of the first and third zones (which may have equal or unequal widths), so that smoking articles ignited comprising the first, second and third zones exhibit statistically reduced occurrences of self-extinction under free-burning conditions, as compared to smoking articles comprising casings on which the first and third zones are applied as a single continuous band, while statistically maintaining little or no occurrence of total burn through. Preferably, the first third zones are of uniform addition material through the first and third zones. Optionally, the second zone may have a width essentially equal to the first and third zones. The total weight of addition material for the fringed region preferably falls in the range of 0.5 grams per square meter (g / m2) to 15 g / m2, more preferably in the range from 0.5 g / m2 to 3 g / m2, even more preferably in the range from 0.5 g / m2 to 1.5 g / m2, approximately. Conventional cigarette paper is permeable, with the permeability commonly designated in CORESTA, which measures the permeability of paper in terms of volumetric flow rate (cm3 / s) per unit area (cm2) per unit of pressure drop (cm. Water). The permeability of cigarette paper normally exceeds CORESTA and preferably the cigarette paper has a permeability of about 33 to about CORESTA and a basis weight of about 22 g / m2 30 g / m2. However, the permeability through the fringed regions and the underlying cigarette paper preferably falls in the range of 0 to 1 5 CORESTA. The reduction in permeability preferably restricts the flow of air necessary to support the combustion of the cigarette coal in the vicinity of the fringed region. The first and third zones of preference have a higher basis weight in grams per square meter than the second intermediate zone; for example, the basis weight in grams per square meter of the first and third zones can be at least twice the base weight in grams per square meter of the second zone. The second zone may comprise an opening. As used herein, the term "aperture" refers to a discrete area of a fringed region, between the first and third zones, that lacks permeability-reducing addition material (i.e., that does not contain layers of matrix material). permeability reducing addition). In order to assist combustion in the zone, the envelope may comprise iron oxide at the location of the second zone. The second zone preferably has a higher permeability than the first and third zones. The at least one cross-sectional region preferably comprises a first printed layer contacting the base web and a second printed layer, preferably having a basis weight equal to or greater in grams per square meter than the first printed layer, in the first printed layer . However, the second and / or subsequent layers may be better in basis weight than the first layer. For example, the basis weight in grams per square meter of the second printed layer can be at least twice the base weight in grams per square meter of the first printed layer. In one embodiment, the second zone may comprise a single printed layer and the first and third zones may each comprise at least two printed layers (more preferably three or more layers). Alternatively, the first and third zones may each comprise at least three or four printed layers, and the second zone may comprise only one or two or no printed layers. The non-fringed areas of the base web preferably do not comprise permeability reducing addition material. As described below with reference to FIG. 2, the transverse fringed region may comprise more than three zones. For example, the transverse fringed region may comprise, for example, five zones, with the second and fourth zones separating the first, third and fifth zones and the envelope having greater permeability along the second and fourth zones than throughout. of the first, third and fifth zones. A wrapping of a smoking article comprising a base web and a cross-sectional region of addition material is also provided. The transverse fringed region is designed to cause extinction of smoking articles comprising the transverse fringed region when left on a substrate. The casing further comprises an intermediate zone, more permeable along the transverse fringed region, so that the occurrences of self-extinctions of smoking articles comprising the casing are statistically reduced on those without the intermediate zone. In a further embodiment, a wrapping of a smoking article comprises a base frame and at least one cross-hatched region comprising first, second and third zones of the base frame. The at least one transverse fringed region may be free of relens and optionally at least one of the zones is formed at least in part from an addition material, which includes a filler. The addition material is preferably uniform throughout the first and third zones. The first and third zones are out of the second zone, and the overall envelope structure in the second zone has a greater permeability compared to the overall envelope structure in the first and third zones. Additionally, a wrapping of a smoking article comprising a base web and at least one transverse fringed region comprising the first, second and third zones in the base web is provided. The first and third zones are out of the second zone, the second zone has a higher permeability compared to the first and third zones, and the second zone and the first and third zones comprise addition material. The casings of the invention are preferably provided in coils and it is preferred that the casing in the coil comprises uniformly spaced transverse fringed regions or a repeating series of transverse fringed regions. Even more, a method is provided for making a fringed wrapper of a smoking article comprising supplying a base web and forming at least one transverse fringed region comprising first, second and third zones in the base web. The first and third zones are out of the second zone, the second zone has a higher permeability compared to the first and third zones, and at least the first and third zones are formed from a filler-free addition material. Optionally, at least one of the zones is formed at least in part from an addition material, which includes a filler. The addition material is preferably uniform throughout the first and third zones. Additionally, there is provided a method for making a fringed wrapper of a smoking article comprising providing a base web and forming at least one transverse fringed region comprising first, second and third zones in the base web. The first and third zones are out of the second zone, the second zone has a greater permeability compared to the first and third zones, and the second zone and the first and third zones are formed from an addition material. Optionally, at least one of the zone is formed at least in part from an addition material, which includes a filler. The addition material is preferably uniform throughout the first and third zones. FIGs. 1-3 illustrate smoking articles comprising grooved fringed paper as described herein. Specifically, FIG. 1 illustrates an article for smoking having two fringed regions 10, each comprising first and third zones of addition material 1 1, 1 3 separated by a second zone 12, which may be in the frm of an opening or may be in the shape of a zone of reduced addition material. The first and third zones of addition material 1 1, 1 3 may each be, for example, about 2 mm to 5 mm, preferably about 2 mm to 3 mm, wide and the second zone 12 may be, for example approximately 1 mm to 2 mm wide. More specifically, the first and third zones of addition material, 11, 13, may each be, for example, about 3 mm wide, and the second zone 12 may be, for example, about 1.5 mm or 2. mm wide. The first and third zones of addition material 1 1, 1 3 preferably comprise multiple layers of addition material, such as, for example, two, three or four layers of addition material. The addition material is preferably uniform throughout the first and third zones 11, 13. FIG. 2 illustrates an article to sign that has two fringed regions 20, each comprising first, third and fifth areas of addition material 21, 23, 25 separated by second and fourth zones 22, 24, which may be in the form of openings or in the form of reduced levels of addition material. The first, third and fifth zones of addition material 21, 23, 25 can each be, for example, about 2 mm to 3 mm wide, and the second and fourth zones 22, 24 can each be, for example, approximately 1 mm to 2 mm wide. More preferably, the first, third and fifth areas of addition material 21, 23, 25 can each be, for example approximately 2 mm wide and the second and fourth zones 22, 24 can each be, for example, approximately 1 mm wide or less. The first, third and fifth areas of addition material 21, 23, 25 preferably comprise multiple layers of addition material, such as, for example, two, three or four layers of addition material. The addition material is preferably uniform throughout the first, third and fifth zones 21, 23, 25. FIG. 3 illustrates a smoking article having two fringed regions 30, each comprising first and third areas of addition material 31, 33 separated by a second zone of less addition material 32. The first and third zones of addition material 31, 33 may each be, for example, approximately 2 mm to 3 mm in width and the second zone of less material of Addition 32 can be, for example, approximately 1 mm to 2 mm wide. More preferably, the first and third zones of addition material 31, 33 may each be, for example, about 3 mm wide and the second zone of less addition material 32 may be, for example, about 2 mm wide or less. The first and third addition material zones 31, 33 preferably comprise multiple layers of addition material, such as, for example, two, three or four layers of addition material, while the second zone of less addition material is provided. it may comprise, for example, one or two layers of addition material. The addition material is preferably uniform throughout the first and third zones 31, 33. Although the second zones 32 are operative at 1 mm in width, the mode performs better at 1.2 mm in width or greater. With reference to FIGs. 1-3, franked franked paper facilitates the use of lower permeability casings for a given level of CO than previous designs of franginated paper. For example, it was found in some cases that a tobacco bar comprising paper having a permeability of 33 CORESTA and a CO delivery (FTC) of 1 1 mg would produce 1 5 mg of CO (FTC), if previous versions of bands were applied. without additional charge. In order to counteract this increase, the permeability of the envelope would have to be raised to approximately 46 CORESTA. Such changes create a multitude of consequence in cigarette design, such as, for example, impacting puffs account, possibly decreasing the labrability of the paper and the like. In contrast, the grooved fringed paper having a permeability of 33 COREST gave 12 mg of CO (FTC). Thus, the grooved fringed paper technology described herein facilitates the application of bands with less impact on CO (FTC) levels.

Referring wings FIGs. 4 and 5, additional embodiments may include fringed regions, wherein the zones extend longitudinally rather than circumferentially. More specifically, FIG. 4 corresponds to the fringed region configuration of FIG. 2 with the areas extended longitudinally instead of circumferentially. FIG. 5 corresponds to the fringed region configuration of FIG. 3 with the zones extending longitudinally instead of circumferentially. In a preferred embodiment, the first layer of each fringed region is preferably formed using an aqueous aqueous composition, which extends completely through the fringed region. The successive layer (or layers) of each fringed region can be formed by using the same aqueous film-forming composition or different aqueous compositions. For example, multiple layers may comprise all layers containing starch exclusively or multiple layers may comprise one or more layers containing exclusively starch and one or more layers containing calcium carbonate (in any order). During intaglio printing, the occlusive composition is preferably heated to a temperature where its viscosity falls within the range of viscosities suitable for intaglio printing. When the heated occlusive composition is applied, the occlusive composition is cooled or extinguished and can be gelatinized. In this manner, a portion of the free water in the occlusive composition becomes bonded and unavailable to soak or migrate to underlying fibers of the base web. This binding of free water inhibits the formation of wavy, folded and / or wrinkled appearance in the base web. Successive layers of the fringed regions preferably have increased thickness relative to the first layer. The fringed regions provide a reduction in permeability to the underlying base web, which preferably restricts the air flow necessary to support the combustion of the cigarette carbon in the vicinity of the fringed region. Additional details of multiple progressive step printing can be found in the provisional commonly owned non-US application. 60 / 707,964 entitled PROGRESSIVE MULTI-PASS PRINT BANDED PAPER, presented on August 15, 2005, the contents of which are incorporated herein by reference in their entirety. The occlusive composition used in the occlusive composition can be selected from the group consisting of starch, alginate, carrageenan, guar gum, pectin and mixtures thereof. Preferably, the occlusive composition comprises starch, more preferably oxidized starch, such as, for example, tapioca starch, more specifically oxidized tapioca starch. In embodiments, the occlusive composition preferably does not contain fillers, such as, for example, calcium carbonate, which would increase the rate of burning through the fringed region. In a preferred embodiment, the occlusive composition used for printing comprises water and about 20% to about 50% by weight of the occlusive composition. At higher concentrations of the occlusive composition in the composition, the composition may undergo gelatinization when its temperature is rapidly reduced. In this way, the binding of free water in the printed fringed region can occur. At room temperature (about 23 ° C), the high solids occlusive composition has a viscosity that exceeds about 2 mPa-s (200 centipoise (cP)) and is not suitable for intaglio printing; however, at a temperature in the range of about 40 ° C to about 90 ° C, the viscosity of the occlusive composition is decreased enough to be used as a printing composition by intaglio. For intaglio printing, the upper limit of suitable viscosity is approximately 2 mPa-s (200 cP). Very preferable, the occlusive composition has a viscosity of about 1 mPa-s (100 cP) at a temperature in the range of 40 ° C to 90 ° C, so that the composition can be extinguished on contact with the paper after printing by intaglio printing. that temperature. The viscosity of the composition at room temperature is also important. The high viscosity at room temperature is necessary so that the occlusive composition gels at room temperature. Preferably, the fringed regions are applied to the envelope using a printing process by subsequent intaglio printing. The intaglio printing operations are capable of accurate recording of successive printing operations. Accordingly, intaglio printing can be used to effectively print not only the first layer of the franginated regions but also the optional successive layers. In a successive intaglio printing process, preferably after the first layer is applied to the base web, it is allowed to dry on it using suitable arrangements, before being advanced to a second printing station by intaglio where a second The layer is applied to the first layer using conventional successive step-by-step printing equipment. Preferably, the second layer is coextensive with the first layer in both width and length; however, the second layer may have a different basis weight in grams per square meter than the first layer. The occlusive composition of the second layer gels in the coldest first layer - and the free water does not migrate or is absorbed by the paper. Preferably, the second layer is allowed to dry using the appropriate arrangements before being advanced to successive intaglio printing stations, where the successive layer or layers are applied. Preferably, the successive layer (s) are extensive with the previous layer (s) in both width and length (ie, the layers do not have a stepped appearance); however, the successive layer (s) may have different basis weight in grams per square meter than the previous layer (s) or may comprise different addition compositions. Preferably, the successive layer or layers are preferably allowed to dry after each successive layer in accordance with well-known intaglio printing techniques and conventional intaglio printing systems. The intaglio printing process can be used immediately following papermaking, that is, at a printing station at a location near the end of the papermaking machine. Alternatively, the intaglio printing process can be used in connection with reels that carry the envelope on which the fringed regions are to be printed. For example, a wrapping spool having a selected permeability and a selected basis weight is mounted so that the wrapping can be unwound from the core as a continuous base web. The base frame advances or passes through a first engraving station where the first layer of each fringed region is printed on the paper. The printing process can be applied to either the fillet side or the wire side of the paper, or both. Next, the wrapping passes through a second intaglio printing station where a second layer of each fringed region is printed on the corresponding first layer. The additional layers are applied in a similar manner as described. Finally, the wrapping with the printed fringed regions is rolled up on a collection reel. The collection reel is then cut into coils. The coils are then used during the manufacture of the desired smoking article in conventional tobacco bar making machines. The apparatus in each of the printing presses by intaglio is essentially the same in its material aspects. Accordingly, it will suffice to describe one of the intaglio printing stations in detail, it being understood that the other intaglio printing stations have common characteristics, unless otherwise noted. A simple step technique can be used to make the paper fringed instead of a multi-step technique. In the first intaglio printing station, the apparatus includes a cylinder or engraving roller generally mounted for rotation about a horizontal axis. The generally cylindrical surface of the roller has some pattern (ie points, lines, cells, etc.) in a suitable process to define a negative of the first layer of franginated regions. Conventional engraving (engraving), chemical engraving, electronic engraving and engraved photo can be used to put pattern on the surface of the engraving cylinder. The circumference of the roller is determined to be an integral multiple of the sum of the nominal distance between fringed regions plus the fringed region width. In this way, for each revolution of the roller, that integral number of first layers of the fringed regions is printed on the envelope. With intaglio printing, although each layer of addition material can be applied uniformly, each layer of addition material does not need to be applied uniformly. For example, a layer of addition material may be applied so that the discrete portions of the layer have different weights in grams per square meter than other areas of the layer. This can be achieved, for example, when printing a discrete portion of the layer having a different weight bse than other areas of the layer in a separate printing step using addition material having a different basis weight. Alternatively, a layer of addition material may be applied so that discrete portions of the layer have a different depth than other areas of the layer. The multiple zones, eg, first, second and third zones, of the fringed regions described herein can be applied in a single printing stage or multiple printing stages. When applied in multiple stages of printing, each zone containing addition material can be applied in a separate printing step. For example, for a fringed region containing first, second and third zones, where only the first and third zones contain addition material, the first zone can be applied in a first printing step and the third zone can be applied in a second region. printing stage. Alternatively, when applied in a single printing step, the zones containing addition material are applied using an appropriately patterned cylinder or pattern roller. For example, for a fringed region containing first, second and third zones, wherein only the first and third zones contain addition material, the cylinder or chalcography roller is made a pattern in order to apply addition material only in the first and third zones. A printing cylinder is mounted for counter-rotation on an axis parallel to the axis of the roller. In some applications, the impression cylinder includes a non-metallic resilient surface. The impression cylinder is positioned between the roller and a rear roller, which is also mounted for rotation on an axis parallel to the axis of the roller and which counter-rotates in relation to the printing cylinder. One of the functions provided by the back roller is to harden the central portions of the printing cylinder so that the uniform printing pressure is achieved between the roller and the printing cylinder. The cylinder or tracing roller and the printing cylinder cooperate to define a pinch through which the base web advances during the printing process. That pinch is sized to pellet the base web as it moves between the intaglio cylinder and the imprecision cylinder. The pinch pressure in the base frame ensures the correct transfer of the composition from the cylinder to the paper. A reservoir contains the occlusive composition discussed above to form fringed regions in the envelope. The reservoir communicates with a suitable pump, which is capable of handling the viscous occlusive composition. The occlusive composition can then flow to a suitable heat exchanger, where the temperature of the occlusive composition is high such that it falls in the range of about 40 to about 90 ° C, so that the viscosity of the occlusive composition is adjusted to a level which is suitable for printing by intaglio. As discussed above, the viscosity for intaglio printing usually needs less than about 200 cP. Preferably, the temperature of the occlusive composition is selected such that the viscosity is less than about 100 cP. Although a separate heat exchanger is described, it may be desirable to provide thermal conditioning of the occlusive composition in the reservoir itself. For example, heating elements and stirring apparatuses may be included in the reservoir to maintain the elevated temperature for the occlusive composition. The placement of thermal conditioning in the tank has the advantage of making pump selection and operation requirements simpler because the pump does not need the occlusive composition at the higher viscosity associated with lower temperatures because the occlusive composition would already be hot and therefore, at the lowest viscosity. If thermal conditioning occurs in the tank or in a separate heat exchanger, it is important that the thermal conditioning step occurs at a selected temperature to avoid scorching the occlusive composition. Scorching can cause discoloration of the occlusive composition and can affect the occlusive characteristics of the composition. Thus, scorching will be avoided while the occlusive composition is subjected to thermal conditioning. Regardless of where the thermal conditioning step occurs, the heated occlusive composition is delivered to a suitable applicator that spreads the occlusive composition along the length of the intaglio cylinder. This step of spreading can be effected by emptying or atomizing the occlusive composition on the intaglio cylinder or simply by delivering the liquid occlusive composition to a bath of occlusive composition that is collected at the bottom of the intaglio cylinder between the intaglio cylinder and a manifold. The cylinder can be heated to prevent premature cooling of the composition. In general, the collector extends vertically around the chalcography roller at a height sufficient to collect the bath, but at a height well below the upper part of the intaglio cylinder. When the bath reaches the top of the collector, the occlusive composition can flow through a drain in the lower part of the apparatus back into the tank. Thus, the occlusive composition circulates through the printing station and can be maintained at suitable printing viscosity by the thermal conditioning apparatus discussed above. As the intaglio cylinder rotates through the applicator and / or the bath, the occlusive composition adheres to the surface of the intaglio cylinder, including in the impressions provided herein to define the fringed regions. Additional rotation of the chalcography cylinder towards the pinch moves the cylinder surface passing a suitable scalpel. The scalpel extends along the length of the intaglio cylinder and is positioned so that it cleans the surface of the intaglio cylinder. In this manner, those portions of the chalcography cylinder that define the nominal spacing between adjacent fringed regions are essentially cleansed of the occlusive composition, although chalcographed portions of the chalcography cylinder defining the fringed regions by themselves advance toward full pinching of the composition. stop. As the casing and the surface of the intaglio cylinder move through the pinch, the occlusive composition is transferred to the surface of the casing. The linear velocity or velocity of the envelope equals the tangential surface velocity of both the intaglio cylinder and the impression cylinder as the sheath passes through the pinch. In that way, the sliding and / or smearing of the occlusive composition on the envelope are avoided. The thickness of the multilayer fringed regions is preferably less than about 2% of the thickness of the base web, and may be less than 5% of the thickness of the base web. The thickness of the first layer of the fringed region applied in the first intaglio printing station is preferably less than 4% of the base frame thickness, and may be less than 1% of the base frame thickness. In this way, it is seen that the thickness of the first layer is small in relation to the thickness of the underlying base web. FIG. 5 is a schematic view of a multi-stage printing apparatus, FIG. 5 illustrates a spool 4, first intaglio printing station 42, second intaglio printing station 44, third intaglio printing station 46, picking spool 48, rollers 50, printing cylinder 52, rear roller 54, pinching 56, reservoir 58, pump 60, heat exchanger 62, applicator 64, bath 6, manifold 67, drain 68, scalpel 70, adjustment cylinders 72 and guide roller 74. In FIG. 5, characteristics of the first intaglio printing station 42 contain reference numerals with the suffix "a", corresponding characteristics of the second intaglio printing station 44 contain the same reference number with the suffix "b" and corresponding characteristics of the third printing printing station 46 contain the same reference number with the suffix "c".

EXAMPLES The following examples are intended to be non-limiting and are merely illustrative. Cigarettes of five different casings (deicr, casings with five configurations of different fringed regions), were tested for ignition propensity ("I P") and self-extinction ("SE") at 0o (horizontal). The base web of each of the wraps has a permeability of 33 CORESTA and a base weight of 25 g / m2. As used herein "I P" refers to total burning through a cigarette. Accordingly, an IP value of 0% indicates that 0% of the tested ciarrillos exhibited total burn through, an IP value of 2.5% indicates that 2.5% of the cigarettes tested exhibited total burn through, a value of IP of 5% indicates that 5% of the tested cranberries exhibited total burned through. As used herein, "SE" refers to self-extinction under free-burning conditions. Thus, for example, an ES value of 95% indicates that 95% of the cigarettes tested exhibited self-extinction under free-burning conditions, although an SE value of 20% indicates that 20% of the cigarettes tested exhibited auto -extinction under conditions of free burning.

Table 1 * The numbers refer to the zone widths in mm (see 2-5, below) Referring to Table 1, casing A was a control comprising a printed, solid, continuous, 6 mm fringed region, having an addition rate of 5.5x. As used herein, a rate of addition of 5.5x results in 8 g / m2 to 9 g / m2 of addition material in a base in dry weight, and a basis weight of 26.5 g / m2 for fringed regions of 6. mm with a 27 mm phase (i.e., the separation of the leading edge from a region fringed to the leading edge of the next fringed region) applied to the base web with a basis weight of 25 g / m2.

Table 2 - Details of the envelope B Table 3 - Details of the envelope C Table 4 - Details of the envelope D Zone 1 Zone 2 Zone 3 Width 2 mm 2 mm 2 mm Layers of addition material 2 2 2 Addition speed per layer 1 .5x / 4x 1 .5x / 2x 1 .5x / 4x Total addition material 5.5x 3.5x 5.5x Table 5 - Details of the envelope E As compared to a control envelope A, casings B-E exhibited the desired reduction in SE while maintaining IP (ie, without significantly increasing I P). In particular, wrap B exhibited an improvement over control wrap A, as evidenced by the decrease in SE average from 95% to 60%. In addition, comparing casings B and D, it can be seen that increasing the width of the second zone from 1 mm to 2 mm, the SE average decreased from 60% to 25% (while maintaining the value of I P approximately). Thus, the width of the second zone is preferably greater than 1 mm, preferably approximately 1.5 mm or approximately 2 mm. Although good results were also shown by the C envelope, which exhibited an average SE of 45%, the best results were shown by the E envelope, which exhibited an average SE of 25%. It should be noted that the envelope E, having a fringed region comprising first, second, third, fourth and fifth zones, and which showed the best results, had second and fourth zones of 1 mm of greater permeability. In contrast, casing B, having a fringed region comprising only first, second and third zones, with a second zone of 1 mm of greater permeabildiad, did not perform as well. Thus, the envelopes having fringed regions comprising only first, second and third zones preferably have wider areas of higher permeability (i.e., about 1.5 mm or about 2 mm) than areas of higher permeability of envelopes having fringed regions comprising first, second, third, fourth and fifth zones. The terms and phases used herein are not intended to be interpreted with mathematical or geometric precision, but the goometric terminology will be interpreted as meaning roughly or similar to geometric terms and concepts. Terms such as "generally" are intended to encompass both precise meanings of the associated terms and concepts as well as to provide a reasonable latitude that is consistent with form, function and / or meaning. Although various modalities have been described, it is understood that variations and modifications may be frequent as will be apparent to those skilled in the art. For example, the modalities are described as having slots preferably 1 mm to 2 mm wide; other modalities could be constructed with grooves from 1 mm to 3 mm wide. Such variations and modifications will be considered within the scope and scope of the remarks appended hereto.

Claims

REVIVAL NAME IS 1 . A wrapping of a smoking article, comprising: a base frame; and at least one transverse fringed region comprising first, second and third zones, said first and third zones comprising addition material, which reduces the permeability of said envelope; said first and third zones each have a width so that if any of said first or third zone were applied separately to wrappers of smoking articles, smoking articles would exhibit statistically significant occurrences of total burn through and statistically few or no occurrence of self-extinction under burning conditions; the sum of said widths of said first and third zones being such that if the first and third zones were applied to wrappers of smoking articles as a single continuous band, the articles to be fired would exhibit statistically few or no occurrence of total burn through and statistically significant occurrences of self-extinction under free-burning conditions, said first and third zones being separated by said second zone, said envelope having greater permeability throughout said second zone than along said first and third zones, said second zone has a width smaller than and wide of said first and third zones, so that smoking articles comprise said first, second and third zones exhibiting statistically reduced occurrences of self-extinction under free-burning conditions, as compare with smoking items comprising wraps on which the first one applies and you rcera zones as a single continuous band, while statistically remain few or no occurrence of total burn through. The wrapping of claim 1, wherein the first and third zones have a greater basis weight in grams per square meter than the second zone. The wrapping of claim 2, wherein the basis weight in grams per square meter of the first and third zones is at least twice the base weight in grams per square meter of the second zone. 4. The casing of claim 1, wherein the second zone comprises an opening. The casing of claim 1, wherein the casing comprises iron oxide at the location of the second zone. The casing of claim 1, wherein the first and third zones comprise addition material, which is uniform through each of the first and third zones. The casing of claim 1, wherein the at least one transverse fringed region comprises a first printed layer that contacts the base web and a second printed layer in the first printed ply. The wrapping of claim 1, wherein the first and third zones each comprise at least three or four printed layers. 9. A wrapping of a smoking article, comprising: a base web; and a transverse fringed region of addition material, said transverse fringed region sufficient to cause extinction of smoking articles comprising said transverse fringed region when left on a substrate, the casing further comprises at least one intermediate, air-permeable region throughout of said cross-sectional region, so that the occurrences of self-extinctions of smoking articles comprising said envelope is statistically reduced over those without said intermediate zone. The casing of claim 9, wherein the at least one intermediate region, permeable to air, comprises an opening. eleven . The wrapping of claim 9, wherein the intermediate, air-permeable zone comprises a simple printed layer and the region of addition material comprises at least two printed layers. 12. A wrapping of a smoking article, comprising: a base frame; and at least one transverse fringed region comprising first, second and third zones in the base frame, wherein the first and third zones are out of the second zone, and wherein the second zone has a greater permeability compared to the first and third zones. third zones. The wrapping of claim 1 2, wherein non-fringed areas of the base web are not printed. 14. A wrapping of a smoking article, comprising: a base frame; and at least one transverse fringed region comprising first, second and third zones in the base web, wherein the first and third zones are out of the second zone, wherein the second zone has a greater permeability compared to the first and third zones. zones; and wherein the second zone and the first and third zones comprise addition material. 5. A smoking article comprising the wrapper of claim 1, 9, 12 or 14. 16. A method for making a fringed wrapper of a smoking article, comprising: supplying a base web; and forming at least one transverse fringed region comprising first, second and third zones in the base frame; wherein the first and third zones are out of the second zone, wherein the second zone has a greater permeability compared to the first and third zones, and wherein at least the first and third zones are formed from a material of free addition of fillers. The method of claim 16, comprising forming at least the first and third zones by printing a first printed layer of addition material on the base web. 18. The method of claim 16, which comprises adding less addition material in the second zone than in the first and third zones. The method of claim 1 8, wherein the first and third zones have a higher basis weight in grams per square meter than the second zone. The method of claim 16, wherein the basis weight in grams per square meter of the first and third zones is at least twice the base weight in grams per square meter of the second zone. twenty-one . The method of claim 1 8, comprising forming the second zone and the first and third zones by printing a first printed layer of addition material in the base web. 22. The material of claim 16, wherein the at least one transverse fringed region is formed by printing an occlusive material on the base web. 23. The method of claim 22, wherein the printing comprises: heating the occlusive material; apply the heated occlusive material to a patterned cylinder; contact the wrapping in advance with the cylinder of pattern intaglio; and gelling the occlusive material by contact with the wrapping surface so that the occlusive material does not break the planarity of the wrapping. 24. An envelope with grooved fringed regions comprises first, second, third, fourth and fifth zones, wherein the second and fourth zones have greater permeability than the first, third and fifth zones, which comprise addition material. 25. A method for reducing the effect on at least one smoke constituent when adding a fringed region to an existing design of a smoking article, said method comprising the step of adding an intermediate zone of increased permeability to said fringed region.