KR20090007380A - Slit banded paper - Google Patents

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

Slit banded paper {SLIT BANDED PAPER}

The present invention relates to a wrapping paper of a smoking article comprising a slit banded region and a method of making the same.

The slit banded paper of the present invention facilitates the use of wrapping paper having a lower permeability for a given level of CO than conventional designs of banded paper. For example, if a previous version of the band was provided without further changes, several situations have been found in which cigarettes containing paper with 33 Coresta permeability and 11 mg CO (FTC) transport rate produce 15 mg CO (FTC). . To offset its increase, the permeability of the wrapper would have to be increased to about 46 Coresta. Such changes are influenced by, for example, the number of cigarettes smoked and possibly result in several cigarette designs, such as mechanically making paper smaller. On the other hand, slit banded paper having a permeability of 33 Coresta fed 12 mg CO (FTC). Thus, the ignited banding band technology described herein facilitates the application of bands with weaker impact at CO level (FTC).

summary

In a first embodiment, a wrapping of a smoking article is provided that includes a base web and one or more transverse banding regions that include first, second, and third zones. The first and third zones contain additives that reduce the permeability of the wrapper. If the first and third zones, respectively, are applied to the packaging of smoking articles separately either one of the first or third zones, the smoking article exhibits a statistically significant occurrence of total burn through and free combustion conditions It has a width such that it shows statistically little or no occurrence of self-extinguishing. The sum of the widths of the first and third zones is applied to the wrapper of smoking articles as a single continuous band (without slits or other discontinuities), so that the smoking article does not show statistically little or no occurrence of a complete combustion pass and free combustion It is a degree that indicates the occurrence of statistically significant self-extinguishing under conditions. The first and third zones are separated by the second zone. The wrapper has greater permeability along the second zone than the first and third zones. Since the second zone has a width that is narrower or the same as the width of either one of the first and third zones, the ignited smoking article comprising the first, second and third zones statistically shows little or no passage of complete combustion. While not occurring, it shows a statistically reduced occurrence of self-extinguishing under free combustion conditions when compared to smoking articles comprising wrapping paper where the first and third zones are applied as a single continuous band.

In a second embodiment, a wrapping of a smoking article is provided that includes a transverse banding area with a base sheet and additives. The transverse banding area is sufficient to cause digestion of a smoking article that includes the transverse banding area when placed on the substrate. The wrapper also includes one or more breathable, intervening zones with a transverse banding area where the occurrence of self-extinguishing of smoking articles including the wrapper is statistically reduced in areas other than the intervening zone.

In a third embodiment, a wrapping of a smoking article is provided that includes a base paper and one or more transverse banding regions including first, second, and third zones thereon. At least one transverse banding region is free of filler. The first and third zones are outside of the second zone, and the second zone has greater permeability than the first and third zones.

In a fourth embodiment, a wrapping of a smoking article is provided that includes a base paper and one or more transverse banding regions including first, second, and third zones thereon. The first and third zones are outside of the second zone, the second zone has greater permeability than the first and third zones, and the second and third zones contain additives.

In a fifth embodiment, manufacturing a banded wrapper for smoking articles comprising supplying a base sheet and forming at least one transverse banding region including first, second, and third zones on the base sheet. A method is provided. The first and third zones are outside of the second zone, the second zone has greater permeability than the first and third zones, and at least the first and third zones are made of additives without fillers, and optional Thus at least one of the zones is formed at least in part from an additive comprising a filler.

In a sixth embodiment, a method of making a banded wrapper for a smoking article comprising supplying a base sheet and forming one or more transverse banding regions including first, second, and third zones on the base sheet. This is provided. The first and third zones are outside of the second zone, the second zone has greater permeability than the first and third zones, and the second and third zones are formed of additives.

details

Preferably, the smoking article digests when placed on a substrate, and this trend is referred to herein as a smoking article having a "low ignition tendency". Theoretically, low-trend smoking articles will continue to burn even when they are freely hung in an ashtray container or held in the hand without smoking (“free combustion”). Many conventional cigarette designs that achieve low ignition tendency requirements exhibit high self-extinguishing rates even under free ignition conditions.

As used herein, the expression "total burn through" refers to the American Society for Testing and Materials, which measures the ability of cigarettes wrapped in ignited band paper, disposed on a combustible substrate to continue ignition without smoking. ASTM) Standard E2187-04, "Standard Test Method for Measuring the Ignition of Cigarettes". Thus, "complete burn-through" refers to a situation where the coal passes completely through the banded area on the cigarette wrapper and does not cause digestion of the ignited cigarette. Also, as used herein, the expression “self-extinguishing under free combustion conditions” or “self-extinguishing under free combustion conditions” refers to extinguishing a ignited cigarette without smoking a cigarette when the cigarette is under free combustion conditions. Means that.

The banded region described herein exhibits a low self-extinguishing rate as well as a low ignition tendency under free combustion conditions. The banded area is preferably formed by printing, in particular gravure printing, as described in detail below. As an alternative to printing, the banding area is applied using the operating holes of the forming part of the paper-maker as described in the sharing rights US 5 997 691 and US 6 596 125 (the entire contents of which are incorporated herein by reference). Slurries of highly purified fibrous cellulose (eg, fibers, fibrils, microfibrils or mixtures thereof) or other additives applied using various spraying or coating techniques, including techniques.

 In another embodiment, the banded region can include first, second and third zones with additives that can be applied to any of the methods disclosed herein, wherein the second zones are agents having increased permeability. In order to provide two zones, it preferably comprises a perforation filled with occluding material which melts or evaporates when the burning char is reached in the banding zone.

Accordingly, a wrapper of smoking articles is provided that includes a base sheet and one or more transverse banding regions that include first, second, and third zones. The first and third zones contain additives that reduce the permeability of the wrapper. The first and third zones, respectively, when either one of the first or third zones are separately applied to the wrapping of the smoking article, the smoking article exhibits a statistically significant occurrence of a complete combustion passage or under self-combustion conditions. It has a breadth that will not show statistically little or no occurrence of combustion (eg after testing a batch of 20-50 cigarettes). The sum of the widths of the first and third zones indicates that when the zone is applied to the wrapping of the smoking article as a single continuous band (without slit or other discontinuity), the smoking article does not statistically indicate little or no occurrence of a complete combustion pass and free combustion It is a degree that indicates the occurrence of statistically significant self-extinguishing under conditions. The first and third zones are separated by the second zone. The second zone contains less or no additives than the first and third zones. The wrapper has higher permeability along the second zone than the first and third zones. While the second zone remains statistically little or no occurrence of a complete combustion pass, the second zone, when compared to a smoking article comprising a wrapper wherein the first, second and third zones are applied as a single continuous band on the wrapper, A fired smoking article comprising zones 1, 2, and 3 has a narrower width (the same or unequal width) than either of the zones 1 and 3 to indicate a statistically reduced occurrence of self-extinguishing under free combustion conditions. Can have). Preferably, the first and third zones have a constant additive intersecting the first and third zones. Optionally, the second zone can have an essentially the same width as the first and third zones.

In the case of the banded region, the total amount of the additive is preferably in the range of about 0.5 grams (g / m ² ) to 15 g / m ² , more preferably in the range of 0.5 g / m ² to 3 g / m ² , even more preferably per square meter. It is in the range of 0.5 g / m ² to 1.5 g / m ² . Conventional cigarette paper is generally permeable with a permeability commonly referred to as CORESTA, which measures paper permeability in terms of volume flow rate (cm ³ / sec) per unit area (cm ² ) per unit pressure drop (cm of water). Do. The permeability of cigarette paper generally exceeds 20 Coresta, preferably the cigarette paper has a permeability of about 33 to about 60 Coresta and a basis weight of about 22 g / m ² , 30 g / m ² . However, the permeability through the banded region and the lower cigarette paper is preferably in the range of 0 to 15 Coresta. The reduction in permeability preferably limits the air flow needed to sustain combustion of the cigarette char near the banding area.

The first and third zones preferably have a basis weight (g / m ² ) greater than the intermediate second zone; For example, the first and the basis weight (g / m ²⁾ of the third zone may be at least twice the basis weight (g / m ²⁾ of the second zone. The second zone may comprise a gap. As used herein, the term “gap” refers to the discontinuous portion of the banded region between the first and third zones lacking any permeability reducing additives (ie, containing no additive layer reducing permeability). Means. To facilitate combustion of the second zone, the wrapper may include iron oxide at the location of the second zone. The second zone preferably has greater permeability than the first and third zones.

The at least one transverse banding area is preferably a first printing layer in contact with the base paper and a second printing layer having a basis weight (g / m ² ) greater than or equal to the first printing layer, preferably on the first printing layer. It includes. However, the second and / or subsequent layers may have a basis weight less than the first layer. For example, the second basic weight (g / m ²⁾ of the printed layer may be at least twice that of the base of the first print layer weight (g / m ^2). In an embodiment, the second zone may comprise a single printed layer and the first and third layers may each comprise two or more printed layers (more preferably three or more layers). Optionally, the first and third zones may each comprise three or four or more printed layers, and the second zone may include only one or two printed layers or no printed layers. .

The non-band portion of the base paper preferably contains no permeability reduction additives. As described below with reference to FIG. 2, the transverse banding region comprises three or more zones. For example, the transverse banding region is for example five zones having second and fourth zones separating the first, third and fifth zones and second rather than first, third and fifth zones. And wrappers having greater coherency along the fourth zone.

Also provided is a wrapping of a smoking article comprising a transverse banding area with a base sheet and additives. The transverse banding area is designed to cause extinguishing of a smoking article that includes the transverse banding area when placed on the substrate. The wrapper also includes a more permeable mediated zone having a transverse banding area where the occurrence of self-extinguishing of the smoking article comprising the wrapper is statistically reduced in areas other than the mediated zone.

In a further embodiment, the wrapping of the smoking article includes a base paper and one or more transverse banding areas including first, second and third zones on the base paper. The one or more transverse banding regions may be free of filler and optionally one or more of the zones are formed of at least part of an additive comprising the filler. The additive preferably crosses the first and third zones evenly. The first and third zones are outside of the second zone and the overall wrapper structure of the second zone has greater permeability than the overall wrapper structure in the first and third zones.

In addition, a wrapping of a smoking article is provided that includes a base paper and one or more lateral banding regions that include first, second, and third zones on the base paper. The first and third zones are outside of the second zone, the second zone has greater permeability than the first and third zones, and the second and third zones contain additives.

The wrapping paper of the present invention is preferably supplied on bobbins, and the wrapping paper on the bobbin preferably comprises a series of transverse banding areas which are constantly spaced apart or repeat in the transverse banding areas.

Also provided is a method of making a band wrap of a smoking article comprising supplying a base sheet and forming at least one transverse banding region comprising first, second and third zones on the base sheet. The first and third zones are outside of the second zone, the second zone has greater permeability than the first and third zones, and at least the first and third zones are made of additives without filler. Optionally at least one of the zones is formed of an additive comprising at least partially a filler. The additive is preferably uniform through the first and third zones.

Also provided is a method of making a band wrap of a smoking article, the method comprising supplying a base sheet and forming one or more transverse banding regions comprising first, second and third zones on the base sheet. The first and third zones are outside of the second zone, the second zone has greater permeability than the first and third zones, and the second and third zones are made of additives. Optionally at least one of the zones is formed of an additive comprising at least partially a filler. The additive is preferably uniform through the first and third zones.

1-3 illustrate smoking articles comprising slit banded paper as described herein. Specifically, FIG. 1 includes two, including first and third zones 11, 13 with additives, separated by second zone 12, which may each be in the form of a gap or in the form of reduced additive zones. A smoking article with two banded regions 10 is shown. The first and third zones 11, 13 with additives may be, for example, about 2 mm to about 5 mm wide, preferably about 2 mm to 3 mm wide, and the second zone 12 is about 1 mm wide, for example. To 2 mm wide. More specifically, the first and third zones 11, 13 with additives may each be about 3 mm wide, for example, and the second zone 12 may be about 1.5 mm or 2 mm wide, for example. have. The first and third zones 11, 13 with additives preferably comprise multiple layers of additives, for example two, three or four additive layers. The additive is preferably uniform through the first and third zones 11, 13.

2 shows the first, third and fifth zones 21, 23, 25 with additives separated into second and fourth zones 22, 24 which may be in the form of gaps or in the form of reduced additive levels. And a smoking article having two banded regions 20 each comprising a). The first, third and fifth zones 21, 23, 25 with additives may each be, for example, 2 mm to 3 mm wide, and the second and fourth zones 22, 24 are each about 1 mm to 2 mm wide. Can be the width of More preferably, the first, third and fifth zones 21, 23, 25 with additives may each be about 2 mm wide, for example, and the second and fourth zones 22, 24 may each be an example. For example, the width may be about 1 mm or less. The first, third and fifth zones 21, 23, 25 with additives preferably comprise multiple additive layers, for example two, three or four additive layers. The additive is preferably uniform through the first, third and fifth zones 21, 23, 25.

3 shows a smoking article having two banded regions 30, each comprising first and third zones 31, 33 with additives separated by a second zone with less additive 32. Illustrated. The first and third zones 31, 33 with additives may each be about 2 mm to 3 mm wide, for example, and the second zone 32 with less additives may be about 1 mm to 2 mm wide, for example. Can be. More preferably, the first and third zones 31, 33 with additives may each be about 3 mm wide, for example, and the second zone with less additives may be up to about 2 mm, for example. The first and third zones 31, 33 with additives preferably comprise multiple additive layers, for example two, three or four additive layers, while the second zone 32 with less additives is present. Silver may comprise, for example, one or two additive layers. The additive is preferably uniform through the first and third zones 31, 33. The second zone 32 is effective at a width of 1 mm, but the embodiment performs well at a width of at least 1.2 mm.

1 to 3, slit banded paper facilitates the use of a low permeability wrapper for a given level of CO than conventional designs of banded paper. For example, if a previous version of the band was provided without further changes, several situations have been found in which cigarettes containing paper with 33 Coresta permeability and 11 mg CO (FTC) transport rate produce 15 mg CO (FTC). . To offset its increase, the permeability of the wrapper would have to be increased to about 46 Coresta. Such changes are influenced by, for example, the number of cigarettes smoked and possibly result in several cigarette designs, such as mechanically making paper smaller. On the other hand, slit banded paper having a permeability of 33 Coresta fed 12 mg CO (FTC). Thus, the ignited banding band technology described herein facilitates the application of bands with weaker impact at CO level (FTC).

4 and 5, additional embodiments may include banding regions, the zones extending longitudinally rather than circumferentially. More specifically, FIG. 4 corresponds to the banding region configuration of FIG. 2 with regions extending longitudinally rather than circumferentially, and FIG. 5 shows banding of FIG. 3 with regions extending longitudinally rather than circumferentially. Corresponds to the area configuration.

In a preferred embodiment, the first layer of each banded region is formed using an aqueous occlusive composition that extends completely across the banded region. The continuous layer (or layers) of each banded region may be formed using the same aqueous film forming composition or other aqueous composition. For example, the multiple layers can all comprise layers containing only starch, or the multiple layers can comprise at least one layer all containing starch and one or more layers (in any order) containing calcium carbonate. . During gravure printing, the permeable composition is preferably heated at a temperature whose viscosity is within the viscosity range suitable for gravure printing. Once the heated permeable composition is applied, the permeable composition can be cooled or cooled and gelatinized. Thus, the free water portion of the permeable composition becomes trapped and incapable of seeping or moving into the underlying fibers of the base paper. The combination of rational numbers inhibits the formation of bending, wrinkling and / or wrinkling of the base sheet. The continuous layer of banded regions preferably has an increased thickness in proportion to the first layer. The banded zone preferably reduces the permeability of the underlying base paper, which limits the air flow needed to compensate for the burning of cigarette charcoal near the banded zone. For further explanation of progressive multi-pass printing, see Sharing Rights U.S., entitled Progressive Multi-Pass Printing Banding Paper, filed August 15, 2005. Provisional Application No. 60 / 707,964, the entire contents of which are incorporated herein by reference.

The occlusive composition used in the occlusive composition may be selected from the group consisting of starch, alginic acid, 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 an embodiment, the permeable composition preferably contains no fillers, such as calcium carbonate, which may, for example, increase the burning rate through the banding zone. In a more preferred embodiment, the permeable composition used for printing comprises water and comprises about 20% to about 50% by weight of the permeable composition. In higher concentrations of the permeable composition of the composition, the composition may experience gelatinization when its temperature drops sharply. Thus, the coupling of free numbers to the printed banding area can occur.

At room temperature (about 23 ° C.), the high-solids-content occlusive composition has a viscosity exceeding about 2 mPa · s (200 centipoise (cP)) and is not suitable for gravure printing; However, at temperatures ranging from about 40 ° C. to about 90 ° C., the viscosity of the permeable composition is sufficiently reduced for use with the gravure printing composition. For gravure printing, the upper limit of suitable viscosity is about 2 mPa · s (200 cP). Most preferably, the permeable composition has a viscosity of about 1 mPa · s (100 cP) at that temperature so that the composition can be cooled in contact with paper after gravure printing in the temperature range of 40 ° C. to 90 ° C. The viscosity of the composition at room temperature is also important. High viscosity at room temperature is required to gel the permeable composition at room temperature.

Preferably, the banded area is applied to the wrapper using a continuous gravure printing process. A gravure print job can match the print surface inside and outside the correct continuous print job. Thus, gravure printing can be used to efficiently print an arbitrary continuous layer as well as the first layer of banded regions.

In the continuous gravure printing process, preferably after the first layer is applied to the base sheet, before proceeding to the second gravure printing station applying the second layer to the first layer using a conventional continuous-pass gravure printing mechanism, It may be dried thereon using a suitable device. Preferably, the second layer extends the same in width and length as the first layer; However, the second layer may have a basis weight (g / m ² ) different from the first layer. The permeable composition of the second layer gels on the cooler first layer and free water does not migrate or be absorbed into the paper. Preferably, the second layer may be dried using a suitable apparatus before proceeding to the continuous gravure printing station (s) to which the continuous layer (s) are applied. Preferably, the continuous layer (s) extend both the width and the length (ie, the layer does not have a step shape) equal to the previous layer (s); However, the continuous layer (s) may have a basis weight (g / m ² ) different from the previous layer (s) and may include other additives. Preferably, the continuous layer (s) may be dried after printing of each continuous layer, preferably according to known gravure printing techniques and conventional gravure printing systems.

The gravure printing process can be used in the subsequent paper making, ie in the printing section located near the end of the paper maker. Alternatively, the gravure printing process can be used with a reel to deliver the wrapping paper where the banded area will be printed. For example, a reel of wrapping paper having the selected permeability and the selected basis weight is installed such that the wrapping paper is released from the reel as a continuous base paper.

The base sheet passes or passes through a first gravure printing station where a first layer of each banded area is printed on the paper. The printing process can be applied to the felt side, the wire side, or both of the paper. The wrapper then passes through a second gravure printing station where a second layer of each banded region is printed over the corresponding first layer. Additional layers are applied in a similar manner as described. Finally, the wrapper with the printed banding area is wound around a collection reel. The recovery reel is then cut into bobbins. The bobbin is then used during the manufacture of the desired smoking article in a conventional cigarette maker.

Each device of the gravure printing station is essentially identical in its article aspect. Thus it is sufficient to describe one of the gravure printing stations in detail, and it is understood that other gravure printing stations also have common characteristics unless otherwise stated. Single pass technology can be used to make banded paper instead of multi-pass technology.

In a first gravure printing station, the apparatus comprises a gravure cylinder or a roller which is generally installed for rotation about a vertical axis. In general, the cylindrical surface of the roller is patterned (ie, dots, lines, tissue, etc.) in a process suitable for defining the negative charge of the first layer of the banded region. Conventional engraving (etching), chemical engraving, electrical engraving and photographic etching can be used to pattern the surface of the gravure cylinder. The circumference of the roller is determined by multiple integration of the sum of the nominal distances between the banded area and the banded area width. Thus, in the case of each rotation of the roller, an integer number of first layers of the banded areas are printed on the wrapping paper.

With respect to gravure printing, each additive layer may be applied evenly, but each additive layer need not be applied evenly. For example, the additive layer can be applied such that the discontinuous portion of the layer has a g / m ² different from that of other layers. This can be accomplished, for example, by printing discrete portions of a layer having a basis weight different from other layer portions in a separate printing stage using additives having a different basis content. Optionally, the additive layer may be applied such that the discrete portions of the layers differ in depth compared to other layer portions. This can be achieved, for example, by patterning the gravure cylinder or roller such that a discontinuous portion of the layer has a different depth than the other layer portions.

Multiple Zones For example, the first, second and third zones of the banded region described herein may be applied to a single print stage or multiple print stages. When applied to multiple printing stages, each zone containing additives can be applied to a separate printing step. For example, in the case of a banding zone containing first, second and third zones, only the first and third zones contain additives and the first zone may be applied to the first printing stage and the third zone may be Second printing stage can be applied. Optionally, when applied to a single print stage, the zone containing the additive can be applied using a suitably patterned gravure cylinder or roller. For example, in the case of a banded zone containing the first, second and third zones, only the first and third zones contain additives, and the gravure cylinder or roller only has additives applied to the first and third zones. Patterned as possible.

The pressurizing cylinder is installed for counter-rotating axially parallel on the roller axis. In some applications, the pressurized cylinder includes a nonmetal elastic face. The pressure cylinder is also installed for rotation axially parallel in the axis of the roller and is located between the roller and the back roller which rotate in the reverse direction with respect to the pressure cylinder. One of the functions provided by the back roller is to harden the center of the pressurized cylinder so that a uniform printing pressure is reached between the roller and the pressurized cylinder. Gravure cylinders or rollers and pressure cylinders cooperate to define the nip through which the base sheet passes during the printing process. The nip is sized to fit the base paper while moving between the gravure cylinder and the pressurizing cylinder. The nip pressure on the base paper ensures that the composition is correctly delivered from the cylinder to the paper.

The reservoir contains the aforementioned permeable composition to form a banded region on the wrapper. The reservoir is connected with a suitable pump capable of manipulating the viscous permeable composition. The permeable composition, the permeable composition, may then be introduced into a suitable heat exchanger to increase the temperature of the occlusive composition to be in the range of about 40 ° C. to 90 ° C. such that the viscosity of the permeable composition is adjusted to a level suitable for gravure printing. As mentioned above, for gravure printing the viscosity is generally required to be less than about 200 cP. Preferably, the temperature of the permeable composition is chosen such that the viscosity is less than about 100 cP.

Although a separate heat exchanger is disclosed, it may be desirable to provide the heat treatment of the permeable composition by itself in a reservoir. For example, heat balances and agitators may be included in the reservoir to maintain the high temperature of the permeable composition. The placement of the heat treatment unit in the reservoir has the advantage of simplifying pump selection and operating conditions since the permeable composition is already heated and at low viscosity, so the pump does not have to handle the permeable composition at high viscosities associated with low temperatures. Whether the heat treatment occurs in a reservoir or in a separate heat exchanger, it is important that the heat treatment step occurs at a selected temperature to prevent burning of the permeable composition. Scorching can cause discoloration of the permeable composition and can affect the properties of the occlusive composition. Thus, burning will be avoided while the permeable composition is subject to heat treatment.

Regardless of where the heat treatment step occurs, the heated permeable composition is delivered to a suitable applicator that sprays the permeable composition along the length of the gravure cylinder. The spraying step may be effected by pouring or spraying the penetrating composition onto the gravure cylinder or by simply transferring the liquid penetrating composition to the penetrating composition bath, which is recovered from the bottom of the gravure cylinder between the gravure cylinder and the recovery device. have. The cylinder may be heated to prevent premature cooling of the composition.

Generally, the recoverer extends vertically around the gravure roller to a height sufficient to recover the scrubbing tank, not just below the top of the gravure cylinder. Once the cleaning bath reaches the top of the reclaimer, the permeable composition can flow through the drain at the bottom rear of the device and into the reservoir. The permeable composition thus circulates through the printing station, and a suitable printing viscosity can be maintained by the above-mentioned heat treatment apparatus.

As the gravure cylinder is rotated by the applicator and / or cleaning bath, the permeable composition adheres to the gravure cylinder surface, including the printing provided therein to define the banding area. Another rotation of the gravure cylinder towards the nip moves the cylinder surface past the appropriate doctor blade. The doctor blinder extends along the length of the gravure cylinder and is arranged to wipe the gravure cylinder surface. In this way, the gravure cylinder portion defining the nominal space between adjacent banding regions essentially cleans the permeable composition, while the carved portion of the gravure cylinder defining the banding region is directed toward a nip filled with the permeable composition itself. Proceed.

As the surface of the wrapper and gravure cylinder moves through the nip, the permeable composition is delivered to the surface of the wrapper. The linear velocity or speed of the wrapper is equivalent to the tangential surface speed of the pressurized cylinder as well as the gravure cylinder as the wrapper passes through the nip. In that way, it prevents slipping and / or soiling of the permeable composition on the wrapper.

The thickness of the multilayer banded area is preferably less than about 20% of the base paper thickness and may be less than 5% of the base paper thickness. The thickness of the first layer of the banded area is applied to the first gravure printing station, preferably less than 4% of the base paper thickness, and may be less than 1% of the base paper thickness. Thus, it was found that the thickness of the first layer is smaller than the thickness of the lower base sheet.

5 is a schematic diagram of a multi-stage printed media. Referring to the above-described for multi-stage printing, FIG. 5 shows a reel 40, a first gravure printing station 42, a second gravure printing station 44, a third gravure printing station 46, a retrieval reel ( 48, roller 50, pressure cylinder 52, back roller 54, nip 56, reservoir 58, pump 60, heat exchanger 62, applicator 64, cleaning tank ( 66, recovery device 67, drain port 68, doctor blade 70, adjustment cylinder 72 and idler roller 74. In FIG. 5, the feature of the first gravure printing station 42 has a reference number with the subscript "a" and the corresponding feature of the second gravure print station 44 has the same reference number with the subscript "b". The corresponding feature of the third gravure printing station 46 has the same reference number with the subscript "c".

1-3 illustrate smoking articles comprising slit banded paper as described herein.

4 and 5 illustrate alternative embodiments of smoking articles comprising slit banded paper as described herein.

6 is a schematic diagram of a multi-stage printing apparatus.

Example

The following examples are illustrative only and are not intended to limit the scope of the invention. Cigarettes with five different wrappers (ie, wrappers with five different banding zone configurations) were tested for ignition ("IP") and self-burning ("SE") at 0 ° (horizontal). . The base paper of each wrapping paper had a permeability of 33 Coresta and a basis weight of 25 g / m ² . As used herein, "IP" refers to the complete burning passage of a cigarette. Thus, an IP value of 0% indicates that 0% of the tested cigarettes exhibited a complete combustion pass, a 2.5% IP value indicated that 2.5% of the tested cigarettes exhibited a complete combustion pass, and an IP of 5% The figures indicate that 5% of the cigarettes tested showed a full combustion pass. As used herein, "SE" means self-extinguishing under free combustion conditions. Thus, for example, a 95% SE value indicates that 95% of the tested cigarettes exhibited self-extinguishing under free combustion conditions, while a 20% SE value indicates that 20% of the tested cigarettes under free combustion conditions. Indicates self-extinguishing.

Table 1

* Number indicates zone width in mm (see Tables 2 to 5 below)

Referring to Table 1, Wrapping Paper A was a strip containing a continuous solid 6 mm printed banding area with an addition rate of 5.5 ×. As used herein, the ratio of 5.5x was 8g dry weight of the base / m ² to about 9g / m generates the ^second additive and the base of 26.5g / m ² for the 6mm-banded region having a 27mm by weight (Ie, the space between the leading end of the banded area and the leading end of the next banded area) is applied to the base paper having a basis weight of 25 g / m ² .

Table 2-Detailed description of wrapping paper B

Table 3-Detailed description of wrapping paper C

Table 4-Detailed description of wrapping paper D

Table 5-Detailed description of wrapping paper E

Compared to control wrapper A, wrappers B through E showed a desired decrease in SE while IP was maintained (ie, no significantly increasing IP). In particular, wrapper B showed an improvement over wrapper A, just as the reduction in SE mean from 95% to 60% was demonstrated. In addition, compared to wrappers B and D, it can be seen that by increasing the width of the second zone by 1 mm to 2 mm, the SE average decreased from 60% to 25% (approximately while maintaining the IP value). Thus, the width of the second zone is preferably at least 1 mm, preferably about 1.5 mm or about 2 mm. Good results were also shown by wrapper C, which exhibited an SE average of 45%, but the best results were shown by wrapper E, which represented an SE average of 20%.

It should be noted that the wrapping paper E having a banded area including the first, second, third, fourth and fifth zones showing the best results has 1 mm second and fourth zones with high permeability. On the other hand, wrapping paper B having a banded area including only the first, second and third zones, having a 1 mm second zone with greater permeability, was not performed as such. Therefore, the wrapping paper having the banding area including only the first, second and third zones has a high permeability of the wrapping paper having the banding area including the first, second, third, fourth and fifth zones. It is desirable to have a wide width with higher permeability than the zone (ie about 1.5 mm or 2 mm).

The terms and expressions used herein are not intended to interfere with mathematical or geometrical accuracy, rather the geometric terms will be interpreted as meanings similar to or similar to geometric terms and concepts. Terms such as "typically" are intended to not only provide a reasonable scope consistent with form, function and / or meaning, but also to include all exact meanings of related terms and concepts.

While various embodiments have been described, it will be understood that variations and modifications will be apparent to those skilled in the art. For example, embodiments are described as having slits preferably having a width of 1 mm to 2 mm; Other embodiments may consist of slits of 1 mm to 3 mm width. Such modifications and variations are to be considered within the scope and scope of the invention as appended below.

Claims (25)

Base paper; And A wrapper of a smoking article comprising at least one transverse banding region comprising first, second and third zones, the first and third zones comprising additives that reduce the permeability of the wrapper, Each of the first and third zones, if either one of the first or third zones are individually applied to the wrapper of a smoking article, indicates that the smoking article exhibits a statistically significant occurrence of a complete combustion pass and is free to operate under free combustion conditions. Have a width that is statistically little or no indicative of digestion, The sum of the widths of the first and third zones is such that if the first and third zones are applied to the wrapper of smoking articles as a single continuous band, the smoking article is free to show statistically little or no occurrence of a complete burn passage. The degree of statistically significant occurrence of self-extinguishing under combustion conditions, The first and third zones are separated by the second zone, The wrapper has greater permeability along the second zone than the first and third zones, while the first and third zones serve as a single continuous band, while the occurrence of a complete combustion pass remains statistically little or no. Compared to smoking articles including wrapping paper applied, the fired smoking articles comprising the first, second and third zones exhibit statistically reduced occurrence of self-extinguishing under free combustion conditions. A wrapping paper having a two-zone area having a width smaller than the width of any one of the first and third zones. The wrapper of claim 1, wherein said first and third zones have a basis weight (g / m ² ) greater than said second zone. The method of claim 2, wherein the first and the basis weight (g / m ²⁾ of the third zone is greater than twice the wrapping paper of a basis weight (g / m ²⁾ of the second zone. The wrapper of claim 1 wherein said second zone comprises a gap. The wrapper of claim 1 wherein said wrapper comprises iron oxide at a location in a second zone. The wrapper of claim 1 wherein the first and third zones comprise additives equal through each of the first and third zones. The wrapping paper of claim 1, wherein the at least one lateral banding area comprises a first print layer in contact with the base paper and a second print layer over the first print layer. The wrapper of claim 1 wherein the first and third zones each comprise three or four or more print layers. Base paper; And A wrapper for a smoking article comprising a transverse banding region of an additive, wherein the transverse banding region sufficient to cause digestion of the smoking article includes the transverse banding region when placed over a substrate, The wrapper further comprising one or more breathable, intervening zones along the transverse banding area such that the occurrence of self-extinguishing of a smoking article comprising the wrapper is statistically reduced across areas other than the intervening zone. 10. The wrapper of claim 9 wherein said at least one breathable, intermediary zone comprises a gap. 10. The wrapper of claim 9, wherein the breathable, intervening zone comprises a single print layer and the additive region comprises two or more print layers. Base paper; And A wrapping paper of a smoking article comprising at least one transverse banding area comprising first, second and third zones on a base sheet, the wrapper comprising: The first and third zones are outside of the second zone, and The second zone is wrapper having greater permeability than the first and third zones. 13. The wrapping paper of claim 12, wherein the non-banded area of the base paper is not printed. Base paper; And A wrapping paper of a smoking article comprising at least one transverse banding area comprising first, second and third zones on a base sheet, the wrapper comprising: The first and third zones are outside of the second zone, The second zone has greater permeability than the first and third zones, and Wherein said second zone and said first and third zones comprise an additive. A smoking article comprising the wrapping paper according to any one of claims 1, 9, 12 or 14. Providing a base sheet; And A method of making a band wrapper of smoking articles, the method comprising forming at least one transverse banding region comprising first, second and third zones on a base sheet, the method comprising: The first and third zones are outside of the second zone, The second zone has greater permeability than the first and third zones, and Wherein said at least first and third zones are formed from an additive free of filler. 17. The method of claim 16, comprising printing at least a first and third zone of the additive on a base sheet of printing. The method of claim 16 including adding less additive to the second zone than the first and third zones. 19. The method of claim 18, wherein the first and third zones have a larger basis weight (g / m ² ) than in the second zone. Method according to at least double that of the 16, wherein the first and the third zone basis weight (g / m ²⁾ is basis weight (g / m ²⁾ of the second zone of the. 19. The method of claim 18 including printing a first print layer of additive on the base sheet to form a second zone and first and third zones. 17. The method of claim 16, wherein the one or more lateral banding areas are formed by printing the occlusive material on a base sheet. The method of claim 22, wherein the printing is: Heating the occlusive material; Supplying the heated occluded material to the patterned gravure cylinder; Contacting the patterned gravure cylinder with the ongoing wrapping paper; And Contacting the surface of the wrapping paper with the blocking material so that the blocking material does not interfere with the planarity of the wrapping paper. A wrapper having a slit banding region comprising first, second, third, fourth and fifth zones, wherein the first and fourth zones are more than the first, third and fifth zones containing additives. Wrapping paper with great permeability. A method of reducing the impact on one or more smoking components when adding a banded region to a conventional design of a smoking article, the method comprising adding an intermediate region of increased permeability to the banded region. Way to be.

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