RU141743U1 - CIGAR PAPER WITH GEAR STRIP - Google Patents

Abstract

1. A paper wrapper for a smoking article, comprising: a main web permeable to air; and a strip-like region of added material that reduces the permeability of the wrapper in the strip-like region, the strip-like region including a substantially continuous strip of about 4 mm or less in width, wherein the leading edge of the strip-like region is serrated, the trailing edge of the strip-like region is serrated the front edges are laterally aligned with the recesses of the rear edge, and the notches of the front edge are laterally aligned with the teeth of the rear edge. 2. A wrapper according to claim 1, wherein the teeth of the leading edge have the same lateral dimensions as those of the recesses of the rear edge, and the notches of the leading edge have the same lateral dimensions as those of the teeth of the trailing edge. A wrapper according to claim 1 or 2, wherein, in said strip-like region, the distance between the tips of the teeth of the leading edge and said substantially continuous strip is about 4 mm or less. The wrapper according to claim 1 or 2, in which, in the specified strip-like region, the distance between the tops of the teeth of the front edge and the essentially continuous strip is about 4 mm or less, and the bottom of the notches of the front edge corresponds to the front edge of the specified essentially continuous strip. 5. A wrapper according to claim 1 or 2, in which the notch of the leading edge and the teeth of the leading edge have transverse dimensions that are substantially the same. A smoking article comprising a tobacco rod and a paper wrapper according to any one of claims 1 to 5.7. The smoking article according to claim 6, wherein the wrapper has a transverse length in which the circumference of the tobacco rod is taken into account

Description

BACKGROUND

Attempts have been made to create smoking articles that go out when they are accidentally left outstanding on the substrate, and this quenching tendency on the substrate is called the “low ignition ability of the smoking article”. Ideally, a smoking article with a low ignition ability will continue to burn in a free-hanging state in an ashtray holder or held in a hand without puffs (“free burning”). The tendency for cigarettes to fade during free burning is called “self-extinguishing”. Many prior art cigarette designs that achieve low ignition ability have a high level of undesired self-extinguishing under free-burning conditions. For example, US Published Application 2004/0261805 A1 discloses cigarette wrappers containing strips with added material that reduces the permeability of the wrappers to change the burning characteristics of cigarettes, namely to reduce their ignition ability. However, with a decrease in the permeability of the wrappers, the smoking tendency of self-extinguishing in the conditions of free burning intensifies in smoking articles. US application 2004/0261805 A1 does not pay attention to this problem.

DISCLOSURE OF A USEFUL MODEL

The proposed wrapper for a smoking article eliminates the drawbacks of the prior art due to the fact that it gives the smoking article both a reduced ignition ability and reduced self-extinguishing under conditions of free combustion.

The proposed wrapper for a smoking article contains:

main sheet permeable to air; and

a strip-like region of added material that reduces the permeability of the wrapper in the strip-like region,

moreover, the strip-like region includes a substantially continuous strip with a width of about 4 mm or less,

wherein the front edge of the strip-like region is serrated, the rear edge of the strip-like region is serrated, and the teeth of the front edge are laterally aligned with the recesses of the rear edge, and the notches of the front edge are laterally aligned with the teeth of the rear edge.

The provision of the smoking article with a paper wrapper provided with the above-mentioned strip-like region, including a substantially continuous strip of added material about 4 mm wide or less, with the indicated relative location of the grooves and teeth of the front and rear edges of the strip-like region, can both reduce the ignition ability and reduce the self-extinguishing of the smoking article in conditions of free combustion.

The objectives and advantages of this utility model will be clearer after reading the section of the description of the "Implementation of the utility model" below in connection with the accompanying drawings, in which identical elements indicate the same elements. In the drawings:

Figure 1 is a perspective view of a smoking article with the proposed paper wrapper;

Figure 2 is a schematic view of a paper wrapper having a first embodiment of a toothed strip-like region;

Figure 3 is a schematic view of a paper wrapper having a second embodiment of a toothed strip-like region;

Figure 4 is a schematic view of a paper wrapper having a third embodiment of a toothed stripe-like region.

IMPLEMENTATION OF A USEFUL MODEL

The smoking article 1 includes a tobacco rod 2. The tobacco rod 2 may include a tobacco bag 3 and is surrounded by a paper wrapper 10. One end of the smoking article may include a suitable filter 4 surrounded by cigarette paper. Typically, the smoking article 1 has a substantially circular cross section over its entire length. However, in the scope of the utility model formula, there are other cross-sectional shapes, including, for example, an oval cross-section. Tobacco rod 2 has a nominal length, measured from mouthpiece paper to the free end of the tobacco rod along the longitudinal axis of the smoking article. As an example, this nominal length may be from about 60 mm to about 100 mm.

The paper wrapper 10 includes an air permeable core web. The permeability of paper wrappers is usually expressed in CORESTA units. The CORESTA unit determines the permeability of paper through the volumetric flow rate (i.e. cm ³ / s) per unit area (i.e. cm ² ) per unit pressure drop (i.e. see water column). In addition, the main web for conventional paper wrappers has well-known basic weights, measured in grams per square meter, abbreviated g / m ² . The permeability and basic weight of the base web of typical papers for smoking products commonly used in industry are shown in the following table:

Permeability, CORESTA units The main weight, g / m ² 24 25 33 25 46 25 60 26

For the purposes of this description, the base web of the preferred paper wrapper has a permeability of at least about 20 CORESTA units. The paper wrapper preferably has a permeability of more than about 30 CORESTA units, such as conventional base webs having nominal permeabilities from about 33 to about 4 6 CORESTA units with a base weight of about 25 g / m ² . For some applications, the base web has a permeability of more than about 60 CORESTA units, or more than about 80 CORESTA units, or even higher permeability values.

For clarity, we note that when describing the dimensions in the embodiments given here, the “width” of the strip-like region extends in the longitudinal direction of the tobacco rod, while the size in the circumferential direction of the strip-like region is indicated as “transverse”, or “in the transverse direction”, or in the direction across the web.

For the purpose of description, the strip-like regions of the added material disclosed herein are applied to a paper wrapper to obtain an improved reduction in ignition ability, while obtaining less self-extinguishing. Ignition ability is determined according to ASTM E 2187-04 - Standard Method for Measuring Ignition Ability of Smoking Products, which is hereby incorporated by reference in its entirety. Ignition ability characterizes the likelihood that a smoking article, when placed on a substrate, will generate enough heat to maintain the static burning of the tobacco rod. Low ignition ability values are desirable since such values correspond to a reduced likelihood that a smoldering smoking article will cause the substrate to ignite.

Self-extinguishing characterizes the cessation of smoldering of a smoking article in conditions of free combustion. To evaluate self-extinguishing, laboratory tests are carried out at a temperature of 23 ° C ± 3 ° C and a relative humidity of 55% ± 5%, which are controlled by a recording hygrothermograph. In a fume hood (s), the products of combustion formed during the test are removed. Prior to the test, the tested smoking articles were held at a relative humidity of 55% ± 5% and a temperature of 23 ° C ± 3 ° C for 24 hours. Immediately prior to the test, smoking articles were placed in glass beakers with free air access.

The self-extinguishing test is carried out in a chamber or test box. For ignition of smoking products intended for testing, a single-hole smoking machine or an electric lighter is used. During the test, the device or “corner holder” holds the test smoking articles by holding their ends at 0 ° (horizontal), 45 ° and / or 90 ° (vertical) angles. Twenty (20) smoking articles are tested in each of the 0 °, 45 °, and 90 ° positions. If more than one device is used, these devices are preferably positioned so that the smoking articles are facing away from each other to avoid mutual interference. If the smoking article goes out before the front line of the smoldering coal reaches the mouthpiece paper, this result is marked as “self-extinguishing”; on the other hand, if the smoking article continues to smolder until the front line of the smoldering charcoal reaches the piece of paper, then this result is noted as “no self-extinguishing”. Thus, for example, 95% self-extinguishing indicates that 95% of the tested smoking articles showed self-extinguishing under free-burning conditions, while 20% self-extinguishing showed that only 20% of the smoking products tested extinguished under free-burning conditions.

Self-extinguishing can be expressed as "self-extinguishing values at 0 °", "self-extinguishing values at 45 °" or "self-extinguishing values at 90 °", each of which refers to self-extinguishing at a certain angle of orientation of the cigarette. In addition, self-extinguishing can be expressed as the “average self-extinguishing value”, which means the average value in three angular positions, namely, the average value from (1) “self-extinguishing value at 0 °”, (II) “self-extinguishing value at 45 ° "And (III) self-extinguishing values at 90 °." The reference to the “self-extinguishing value” does not distinguish between self-extinguishing at 0 °, 45 °, 90 ° or the average value of self-extinguishing and can refer to any of them.

As used herein, “self-extinguishing under free-burning conditions” means stopping cigarette decay in the absence of puff when such a cigarette is in free-burning conditions.

As used herein, the term “serrated” means a pattern in the form of a plurality of equally spaced geometric recesses in a continuous (continuous) strip-like region. Jagged patterns or stripes can be described as jagged or wavy. As used herein, the term “grooves” refers to gaps or depressions in the serrated edge, while the term “serrations” refers to the protruding portions or teeth of the serrated edge between the grooves.

As used herein, the term “leading edge” refers to the edge of a strip-like region that is closest to the approaching charcoal during smoldering of a smoking article whose wrapper comprises a strip-like region, while the term “leading edge” refers to the edge of a strip-like region that is remote from the approaching coal during smoldering of a smoking article, the wrapper of which contains a strip-like region.

The wrapper of the smoking article comprises a main web 10 (see FIG. 2) having a nominal permeability and a plurality of strip-like regions 12 with a sufficient amount of added material, so that the wrapper has a permeability in the strip-like region less than the nominal permeability and the main web. The leading edge 14 of each strip-like region 12 is serrated. The trailing edge 16 of the strip region can also be serrated as desired.

Although a person skilled in the art will understand the various embodiments of the toothed areas, only a few embodiments are shown in the accompanying drawings. For example (see FIG. 2), the strip-like region 12 may have a leading edge 14 in which recesses 20 are located between the teeth 18. In this embodiment, the teeth 18 have a transverse dimension of the main web 10, which is essentially the same as recesses 20. As shown, the teeth 18 and the corresponding recesses 20 may be substantially rectangular. If desired, however, it is possible to have teeth 18 and recesses 20 with other geometric shapes, including, without limitation, quadrangles, trapezoids, triangles, hexagons, and other regular or irregular geometric shapes. The distance between the top of the tooth 18 and the bottom of the adjacent recess 20 can be from about 2 mm to about 5 mm, and preferably about 3 mm.

The trailing edge of the strip-like region 12 also has a similar toothed configuration. To this end, a plurality of teeth 22 can be laterally spaced across the main web 10 and separated from each other by a plurality of recesses 24. As shown, the front edge teeth 18 are laterally aligned with the recesses 24 and the leading edge recesses 20 are laterally aligned with the recesses 22 trailing edges. The recesses 24 have a dimension across the web substantially the same as a size across the web of teeth 18 at the front edge 14 of the strip. Similarly, the teeth 22 of the rear edge 16 may have a dimension across the web substantially the same as the size across the web of the grooves 20 of the front edge 14. The distance between the top of the tooth 22 and the bottom of the adjacent groove 24 at the rear edge of the strip can also be from about 2 mm to about 5 mm, preferably about 3 mm. Like the teeth 18 and the recesses 20 of the leading edge 14, the teeth 22 and the recesses 24 of the trailing edge can be substantially rectangular, substantially quadrangular, substantially trapezoidal, substantially triangular, substantially hexagonal or in the form of other geometric shapes.

The bottom of the notches 20 of the leading edge is preferably located from the bottom of the notches 24 of the rear edge at a distance x of from about 2 mm to about 5 mm and preferably from about 3 mm to about 4 mm. In this embodiment, a substantially continuous strip of width x is laterally extended across the main web 10. The bottom of the grooves 20 of the leading edge corresponds to the leading edge of the substantially continuous strip, while the bottom of the grooves 24 of the leading edge corresponds to the trailing edge of the substantially continuous strip.

The adjacent strip-like regions 12 of the paper web 10 are longitudinally spaced apart from each other by a distance that can range from about 10 to about 30 mm. Although the depth of the grooves 20 at the leading edge of the strip-like region 12 and the depth of the grooves 24 at the leading edge of the strip-like region 12 are shown in Fig. 2 as the same, in the scope of the utility model formula these depths can be made different if desired.

The dimensions of the teeth 18, 22 and the recesses 20, 24 in the transverse direction can be essentially the same, as shown in Fig.2. However, the total number of pairs of teeth 18 and recesses 20 preferably has a dimension across the web corresponding to the nominal circumference of the smoking article. For example, two groups of teeth 18 and recesses 20 may have dimensions across the sheet of about 6.2 mm, so that two pairs of each have a total size across the sheet of about 24.8 mm, which corresponds to the nominal circumference of the smoking article. If such dimensions are chosen for the teeth and recesses, then in the case when the main fabric 10 is longitudinally cut, for example, along lines 30, 32 to form bobbins of paper wrappers for smoking articles, the serrated pattern of the strip-like region 12 will essentially perfectly overlap into longitudinal seam forming a tobacco rod.

Refer to FIG. 3, in which the proportions of the teeth 44 and the recesses 46 of the front edge 40 differ from the embodiment of FIG. 2. In Fig. 3, the teeth 44 may have a dimension across the web equal to about half the size across the web at the mating recess 46. However, the total number of pairs of teeth 44 and the recesses 46 corresponds to the nominal circumference of the smoking article, as discussed above. The height of the teeth 44 or the depth of the recesses 46 is preferably within the values discussed in connection with FIG. 2.

In other words, when creating a printed pattern for a roll of paper with a serrated pattern, this pattern should be repeated across the roll according to the transverse size equal to the nominal circumference of the cigarette that the pattern should bear, even if the roll can be cut with a slightly larger size than the nominal circumference of the cigarette ( to provide an overlap for the seam along the tobacco rod). This practice will ensure the creation of the intended pattern on the cigarette, regardless of where the cutting starts, or the size of the seam. For example, if a cigarette should have a strip with eight (8) teeth and recesses and if the cigarette should have a nominal circumference of 24.8 mm, then a roll of notched paper would be cut every 27 mm, and a pattern (8) would be repeated with teeth every 24.8 mm

In the trailing edge of the embodiment of FIG. 3, the dimensions across the web at the teeth of the trailing edge 50 and the recesses 48 of the trailing edge are different from those across the web at the teeth of the leading edge 44 and the grooves of the leading edge 46. However, here the total number of groups of teeth 50 and recesses 48 has a dimension across the web corresponding to the nominal circumference of the smoking article. As shown, the size across the web at the recesses 48 is significantly smaller than the size across the web at the teeth 44 on the opposite side of the front edge 40. In addition, the depth of the grooves 48 or the height of the teeth 50 is within the dimensions discussed above in connection with FIG. Moreover, the distance between the bottom of the recesses 46 at the leading edge and the bottom of the recesses 48 at the trailing edge is also within the dimensions discussed above in connection with FIG. The distance between adjacent strip-like regions 12 in FIG. 3 is also within the range discussed above in connection with FIG. 2.

Referring to FIG. 4, in which the leading edge 14 of the strip region 12 may have substantially the same characteristics as those discussed above in connection with FIG. 2. However, the trailing edge 64 may have teeth 60 having dimensions across the web significantly larger than the dimensions across the web at opposite front edge depressions 20, while the dimensions across the web of the recesses 62 of the trailing edge are significantly smaller than the dimensions across the web of the corresponding opposing teeth 18 of the front edge 14 The distance between the serrated front and rear edges in Fig. 4 and the longitudinal distance between adjacent strip-like regions 12 in Fig. 4 are essentially the same as those described in connection with Fig. 2.

The teeth of the leading edge may have a transverse dimension of from about 3 mm to about 7 mm. For example, the teeth of the leading edge may have a transverse dimension of about 3.1 mm, about 4.2 mm, or about 6.2 mm. The notches of the leading edge may have a transverse dimension of from about 3 mm to about 7 mm. For example, the notches of the leading edge may have a transverse dimension of about 3.1 mm, about 4.2 mm, about 5.2 mm, or about 6.2 mm. The teeth of the trailing edge may have a transverse dimension of from about 6 mm to about 10 mm. For example, the teeth of the trailing edge may have a transverse dimension of about 5.775 mm, about 6.2 mm, or about 6.775 mm. The recesses of the trailing edge may have a transverse dimension of from about 1 mm to about 7 mm. For example, the recesses of the trailing edge may have a transverse dimension of about 1 mm, about 2.1 mm, or about 6.2 mm.

The smoking article may comprise a tobacco rod and a wrapper as described herein. The wrapper preferably has a dimension in the transverse direction that takes into account the circumference of the tobacco rod and the lap seam. As a result of this, regardless of where the wrapper is cut, the precise overlap of the serrated pattern is always ensured when molding the smoking article. In other words, the dimensions of the teeth and recesses of the toothed strip-like region in the transverse direction are determined so that on the smoking article the front edge of the strip-like region preferably contains at least two recesses and at least two teeth. For example, the leading edge of the strip-like region may comprise two notches and two teeth, three notches and three teeth, or four notches and four teeth. Thus, regardless of how the smoking article is placed on the substrate during the ASTM test, there is always symmetry in the strip-like region. Not wanting to be bound by theory, the authors believe that when a smoking article lies on a substrate during smoldering, combustion is modulated by a serrated front edge; specifically, the teeth of the leading edge reduce the progress of smoldering, while the notches of the leading edge allow a limited amount of smoldering to continue under free-burning conditions. Thus, the desired characteristics of self-extinguishing and igniting ability are achieved.

As is now understood, the strip-like regions with added material make it possible to create a smoking article with a useful combination of low ignition ability and low self-extinguishing values. Striped regions with added material having low permeability provide portions with a film-forming substance along the length of the tobacco rod that can interact with the substrate to quench the lit smoking article when placed on the substrate; however, these film-forming regions do not self-extinguish the smoking article when the smoker holds the smoking article in a free-burning state. Thus, the smoking article may exhibit a reduced ignition ability, while maintaining the desired free-burning quality or low self-extinguishing value due to the application of strip-like regions with a film-forming substance on the main fabric according to this description. The added material may be applied to one or both sides of the main web.

To achieve the desired characteristics of the smoking article in terms of ignition ability and self-extinguishing, strip-like regions are applied to the main web of the paper wrapper. It is preferable to create paper wrappers which, when used to wrap the tobacco rod, give it an ignition value of not more than 25 and a self-extinguishing value of not more than 50. An even more preferred value of the ignition ability for the resulting smoking article is not more than about 15, and the most preferred the ignitability value for the resulting smoking article is not more than about 10. Lower self-extinguishing values are also desirable. In this regard, a more preferred self-extinguishing value is less than about 25, and a most preferred self-extinguishing value is less than about 10.

The transverse dimensions of the paper wrapper are selected based on the diameter of the finished smoking article and the lap material in the longitudinal seam from about 1 mm to about 2 mm. For example, with lap seams of 1 mm, the size of the paper wrapper in the transverse direction may be about 27 mm for a smoking article having a circumference of about 25.6 mm.

Striped regions can be formed by applying one or more layers of an aqueous film-forming composition to the base web of the paper wrapper in order to reduce the permeability of the paper in the strip-like regions. Alternatively, cellulosic material can also be used to form strip-like regions. In cases where a film-forming composition is used, it may preferably include water and a high concentration blocking agent, for example, from 20 wt.% To about 50 wt.%. The film-forming substance may include one or more blocking agents, such as starch, alginate, cellulose or resin, and may also include calcium carbonate as a filler. In cases where the film-forming substance is starch, a concentration of about 24% may be useful.

The film-forming composition can be applied to the main web of paper wrapper 24 using intaglio printing, digital printing, coating or spraying using a stencil or any other suitable method. For example, film-forming substances and methods for applying them, described in US Published Application No. 2007/0102017 A1, which is incorporated herein by reference in its entirety, can be selected to apply strip-like regions to the main web of the paper wrapper. If desired, the strip-like regions with added material can be formed by printing multiple, consecutive layers, for example, two or more consecutive layers, aligned or aligned with each other. In addition, in cases where layers are used to form strip-like regions with added material, the material in the layers may be the same or different. For example, one layer may be of starch, while the next layer may be of starch and calcium carbonate.

In addition, the self-extinguishing ability of a smoking article may depend more on ensuring the minimum longitudinal extent of the film-forming substance than on the specific weight of the film-forming substance per unit area. The amount of film-forming substance used can be increased without loss of free-burning quality if a combustion accelerator is applied to the paper. Striped areas with added material reduce the permeability of the paper wrapper, preferably to a level of from about 0 to about 10 CORESTA units.

The multi-stage printing apparatus described herein typically includes a roll, a first gravure printing section, a second intaglio printing section, a third gravure printing section, a reeling roll, rollers, a printing cylinder, backup rollers, scrapers, a reservoir, a pump, a heat exchanger, an applicator, a bath , collector, drain, doctor blade, adjusting cylinders and idler.

As an alternative to gravure printing, strip-like areas or strips can be applied to the main web using the same cellulosic material that forms the main web. Striped regions may contain a suspension of highly purified fibrous cellulose (e.g., fibers, fibrils, microfibrils, or combinations thereof) or other added material applied using spraying or coating methods, including application methods that use a movable nozzle applicator in the forming part of a paper machine , described in US patent 5997691 and 6596125 (applicant), the contents of which are incorporated herein fully by reference. Although this technology has been used in the past to form strip-like circumferential regions by adjusting the relative motion between the paper web and the moving strip nozzle of the equipment described in U.S. Patents 5,997,691 and 6,596,125 (applicant), strip-like regions can also be easily formed using it. It is clear that such a system controls a device with a moving nozzle at a lower belt speed, which contributes to the application of wider bands and higher doses of application.

The terms and phrases used herein should not be construed with mathematical or geometric accuracy; rather, geometrical terminology should be interpreted as a meaning almost corresponding or similar to geometrical terms and concepts. Terms, such as “essentially”, are intended to encompass the exact meanings of the respective terms and concepts and also provide sufficient breadth that is consistent with form, function and / or meaning. The term “about” when used in connection with numerical quantities is intended to include values within a 10% tolerance of the indicated values.

Although various embodiments have been described above, various modifications, changes, and equivalents will be apparent to those skilled in the art. Such modifications, changes and equivalents should be considered to be within the scope of the attached utility model formula.

Claims (8)

1. A paper wrapper for a smoking article, comprising: main sheet permeable to air; and a strip-like region of added material that reduces the permeability of the wrapper in the strip-like region, moreover, the strip-like region includes a substantially continuous strip with a width of about 4 mm or less, wherein the front edge of the strip-like region is serrated, the rear edge of the strip-like region is serrated, and the teeth of the front edge are laterally aligned with the recesses of the rear edge, and the notches of the front edge are laterally aligned with the teeth of the rear edge. 2. The wrapper according to claim 1, in which the teeth of the leading edge have the same transverse dimensions as the notches of the rear edge, and the notches of the leading edge have the same lateral dimensions as the teeth of the rear edge. 3. The wrapper according to claim 1 or 2, in which, in the specified strip-like region, the distance between the tops of the teeth of the front edge and the specified essentially continuous strip is about 4 mm or less. 4. The wrapper according to claim 1 or 2, in which, in the specified strip-like region, the distance between the tops of the teeth of the front edge and the essentially continuous strip is about 4 mm or less, and the bottom of the notches of the front edge corresponds to the front edge of the specified essentially continuous strips. 5. The wrapper according to claim 1 or 2, in which the notch of the leading edge and the teeth of the leading edge have transverse dimensions, which are essentially the same. 6. A smoking article comprising a tobacco rod and a paper wrapper according to any one of claims 1 to 5. 7. A smoking article according to claim 6, in which the wrapper has a length in the transverse direction, which takes into account the circumference of the tobacco rod. 8. The smoking article according to claim 6 or 7, wherein the leading edge comprises at least two recesses and at least two teeth.

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