TWI454224B - Crenellated banded cigarette paper - Google Patents

Description

Cigarette paper with a toothed belt

The present invention relates to cigarette paper, and more particularly to cigarette paper having a toothed belt.

There has always been an attempt to design a smoking article that would be accidentally left on a substrate, and the tendency to do so is referred to as a "low ignition tendency". Ideally, smoke products with a low tendency to ignite will continue to burn when placed on a free standing, such as a cigarette holder placed in an ashtray or held in the hand without smoking ("free burning"). The tendency of cigarettes to extinguish during free combustion is referred to herein as "self-extinguishing." Many conventional cigarette designs that achieve low ignition tendency characteristics exhibit a high self-extinguishing rate in a free-burning state.

Here, a cigarette paper for smoking articles, comprising: a bottom sheet having a rated air permeability; and a belt region containing a sufficient additive material, the cigarette paper having a lower air permeability at a lower air permeability than the bottom sheet in the belt region . As seen by the advancing soot, the leading edge of the belt region is dentured.

According to the present description, a smoking article 1 comprises a cigarette branch 2. The cigarette 2 may comprise a cut tobacco filler 3 and is surrounded by the cigarette paper 10. One end of the smoking article may contain a suitable filter 4 that is surrounded by a suitable filter paper. The smoking article 1 typically has a generally circular cross section in length of the smoking article. However, other cross-sectional shapes including, for example, elliptical shapes are within the scope of the present description. The cigarette 2 has a nominal length measured from the filter paper to the free end of the cigarette along the longitudinal axis of the smoking article. For example, the nominal length can range from about 60 mm to about 100 mm.

Cigarette paper 10 comprises a bottom sheet that is typically breathable. The air permeability of cigarette paper is usually expressed in units of the Coresta (Cooperation Center for Scientific Research Relative to Tobacco Research Center). Coresta units per unit, a pressure drop (i.e., water column cm) per the unit area (i.e., cm ^2), volume flow rate (i.e., cm ³ / sec) was measured air permeability of the paper. Conventional cigarette papers also have a well-known basis weight, which is measured in grams per square meter referred to as "gsm" for short. The air permeability and basic weight of the bottom sheet of typical smoking paper commonly used in the industry are set in the following table:

For purposes of illustration, the bottom sheet of the preferred cigarette paper has an air permeability of at least about 20 Coresta units. The preferred consumer cigarette paper has an air permeability of greater than about 30 Coresta, such as a conventional base sheet having a nominal air permeability of about 33 and about 46 Coresta, and having a basis weight of about 25 gsm. For some applications, the backsheet may have an air permeability of greater than about 60 Coresta or greater than about 80 Coresta, and even higher breathability values.

For conventional reasons, it is to be understood that when the dimensions of the various embodiments are described herein, the "width" of the belt region extends in the longitudinal direction of the tobacco branch, and the circumferential dimension of the belt region is indicated as "lateral" or "crossing the sheet direction". "The direction of crossing."

For the purposes of this description, the application of the zone of added materials described herein is applied. To achieve improved ignition tendency ("IP") characteristics in cigarette paper, self-extinguishing ("SE") characteristics were also obtained. The ignition tendency is a standard test as described in ASTM E 2187-04 "Standard Test Method for Measuring the Ignition Power of Tobacco Products", the entire disclosure of which is incorporated herein by reference. Ignition Determination When placed on a platform, the smoking product generates enough heat to maintain the possibility of static burning of the cigarette. The low IP value is preferred because the value is related to the reduction in the likelihood of burning of the underlying platform caused by the smoked tobacco.

Here, self-extinguishing refers to the smoldering characteristics of the smoking article in a free-burning state. For the evaluation of SE, laboratory tests were carried out at 23 ° C ± 3 ° C and a relative humidity of 55% ± 5%, both of which should be monitored by a damp heat recorder. The hood removed the combustion products formed during the test. Before the test, the tobacco to be tested was adjusted for 24 hours under conditions of 55% ± 5% relative humidity and 23 ° C ± 3 ° C. Just before testing, place the smoking product in a glass beaker to ensure free air in and out.

The SE test takes place in a hood or in a test box. Use a single-port cigarette lighter or electric lighter to ignite the test article. During the test, a device or "angle holder" maintains the tested smoking article by maintaining one end at an angle of 0 (horizontal), 45 and/or 90 (vertical). Twenty cigarettes were tested at each of 0°, 45° and 90°. If more than one device is used, the device is preferably positioned such that the smoking products deviate from one another to avoid interfering interference. If the smoking article exits before the leading edge of the smoked soot reaches the filter paper, the result is recorded as "self-extinguishing". On the other hand, if the smoking article continues to be smoldered until the leading edge of the smoked soot reaches the filter paper As a result, the result is recorded as "not extinguished". Thus, for example, a 95% SE value means that 95% of the tested smoking products are presented in a free-burning state. The line is extinguished; the 20% SE value indicates that only 20% of the tested smoking products exhibit self-extinguishing in the free-burning state.

The SE value can be expressed as "self-extinguishing value at 0 degrees", "self-extinguishing value at 45 degrees", and "self-extinguishing value at 90 degrees", each of which represents the SE value of a specific test angle. In addition, the SE value can be expressed as "self-extinguishing average", which represents the average of the three angular positions: that is, (i) the average value of "self-extinguishing value at 0 degrees", (ii) "at 45 degrees" The average value of the self-extinguishing value and (iii) the average value of the self-extinguishing value at 90 degrees. "Self-extinguish" or "SE value" means SE that is not distinguished at 0 degrees, SE at 45 degrees, and SE or SE average at 90 degrees, and may refer to one of them.

As used herein, the phrase "self-extinguish in a free-burning state" or "self-extinguishing in a free-burning state" means the extinction of a non-smoky smouldering cigarette when the cigarette is subjected to or exposed to a free-burning state.

As used herein, the term "cartridge" refers to a pattern of geometric spaces that are multiplexed, regularly spaced, and removed from other physically continuous regions. The toothed pattern or band may also be referred to as serrated or similar to a pulse wave. As used herein, "mouth" refers to the opening or valley of a gingival margin, and "caries" refers to the elevation between the jaws, the ridges or the ridges.

As used herein, the term "leading edge" means the edge of the zone adjacent to the advancing soot during the smoldering of the tobacco containing the zone, and the term "trailing edge" means the zone containing the zone of cigarette paper. During smoking, the smoke is farthest from the edge of the belt where the ashes advance.

The cigarette paper for smoking includes a bottom sheet 10 (refer to Fig. 2) having a rated air permeability and a plurality of belt regions 12, which have sufficient belt regions 12 The material is added, and the cigarette paper has a lower air permeability than the bottom sheet in the belt region. The leading edge 14 of each belt region 12 is toothed. Alternatively, the trailing edge 16 of the belt region can also be toothed

Although a person skilled in the art can contemplate various configurations of caries regions, several such configurations are illustrated in the drawings. For example (see FIG. 2), the belt region 12 can have a leading edge 14 with the jaws 20 disposed between the molars 18. In this example, the size of the molars 18 in the lateral direction of the backsheet 10 is substantially equal to the transverse dimension of the jaws 20. As illustrated, the molars 18 and associated jaws 20 can generally be rectangular. However, if desired, the molars 18 and associated jaws 20 can have other geometric shapes without limitation, including quadrilateral, trapezoidal, triangular, pentagonal, and other regular or irregular geometric configurations. The distance between the top of the molars 18 and the bottom of the adjacent jaws 20 may range from about 2 mm to about 5 mm, preferably about 3 mm.

A similar tooth configuration can also be provided at the leading edge of the belt region 12. To this end, a plurality of molars 22 can be laterally spaced across the bottom sheet 10 and separated from each other by a corresponding plurality of jaws 24. As illustrated, the leading edge molars 18 are laterally aligned with the trailing edge of the jaws 24, and the leading edge of the jaws 20 are laterally aligned with the trailing edge of the molars 22. The cornice 24 has a transverse sheet size that is substantially the same as the cross-web size of the molars 18 at the leading edge 14 of the belt. Similarly, the serrations 33 of the trailing edge 16 can have a cross-web dimension that is substantially the same as the cross-web dimension of the rake 20 of the leading edge 14. The distance between the top of the molars 22 and the bottom of the adjacent jaws 24 may range from about 2 mm to about 5 mm, preferably about 3 mm. For example, the molars 18 and the tongue 20 of the leading edge 14 and the molars 22 and the mouth 24 of the trailing edge may be substantially rectangular, substantially quadrangular, substantially trapezoidal, substantially triangular, It is roughly pentagon and other regular or irregular geometric configurations.

Preferably, the bottom of the leading edge 20 is spaced from the bottom of the trailing edge 24 in the range of from about 2 mm to about 5 mm, preferably from about 3 mm to about 4 mm. With this configuration, a substantially continuous strip of width x extends transversely across the bottom sheet 10. The bottom of the leading edge of the mouth 20 corresponds to the substantially continuous leading edge, while the bottom of the trailing edge 24 corresponds to the substantially continuous trailing edge.

The adjacent strip regions 12 of the paper sheet 10 are longitudinally separated from one another by a nominal spacing. The nominal spacing can range from about 10 mm to about 30 mm. Although the depth of the mouth 20 on the leading edge of the belt region 12 and the depth of the mouth 24 on the trailing edge of the belt region 12 are the same as shown in Fig. 2, if desired, the depth can be made different, and this is still in the present Reveal the content within the scope.

The lateral dimensions of the molars 18, 22 and the jaws 20, 24 can be substantially the same as those shown in Figure 2. Preferably, however, the integer pair of molars 18 and the mouthpiece 20 have a traversing sheet size corresponding to the nominal circumference of a smoking article. For example, the two sets of molars 18 and the fistula 20 may have a cross-lamella size of about 6.2 mm, and the two pairs of each set have a cross-lamella size of about 24.8 mm, which corresponds to the nominal circumference of the smoking article. By virtue of the size of the jaws and the mouthpiece, when the bottom sheet 10 is split longitudinally to form a bobbin of cigarette paper for smoking, for example, on the lines 30, 32, the pattern of the teeth of the belt region 12 will substantially overlap perfectly. The longitudinal slits form a cigarette.

Turning to Figure 3, the ratio of the dent 44 and the nip 46 of the leading edge 40 is different than that shown in Figure 2. In Fig. 3, the molars 44 can have a traversing sheet size that is about one-half the size of the associated jaw 46 across the sheet. Of course However, as discussed above, the integer pair of molars 44 and the jaws 46 correspond to the nominal circumference of the smoking article. Preferably, the height of the molars 44 or the depth of the jaws 46 is within the range of values discussed in connection with FIG.

In other words, when the printing pattern for the toothed paper roll is established, even if the paper roll can be cut slightly larger than the nominal circumference of the cigarette (to provide the edge portion for the slit along the cigarette), the pattern itself should be according to the belt The pattern is equal to the transverse dimension of the nominal circumference of the cigarette, which is repeated across the paper roll. This practice ensures that no matter where the incision begins or the size of the slit, the pattern is created as desired on the cigarette. For example, if the cigarette is intended to have a pattern of eight molars and the cigarette is intended to have a nominal circumference of 248 mm, the toothed paper roll is cut every 27 mm, but the pattern of the eight molars is repeated every 24.8 mm.

At the trailing edge of the embodiment of Fig. 3, the cross-sheet dimensions of trailing edge gingival 50 and trailing edge nip 48 are different than the traversing of the leading edge dent 44 and the leading edge nip 46. However, again, the integer set of molars 50 and the mouth 48 have a cross-web size corresponding to the nominal circumference of the smoking article. As shown, the traversing sheet size of the cornice 48 is substantially smaller than the traversing sheet size of the upper teeth 44 on the opposite portion of the leading edge 40. Moreover, the depth of the jaws 48 or the height of the molars 50 is within the dimensions discussed above in connection with Figure 2. Moreover, the spacing between the bottom of the leading edge upper opening 46 and the bottom of the trailing edge upper opening 48 is also within the dimensions discussed above in connection with Figure 2. The spacing between adjacent strip regions 12 in Figure 3 is also within the dimensions discussed above in connection with Figure 2.

Turning now to Figure 4, the leading edge 14 of the belt region 12 can have substantially the same features as discussed above in connection with Figure 2. However, the trailing edge 64 can have a dent 60 that has a traverse that is substantially larger than the leading edge of the rim 20 The sheet size traverses the sheet size, and the trailing edge nip 62 has a traversing sheet size that is substantially smaller than the traversing sheet size of the corresponding opposing molars 18 of the leading edge 14. The spacing between the leading edge and trailing edge of the dentate shape in Fig. 4 and the spacing between adjacent strip regions 12 of Fig. 4 are substantially within the same range as discussed above in connection with Fig. 2.

Figure 5 shows yet another embodiment of a dent band region in accordance with the present disclosure. In this embodiment, the leading edge 14 can have features as discussed in conjunction with FIG. 2 or FIG. However, in the present embodiment, the trailing edge 70 of the dent band region 12 can be straight. The spacing between the bottom of the cornice 20 and the trailing edge 70 can be selected to be the same as the spacing between the serrated regions 20, 24 of Figure 2. Moreover, preferably, the adjacent belt regions 12 (Fig. 5) are spaced apart as illustrated in Fig. 2.

The leading edge molars can have a lateral dimension in the range of from about 3 mm to about 7 mm. For example, the leading edge molars can have a lateral dimension of about 3.1 mm, about 4.2 mm, or about 6.2 mm. The rake of the leading edge can have a lateral dimension in the range of from about 3 mm to about 7 mm. For example, the rake of the leading edge can have a lateral dimension of about 3.1 mm, about 4.2 mm, about 5.2 mm, or about 6.2 mm. The trailing edge molars can have a lateral dimension in the range of from about 6 mm to about 10 mm. For example, the trailing edge molars can have a lateral dimension of about 5.775 mm, about 6.2 mm, or about 6.775 mm. The trailing edge of the mouth can have a lateral dimension in the range of from about 1 mm to about 7 mm. For example, the trailing edge of the cornice can have a transverse dimension of about 1 mm, about 2.1 mm, or about 6.2 mm.

As described herein, smoking articles can include cigarettes and cigarette paper. Preferably, the cigarette paper has a transverse dimension that accounts for the circumference of the cigarette and the overlapping slits. As a result, regardless of whether the cigarette paper is cracked or not, when forming a cigarette, the tooth-shaped pattern is constant. There is a correct overlap. In other words, it is determined that the lateral dimension of the molars and the mouth of the dentate band region is on the smoking article. Preferably, the leading edge of the belt region comprises at least two jaws and at least two molars. For example, the leading edge of the belt region may include two jaws and two molars, three jaws and three or four jaws and four molars. Thus, regardless of how the smoking article is placed on the platform during the ASTM test, there is constant symmetry in the zone. Without wishing to be bound by this theory, when the smoke is placed on the platform during the smoldering, the burning will be regulated by the leading edge of the dentate shape; in particular, the molars of the leading edge reduce the advancement of smoldering, but During the free-burning state, the rim of the leading edge allows a limited amount of smoldering to continue. Therefore, it should be possible to achieve the desired SE and IP characteristics.

As is currently understood, in accordance with the present description, the zone of added material allows the smoking article to be designed to have a combination of low IP values and low SE values. The low vent zone of the added material provides a film forming composition region along the length of the smear that cooperates with the platform to extinguish the ignited smoking article when the ignited smoking article is placed on the platform, but only when the smoker is in a free burning state In the case of smoking articles, such film-forming composition regions do not cause the smoking articles to self-extinguish. Thus, in accordance with the present description, by applying a film forming composition region to the backsheet, the smoking article can exhibit a reduced tendency to ignite while maintaining desired free combustion properties or low SE values. The added material can be applied to one or both sides of the bottom sheet.

In order to achieve the IP and SE characteristics of the desired smoking article, the belt area is applied to the bottom sheet of the cigarette paper. One of the purposes of the present specification is to provide a cigarette paper that exhibits an IP value of no more than 25 and an SE value of no more than 50 when forming a cigarette. Even preferably, the finished product has an IP value of no greater than about 15; and the optimal smoking product has an IP value of no greater than about 10. It is also expected to have a lower SE value. In this respect, The preferred SE value is not less than about 25; and the optimum SE value is not less than about 10.

The transverse dimension of the cigarette paper is selected based on the diameter of the finished article (about 7 mm to about 10 mm) and allows the material to overlap the longitudinal seam of from about 1 mm to about 2 mm. For example, to allow for the overlap of slits of 1 mm, for cigarettes having a circumference of about 25.6 mm, the transverse dimension of the cigarette paper can be about 27 mm.

The belt region can be reduced in the air permeability of the paper in the belt region by coating one or more layers of the aqueous film-forming composition on the bottom sheet of the cigarette paper. Alternatively, a cellulosic material can also be used to form the belt region. In the case of using a film-forming composition, preferably, the film-forming composition may comprise water and a high concentration, for example from 20% to about 50% by weight of the absorbent. The film forming composition may comprise one or more occluding agents such as starch, alginate, cellulose or gum, and may also comprise calcium carbonate as a filler. In the case of starch-based film-forming compositions, a concentration of about 24% may be advantageous.

The film forming composition can be applied to the bottom sheet of the cigarette paper 10 using gravure printing, digital printing, coating or spraying using a stencil, or any other suitable technique. For example, a film forming composition disclosed in U.S. Patent Publication No. 2007/0102017 A1 and a method for coating a film-forming compound can be used to coat a belt region of a cigarette paper to a bottom sheet, the entire text of which is incorporated herein by reference. for reference. If desired, the strip regions of the added material can be formed into a plurality of continuous layers that are aligned or aligned with one another, such as two or more continuous layers. Moreover, when layers are used to form the ribbon regions of the additive material, the materials of the layers may be the same or different. For example, one layer may be starch and the second layer may be starch and calcium carbonate.

In addition, the ability to extinguish a smoking article may depend on the amount of minimum length provided. The film composition is more than the specific weight per unit area of the film-forming composition. If a combustion accelerator is applied to the paper, the amount of film forming composition used can be increased without losing the free combustion properties. Preferably, the zone of added material reduces the air permeability of the cigarette paper to a range of from about 0 to 10 Coresta.

The multi-step printing apparatus described herein typically includes a reel, a first gravure printing station, a second gravure printing station, a third gravure printing station, a collecting reel, a roller, an impression cylinder, a support roller, a pliers, a sump, a pump, Heat exchangers, applicators, tanks, collectors, drain holes, scrapers, adjustment rolls, and idler rolls.

As an alternative to the gravure printing operation, the strip region or tape can be applied to the backsheet using the same cellulosic material that forms the backsheet. The belt region may comprise highly refined cellulose (eg, fibers, fibrils, microfibrils, or combinations thereof) slurries or other additive materials that are coated using various spray or coating techniques, including as commonly co-owned US Patent US- The application of a moving orifice applicator to the forming section of a paper machine is described in A-5 997 691 and US-A-6 596, the entire disclosure of which is incorporated herein by reference. In the past, the technique has been used to form a circumferential direction by adjusting the relative movement between the strip of paper and the moving aperture of the apparatus described in commonly-owned U.S. Patent Nos. 5,997,691 and US-A-6,596,. With the belt area, the belt area of the present disclosure can be easily formed. It should be noted that this configuration facilitates the operation of the moving orifice device at a slower belt speed that is more broadband and has a higher application rate.

The terms and terms used herein must not be interpreted mathematically or geometrically, but geometric terms are interpreted as close to or similar to the meaning of geometric terms and concepts. Terms such as "roughly" are intended to cover related nouns and concepts. Exact meaning and provide a reasonable range consistent with form, function and/or meaning. The term "about" as used in relation to quantity is intended to include a value within 10% of the stated quantity.

Although various embodiments have been described, it will be understood that various modifications, changes and equivalents can be readily made by those skilled in the art. Such changes, changes and parity are considered to be within the scope and scope of the scope of the patent application.

1‧‧‧Smoking

2‧‧‧Smoke

3‧‧‧cut filler

4‧‧‧ filter

10‧‧‧ bottom sheet (cigarette paper)

12‧‧‧With area

14‧‧‧ Leading edge

16‧‧‧ trailing edge

18‧‧‧ teeth

20‧‧‧垛口

22‧‧‧ teeth

24‧‧‧垛口

30,32‧‧" line

40‧‧‧ leading edge

44‧‧‧ teeth

46‧‧‧ Front edge

48‧‧‧ trailing edge caries

50‧‧‧ trailing edge caries

60‧‧‧ teeth

62‧‧‧ trailing edge

70‧‧‧ trailing edge

BRIEF DESCRIPTION OF THE DRAWINGS The many objects and advantages of the present disclosure will be apparent to those skilled in the art in the <Desc/Clms Page number> Fig. 2 is a schematic view showing a cigarette paper having a toothed belt region according to a first embodiment; Fig. 3 is a schematic view showing a cigarette paper having a second embodiment of a toothed belt region; and Fig. 4 is a toothed belt region 3 is a schematic view of the cigarette paper of the embodiment; and 5th and 5th is a schematic view of the cigarette paper of the fourth embodiment having the toothed belt region.

1‧‧‧Smoking

2‧‧‧Smoke

3‧‧‧cut filler

4‧‧‧ filter

10‧‧‧ bottom sheet (cigarette paper)

12‧‧‧With area

Claims (8)

A cigarette paper for smoking articles, comprising: a bottom sheet having a rated air permeability; and a belt region containing a sufficient additive material, wherein the cigarette paper has a gas permeability lower than a rated air permeability of the bottom sheet Wherein the strip region comprises a substantially continuous strip having a width of less than 4 mm, wherein the leading and trailing edges of the strip region are dentured, and wherein the teeth of the leading edge are laterally aligned with the slits of the trailing edge, and The rakes of the leading edge are laterally aligned with the teeth of the trailing edge. The cigarette paper of claim 1, wherein the teeth of the leading edge have a transverse dimension equal to the tongues of the trailing edge, and the tongues of the leading edge have the same size as the teeth of the trailing edge Horizontal size. The cigarette paper of claim 1, wherein the distance between the top of the ridge of the leading edge and the substantially continuous strip is 4 mm or less. The cigarette paper of claim 1, wherein a distance between the top of the ridge of the leading edge and the substantially continuous belt is 4 mm or less, and a front edge of the rim of the leading edge and the substantially continuous belt correspond. The cigarette paper of claim 1, wherein the rim of the leading edge has substantially the same lateral dimension as the teeth of the leading edge. A smoking article comprising a cigarette and a cigarette paper as claimed in claim 1. The smoking article of claim 6, wherein the cigarette paper has a lateral length that is included in the circumference of the cigarette. For example, in the smoking article of claim 6, wherein the leading edge includes at least two defects. Mouth and at least two molars.