KR20100020958A - Patterned wapper paper with an anti-wrinkling agent - Google Patents

Abstract

Wrapper paper (23) for cigarette manufacture includes transversely extending band regions (26) applied by a printing technique, such as gravure printing. The band regions (26) comprise starch, an anti-wrinkling agent, and optionally calcium carbonate. The anti-wrinkling agent may be selected from the group consisting of 1,2 propylene glycol and glycerin.

Description

PATTERNED WAPPER PAPER WITH AN ANTI-WRINKLING AGENT}

This disclosure relates to banded paper wrappers for use in cigarette manufacture, incorporating smoking articles and, more specifically, anti-wrinkle agents.

To date, multilayered banded areas on cigarette paper wrappers have been used to perform local shrinkage relative to the nominal permeability of the base paper to meet the ignition propensity targets imposed by the various rights. The materials used in these multilayered banded regions were applied in various ratios, coating weights, and compositions to achieve the desired purpose. Many times, however, wrinkles occurred in the area between adjacent banded areas of the resulting paper wrapper.

summary

The smoking article comprises a tobacco rod having a paper wrapper formed from a base web having a nominal permeability. The compartment of the add-on material is preferably applied to the base web as if it extends laterally of the base web and is spaced from one another in the longitudinal direction of the base web. In addition to containing starch or a mixture of starch and calcium carbonate, each compartment preferably comprises an anti-wrinkle agent.

The addition of an anti-wrinkle agent to the compartment of the additional material on the paper wrapper obtains improvements including, but not limited to, smoking articles made of paper wrapper including: (1) maintaining satisfactory ignition propensity (IP) performance; While reducing free-burning self-extinguishing (SE); (2) enhanced flowability to the solution used to form the compartment of additional material; (3) improving the quality of the additional material compartment by the presence of an anti-wrinkle agent (ie, more flexibility, less wrinkles, etc.); (4) reduced penetration of additional material into the base web; (5) adaptability to high Coresta base papers; And / or (6) suitable for single-pass printing applications of additional materials.

Many objects and advantages of the present disclosure will be apparent to those skilled in the art upon reading the present specification in conjunction with the accompanying drawings in which the same reference numerals apply to the same elements, wherein:

1 is a schematic perspective view of a smoking article according to the present disclosure;

2 is a schematic view of a paper wrapper according to one embodiment of the present disclosure;

3 is a schematic view of a paper wrapper according to a second embodiment of the present disclosure;

4 is a schematic view of a paper wrapper according to a third embodiment of the present disclosure;

5 is a schematic view of a paper wrapper according to a fourth embodiment of the present disclosure;

6 is a schematic cross sectional view taken along line 6-6 of FIG. 2;

7 is a schematic cross-sectional view, similar to FIG. 6, of a multi-layered band structure; And

8 is a schematic diagram of an exemplary multiple stage printing apparatus.

Detailed description of the invention

In accordance with the present description, the smoking article 20 (see FIG. 1) may include a tobacco rod 22 formed from a paper wrapper 23. The tobacco rod 22 may be oval or another cross-sectional shape, but generally the paper wrapper 23 surrounds a large amount of tobacco 24 to make a circular cylindrical tobacco rod 22. One end 28 of the tobacco rod 22 is ignitable and is sometimes referred to as the "ignition end" for reference purposes. The second end 30 of the tobacco rod 22 is sometimes referred to as a "tipped end" or "oral end" for reference purposes. If desired, a filter 32 may be provided at the oral end 30 of the tobacco rod 22 to remove the measurement component from the tobacco smoke when smoking the smoking article 20. Typically, the filter 32 is attached to the tobacco rod 22 by tipping paper 32 surrounding the filter 32.

Between the first end 28 and the second end 30 of the tobacco rod 22, the paper wrapper 23 has at least one compartment or region 26 of additional material. The compartment 26 of additional material preferably extends in the circumferential direction at one or more spaced positions along the axis 34, which extends around the tobacco rod 22 of the smoking article 20. While the section 26 of additional material is described herein as substantially continuing in its circumferential direction, other arrangements of additional material are within the scope of this specification.

For the purposes of the present invention, the compartment 26 of the additional material may be formed of a paper wrapper to obtain satisfactory or improved ignition propensity (“IP”) characteristics and also to obtain improved self-extinguishing (“SE”) characteristics. Applies to 23).

Ignition propensity is a standard test performed as described in ASTM E2187-04, "Standard Test Method for Measuring the Ignition Strength of Smoking articles," which is hereby incorporated by reference in its entirety. The propensity to ignite measures the likelihood that when the smoking article is smoked and placed on the substrate, it will generate enough heat to maintain the smoke generation of the tobacco rod. Low IP values are desirable because these values are associated with a reduction in the likelihood of combustion occurring in the underlying substrate when a smoking smoking article is left unintentionally.

Self-extinguishing here relates to the smoking property of the smoking article under free-burn conditions. To enhance SE, laboratory tests are performed at a temperature of 23 ° C. ± 3 ° C. and a relative humidity of 55% ± 5%, both of which must be observed with a temperature and humidity recorder. The exhaust hood (s) removes the ignition product formed during the test. Before testing, the smoking article to be tested is adjusted to a relative humidity of 55% ± 5% and a temperature of 23 ° C ± 3 ° C for 24 hours. Immediately before the test, the smoking article is placed in a glass beaker for free air access.

SE testing is done in an enclosure or test box. A single port smoking device or electric lighter is used to ignite the smoking article for inspection. During the test, the device or “angle holder” maintains the end of the smoking article to be tested by holding the end at an angle of 0 ° (horizontal), 45 °, and / or 90 ° (vertical). Preferably the smoking article 20 is tested at 0 °, 45 °, and 90 ° positions respectively. When more than one device is used, the devices are positioned so that smoking articles face each other to avoid cross interference. If the smoking article is turned off before the forefront of smoky coal reaches tipping paper, the result is evaluated as "self-extinguishing"; On the other hand, if the smoking article continues to smoke until the forefront of the smoking charcoal reaches tipping paper, the result is evaluated as "non-digestible". Thus, for example, an SE value of 95% indicates that 95% of smoking articles tested under free-burning conditions were self-extinguishing; A SE value of 20% indicates that only 20% of the smoking articles tested were self-extinguishing under this free-burning condition.

The SE value may mean "self-extinguishing at 0 °", "self-extinguishing at 45 °", or "self-extinguishing at 90 °", each representing the value of SE at the listed test angles. In addition, the SE value can mean "self-extinguishing mean", which means the position and mean of three angles: (i) "self-extinguishing at 0 °", (ii) "45 ° value". Self-digestion ", and (iii)" self-digestion at 90 ° value ". The criteria for" self-digestion value "or" SE value "are SE of 0 °, SE of 45 °, SE of 90 °, or It can mean any one of these without being distinguished between SE mean values.

As used herein, the phrase "self-extinguish under free-combustion" or "self-extinguish under free-combustion" means the extinguishing capacity of a smoking cigarette without puffing, ie, free-combustion. do.

The compartment 26 of additional material determines and regulates the IP and SE properties of the smoking article 20. This section 26 of additional material is applied to the base web 40 of the paper wrapper 23 (see FIG. 2) and then formed into tobacco rods in conventional cigarette making equipment. The nominal permeability of the base web 40 may range from about 25 to about 100 Coresta. Currently, the preferred nominal permeability of the base web is in the range of about 33 to about 65 Coresta, and the nominal permeability of about 33 and about 60 is most preferred. The base web 40 has a longitudinal direction 42 extending along the length of the paper wrapper 23 and a transverse crosswise extending transversely across the width of the paper wrapper 23 to be generally perpendicular or transverse to the longitudinal direction 42. Has a direction 44.

This section 26 of additional material may be applied to the base web 40, preferably by printing techniques. One or more printing techniques (selected from the group consisting of direct printing, offset printing, inkjet printing, gravure printing, etc.) may be used to apply to the compartment 26, preferably a gravure printing process will be used. Gravure printing provides sufficient control of mounting speed, mounting pattern, and the like, and may be suitable for high-speed printing on the base web 40. For the purposes of this specification, "high speed" printing refers to printing processes in which the base web 40 proceeds through the printing process at a linear speed of about 300 feet / min or more. For cigarette production purposes, a basic web printing speed of at least 450 feet / min is preferred, and a speed of at least 500 feet / minute is even more preferred. In this regard, when comparing the paper wrapper produced by the high-speed printing process with the paper wrapper produced by the low-speed printing process, the mounting speed for the additional material, as well as the quality of the attached additional material pattern, is considerably It can vary. Faster high-speed print jobs can achieve both desirable IP values (performance) and desirable SE values (performance).

One object of the present specification is to provide a commercially-sized, high-speed produced paper wrapper 23 that, when formed from the tobacco rod 22, exhibits an IP value of 25% or less and an SE value of 50% or less. (See Figure 2). Thus, the mounting speed and characteristics of the resulting printed area are important features of high-speed printing. While these IP and SE values are considered to be sufficient, the IP values for the resulting smoking articles are even more preferably about 15% or less; And the most preferred IP value for the resulting smoking article is about 10% or less. Low SE values are also desirable. In this regard, more preferred SE values are less than about 25%; Most preferred SE values are less than about 10%.

The materials used in the compartment of the additional material may be important for the IP and SE performance of smoking articles made using the paper wrappers discussed herein. In one embodiment, the compartment of additional material may be printed with a starch solution comprising an anti-wrinkle agent. While the aqueous component is inevitably preferred because it dries immediately, the use of non-aqueous starch solutions is also within the scope of this specification. In another embodiment, the compartment of additional material may be printed with a solution comprising a mixture of calcium carbonate (or chalk) particles, starch, and an anti-wrinkle agent. As long as there is a starch and anti-wrinkle solution, a solution comprising a mixture of calcium carbonate (or choke) particles, starch, and anti-wrinkle agent is preferably applied as an aqueous solution, but non-aqueous solutions are also within the scope of this specification. have.

While many types of starch are contemplated, tapioca starch is currently preferred as a starch component. A suitable starch commercially available is FLO-MAX8 available from National Starch & Chemical Co.

Similarly, it is contemplated that various types of calcium carbonate particles are within the scope of this specification. Currently, however, calcium carbonate available from Solvay Chemicals, Inc. as SOCAL 31 is suitable as a commercially available calcium carbonate. SOCAL 31 is an ultrafine precipitated calcium carbonate with an average particle size of about 70 nm (nanometer). Larger particles of calcium carbonate have been observed to be poorly applied in this application when compared to ultrafine precipitated calcium carbonate, which at least partly has a larger tendency to precipitate out of solution, and at least in part discussed herein. Is due to the demand of better quality in order to obtain advantageous features.

It is contemplated that various anti-wrinkle agents are suitable for obtaining the desirable features described herein. In particular, the anti-wrinkle agent is selected from the group consisting of glycerin, propylene glycol, and 1,2 propylene glycol. Glycerin is a preferred member of the anti-wrinkle group. At present, however, 1,2 propylene glycol is the most preferred member of the anti-wrinkle group.

Generally speaking, the present specification contemplates adding (i) anti-wrinkle agents or (ii) combinations of anti-wrinkle agents and calcium carbonate to the nominal aqueous starch solution to obtain additional solutions to be used for printing. For the nominal aqueous starch solution used herein, the starch may be included from about 10% to about 28% by weight of the nominal solution. Preferably, the starch may be included in about 20% to about 24% by weight of the nominal solution. Most preferably, starch may be included in about 22% by weight of the nominal solution.

The anti-wrinkle agent is preferably added to the nominal starch solution such that the weight of the anti-wrinkle agent ranges from about 10% to about 120% by weight of starch in the nominal starch solution. When the anti-wrinkle agent is 1,2 propylene glycol, the weight of the anti-wrinkle agent is more preferably in the range of about 50% to about 120% by weight of starch in the nominal starch solution; Even more preferred is in the range of about 60% to about 110% by weight; And about 90% to about 110% by weight is most preferred. When the anti-wrinkle agent is glycerin, the weight of the anti-wrinkle agent is more preferably in the range of about 10% to about 45% by weight of starch in the nominal starch solution; Even more preferred in the range of about 20% to about 40% by weight; And about 20% to about 30% are most preferred. When glycerin is used as an anti-wrinkle agent from about 40% to about 45%, glycerin has a side effect on the dry quality of the addition solution.

If calcium carbonate or choke is added to the nominal starch solution in addition to the anti-wrinkle agent, the weight of the choke may range from 0% to about 100% by weight of starch in the nominal solution; A range from about 40% to about 100% by weight is preferred; And from about 60% to less than about 80% by weight is most preferred. Choke may be added to the nominal starch solution to adjust the reflectance of the resulting additive material to be similar to that of the uncoated base web material. By this reflectance, banded regions made of additional materials may be less noticeable to the general observer.

When produced with high-speed printing, the CaCO ₃ -to-starch ratio can also be an important factor in determining the IP and SE performance of smoking articles made from paper wrappers herein. The CaCO ₃ -to-starch ratio is determined as the weight ratio of calcium carbonate to starch relative to the compartment of the additive material. More specifically, a CaCO ₃ -to-starch ratio of less than about 0.8 is desirable to obtain an IP and SE (at 0 °) performance of less than about 25%.

From the following description and the annexed drawings, those skilled in the art will understand that methods of making banded paper wrappers for smoking articles have been described. In this way, the banded region 26 (see FIG. 2) of the additional material is provided at intervals on one surface of the base web 23. The spacing of these banded regions 26 may be selected to be substantially greater than the width of the banded regions 26 in the longitudinal direction 42 of the base web 40. The width of the banded region 26 may be selected in the range of about 5 mm to about 10 mm (millimeters); And the spacing between these banded regions 26 (measured as the distance from the trailing edge of one banded region to the leading edge of the next adjacent banded region) from about 12 mm to about 12 mm. It may range from about 40 mm.

The base web 40 with the band area 26 can be fed in a roll, the base web 40 being split into its part having a transverse width corresponding to the circumference of the tobacco rod plus the width of the adhesive seam in its longitudinal direction. Can be. After breaking the web into individual portions, each of these portions can be wound around a corresponding bobbin. Using conventional equipment, such as a cigarette making machine, the base web 40 is fed from the bobbin to the machine where the cut tobacco filler is applied paper so that the banded area 26 is over the interior of the produced tobacco rod 22. It is mounted along the side of the web 40. Also in a conventional manner, the paper wrapper wraps around the cut tobacco filler and is sealed with longitudinal seams to form the tobacco rod 22 (see FIG. 1).

Thus, the method of making the banded paper includes passing the base web to the print station while supplying additional solution at the print station and repeatedly applying the solution to a portion of the base web at the print station.

Fig. 8 is a schematic diagram of a multi-stage printing apparatus. 8 shows a reel 41 of paper, a first gravure printing station 43, a second gravure printing station 45, a third gravure printing station 46, a collection reel 48, a roller 50, a pressurized cylinder 52, back roller 54, nip 56, reservoir 58, pump 60, heat exchanger 62, applicator 64, bathtub 66, collector 67, The drainage apparatus 68, the doctor blade 70, the adjustment cylinder 72, and the idle roller 74 are illustrated. In FIG. 8, the features of the first gravure printing station 43 include reference numerals with the suffix "a", and the corresponding features of the second gravure printing station 45 refer to the same reference numerals with the suffix "b". And the corresponding feature of the third gravure printing station 46 comprises the same reference numeral with the suffix "c". When a section of additional material is applied in a single pass, only one print station is required. However, other print stations can be used to apply indexes or reference marks, logos, and the like.

A typical reservoir 58 includes a mixture of additional materials forming areas banded to the wrapper described above. The reservoir 58 is in communication with a suitable pump 60 capable of handling the viscous additive material. The additional material will then flow to a suitable heat exchanger 62, where the temperature of the additional material is raised such that the viscosity of the additional material is adjusted to a level suitable for printing. The viscosity of the additional material may increase over time (eg after remaining in the reservoir) to a level where the viscosity of the additional material is no longer suitable for printing. Because of its dynamics, the additive material has a finite shelf life, or availability-period, after which the material loses its usefulness as a material. However, addition of the anti-wrinkle agent to the additive material formulation: (1) reducing the initial viscosity of the additional material compared to the material without the anti-wrinkle agent; And (2) the shelf life or pot life of the additive material is increased.

The following example, non-limiting examples are provided for further explanation. The results provided in Tables I and II compare the initial viscosity and time stability of the printing solution without the anti-wrinkle additive with the initial viscosity and time stability of the printing solution with the anti-wrinkle additive. The results reported in Table I (for 1,2 propylene glycol) and Table II (for glycerin) indicate that printing solutions containing anti-wrinkle agents such as 1,2 propylene glycol or glycerin are initially less viscous and much longer. It has a lower viscosity over time and is more stable.

Table I

¹ CaCO ₃ was added to an aqueous solution of 24% dry starch; The weight ratio of added CaCO ₃ to dry starch in solution is 0.8: 1.0.

² CaCO ₃ was added to an aqueous solution of 24% dry starch; The weight ratio of 1,2 1,2 propylene glycol added to CaCO ₃ added to dry starch in solution is 1.0: 0.8: 1.0.

Table II

¹ CaCO ₃ was added to an aqueous solution of 20% dry starch; The weight ratio of added CaCO ₃ to dry starch in solution is 1: 1.

² CaCO ₃ and glycerin were added to an aqueous solution of 20% dry starch; The weight ratio of added glycerin to added CaCO ₃ to dry starch in solution is 1: 5: 5.

The tables measure the viscosity thereof, demonstrating that the useful shelf life of the printing solution with the antiwrinkle agent is essentially double the shelf life of the printing solution without the antiwrinkle agent. The addition of anti-wrinkle agent to the material applied to the additional compartment thus enhances the fluidity of the printing solution used to form the compartment of the additional material.

When the additional material is applied by printing technique, the viscosity of the applied material is important. It has a finite shelf life or shelf life, in which the viscosity of the applied material increases over time, after which the material loses its usefulness. As demonstrated in Table 1, by adding an anti-wrinkle agent in the applied material form, the initial viscosity of the additional material can be reduced by about 20%. Moreover, the shelf life, or shelf life, of the additional material is increased by at least two factors compared to the material without the antiwrinkle agent.

The results provided in Tables III and IV show that the addition of an anti-wrinkle agent to the printing solution reduces the free-burning SE without the effect of IP, ie, maintaining acceptable IP levels. For the information in Table III, batches of 20 cigarettes were tested at each location to achieve SE performance, while batches of 40 cigarettes were tested to obtain IP performance.

TABLE III

22% starch + 100% 1,2 propylene glycol ^One  + CaCO ₃ Printing solution

¹ 1,2 propylene glycol is added to an aqueous solution of 22% dry starch; 1,2 propylene glycol is added to the starch solution in which the ratio of 1,2 propylene glycol to dry starch is 1.0: 1.0; CaCO ₃ was then added to the starch solution at the indicated weight percent and the relative weight to the dry starch used in the solution was measured.

From Table III, some conclusions can be drawn. For example, IP is well within the 25% target for 7mm sections or bands. In addition, IP is well within the 25% target when the CaCO ₃ weight is less than 80% of the starch weight. In addition, the average SE value was 70% or less when the CaCO ₃ weight exceeded 40% of the starch weight; And SE at 0 ° was less than 25% when CaCO ₃ weight exceeded 40% of starch weight.

For the information in Table IV, smaller groups of cigarettes, namely five groups, were tested. Cigarettes tested for results in Table IV were made in two hand-brushed bands using additive material solutions as shown in Table IV.

Table IV

¹ glycerin was added to an aqueous solution of 20% dry starch; The weight ratio of added glycerin to dry starch in solution is 1: 5.

For both solutions containing anti-wrinkle agents, in the IP test all cigarettes were self-extinguishing before the char reached the filter line. However, in the SE test (at 0 °), for solutions without anti-wrinkle agents, 60% of cigarettes were self-extinguishing before reaching the filter line, whereas for solutions containing anti-wrinkle agents, only 20% of cigarettes Was self-extinguishing before reaching the filter line. Therefore, self-extinguishing is usually lower than the target 25%. Ignition propensity performance was good and the value of 0% was often lower than the target value of 10%, 15%, or 25% used. Thus, the addition or incorporation of an anti-wrinkle agent in the compartment of the additional material reduces free-burning self-extinguishing (SE) without adversely affecting the ignition propensity (IP) performance.

Incorporation of the antiwrinkle agent in the additional material also improves the properties of the resulting banded paper wrapper. More specifically, anti-wrinkle agents have been found to increase the flexibility of additional materials when dried in paper wrappers (ie, they act as plasticizers). As a result, the band of additive material is different than the band of paper wrapper where no anti-wrinkle agent is used in the formulation and tends to be less separated from the base web during use. Moreover, as noted above, the incorporation of the anti-wrinkle agent in the additive material results in enhancement of SE performance without degradation of IP performance in smoking articles processed into paper wrappers having bands of additional material comprising the anti-wrinkle agent.

Although the action of antiwrinkle agents in starch solutions is not fully understood, antiwrinkle agents also appear to function as plasticizers in starch solutions. Starch solutions without anti-wrinkle agents that can also function as plasticizers tend to penetrate the upper surface of the paper structure. Moreover, starch solutions tend to shrink or shrink when it dries. The reduction and / or shrinkage also causes the underlying web, i.e., the portion below the band region, to shrink or shrink. As an example, the width of a 91 cm (36 inch) wide paper web can shrink (up to about 1 to about 2%) by about 1.3 cm to about 1.9 cm (about 0.5 inch to about 0.75 inch) in the band area. Was observed. Such shrinkage can cause difficulties, among other things, in maintaining proper print registration between multiple print stations when using multipass printing.

Since the underlying web between banded areas does not shrink, a wave appears between the banded areas, where the wave extends in the longitudinal direction of the underlying web and the undulation of the wave is the cross-web or horizontal of the underlying web. Occurs in the direction. The underlying web is broken up into sorted longitudinal sections to produce a cigarette, and each of these vertical sections of the paper web is tightly wound on a corresponding bobbin. Thus, the above mentioned relief sometimes causes the paper to fold itself to fit the width reduction caused by shrinking in the band area, resulting in wrinkles in the unbanded area. In paper wraps these folds are generally not allowed for tobacco rod production.

Therefore, shrinkage of the band region appears to cause wrinkles in the unbanded or unprinted area of the paper wrapper. In addition, although the mechanism is not fully understood, the addition of an anti-wrinkle agent to the starch solution appears to make the printed layer or banded section more flexible. This flexibility makes the printed starch layer more elastic. Flexibility also allows the printed layer to have a reduced penetration into the surface of the paper web so that the printed layer stays more and more on the surface of the paper web. Regardless of whether this mechanism, a combination of mechanisms, or some other mechanism is active, the result is that when bending the paper wrapper, the enhanced elasticity of the layered or banded compartments reduces the likelihood that the layered or banded compartments will separate from the paper wrapper. Indicates. Moreover, the elasticity of the layered or banded compartments allows the layered or banded compartments to conform three-dimensionally with the underlying paper as the applied solution dries-thus shrinking in the banded areas is reduced and at the same time wrinkles between the banded areas and And / or wrinkles are also reduced. Thus, incorporating the antiwrinkle agent in the starch solution weakens the wrinkles described above.

Further advantages of the antiwrinkle agents described herein relate to the film-forming properties of the solution. More specifically, the incorporation of the antiwrinkle agent into the additive material appears to enhance the film-forming properties of the additive material with respect to the surface of the base web to which the additive material is applied. The enhanced film-forming properties are believed to enhance the IP performance of banded paper wrappers composed of additional materials. Moreover, the thin film-forming property sufficiently enhances the desired closing effect of the layer where a desired reduction in the permeability of the band region can be achieved with a single printing application of additional material, whereby the multi-pass application required in a solution free of anti-wrinkle agents Effectively removes it.

Some additional benefits have been found when 1,2 propylene glycol is used as an anti-wrinkle agent. Specifically, 1,2 propylene glycol can be effectively used when the 1,2 propylene glycol weight ratio to starch weight in the solution is about 100%. In contrast, glycerin can be effectively used when the glycerin weight ratio to starch weight in the solution is less than 40%, since the drying time for the starch-and-starch-plasticizer solution at this ratio becomes unacceptable. The difference in drying time may result from the difference between the boiling point of glycerine (290 ° C.) and the boiling point of 1,2 propylene glycol (187.3 ° C.) (difference of about 100 ° C.). For 1,2 fluoropropylene glycols, the boiling point is closer to that of the aqueous solvent than to the glycerin.

By the addition of an anti-wrinkle agent to the starch solution, the permeability of the band region is enhanced, i.e., the permeability is more formulated and lower than the permeability to the banded shape without the use of plasticizer. This phenomenon is important because it allows the required amount of starch solution to be applied or printed in a single printing step. Those skilled in the art will understand that complex printing steps have typically been required in the past to perform the necessary transparency reduction in banded areas. Of course, for other reasons it may still be desirable to continue the use of a multilayer print job.

For Table V, wrapper A is a split band having three compartments of about 2 mm each, with a total width of about 6 mm for the banded shaped area printed at an additional speed of various compartments from about 3.5x to about 5.5x. Contains an array An addition rate of 5.5x produces an additive material of from about 8 g / m ² to about 9 g / m ^{2 in} the basis dry weight, where the nominal basis weight of the wrapper is about 26.5 g / m ² . Lower addition rates can be expected to provide values that are proportionally adjusted relative to the weight of the additive material, measured on a dry weight basis. The widths of the banded areas and sections are typically measured in the longitudinal direction and have a 27 mm face (ie, the gap from the leading edge of the banded area to the leading edge of the next or subsequent banded area).

V

In Table V, the "banded region arrangement" simply represents the width of the banded portions seen in the direction in which the char is advanced in the tobacco rod. Thus, the 2.5-2-2.5 arrangement has a total width of the banded area of the first part of 2.5 mm, a total width of the banded area of the second part of 2 mm, and a total width of the banded area of the third part of the band. Means 2.5 mm. Here, the first part is first met with the advancing char of the tobacco rod, the second part is met with the advancing char, and the third part is finally met with the advancing char.

Table Vl-Items in Wrapping Paper A

Table VII-Items in Wrapping Paper C

Table VI-IX shows that banded regions of the composite compartments can be produced in a single pass printing operation at the application rates indicated in this table. In each of the wrappers A to D, the additive material preferably included an aqueous solution comprising starch, chalk or calcium carbonate, and 1,2 propylene glycol. Currently preferred mixtures for such aqueous solutions include starch, choke, and 1,2 propylene glycol, from about 100 wt% (relative to starch), from about 40 wt% to about 80 wt% (for choke), about 100 wt% Up to (in the case of 1,2 propylene glycol). Starch alone may range from about 20% to about 24% in an aqueous solution.

The inventors specify that some variation in the relative proportions of the additional materials may change when the aqueous solution is applied to the base web and dried. For example, when 1,2 propylene glycol was used as anti-wrinkle agent, it was observed that about 50% to about 60% of the propylene glycol added to the solution remained in the additive material when dried in the paper web. Some weight loss can also occur with other anti-wrinkle agents during the drying process. However, this weight loss was not observed for the starch and calcium carbonate components of the additive material during the drying process.

The compartment 26 of additional material can be defined as a C-shaped compartment, as shown (see FIG. 2), substantially continuous across the paper web, or when formed into a wrapper for tobacco rods (see FIG. 4). It may have one or more separations extending longitudinally, or may have several arch-shaped portions generally symmetrically positioned around the tobacco rod when viewed in cross section across the longitudinal axis 34 of the tobacco rod 22. (See FIG. 5).

In addition, the compartment 26 of the additional material of the paper wrapper 23 is generally measured in a direction parallel to the axis 34 of the tobacco rod 22, which does not normally exceed the width of the ring 26 ( w) into two or more substantially ring-shaped portions (see FIG. 3) spaced from each other along the axis 34. This spacing feature provides a "slit" to the band structure.

This also means that the compartment 26 of the paper wrapper 23, together with the patches 27 ′ of the adjacent compartment 26 arranged circumferentially from the patches of the other adjacent compartment 26, is around the tobacco rod 22. It may comprise a plurality of patches 27 (see FIG. 5) disposed circumferentially. In addition, patches 27 and 27 'are commonly assigned U. S. Patent No., which is hereby incorporated by reference in its entirety. As can be learned from 60 / 924,666 it can be arranged according to a predetermined pattern.

The compartment of additional material is preferably applied in a single layer 80 (see FIG. 6). It should be noted that the representation of the basic web cross section of FIG. 6 is schematic. The actual cross section of the base web is one slide through the myriad fibers forming the base web. In the case of cigarette paper wrappers, the thickness may be about 30 microns (ie, 30 × 10 ⁻⁶ meters or 30 μm). The additive material of 2 μm or less, and the actual thickness of the additive material, tends to penetrate and match the surface provided by the fibers of the base web. As a result, the material standing in the compartment of the additional material can be represented schematically in the shape of a box (as in FIGS. 6 and 7), but in fact is hardly visible to the naked eye. Finally, if multiple layers are used to form compartments of additional material, it will be understood that the resulting structure is nearly impossible to decompose into individual layers. Decomposition into separate or separate layers is more complicated when aqueous solutions are applied, since subsequent layers tend to wet the existing layer again and allow components such as choke to settle through the material of the previous layer. Become.

The application rate of the material in a preferred monolayer (see FIG. 6) may range from about 4x to about 6x. For this purpose, "x" is a nominal value commonly used in gravure printing to account for the relative quantity of material mounted, relative to the basic nominal application speed. In a basic web having a nominal Coresta value of about 33, it is believed that a current preferred application rate of about 5X would be suitable. In a basic web having a nominal Coresta value of about 60, it is currently believed that a preferred application rate of about 5.5X is suitable.

Although compartments of additional material are preferably applied in a single pass, application, or layer, the present disclosure also contemplates the application of the additional material in multiple application steps or layers (see FIG. 7). In an embodiment, after the first layer 80 is applied and dried on the surface of the base web in the first gravure printing station 43 (see FIG. 8), the second layer 82 of additional material (see FIG. 7) May be applied onto the paper wrapper, for example, in the second print station 45. If desired, a third or next layer 84 (see FIG. 7) may be applied at an additional print station, for example 46 (see FIG. 8). The second layer 82 is superimposed over the first layer 80 and can be aligned to span substantially the same space. Alternatively, the second layer 82 may cover only one or more portions of the first layer 80. The relative rates of application of the layers need not be the same and are preferably different. For example, one layer can be at least about 1.5 times to about 3 times the thickness of at least the other layer.

When "weight ratio" is used herein for the starch component of the starch solution, the "weight ratio" is the ratio of the weight of the additional material to the weight of the starch used to prepare the starch solution. Moreover, in this specification, reference to "X% starch solution" refers to an aqueous starch solution in which the starch weight is X% of the solution weight (eg, the weight of starch divided by the sum of the starch weight and the weight of the aqueous component).

When the word "about" is used herein with reference to a numeric value, its intention includes not only the numerical value but also a range and a tolerance of ± 5% of the exact numeric value associated with the word "about".

Those skilled in the art will understand that this specification describes a banded material composition of new, useful and obscure smoking articles, paper wrappers, and additional materials. Those skilled in the art will also appreciate that numerous modifications, variations, substitutions, and equivalents exist for the various aspects of the articles, papers, and / or compositions described in the detailed description of the invention. Accordingly, it is evident that all such alterations, modifications, substitutions and equivalents within the scope of this specification are included in the invention as defined by the appended claims.

Claims (25)

Smoking articles having preferred ignition propensity and self-extinguishing properties: A large amount of tobacco; And A paper wrapper that surrounds a large amount of tobacco and defines a tobacco rod having a pair of ends, the paper wrapper including one or more banded regions having a base web and reduced static burn rate between the ends of the tobacco rod; ; Wherein the at least one banded region comprises an anti-wrinkle agent. The smoking article of claim 1, wherein the anti-wrinkle agent is selected from the group consisting of glycerin and propylene glycol. The smoking article of claim 1, wherein the smoking article exhibits improved self-extinguishing performance characteristics as compared to an equivalent smoking article having one or more banded regions that do not include an anti-wrinkle agent. The smoking article of claim 1, wherein the at least one banded region comprises starch and the weight ratio of the antiwrinkle agent to starch in the material added to the at least one banded region ranges from about 10% to about 120%. . The smoking article according to claim 4, wherein the weight ratio of the anti-wrinkle agent to starch is about 30% to about 60%. The smoking article of claim 1, wherein the material added to the one or more banded regions comprises from about 40 wt% to about 100 wt% starch. The smoking article of claim 1, wherein the material added to the banded region comprises from about 40 wt% to less than about 60 wt% starch. The smoking article of claim 1, wherein said banded region further comprises starch and calcium carbonate. The method of claim 8 wherein: The weight ratio of the antiwrinkle agent to starch in the material added to the one or more banded regions ranges from about 0.1 to about 1.2; And And wherein the weight ratio of calcium carbonate to starch in the material added to the one or more banded regions is from about 0.4 to about 1.0. The method of claim 9 wherein: The weight ratio of anti-wrinkle agent to starch is about 0.3 to about 0.6; And A smoking article, wherein the weight ratio of calcium carbonate to starch is about 0.8. The smoking article according to claim 8, wherein the additional material used to form the banded region has a total solids content of about 15 to about 60 weight percent. The smoking article according to claim 8, wherein the additional material used to form the banded region has a total solids content of about 40% by weight. The smoking article of claim 1, wherein said banded region comprises one layer. The smoking article according to claim 13, wherein the first layer is located on a paper wrapper and the second layer is located on the first layer. The smoking article of claim 1, wherein the average ignition propensity is about 25% or less. The smoking article of claim 1, wherein the average self-extinguishing property at 0 ° is less than about 25%. A smoking article according to claim 1, wherein the banded area is applied to the paper wrapper by printing. 18. A smoking article according to claim 17, wherein the banded area is applied to the paper wrapper by gravure printing. Paper packaging for smoking articles with preferred ignition propensity and self-extinguishing properties: A base web of paper having a longitudinal direction and a transverse direction and comprising a plurality of banded regions extending transversely with a distance from each other in the longitudinal direction; Wherein the plurality of banded areas comprise an anti-wrinkle agent. 20. The paper wrapper of claim 19 wherein the plurality of banded regions comprise starch. 21. The paper wrapper of claim 20 wherein the plurality of banded regions comprises calcium carbonate. A composition for printing materials on a base web of paper comprising an anti-wrinkle agent. 23. The composition of claim 22, wherein the anti-wrinkle agent is selected from the group consisting of glycerin and propylene glycol. 23. The composition of claim 22, further comprising a component selected from the group consisting of starch and calcium carbonate. As a method of making banded paper: Establishing a supply of additional solution to the print station; And Passing the base web through the print station while repeatedly applying the solution to a portion of the base web at the print station; Establishing the feed comprises adding an anti-wrinkle agent to the addition solution.

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